Conference Agenda

Optimisation of Clay based Repository Concepts_from site selection to operations

Study on the construction of disposal scenarios and a tentative migration modelling of cesium for the final disposal of radioactive-ly contaminated waste outside of Fukushima Prefecture

Eriko Minari, Kazuo Yamada, Kazuto Endo

National Institute of Environmental Studies, Japan

Investigating the Effects of Small Organic Molecules on the Adsorption of Uranyl on Clay Minerals with Molecular Dynamics

Jakub Ličko, Andrey G. Kalinichev

SUBATECH (UMR 6457 – IMT Atlantique, Nantes Université, CNRS-IN2P3), France

Numerical investigation of pore characteristics in spherical and platelet particle beds

Otono Miura¹, Ryunosuke Oishi¹, Tsubasa Yagi², Shusaku Harada¹

1: Hokkaido University, Japan; 2: Radioactive Waste Management Funding and Research Center, Japan

Migration of caesium decreases with increasing compaction of MX-80 bentonite

Theresa Hennig¹, Sina Grossmann², Jens Mibus³, Luc R. Van Loon⁴, Martin A. Glaus⁴, Vinzenz Brendler⁵

1: GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Potsdam, Germany; 2: VKTA Radiation Protection, Analytics and Disposal Rossendorf Inc., Environmental and Radionuclide Analyses, Dresden, Germany; 3: Federal Office for the Safety of Nuclear Waste Management (BASE), Department A Supervision, Berlin, Germany; 4: Paul Scherrer Institut, Laboratory for Waste Management, Villigen PSI, Switzerland; 5: Helmholtz-Zentrum Dresden Rossendorf e.V., Institute of Resource Ecology, Dresden, Germany

Understanding the Effect of Indigenous Microorganisms in Bentonite on the Biocorrosion of Metal Canisters, for the Final Disposal of Nuclear waste (Under Relevant DGR Conditions)

Adam David Mumford¹, Marcos Martinez-Moreno², Cristina Povedano-Priego², Mar Morales-Hidalgo², Miguel Ruiz-Fresneda², Yon Ju-Nam¹, Mohamed L. Merroun², Jesus J. Ojeda¹

1: Swansea University, Department of Chemical Engineering, United Kingdom; 2: University of Granada, Department of Microbiology, Spain

Temperature Influence on Swelling Pressure of Ca-Bentonite up to 150 °C

Deuk-Hwan Lee, Gi-Jun Lee, Seeun Chang, Minhyeong Lee, Seok Yoon, Chnagsoo Lee, Dong-Keun Cho

Korea Advanced Energy Research Institute, Korea, Republic of (South Korea)

Implications of groundwater composition on the performance of ben-tonite components in nuclear waste disposal facilities

Han Ming Lai¹, Lidija Zdravkovic¹, David M. Potts¹, Matthew Kirby²

1: Imperial College London, United Kingdom; 2: Nuclear Waste Services, UK

Role of poromechanical couplings in gas fracturing around an excavation

Mohammad-Youssef FALLAH-SOLTANABAD¹, Amade POUYA¹, Laurent BROCHARD¹, Minh-ngoc VU², Christophe DE LESQUEN²

1: Navier Laboratory, Ecole des Ponts ParisTech, Gustave Eiffel University, CNRS, 77455 Marne la Vallée, France; 2: Andra R&D, 92290 Châtenay-Malabry, France

Gas Transport in the Barrier – Lessons learnt from BenVaSim-II, EURAD-GAS and DECOVALEX2023

Michael Pitz^1,2, Gesa Ziefle¹, Jobst Maßmann¹, Eike Radeisen^1,4, Norbert Grunwald^3,2, Olaf Kolditz^3,4, Thomas Nagel^2,3

1: Federal Institute for Geosciences and Natural Resources; 2: Technische Universität Bergakademie Freiberg; 3: Helmholtz Center for Environmental Research; 4: Technical University Dresden

An Assessment Strategy for the Evaluation of Radionuclide Migration from Potential Repositories in Claystone

Christoph Behrens, Merle Bjorge, Julia Dose, Marlene Gelleszun, Niklas Meindl, Florian Panitz, Shorash Miro, Alexander Renz, Robert Seydewitz, Wolfram Rühaak, Stephanie Zeunert, Phillip Kreye

Bundesgesellschaft für Endlagerung mbH, Eschenstraße 55, 31224 Peine, Germany

CIGEO project - Analysis of the effect of segmental lining joints on the tunnel mechanical behaviour during the operational phase and over the long term

Marco Camusso¹, Minh-Ngoc Vu²

1: ITASCA Consultants S.A.S., Lyon, France; 2: ANDRA, Châtenay-Malabry, France

Adapting disposal concepts to reflect emerging UK geologiccal environments

Matthew Edward Kirby, Simon Norris

Nuclear Waste Services, United Kingdom

New data on the compositional-structural characteristics of the Opalinuston Formation from Southern Germany: Facies-based investigations and mineralogical analyses

Tilo Kneuker¹, Thomas Mann¹, Reiner Dohrmann^1,2, Kristian Ufer¹, Jochen Erbacher¹, André Bornemann¹, Bernhard Schuck¹, Lukas Pollok¹

1: Federal Institute for Geosciences and Natural Resources, Hannover, Germany; 2: State Authority for Mining, Energy and Geology (LBEG), Hannover, Germany

Effects of ionic strength on cation exchange selectivities of Ca(II), Mg(II), K(I) for Na(I) in compacted and dispersed montmorillonite

Ryo Yasuda¹, Shingo Tanaka¹, Daisuke Hayashi¹, Hitoshi Owada¹, Tomoko Ishii³, Yukinobu Kimura²

1: Radioactive Waste Management Funding and Research Center, Japan; 2: Obayashi Corporation Co., Ltd.; 3: Taiheiyo Consultant Co., Ltd

Geochemical investigation of veins and evidence for paleo fluid flow in Opalinus Clay

Lukas Aschwanden¹, Nathan Looser², Martin Mazurek¹, Thomas Gimmi^1,3, Daniel Traber⁴

1: University of Bern, Switzerland; 2: ETH Zürich, Switzerland; 3: Paul Scherrer Institut, Villigen, Switzerland; 4: NAGRA, Wettingen, Switzerland

Comparison of the clay mineralogy of fault and host rocks in the Opalinus Clay, Switzerland

Jonas Strasser, Susanne Gier, Kurt Decker

University of Vienna, Austria

CO2 Long-term Periodic Injection Experiment (Mont Terri URL): Introduction to the in-situ experiment and results of the first phase

Martin Ziegler¹, David Jaeggi¹, Rolf Kipfer², Antonio Pio Rinaldi³, Anne Obermann³, Jonas Junker³, Hua Shao⁴, Markus Furche⁴

1: Federal Office of Topography, Mont Terri Underground Rock Laboratory, St. Ursanne, Switzerland; 2: Department Water Resources and Drinking Water, EAWAG, Dübendorf, Switzerland; 3: Swiss Seismological Service, ETH Zurich, Zurich, Switzerland; 4: Federal Institute for Geosciences and Natural Resources, Hannover, Germany

Extraction, Quantification and Isotopic Characterisation of Gases Dissolved in Porewater of Argillaceous Rocks - Method Comparison and Evaluation

Florian Eichinger¹, Laura Kennell², Niko Kampman³

1: Hydroisotop GmbH, Germany; 2: NWMO, Canada; 3: Nuclear Waste Services, UK

GeM-DB – A basis for planning surface exploration programs

Raphael Dlugosch, Thies Beilecke, Tilo Kneuker, Lukas Pollok, Lisa Richter, Nicole Schubarth-Engelschall, Ralf Semroch

Federal Institute for Geosciences and Natural Resources, Germany

Influence of Rescue Chambers on the Design of Geological Repositories in Clay

Felix Lehnen, Berit Rauscher

Brenk Systemplanung GmbH, Germany

MiniSandwich experiment – performance test in laboratory of a bentonite-based shaft sealing system

Christopher Rölke¹, Katja Emmerich², Eleanor Bakker², Hua Shao³

1: Institut für Gebirgsmechanik GmbH Leipzig (IfG), Germany; 2: Karlsruher Institut für Technologie (KIT), Germany; 3: Bundesanstalt für Geologie und Rohstoffe (BGR), Germany

Long term monitoring of physical and chemical parameters of a ce-mento-bentonitic filling material (CBFM) and of corrosion potential of a horizontal pipe made of carbon steel, submerged by the CBFM into a sealed cell of underground gallery

Ioannis IGNATIADIS¹, Yendoube Charles SANO MOYEME², Johan BERTRAND³, Stéphanie BETELU⁴

1: BRGM, France; 2: BRGM, France; 3: ANDRA, France; 4: BRGM, France

Multi-scale modelling of the Sandwich experiment in Mont Terri

Larissa Friedenberg, Matthias Hinze, Klaus Wieczorek

Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany

Study on the construction of disposal scenarios and a tentative migration modelling of cesium for the final disposal of radioactive-ly contaminated waste outside of Fukushima Prefecture

Eriko Minari, Kazuo Yamada, Kazuto Endo

National Institute of Environmental Studies, Japan

All‑solid‑state reference electrode based on lithium lanthanum tita-nium oxide (LLTO) for the long term monitoring of nuclear waste dis-posals

Djouhar AOUBIDA^1,3, quoc-nghi PHAM³, Stéphanie BETELU¹, Johan BERTRAND², Nita DRAGOE³, Ioannis IGNATIADIS¹

1: BRGM (French Geological Survey), Orleans, France; 2: ANDRA (French national radioactive waste management agency), Châtenay-Malabry, France; 3: ICMMO (Institute of Molecular Chemistry and Materials), Orsay, France

Direct Mineral Content Prediction from Drill Core Images via Transfer Learning

Romana Boiger¹, Sergey V. Churakov^1,2, Ignacio Ballester Llagaria^1,3, Georg Kosakowski¹, Raphael Wüst^4,5, Nikolaos I. Prasianakis¹

1: Paul Scherrer Institute, Switzerland; 2: University of Bern, Switzerland; 3: ETH Zürich, Switzerland; 4: Nagra, Switzerland; 5: James Cook University, Australia

OpenWorkFlow - Open-source synthesis-platform for safety in-vestigations in the site selection process

Olaf Kolditz^1,4, Christoph Lehmann¹, Thomas Nagel², Christoph Behrens³, Alexander Renz³, Phillip Kreye³, Wolfram Rühaak³

1: Helmholtz-Zentrum für Umweltforschung GmbH UFZ, Germany; 2: TU Bergakademie Freiberg; 3: BGE Bundesgesellschaft für Endlagerung mbH; 4: Dresden University of Technology

DEVELOPMENT AND USE OF THE THERMOCHIMIE DATABASE

Stéphane Brassinnes¹, Benoît Madé², Will Bower³

1: Belgian Agency for Radioactive Waste and Enriched Fissile Materials (ONDRAF/NIRAS); 2: Agence nationale pour la gestion des déchets radioactifs (Andra); 3: Nuclear Waste Services (NWS)

Investigating the Effects of Small Organic Molecules on the Adsorption of Uranyl on Clay Minerals with Molecular Dynamics

Jakub Ličko, Andrey G. Kalinichev

SUBATECH (UMR 6457 – IMT Atlantique, Nantes Université, CNRS-IN2P3), France

Numerical investigation of pore characteristics in spherical and platelet particle beds

Otono Miura¹, Ryunosuke Oishi¹, Tsubasa Yagi², Shusaku Harada¹

1: Hokkaido University, Japan; 2: Radioactive Waste Management Funding and Research Center, Japan

Influence of salinity gradients on the diffusion of water and ionic species in dual porosity clay samples

Emmanuel Tertre¹, Thomas Dabat¹, Jingyi Wang², Sebastien Savoye², Fabien Hubert¹, Baptiste Dazas¹, Christophe Tournassat^3,4, Eric Ferrage¹

1: Université de Poitiers/CNRS, UMR 7285 IC2MP, Equipe HydrASA, 5 rue Albert Turpain, Bât. B8, TSA - 51106, 86073 Poitiers cedex 9, France; 2: Université Paris-Saclay, CEA, Service d'Etude du Comportement des Radionucléides, 91191 Gif-sur Yvette, France; 3: ISTO, UMR 7327, Univ. Orleans, CNRS, BRGM, OSUC, F-45071 Orléans, France; 4: Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA

Diffusion experiment (36Cl, 3H) across concrete/claystone interface

Urs Mäder¹, Lukas Martin², Carmen Zwahlen³, Sandra Baur⁴, Christoph Vockenhuber⁵, Andreas Jenni³, Martin Heule⁴, Marcus Christl⁵, Mirjam Kiczka³, Josep Soler⁶

1: Rock-Water Consulting, Boll, Switzerland; 2: Nagra, Wettingen, Switzerland; 3: University of Bern, Switzerland; 4: Paul Scherrer Institut, Switzerland; 5: ETH Zuerich, Switzerland; 6: CSIC Barcelona, Spain

Long Term Safety studies at EDF with code_saturne

Jérôme BONELLE, Marc KHAM, Raphael LAMOUROUX

EDF, France

Interaction of groundwater in crystalline rock and a compacted bentonite buffer

Michael Kröhn, Klaus-Peter Kröhn

GRS gGmbH, Germany

Migration of caesium decreases with increasing compaction of MX-80 bentonite

Theresa Hennig¹, Sina Grossmann², Jens Mibus³, Luc R. Van Loon⁴, Martin A. Glaus⁴, Vinzenz Brendler⁵

1: GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Potsdam, Germany; 2: VKTA Radiation Protection, Analytics and Disposal Rossendorf Inc., Environmental and Radionuclide Analyses, Dresden, Germany; 3: Federal Office for the Safety of Nuclear Waste Management (BASE), Department A Supervision, Berlin, Germany; 4: Paul Scherrer Institut, Laboratory for Waste Management, Villigen PSI, Switzerland; 5: Helmholtz-Zentrum Dresden Rossendorf e.V., Institute of Resource Ecology, Dresden, Germany

Impact of temperature on the transfer of mobile tracers in the Toarcian clayrock at the Tournemire URL

Maïwenn Humbezi Desfeux¹, Jean-Michel Matray¹, Manuel Marcoux²

1: Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV/SPDR/LETIS, Fontenay-aux-Roses, F-92260, France; 2: Institut de Mécanique des Fluides de Toulouse, UMR 5502 CNRS/INP/UPS 31400 Toulouse, France

Diffusion of Np through Illite du Puy

Claudia Joseph^1,2, Bianca Schacherl¹, Tonya Vitova¹, Polina Lavrova¹, Theresa Hennig³, Michael Kühn^3,4

1: Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), Germany; 2: Bundesgesellschaft für Endlagerung, Germany; 3: GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Germany; 4: University of Potsdam, Institute of Geosciences, Germany

Optimizing Wellbore Sealing with Japanese Na-Bentonite: In-sights from Two Vertical Wells at Grimsel Test Site, Switzerland

Takanori Kunimaru¹, Raphael Schneeberger², Armin Pechstein², Stratis Vomvoris²

1: NUMO, Japan; 2: Nagra, Switzerland

Experimental and modelling study of the hydro-chemo-mechanical behaviour of sand bentonite mixtures in hyperalkaline conditions

Christophe IMBERT¹, Andrés IDIART², Sebastien SAVOYE¹, Wissem DRIDI¹, Marcelo LAVIÑA², Miquel DE LA IGLESIA², Nicolas MICHAU³, Benoit COCHEPIN³, Jean TALANDIER³

1: Paris-Saclay University, CEA, DRMP, 91191, Gif-sur-Yvette, France; 2: Amphos 21 Consulting S.L., Barcelona, Spain; 3: Andra, R&D Division, F-92298 Châtenay Malabry, France

Reactive Transport Modelling of Material Interface Evolution in the HLW Near-field

Georg Kosakowski¹, Lukas Martin²

1: Paul Scherrer Institut, Switzerland; 2: Nagra, Switzerland

Understanding the Effect of Indigenous Microorganisms in Bentonite on the Biocorrosion of Metal Canisters, for the Final Disposal of Nuclear waste (Under Relevant DGR Conditions)

Adam David Mumford¹, Marcos Martinez-Moreno², Cristina Povedano-Priego², Mar Morales-Hidalgo², Miguel Ruiz-Fresneda², Yon Ju-Nam¹, Mohamed L. Merroun², Jesus J. Ojeda¹

1: Swansea University, Department of Chemical Engineering, United Kingdom; 2: University of Granada, Department of Microbiology, Spain

Cation exchange parameters for Opalinus Clay and its confining units

Paul Wersin, Lukas Aschwanden, Mirjam Kiczka

University of Bern, Switzerland

Geochemical alteration in selected bentonites affected by thermal interaction with steel and saline solution hydration

Raúl Fernández, Carlos Mota-Heredia, Jaime Cuevas

Autonomous University of Madrid, Spain

Iron-bentonite interaction in a water-saturated low temperature environment: mineralogy and microstructure

María Jesús Turrero¹, Elena Torres¹, Pedro Luis Martín¹, Raúl Fernández², Ana Isabel Ruiz², Almudena Ortega², Antonio Garralón^1,2, Belén Notario³, Carlos Mota², Jaime Fernando Cuevas²

1: Ciemat, Madrid, Spain; 2: UAM, Madrid, Spain; 3: CENIEH, Burgos, Spain

Mineralogical evolution of COx claystone during in situ MCO experiment

Isabella Pignatelli¹, Nicolas Michau², Yannick Linard²

1: Université de Lorraine, Laboratoire CRPG, CNRS UMR 7358, 15 rue Notre-Dame des Pauvres, 54500, Vandœuvre-lès-Nancy, France; 2: Andra, Scientific & Technical Division, Waste, Radionuclides, Chemicals & Geochemistry Department, 1/7 rue Jean Monnet, F-92298 Châtenay-Malabry CEDEX, France

Anoxic corrosion of carbon steel in different cementitious media and high temperature conditions: comparison between laboratory test and in situ experiment results

Charles Wittebroodt¹, Jules Goethals², Bojan Zajec³, Valery Detilleux⁴, Laurent De Windt⁵

1: IRSN, France; 2: CEA, France; 3: ZAG, Slovenia; 4: Bel-V, Belgium; 5: Mines Paris, France

Redox buffering by iron-bearing clay minerals in the ferrous iron/smectite system

Harry J. L. Brooksbank², Anke Neumann^1,2

1: PSI Paul Scherrer Institut, Switzerland; 2: Newcastle University, UK

Modelling the reactive transport processes in unsaturated clay barriers – inclusion of capillary geochemistry

Shao-Jie Wu, Majid Sedighi, Andrey Jivkov

The University of Manchester, United Kingdom

Microbial ecology of engineered barrier components of a deep geological repository for used nuclear fuel

Rachel C. Beaver¹, Rhiannon Punch¹, Cailyn Perry¹, Claire S. Tully², Katja Engel¹, Melody A. Vachon¹, W. Jeffrey Binns³, Chang Seok Kim³, James J. Noël², Josh D. Neufeld¹

1: University of Waterloo, Waterloo, Canada; 2: Western University, London, Canada; 3: Nuclear Waste Management Organization, Toronto, Canada

Steel corrosion and reactive transport model in bentonite for predicting spent fuel disposal package lifetime

Milan Hokr¹, Lucie Baborová², Jan Šembera¹, Vratislav Žabka¹, Jan Stoulil³, Dušan Vopálka², Eva Bedrníková⁴, Petr Večerník⁴, David Dobrev⁴

1: Technical University of Liberec, Czech Republic; 2: Czech Technical University in Prague, Faculty of Nuclear Sciences and Physical Engineering, Czechia; 3: University of Chemistry and Technology Prague, Czechia; 4: ÚJV Řež, a.s., Czechia

Experimental study of swelling and permeability of a Bavarian bentonite, Friedland clay, and Opalinus clay at 35–150 °C

Artur Meleshyn, Matthias Hinze, Marvin Middelhoff

GRS gGmbH, Germany

A new experimental system for studying gas formation and release during laboratory rock core heating experiments

Christian Ostertag-Henning, Oliver Helten

Federal Institute for Geosciences and Natural Resources (BGR), Germany

Temperature Influence on Swelling Pressure of Ca-Bentonite up to 150 °C

Deuk-Hwan Lee, Gi-Jun Lee, Seeun Chang, Minhyeong Lee, Seok Yoon, Chnagsoo Lee, Dong-Keun Cho

Korea Advanced Energy Research Institute, Korea, Republic of (South Korea)

The CHENILLE experiment: Coupled beHaviour undErstaNdIng of fauLts: from the Laboratory to the fiEld

Rüdiger Giese¹, Audrey Bonnelye², Pierre Dick³, Carolin Böse¹, Stefan Lueth¹, Ben Norden¹, Katrin Plenkers⁴, Roman Esefelder⁵, Christian Cunow¹, Sven Fuchs¹

1: German Research Centre for Geosciences GFZ, Germany; 2: Université de Lorraine, Georessources, Ecole des Mines de Nancy, France; 3: Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV/SPDR/LETIS, Fontenay-aux-Roses, F-92260, France; 4: 4 Gesellschaft für Material­prüfung und Geophysik (GmuG), Bad Nauheim, Germany; 5: Friedrich-Schiller-Universität, Institut für Geowissenschaften, Jena, Germany

COCONS: A numerical tool for Thermo-Hydro-Mecanical dimensioning of a deep geological repository High Level Waste area

Florian Escoffier, Sylvie Granet, Geoffroy Mélot, Isabelle Rupp

EDF R&D, France

HotBENT at the Grimsel Test Site - Early THMC evolution of a buffer at up to 200°C

Florian Kober¹, Raphael Schneeberger¹, Stefan Finsterle², Stratis Vomvoris¹, Bill Lanyon³

1: Nagra, Switzerland; 2: Finsterle GeoConsulting, LLC, Kensington, CA, United States; 3: Fracture Systems Ltd., St. Ives, Great Britain

Thermo-hydraulic characterization of bentonite in partially saturated conditions at two temperature levels

Eleonora Crisci¹, Raphael Schneeberger², Alexandros Papafotiou², Florian Kober²

1: Nesol Numerical Engineering Solutions, Lausanne, Switzerland; 2: Nagra, National Cooperative for the Disposal of Radioactive Waste, Wettingen, Switzerland

Identification of key parameters in coupled thermal-hydraulic analysis model for unsaturated Kunigel V1 bentonite

Yusaku Takubo¹, Yusuke Takayama², Keisuke Ishida¹

1: Nuclear Waste Management Organization of Japan (NUMO), Japan; 2: Japan Atomic Energy Agency (JAEA), Japan

Thermally Aged (165oC-200oC) Bentonite Performance

Sirpa Kumpulainen¹, Jari Martikainen¹, Teemu Laurila¹, Olivier Leupin², Florian Kober²

1: MITTA, Finland; 2: Nagra, Switzerland

Swelling, outflow, and permeability characteristics of bentonite in NaCl solutions of various concentrations

Masanori Kohno, Shun Kohdo, Tsuyoshi Nishimura

Tottori University, Japan

Modelling air convection in a segmented buffer

Peter Eriksson

SKB, Sweden

Mineralogical and geotechnical characterization of two German bentonites from Westerwald and Bavaria

Ali Asaad¹, Antonia Nitsch², Wiebke Baille², Katja Emmerich¹

1: Institute of Concrete Structures and Building Materials (IMB, MPA, CMM), Karlsruhe Institute of Tech-nology (KIT), Karlsruhe, Germany; 2: Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Department of Civil and Environmental Engineering, Ruhr-University Bochum, Bochum, Germany

Implications of groundwater composition on the performance of ben-tonite components in nuclear waste disposal facilities

Han Ming Lai¹, Lidija Zdravkovic¹, David M. Potts¹, Matthew Kirby²

1: Imperial College London, United Kingdom; 2: Nuclear Waste Services, UK

The alteration of bentonite in contact with carbon steel

Šárka Šachlová¹, Petr Bezdička², Michaela Matulová³, Vlastislav Kašpar¹, Karol Kočan¹, Zbyněk Veselka⁴, Petr Večerník¹

1: ÚIJV Řež, a.s., Radioactive waste and decommissioning; 2: Institute of Inorganic Chemistry of the Czech Academy of Sciences; 3: Radioactive Waste Repository Authority; 4: ÚJV Řež, a. s., Integrity and Technical Engineering,

Numerical Modelling of Volume Change Behaviour in Bentonite Buffer Exposed to Thermo-Hydraulic Gradients

Pavan Kumar Bhukya¹, Nandini Adla¹, Wang Xuerui², Dali Naidu Arnepalli¹

1: Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, India; 2: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Braunschweig, Germany

Shear resistance of bentonite with non-uniformity distribution in suction

Tomoyoshi Nishimura¹, Takayuki Motoshima², Sachie Iso²

1: Department of Civil Engineering, Ashikaga University, Tochigi, Japan; 2: Nuclear Facilities Division, Taisei Corporation, Tokyo, Japan

Verification of Von Mises and modified Cam clay models’ imple-mentation using analytical solutions. Triaxial tests simulation.

Jordi Alcoverro¹, Xavier Pintado², Juha Kuutti³, Ville Heino⁴

1: Technical University of Catalonia, Spain; 2: Mitta Engineering Oy, Finland; 3: VTT, Finland; 4: Posiva Oy, Finland

Reactive transport models of the interactions of corrosion products and unsaturated FEBEX bentonite in laboratory and in situ tests

Javier Samper, Alba Mon, Luis Montenegro

Universidad de A Coruña, Spain

The impact of NaNO3 on the diffusion of dissolved gases in clay

Elke Jacops¹, Chloé Roonacker², Hannes Claes³, Lander Frederickx¹, Anneleen Vanleeuw¹, Phung Quoc Tri¹, Jerry Peprah Owusu^4,6, Jon Harrington⁵, Andy Wiseall^5,7, Christophe Bruggeman¹

1: SCK CEN, Belgium; 2: ULg, Belgium; 3: KU Leuven, Belgium; 4: PSI, Switzerland; 5: BGS, United Kingdom; 6: University of Bern, Switzerland; 7: NWS, United Kingdom

Modelling of mock-up tests for bentonite seals

Sonja Kaiser¹, Aqeel Afzal Chaudhry¹, Martin Hofmann¹, Thomas Nagel^1,2

1: TU Bergakademie Freiberg, Freiberg, Germany; 2: Freiberg Center for Water Research - ZeWaF, Freiberg, Germany

A study on buffer-material erosion under constant water head condition

Kenji Ishii¹, Akihiro Matsumoto¹, Ichizo Kobayashi¹, Hirohito Kikuchi², Daisuke Hayashi²

1: Kajima Corporation, Tokyo, Japan; 2: Radioactive Waste Management Funding and Research Center, Tokyo, Japan

Filling efficiency of mono-sized pellets for sealing boreholes for a wide range of borehole-to-pellet diameter ratios

Ayaka Sakaki¹, Toshihiro Sakaki²

1: International Christian University, Japan; 2: ESE Consulting LLC, Japan

Gas in radwaste deep geological repositories: example from Bure URL in clay rich formation

Rémi DE LA VAISSIERE, Jean TALANDIER, Christophe DE LESQUEN, Gilles ARMAND

ANDRA, France

Particle size evolution of granular bentonite on wetting and loading

Hao Zeng¹, Laura Gonzalez-Blanco^2,1, Enrique Romero^1,2

1: Universitat Politècnica de Catalunya (UPC), Barcelona, Spain; 2: International Centre for Numerical Methods in Engineering (CIMNE), Barcelona, Spain

Role of poromechanical couplings in gas fracturing around an excavation

Mohammad-Youssef FALLAH-SOLTANABAD¹, Amade POUYA¹, Laurent BROCHARD¹, Minh-ngoc VU², Christophe DE LESQUEN²

1: Navier Laboratory, Ecole des Ponts ParisTech, Gustave Eiffel University, CNRS, 77455 Marne la Vallée, France; 2: Andra R&D, 92290 Châtenay-Malabry, France

Impact of Heterogeneity in 3D THM-G Modelling of Laboratory to Field-Scale Tests in the Context of Nuclear Waste Repository Design

Erdem Toprak, Sebastia Olivella

CIMNE, Spain

Assessment of the effect of heterogeneities on the hydromechanically coupled behavior of two German bentonites

Wiebke Baille¹, Antonia Nitsch¹, Torsten Wichtmann¹, Ali Asaad², Katja Emmerich²

1: Ruhr-Universität Bochum, Germany; 2: Karlsruhe Institute of Technology (KIT), Germany

Design of HLW emplacement drifts in the Swiss deep geological repository in squeezing conditions

Julia Leuthold¹, Linard Cantieni¹, Peter Kirchhofer²

1: Nagra, Switzerland; 2: AFRY Schweiz AG, Switzerland

Influence of geological and geotechnical boundary conditions on the host rock behavior – experiences from the twin niches in Mont Terri

Gesa Ziefle¹, Tuanny Cajuhi¹, Stephan Costabel¹, Antoine Fourriere¹, Markus Furche¹, Jana Gerowski¹, Bastian Graupner², Jürgen Hesser¹, David Jaeggi³, Kyra Jantschik⁴, Tilo Kneuker¹, Olaf Kolditz^5,6, Herbert Kunz¹, Jobst Maßmann¹, Andreas Möri³, Christian Ostertag-Henning¹, Marc Wengler⁷

1: Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), Germany; 2: Eidgenössisches Nuklearsicherheitsinspektorat (ENSI), Switzerland; 3: Bundesamt für Landestopografie (swisstopo), Switzerland; 4: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS), Germany; 5: Helmholtz-Zentrum für Umweltforschung GmbH (UFZ), Germany; 6: Technische Universität Dresden (TU Dresden), Germany; 7: Bundesgesellschaft für Endlagerung (BGE), Germany

Non-isothermal behavior of excavation damaged zone around deep radioactive waste disposal

Saeed Tourchi¹, Arash Lavasan¹, Antonio Gens²

1: University of Luxembourg; 2: Barcelona Tech (UPC)

Pore-water pressure response and permeability evolution around excavations in claystone beyond the EDZ

Álvaro D. Suárez¹, Miguel A. Mánica¹, Eric Simo^2,4, Sandra E. Perales³, Thomas Nagel⁴

1: Institute of Engineering, National Autonomous University of Mexico, Mexico City, Mexico; 2: BGE TECHNOLOGY GmbH, Peine, Germany; 3: Mextypsa, Mexico City, Mexico; 4: Geotechnical Institute, TU Bergakademie Freiberg, Germany

Advances on investigation of chemical effects on the hydro-mechanical behavior of compacted bentonite

Weimin YE, Puhuai LU, Qiong Wang, Yonggui Chen

Tongji University, China, People's Republic of

Five years of evolution in the mineralogy and chemistry of Milos bentonite caused by a saline (Na-Ca-Cl) hydration front against a heat source

Jaime Fernando Cuevas¹, María Victoria Villar², Andrés Idiart³, Ana Melón², Ana Isabel Ruiz¹, Almudena Ortega¹, Heino Ville⁴

1: UAM, Madrid, Spain; 2: CIEMAT, Madrid, Spain; 3: Amphos 21 Consulting, S.L.; 4: POSIVA Oy, Finland

Kinetics of rehydration in smectites and bentonites

Karolina Rybka¹, Artur Kuligiewicz¹, Stephan Kaufhold², Reiner Dohrman^2,3, Arkadiusz Derkowski¹

1: Institute of Geological Sciences, Polish Academy of Sciences, Senacka 1, 31-002, Krakow, Poland; 2: BGR, Bundesanstalt für Geowissenschaften und Rohstoffe, Stilleweg 2, D-30655 Hannover, Germany; 3: LBEG, Landesamt für Bergbau, Energie und Geologie, Stilleweg 2, D-30655 Hannover, Germany

Cementation effect on one-dimensional swelling deformation property of bentonite ore

Daichi Ito, Hailong Wang, Hideo Komine

Waseda University, Japan

In-situ radionuclides diffusion experiment in a thermal gradient in the sandy facies of Opalinus Clay

Guillaume Pochet¹, David Jaeggi², Frank Heberling³, Bastian Graupner⁴, Will Bower⁵, Guido Deissmann⁶, Myriam Agnel⁷, Fabiano Magri⁸, Agnes Vinsot⁷, Christoph Borkel⁸, Carl Dietl⁸, Frederic Bernier¹, Cedric Barroo¹, Maryna Surkova¹, Yuankai Yang⁶, Sanduni Ratnayake³, Vanessa Montoya⁹

1: FANC, Brussels, Belgium; 2: Swisstopo, Wabern, Switzerland; 3: KIT, Karlsruhe, Germany; 4: ENSI, Brugg, Switzerland; 5: NWS, Cumbria, UK; 6: Forschungszentrum Juelich, Juelich, Germany; 7: ANDRA, Bure, France; 8: BASE, Berlin, Germany; 9: SCK CEN, Mol, Belgium

A batch and diffusion investigation of the mobility of selenide into the Callovo-oxfordian argillite

Sebastien SAVOYE¹, Nathalie COREAU¹, Serge LEFEVRE¹, Emilie THORY¹, Benoit MADE², Jean-Charles ROBINET², Romain DAGNELIE¹

1: Paris Saclay University, CEA, France; 2: Andra, France

DIFFUSION AND RETENTION OF DIVALENT TRANSITION METAL TRACERS IN COMPACTED ILLITE CONVERTED TO DIFFERENT CATIONIC FORMS

Dimitra Zerva^1,2, Martin Glaus¹, Sergey Churakov^1,2

1: Paul Scherrer Institute; 2: Univerisity of Bern

Predictive modelling of radionuclide sorption on Boom Clay

Delphine Durce¹, Lian Wang¹, Liesbeth Van Laer¹, Norbert Maes¹, Stephane Brassinnes²

1: SCK CEN, Belgium; 2: ONDRAF/NIRAS, Belgium

BGR research on claystone in the Mont Terri rock laboratory

Jürgen Hesser, Gesa Ziefle

Federal Institute for Geosciences and Natural Resources, Germany

Nagra’s post-closure safety case for the general license application

Olivier X Leupin¹, Ashley Brown¹, Valentyn Bykov¹, Nikitas Diomidis¹, Typhaine Guillemot¹, Priska Hunkeler¹, Hoda Javanmard¹, Thomas Kämpfer², Xiaoshuo Li¹, Paul Marschall¹, Lukas Martin¹, Alexandros Papafotiou¹, Martin Schoenball¹, Paul Smith³, Raphael Wüst¹

1: Nagra, Switzerland; 2: Eastern Switzerland University of Applied Sciences; Oberseestrasse 10, 8640 Rap-perswil, Switzerland; 3: SAM-LTD, Switzerland

Demonstration testing program on backfill system for the post-closure phase of the French radioactive waste disposal

Youssef Fawaz¹, Rémi de La Vaissière¹, Jean Talandier², Jad Zghondi¹, Gilles Armand¹

1: Andra, Meuse/Haute-Marne Underground Research Laboratory, Bure, France; 2: Andra, Châtenay-Malabry, France

Design of concrete-based segmental liners for a potential German HLW/SF repository in claystone

Philipp Herold¹, Ajmal Gafoor¹, Eric Simo¹, David Seidel¹, Andreas Hucke², Sven Bock², Benedikt Wöhrl², Axel Studeny²

1: BGE TECHNOLOGY GmbH, Germany; 2: DMT GmbH & Co. KG

Excavation of the Konrad 2 shaft landing station in a clay and marl claystone: numerical modelling of excavation and support measures

Mirko Polster¹, Lothar te Kamp², Michael Breustedt³, Stephan Gehne³

1: BGE Technology, Germany; 2: ITASCA, Gelsenkirchen, Germany; 3: BGE, Germany

Hydrogeological model of northern Switzerland

Jens Becker¹, Jaouhar Kerrou², Ellen Milnes², Olivier Masset², Laurent Tacher³, Nicolas Roy¹, Daniel Traber¹, Pierre Perrochet²

1: Nagra, Switzerland; 2: CHYN, Uni Neuchatel, Switzerland; 3: Terreplus, Switzerland

Geotechnical clay core characterisation for deep geological disposal of radioactive waste in the Netherlands

Vidushi Toshniwal¹, Ties de Jong¹, Hemmo Abels¹, Wout Broere¹, Ana Maria Fernández², Michael A. Hicks¹, Dirk Munsterman³, Erika Neeft⁴, Philip J. Vardon¹, Anne-Catherine Dieudonné¹

1: Delft University of Technology, The Netherlands; 2: CIEMAT, Madrid, Spain; 3: TNO, Geological Survey of the Netherlands, Utrecht, The Netherlands; 4: COVRA, Nieuwdorp, The Netherlands

Calibrated clay formation characterization using multi-scale data, clustering and stochastic approaches

Serge Marnat¹, Jens Becker²

1: Ad Terra Group, Geneva, Switzerland; 2: National Cooperative for the Disposal of Radioactive Waste (Nagra), Wettingen, Switzerland

Characterizing claystone with NMR logs as repository host rock.

Joachim Strobel

BGE, Germany

Self-Sealing of the Mont Terri Opalinus Clay Main Fault following a Mesoscale Activation Experiment

Yves Guglielmi¹, Christophe Nussbaum², Frédéric Cappa³, Tanner Shadoan⁴, Jonathan Ajo-Franklin⁴, Florian Soom¹, Bill Lanyon⁵, Paul Cook¹, Chet Hopp¹, Verónica Rodríguez Tribaldos¹, Michelle Robertson¹, Todd Wood¹, Senecio Schefer², Jens Birkholzer¹

1: Energy Geosciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, USA; 2: Swiss Geological Survey, swisstopo, Wabern, Switzerland; 3: Université Côte d’Azur, CNRS, Observatoire de la Côte d’Azur, IRD, Géoazur, Sophia Antipolis, France; 4: Rice University, Dept. of Earth, Environmental, and Planetary Science, Houston, TX, USA; 5: Fracture Systems Ltd, Tregurrian, Ayr, St. Ives, Cornwall, UK

Preliminary study of iron-clay interactions in clay samples col-lected in the Kiirunavaara iron mine, Kiruna, northern Sweden

Satoru Suzuki¹, Tatsuya Fujimura², Kanya Kimura², Ryosuke Kikuchi², Takahiro Goto¹, Ulf B Andersson³, Tsubasa Otake², Tsutomu Sato²

1: Science and Technology Department, NUMO, Japan; 2: Hokkaido University, Japan; 3: LKAB, Kiruna, Sweden

The microbial community in bentonites B27 and GMZ and its in-fluence on cast iron corrosion

Sean Ting-Shyang Wei, Sindy Kluge, Paul Chekhonin, Vanessa Dykas, Cornelia Kaden, Nicole Matschiavelli

Helmholtz-Zentrum Dresden-Rossendorf, Germany

Modelling the evolution of a bentonite-cementitious backfilling grout for HLW disposal cell

Kevins Rhino¹, Nicolas Marty¹, Sylvain Grangeon¹, Nicolas Maubec¹, Catherine Lerouge¹, Esra Orucoglu¹, Mathieu Debure¹, Sebastien Jego¹, Nicolas Michau², Xavier Bourbon², Christelle Martin²

1: BRGM, F-45060 Orléans, France; 2: Andra, 1/7 Rue Jean Monnet, 92298, Châtenay-Malabry CEDEX, France

Evolution upon contact with water of a bentonite-cement backfilling grout: insights from laboratory and in situ mineralogical characteriza-tions and from geochemical modelling

Sylvain Grangeon¹, Mathieu Debure¹, Valerie Montouillout², Erik Elkaïm³, Catherine Lerouge¹, Nicolas Maubec¹, Nicolas Michau⁴, Xavier Bourbon⁴, Christelle Martin⁴, Benoit Cochepin⁴, Nicolas Marty¹

1: BRGM, F-45060 Orléans, France; 2: Conditions Extrêmes et Matériaux : Haute Température et Irradiation (CEMHTI), CNRS UPR 3079, 1D avenue de la Recherche Scientifique 45071 Orléans, France; 3: Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin 91190, France; 4: Andra, 1/7 Rue Jean Monnet, 92298, Châtenay-Malabry CEDEX, France

In-situ long-term interactions between different concrete formulas and COx claystone in a deep disposal context

Catherine Lerouge¹, Nicolas Maubec¹, Guillaume Wille¹, Christine Flehoc¹, Catherine Guerrot¹, Stéphane Gaboreau¹, Yannick Linard², Francis Claret¹

1: BRGM, France; 2: ANDRA, France

Porewater extraction techniques from clay-rich sedimentary rocks

Martin Mazurek¹, Paul Wersin¹, Florian Eichinger², Adrian Bath³, Tom Al⁴, Ian D. Clark⁴, Laura Kennell-Morrison⁵, Niko Kampman⁶, Daniel Traber⁷

1: University of Bern, Switzerland; 2: Hydroisotop GmbH, Schweitenkirchen, Germany; 3: Intellisci, Willoughby on the Wolds, UK; 4: University of Ottawa, Ottawa, Canada; 5: Nuclear Waste Management Organization, Toronto, Canada; 6: Nuclear Waste Services, Didcot, UK; 7: Nagra, Wettingen, Switzerland

Elucidating the fate of hydrogen by means of deuterium gas injections: an in-situ experiment in Opalinus Clay

Mélanie Lundy¹, Christian Ostertag-Henning², Paul Königer², Stefan Wechner³, Yanick Lettry⁴, Myriam Agnel¹, Agnès Vinsot¹

1: Andra, France; 2: BGR, Germany; 3: Hydroisotop GmbH, Germany; 4: Solexperts AG, Switzerland

Effect of nitrate on in situ Se(VI) reduction in Opalinus Clay

Nele Bleyen¹, Katrien Hendrix¹, Kristel Mijnendonckx¹, Catherine Lerouge², Veerle Van Gompel¹, Jef Mathijs¹, Elie Valcke¹

1: SCK CEN, Belgium; 2: BRGM, France

High-resolution, integrated, chemically consistent sorption and diffusion data for radionuclide transport models: Examples from Switzerland for site characterisation

Raphael Wuest¹, Martin Glaus², Dmitrii Kulik², Luc Van Loon³, Maria Marques Fernandes², Dan Miron², Olha Marinich², Jens Becker¹, Bart Baeyens³, Xiaoshuo Li¹

1: Nagra, Switzerland; 2: PSI Switzerland; 3: CWL Solutions, Switzerland

Understanding bentonite buffer under high temperature: modeling and tests

Unravelling the depositional model of the Opalinus Clay using grain-size variability

Géraldine Nicole Zimmerli¹, Stephan Wohlwend², Gaudenz Deplazes³, Thomas Mann⁴, Anneleen Foubert¹

1: Department of Geosciences, University of Fribourg, Fribourg, Switzerland; 2: Institute of Geological Sciences, University of Bern, Bern, Switzerland; 3: Nagra (National Cooperative for the Disposal of Radioactive Waste), Wettingen, Switzerland; 4: Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany

3D Hydro-Mechanical modelling to support the design of the REG experiment in the Callovo-Oxfordian Claystone

Gilles Corman¹, Abhishek Rawat¹, Jean Talandier², Rémi de La Vaissiere², Youssef Fawaz², Frédéric Collin¹

1: University of Liège, Belgium; 2: Andra, France

Differentiation of fractures and rock mass deformation in clay rocks by Machine Learning

Rushan Wang^1,2, Andrea Manconi^1,2, Martin Ziegler³

1: WSL Institute for Snow and Avalanche Research SLF; 2: Climate Change, Extremes and Natural Hazards in Alpine Regions Research Centre CERC; 3: Swiss Federal Office of Topography (swisstopo)

Mechanochemical activation of synthetic Na-n-micas – applications in retention of high-level radioactive waste

Aníbal López-Marín¹, Rosa Martín-Rodríguez^1,2, Fernando Aguado^2,3, Ana C. Perdigón^1,2

1: QUIPRE Department, University of Cantabria, Avda. Los Castros, 46, 39005, Santander, Spain.; 2: Nanomedicine Group, IDIVAL, Avda. Cardenal Herrera Oria s/n, 39011, Santander, Spain.; 3: CITIMAC Department, Universidad de Cantabria, Avda. Los Castros, 48, 39005, Santander, Spain.

Development of a separation method for Am-, Sr-, Pu- and U-isotopes in concrete using extraction chromatography

Gloria Steckholzer, Claudia Landstetter, Krystle Elbers, Rainer Kadan

AGES- Austrian Agency for Health and Food Safety, Austria

Neptunium migration in Opalinus Clay - one experiment with multiple numerical geochemical solutions

Theresa Hennig¹, Madlen Stockmann², Claudia Joseph², Vinzenz Brendler³, Tobias Reich⁴, Michael Kühn^1,5

1: GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Potsdam, Germany; 2: Bundesgesellschaft für Endlagerung mbH (BGE), Peine, Germany; 3: Helmholtz Zentrum Dresden Rossendorf e.V., Institute of Resource Ecology, Dresden, Germany; 4: Johannes Gutenberg Universität Mainz, Department of Chemistry, Mainz, Germany; 5: University of Potsdam, Institute of Geosciences, Potsdam, Germany

Harnessing microbial processes consuming hydrogen in radioac-tive waste repositories

Camille Rolland¹, Olivier Leupin², Rizlan Bernier-Latmani¹

1: École Polytechnique Fédérale de Lausanne (EPFL) Environmental Microbiology Labo-ratory, CH-1015 Lausanne, Switzerland; 2: National Cooperative for the Disposal of Radioactive Waste CH-5430, Wettingen, Switzerland

Current status of the in-situ interaction experiment at the Bukov URF

Anna Golubko¹, Jan Smutek¹, Jiří Svoboda²

1: Radioactive Waste Repository Authority - SÚRAO, Czech Republic; 2: Czech Technical University in Prague, Czech Republic

3D Modelling of Coupled Hydro-Mechanical Processes in Fractured Opalinus Clay Shale

Muhammad Raharsya Andiva¹, Qinghua Lei¹, Martin Ziegler²

1: Department of Earth Sciences, Uppsala University, Uppsala, Sweden; 2: Federal Office of Topography (swisstopo), Mont Terri URL, St-Ursanne, Switzerland

Microstructural Examination of Gas Migration Influence in Heterogeneous Pellet/Powder Bentonite Mixtures Using X-ray Computed Micro-Tomography

Mohammed ZAIDI, Nadia MOKNI, Magdalena DYMITROWSKA, Kui LIU

Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-ENV/SPDR/LETIS, Fontenay-aux-Roses, F-92260, France

Suitability investigations of Lithuanian clay formations for the deep geological repository of radioactive wastes

Roma Kanopiene

Lithuanian geological survey, Lithuania

Modelling of unsaturated homogenisation with an enhanced bentonite material model using COMSOL Multiphysics

Alex Spetz, Ola Kristensson, Daniel Malmberg

Clay Technology, Sweden

CEC as quality proof for smectitic phases in lower Cretaceous clay rocks – illite-smectite ± pure smectite?

Reiner Dohrmann^1,2, Kristian Ufer¹, Tilo Kneuker¹, Jochen Erbacher^1,2, André Bornemann¹

1: BGR, Germany; 2: LBEG, Germany

Multi-scale 2D and 3D characterisation for enhanced understanding of UK lower strength sedimentary rocks.

Kevin G Taylor, Lin Ma, Holly Mills, Xin Zhong, Ke Wang

University of Manchester, United Kingdom

Unravelling the depositional model of the Opalinus Clay using grain-size variability

Géraldine Nicole Zimmerli¹, Stephan Wohlwend², Gaudenz Deplazes³, Thomas Mann⁴, Anneleen Foubert¹

1: Department of Geosciences, University of Fribourg, Fribourg, Switzerland; 2: Institute of Geological Sciences, University of Bern, Bern, Switzerland; 3: Nagra (National Cooperative for the Disposal of Radioactive Waste), Wettingen, Switzerland; 4: Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany

Influence of texture on the chloride accessible porosity fraction explored by SEM and µCT data

Carmen Andrea Zwahlen¹, Thomas Gimmi^1,2, Andreas Jenni¹, Martin Mazurek¹, Daniel Traber³, Raphael Wüst³

1: University of Bern, Switzerland; 2: Paul Scherrer Institut, Switzerland; 3: Nagra, Switzerland

Exploring the dynamics of aquifer - aquitard systems: new insights from 81Kr model ages

Daniel Traber¹, Nicolas Roy¹, Emiliano Stopelli¹, Michael Heidinger², Florian Eichinger², Christoph Wanner³, Thomas Gimmi³, H. Niklaus Waber⁴, Jin Ma³

1: Nagra, Wettingen, Switzerland; 2: Hydroisotop GmbH, Schweitenkirchen, Germany; 3: University of Bern, Bern, Switzerland; 4: WaterGeoChem Consulting, Bern, Switzerland

Mont Terri BIM — Project overview and technical realisation

Martin Ziegler¹, Senecio Schefer¹, Stefan Volken²

1: Swiss Federal Office of Topography (swisstopo), St-Ursanne, Switzerland; 2: Swiss Federal Office of Topography (swisstopo), Wabern, Switzerland

Geochemistry and pore water in the lower confining units of the Opalinus Clay at Mont Terri Rock Laboratory (Switzerland)

Ana María Fernández¹, Catherine Lerouge², Francisco Javier León¹, Paula Nieto¹, David Jaeggi³, Michael Kühn⁴

1: CIEMAT, Spain; 2: BRGM, France; 3: Swisstopo, Switzeland; 4: Helmholtz-Zentrum Potsdam, Germany

Underground storage of high-grade radioactive waste in mudrock: In search of the Holy Grail

Laurence Warr, Georg Grathoff

University of Greifswald, Germany

Development and Emplacement of an Annular Grout Envisaged for HLW Emplacement Drifts to Study Long-Term Interaction with Opalinus Clay

Lukas Martin¹, Wolfgang Seidl², Sebastian Kernbichl², Nicole Wieser², René Bolliger³, Julien Bizzozero³

1: Nagra, Switzerland; 2: Master Builders Solutions Deutschland GmbH, Trostberg, Germany; 3: Master Builders Solutions Schweiz AG, Holderbank, Switzerland

Monitoring fluid movement and swelling pressure development in semi-technical scale Sandwich sealing system experiments

Martin Hofmann¹, Eleanor Bakker², Franz Königer³, Thomas Nagel¹, Rainer Schuhmann³, Katja Emmerich²

1: TU Bergakademie Freiberg, Germany; 2: Karlsruhe Institute of Technology, Germany; 3: ISU mbH, Germany

3D Hydro-Mechanical modelling to support the design of the REG experiment in the Callovo-Oxfordian Claystone

Gilles Corman¹, Abhishek Rawat¹, Jean Talandier², Rémi de La Vaissiere², Youssef Fawaz², Frédéric Collin¹

1: University of Liège, Belgium; 2: Andra, France

Development of Boron-Enhanced Metakaolin-Based Geopolymers for the Immobilisation of Radioactive Debris with the potential of Neutron Absorption

Xiaobo Niu, Yogarajah Elakneswaran, Ryosuke Kikuchi

Hokkaido University, Japan

Performance of MoxOy pH sensor prepared by thermal oxidation for the long term monitoring of nuclear waste disposals

Djouhar AOUBIDA^1,3, Stéphanie BETELU¹, Johan BERTRAND², quoc-nghi PHAM³, Nita DRAGOE³, Ioannis IGNATIADIS¹

1: BRGM (French Geological Survey), Orleans, France; 2: ANDRA (French national radioactive waste management agency), Châtenay-Malabry, France; 3: ICMMO (Institute of Molecular Chemistry and Materials), Orsay, France

Cation exchange capacity measurement for bentonite-cement reactions in a nuclear waste disposal - what are we really measuring?

Arkadiusz Derkowski¹, Adam Zięba¹, Reiner Dohrmann^2,3, Stephan Kaufhold³

1: Institute of Geological Sciences, Polish Academy of Sciences, Krakow, Poland; 2: tate Authority for Mining, Energy and Geology (LBEG), Hannover, Germany; 3: Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany

Influence of microstructure and pore saturation in measuring corro-sion rates of a carbon steel API 5L X65 in contact with cement grout in future nuclear waste disposal program

Yendoube Charles SANO MOYEME¹, Stéphanie BETELU¹, Johan BERTRAND², Stéphane GABOREAU¹, Karine GROENEN-SERRANO³

1: BRGM, France; 2: ANDRA, France; 3: LGC, France

Differentiation of fractures and rock mass deformation in clay rocks by Machine Learning

Rushan Wang^1,2, Andrea Manconi^1,2, Martin Ziegler³

1: WSL Institute for Snow and Avalanche Research SLF; 2: Climate Change, Extremes and Natural Hazards in Alpine Regions Research Centre CERC; 3: Swiss Federal Office of Topography (swisstopo)

Large-scale reactive transport simulations of uranium migration in Opalinus Clay accelerated by means of surrogate models

Marco De Lucia¹, Max Lübke², Theresa Hennig¹, Bettina Schnor²

1: GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Potsdam, Germany; 2: University of Potsdam, Institute of Computer Science, Potsdam, Germany

Measurement of pore water density in a bentonite using decalin

Hailong Wang

Waseda University, Japan

Development of test specimens for evaluating permeability measurements of tight rocks

Carlo Dietl

Federal Office for the Safety of Nuclear Waste Management (BASE), Germany

CP1 and Tribicarb-3D: unique long term and large scale in situ migration tests in Boom Clay at the HADES Underground Research Laboratory

Marc Aertsens¹, Eef Weetjens¹, Joan Govaerts¹, Norbert Maes¹, Stéphane Brassinnes²

1: SCK CEN, Belgium; 2: ONDRAF/NIRAS, Belgium

EFFECT OF REDOX STATE ON THE REDOX SENSITIVE ELEMENT RETENTION BY APTIAN SANDS

Esra Orucoglu¹, Sylvain Grangeon¹, Myriam Agnel², Benoît Madé³, Mathieu Debure¹

1: BRGM, Orléans, France; 2: ANDRA, Centre de Meuse/Haute-Marne, Bure, France; 3: ANDRA, R&D Division, Châtenay-Malabry, France

Mechanochemical activation of synthetic Na-n-micas – applications in retention of high-level radioactive waste

Aníbal López-Marín¹, Rosa Martín-Rodríguez^1,2, Fernando Aguado^2,3, Ana C. Perdigón^1,2

1: QUIPRE Department, University of Cantabria, Avda. Los Castros, 46, 39005, Santander, Spain.; 2: Nanomedicine Group, IDIVAL, Avda. Cardenal Herrera Oria s/n, 39011, Santander, Spain.; 3: CITIMAC Department, Universidad de Cantabria, Avda. Los Castros, 48, 39005, Santander, Spain.

Development of a separation method for Am-, Sr-, Pu- and U-isotopes in concrete using extraction chromatography

Gloria Steckholzer, Claudia Landstetter, Krystle Elbers, Rainer Kadan

AGES- Austrian Agency for Health and Food Safety, Austria

Migration behaviour of Ra-226 in the sandy facies of Opalinus Clay

Naila Ait-Mouheb¹, Victor Vinograd Vinograd¹, Martina Klinkenberg¹, Jenna Poonoosamy¹, Guido Deissmann¹, Luc R. Van Loon², Dirk Bosbach¹

1: Institute of Energy and Climate Research – Nuclear Waste Management (IEK-6), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany; 2: Laboratory for Waste Management, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland

Donnan equilibrium in compacted bentonite

Magnus Hedström¹, Ya-Wen Hsiao²

1: Clay Technology, Sweden; 2: Hartree Centre, STFC Daresbury Laboratory, Daresbury WA4 4AD, UK

Neptunium migration in Opalinus Clay - one experiment with multiple numerical geochemical solutions

Theresa Hennig¹, Madlen Stockmann², Claudia Joseph², Vinzenz Brendler³, Tobias Reich⁴, Michael Kühn^1,5

1: GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Potsdam, Germany; 2: Bundesgesellschaft für Endlagerung mbH (BGE), Peine, Germany; 3: Helmholtz Zentrum Dresden Rossendorf e.V., Institute of Resource Ecology, Dresden, Germany; 4: Johannes Gutenberg Universität Mainz, Department of Chemistry, Mainz, Germany; 5: University of Potsdam, Institute of Geosciences, Potsdam, Germany

Effective diffusivity prediction by considering multivariable regression and rock properties

Nikolaos Prasianakis¹, Romana Boiger¹, Georg Kosakowski¹, Raphael Wüst², Sergey Churakov^1,3

1: Laboratory for Waste Management, Paul Scherrer Institute, CH-5232 Villigen, Switzerland; 2: Nagra, Wettingen, Switzerland; 3: University of Bern, Institute of Geological Sciences, CH-3012 Bern, Switzerland

Successful gas tests at the GAs permeable Seal Test (GAST) - Highlights and lessons learned (Grimsel Test Site, CH)

Emiliano Stopelli¹, Thomas Spillmann¹, Bill Lanyon², Rémi de La Vaissière³, Jean Talandier³, Jeremy Chen⁴, Simon Norris⁵, Stratis Vomvoris¹, Irina Gaus¹, Florian Kober¹

1: Nagra, Switzerland; 2: Fracture Systems Ltd, United Kingdom; 3: ANDRA, France; 4: NWMO, Canada; 5: NWS, United Kingdom

Harnessing microbial processes consuming hydrogen in radioac-tive waste repositories

Camille Rolland¹, Olivier Leupin², Rizlan Bernier-Latmani¹

1: École Polytechnique Fédérale de Lausanne (EPFL) Environmental Microbiology Labo-ratory, CH-1015 Lausanne, Switzerland; 2: National Cooperative for the Disposal of Radioactive Waste CH-5430, Wettingen, Switzerland

Geochemical processes in a repository with clay barriers at high saline conditions

Claudia Joseph

Bundesgesellschaft für Endlagerung, Germany

Cement-Bentonite Interaction with Different Cement Materials at Elevated Temperatures 2: Modeling

Sohtaro ANRAKU¹, Ryohei KAWAKITA¹, Yuji HANAMACHI², Seiichiro MITSUI¹, Hiroshi SASAMOTO¹, Morihiro MIHARA¹

1: Japan Atomic Energy Agency (JAEA), Japan; 2: QJ Science Ltd., Japan

Comparison of different iron/bentonite exhibition tests and effect of the type of exchangeable cation on corrosion products

Stephan Kaufhold¹, Kristian Ufer¹, Reiner Dohrmann², Franz Renz³, Rene Lucka³, Maximilian Kilic³

1: BGR, Germany; 2: LBEG; 3: LUH

Sulfide Transport Through MX-80 Bentonite Under Various Geochemical Conditions

Magdalena Krol¹, Farhana Chowdhury¹, Sifat Papry¹, Md Abullah Asad¹, Pulin Mondal¹, Tarek Rashwan², Ian Molnar³, Mehran Behazin⁴, Peter Keech⁴

1: Department of Civil Engineering, Lassonde School of Engineering, York University, Toronto, Canada; 2: Department of Engineering and Innovation, The Open University (UK), Milton Keynes, England, United Kingdom; 3: School of Geosciences, University of Edinburgh, Edinburgh, Scotland, United Kingdom; 4: Nuclear Waste Management Organization, Toronto, ON, Canada

Concrete-clay interaction – a systematic review and modelling study

Marcelo Laviña¹, Andrés Idiart¹, Olga Riba¹, Fidel Grandia¹, Nicolas Michau², Xavier Bourbon², Benoit Cochepin²

1: Amphos 21 Consulting SL, Spain; 2: Andra, France

Studying the reactive transport of CO2 in Opalinus Clay with experimental and numerical analyses

Shuang Chen¹, Christian Ostertag-Henning¹, Vinay Kumar¹, Haibing Shao², Gesa Ziefle¹, Jobst Maßmann¹

1: Federal Institute for Geosciences and Natural Resources, BGR, Germany; 2: Department of Environmental Informatics, Helmholtz Centre for Environmental Research - UFZ, Leipzig, Germany

Exchangeable and soluble ion populations in semi-technical scale Sandwich sealing system experiments

Eleanor Bakker¹, Martin Hofmann², Thomas Nagel², Franz Königer³, Rainer Schuhmann³, Katja Emmerich¹

1: Institut für Massivbau und Baustofftechnologie (IMB/MPA/CMM), Karlsruhe Institute of Technology, Karlsruhe, Germany; 2: Institut für Geotechnik, TU Bergakademie Freiberg, Germany; 3: Ingenieur-Gesellschaft für Sensorik in der Umwelttechnik mbH (ISU), Karlsruhe, Germany

Delving into Bentonite Sedimentation Dynamics

Macarena Leal Olloqui¹, Daniel Svensson¹, Heikki Laitinen¹, Kenji Ishii², Patrik Sellin¹

1: SKB (Svensk Kärnbränslehantering AB), Oskarshamn, Sweden; 2: Kajima Corporation, Tokyo, Japan

Leaching kinetics of metakaolin in alkaline solution

Ryosuke Kikuchi, Xiaobo Niu, Yogarajah Elakneswaran

Hokkaido University, Japan

Reactive transport model of the long-term geochemical evolution in the near field of a HLW repository at the disposal cell scale: sensitivi-ties, variants and model simplifications

Javier Samper, Alba Mon, Luis Montenegro

Universidad de A Coruña, Spain

MINFF: A new classical forcefield for (clay-)minerals

Michael Holmboe

Umeå University, Sweden

Five-year laboratory tests of thermo-hydro-mechanical-chemical evolution of compacted bentonite: an experimental and modelling study

María Victoria Villar¹, Andrés Idiart², Emilie Coene², Jaime Cuevas³, Ana María Melón¹, Ana Isabel Ruiz³, Almudena Ortega³, Rubén Iglesias¹, Ville Heino⁴

1: CIEMAT, Spain; 2: Amphos 21 Consulting S.L., Spain; 3: UAM, Spain; 4: POSIVA, Finland

Deriving a Method for Host Rock specific Temperature Compatibility: Clay Rock

Kim-Marisa Mayer, Oliver Czaikowski, Bernd Förster, Matthias Hinze, Artur Meleshyn, Marvin Middelhoff, André Rübel, Klaus Wieczorek, Jens Wolf

Gesellschaft für Anlagen- und Reaktorsicherheit, Germany

Influence of temperature on the self-sealing of fractures in the Callovo-Oxfordian claystone

Mensan AGBOLI, Dragan GRGIC, Mohamed MOUMNI

University of Lorraine-CNRS, France

Conclusions on the post-yield behaviour of Opalinus claystone from multistage triaxial tests

Eleni Gerolymatou¹, Martin Kracht², Maximiliano Vergara³

1: TU Clausthal, Germany; 2: gbm Gesellschaft für Baugeologie und -meßtechnik mbH - Baugrundinstitut, Ettlingen, Germany; 3: Skava Consulting, Salzburg, Austria

Effect of pore water salinity on the tensile strength of Boom Clay

Ties de Jong, Bhini Chandan Malagar, Philip J. Vardon, Anne-Catherine Dieudonné

Delft University of Technology, Delft, The Netherlands

THM-Modelling of the ALC1605 in situ heating experiment in Cal-lovo-Oxfordian clay formation

Eric Simo^1,2, David Seidel¹, Thomas Nagel², Alexandru Tatomir⁵, Miguel Mánica⁴, Jörg Buchwald³, Dmitri Naumov³

1: BGE TECHNOLOGY GmbH, Peine, Germany; 2: Geotechnical Institute, TU Bergakademie Freiberg, Freiberg, Germany; 3: Helmholtz Centre for Environmental Research – UFZ, Leipzig, Germany; 4: Institute of Engineering, National Autonomous University of Mexico, Mexico City, Mexico; 5: BGE, Peine, Germany

Open-source implementation of a transversely isotropic elasto-visco-plastic damage model for clay shales in MFront and OpenGeoSys

Mehran Ghasabeh¹, Kavan Khaledi², Bastian Graupner³, Florian Amann^2,4, Thomas Nagel¹

1: Chair of Soil Mechanics and Foundation Engineering, Geotechnical Institute, TU Bergakademie Freiberg, Germany; 2: Fraunhofer Research Institution for Energy Infrastructure and Geothermal Systems IEG, Competence Center Geomechanics and Georisks, Aachen, Germany; 3: Swiss Federal Nuclear Safety Inspectorate (ENSI), Brugg, Switzerland; 4: Chair of Engineering Geology and Hydrogeology, RWTH Aachen, Germany

Numerical simulation of bentonite saturation at different temperatures

Larissa Friedenberg, Artur Meleshyn, Matthias Hinze

Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany

Temperature history effect on swelling pressure of Kunigel-V1 bentonite cured in confined condition

Kunlin RUAN

Waseda University, Japan

Evolution of gases in an unsaturated bentonite buffer

Mattias Åkesson, Heikki Laitinen, Patrik Sellin

SKB, Sweden

Changes in swelling and hydrological characteristics of compacted bentonite by heating at 200 °C

Yasutaka Watanabe¹, Ema Yoshikawa¹, Misato Shimbashi¹, Shingo Yokoyama¹, Takahiro Goto², Yoichi Yamamoto²

1: Central Research Institute of Electric Power Industry, Japan; 2: Nuclear Waste Management Organization of Japan, Japan

Current status of the in-situ interaction experiment at the Bukov URF

Anna Golubko¹, Jan Smutek¹, Jiří Svoboda²

1: Radioactive Waste Repository Authority - SÚRAO, Czech Republic; 2: Czech Technical University in Prague, Czech Republic

Sampling, Measurements and Analysis of the Clay Barriers in the Prototype Repository at Äspö HRL

Magnus Kronberg¹, Patrik Sellin¹, Daniel Svensson¹, Fredrik Vahlund¹, Torbjörn Sandén²

1: SKB, Swedish Nuclear Fuel and Waste Management Company; 2: Clay Technology

Investigating thermal coupling in a bentonite buffer

Stamatina Alexandropoulou¹, Lidija Zdravkovic¹, David Potts¹, Matthew Kirby², Simon Norris²

1: Imperial College London, United Kingdom; 2: Nuclear Waste Services, United Kingdom

Research into the Impact of Non-homogeneity on the Integrity of Bentonite Materials

Markéta Kučerová, Jiří Svoboda

Czech Technical University in Prague, Czech Republic

TH-Modelling for the in-situ HotBENT experiment at the Grimsel Test Site

Victoria Burlaka¹, Eric Simo^1,2, Tymofiy Gerasimov¹, David Seidel¹, Thomas Nagel², Christoph Lehmann³, Jörg Buchwald³, Dmitry Naumov³, Alexandru Tatomir⁴

1: BGE TECHNOLOGY GmbH, Germany; 2: Geotechnical Institute, TU Bergakademie Freiberg; 3: Helmholtz Centre for Environmental Research – UFZ; 4: BGE mbH, Federal Company for Radioactive Waste Disposal

Influence of sand mixture on gas pressure for bentonite

Tomoyoshi Nishimura

Ashikaga University, Japan

Changing of axial strains in creep performance for bentonite-sand mixture

Tomoyoshi Nishimura

Ashikaga University, Japan

Cation exchange simulation in Wyoming-type bentonite considering mechanical issues

Xavier Pintado¹, Rubén López-Vizcaíno², Ángel Yustres², Vicente Navarro², Laura Asensio², Sirpa Kumpulainen¹, Mika Niskanen³

1: Mitta Engineering Oy, Finland; 2: Universidad de Castilla-La Mancha, Spain; 3: Posiva Oy, Finland

Benchmarking of Double-Structure Models for the Numerical Simulation of Swelling Clays

Christian B. Silbermann¹, Matthias Hinze², Larissa Friedenberg², Philipp Schädle³, Markus Knauth⁴, Thomas Nagel¹

1: Geotechnical Institute, TU Bergakademie Freiberg, Germany; 2: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Braunschweig, Germany; 3: Swiss Federal Nuclear Safety Inspectorate (ENSI), Brugg, Switzerland; 4: Institut für Gebirgsmechanik GmbH, Leipzig, Germany

3D Modelling of Coupled Hydro-Mechanical Processes in Fractured Opalinus Clay Shale

Muhammad Raharsya Andiva¹, Qinghua Lei¹, Martin Ziegler²

1: Department of Earth Sciences, Uppsala University, Uppsala, Sweden; 2: Federal Office of Topography (swisstopo), Mont Terri URL, St-Ursanne, Switzerland

Impact of desaturation on the diffusion of gases in clay-based samples

Elke Jacops¹, Aadithya Gowrishankar^1,2, Norbert Maes^1,2, Pieter Verboven², Hans Janssen²

1: SCK CEN, Belgium; 2: KU Leuven, Belgium

Young’s modulus in claystones – adding complexity, reducing uncertainty

Sandra Schumacher, Werner Gräsle

Federal Institute for Geosciences and Natural Resources, Germany

Gas breakthrough simulation using bimodal porosity and mul-tiscale approach

Eike Radeisen^1,3, Hua Shao¹, Jürgen Hesser¹, Michael Pitz^1,4, Wenqing Wang², Olaf Kolditz^2,3

1: Federal Institute for Geosciences and Natural Resources (BGR), Germany; 2: Helmholtz Center for Environmental Research (UFZ), Germany; 3: Dresden University of Technology (TUD), Germany; 4: Technische Universität Bergakademie Freiberg (TUBAF), Germany

Development of a two-phase hysteretic model accounting for water and gas entry pressure for evaluating hysteretic hydrodynamic properties of clay-based materials in a deep geological repository for radioactive waste

Zakaria Saâdi

Institut de Radioprotection et de Sûreté Nucléaire (IRSN), France

Testing device for the visualisation of gas-driven cracks in clays

Joaquín Liaudat, Philip J. Vardon, Michael A. Hicks, Anne-Catherine Dieudonné

Delft University of Technology, The Netherlands

Erosion of compacted bentonite at elevated temperature

Majid Sedighi, Ziheng Wang, Linhau He, Huaxiang Yan, Mojgan Hadi Mosleh, Andrey Jivkov

The University of Manchester, United Kingdom

Observations and Quantification of Gas Flow in Sand-Bentonite Mixtures using Analogue Tests

Elliot James Muir Bird, Robert Cuss, Phil Neep

British Geological Survey, United Kingdom

FE-G: 10 years of gas dynamics observations at the Full-Scale Emplacement experiment (Opalinus Clay, Mont Terri, CH)

Emiliano Stopelli¹, Typhaine Guillemot¹, Myriam Agnel², Scott Briggs³, Fraser King⁴, Rolf Kipfer⁵, Simon Norris⁶, Nikitas Diomidis¹, Irina Gaus¹, Raphael Schneeberger¹

1: Nagra, Switzerland; 2: ANDRA, France; 3: NWMO, Canada; 4: ICC Ltd, Canada; 5: Eawag, Switzerland; 6: NWS, United Kingdom

14 years long Gas Experiment in borehole PAC1011 at ANDRA’s Un-derground Research Laboratory: Modelling the injection and transport of an Argon/Helium gas mixture in the Callovo-Oxfordian Claystone under in situ conditions

Nicolas Barret¹, Jean Croisé², Agnès Vinsot³, Myriam Agnel³, Rémi de La Vaissière³

1: INTERA, France; 2: INTERA, Switzerland; 3: ANDRA, France

Which porosity domains in clay-rich rocks are sampled by squeezing and advective displacement tests?

Mirjam Kiczka¹, Martin Mazurek¹, Andreas Jenni¹, Carmen Zwahlen¹, Lukas Aschwanden¹, Urs Mäder², Daniel Traber³

1: University of Bern, Switzerland; 2: Rock Water Consulting, Boll, Switzerland; 3: Nagra, Wetting, Switzerland

Oxygen isotope exchange between groundwater and calcite unravels million-year long hydrogeochemical evolution of a deep sedimentary aquifer

Christoph Wanner¹, Lukas Aschwanden¹, Mirjam Kiczka¹, Daniel Traber²

1: University of Bern, Switzerland; 2: NAGRA

Ab initio MD modelling of Ni2+, Zn2+, and Lu3+ cation adsorption on saponite edge surfaces

Vasyl Stotskyi^1,2, Fulvio Di Lorenzo^1,2, Maria Marques Fernandes¹, Matthias Krack¹, Andreas C. Scheinost^3,4, Martine Lanson⁵, Bruno Lanson⁵, Sergey V. Churakov^1,2

1: Paul Scherrer institute, Switzerland; 2: University of Bern; 3: 3 Helmholtz-Zentrum Dresden-Rosendorf (HZDR), Insitute of Resource Ecology; 4: The Rossendorf Beamline (ROBL), European Synchrotron Radiation Fascility (ESRF); 5: Univ. Grenoble Alpes, Univ. Savoie Mont Blanc, CNRS, IRD, Univ. Gustave Eiffel, ISTerre

A XAS study on the effect of ionizing radiation on the redox state of the structural iron in Bentonite clay

Nathan Lavauzelle¹, Mats Jonsson², Michael Holmboe¹

1: Umeå University, Sweden; 2: KTH, Sweden

Dismantling of the Mock-Up-Josef in-situ experiment after 10 years of operation – Comprehensive analysis of the bentonite barrier

Radek Vašíček¹, Šárka Šachlová², Jana Steinová³, Irena Hanusová⁴, Michaela Matulová⁵, Jiří Svoboda¹, Markéta Kučerová¹, Kateřina Černochová¹, Vlastislav Kašpar², Milan Zuna², Petr Večerník², Karol Kočan², Kateřina Černá⁴, Miroslava Mecová⁵

1: Czech Technical University in Prague, Faculty of Civil Engineering, Czech Republic; 2: ÚJV Řež, a. s., Radioactive waste and decommissioning, Husinec Řež, Czech Republic; 3: Technical University of Liberec, Institute for Nanomaterials, Advanced Technologies and Innovations, Czech Republic; 4: National Radiation Protection Institute (SÚRO), Prague, Czech Republic; 5: Radioactive Waste Repository Authority, Prague (SÚRAO), Czech Republic

The LOT S2 and A3 experiments at Äspö hard rock laboratory, Sweden – impact on bentonite performance after 20 years of heat-ing at 90 and 130°C

Daniel Svensson¹, Terese Bladström¹, Torbjörn Sandén², Patrik Sellin¹

1: Department of Research and Safety Assessment, Swedish Nuclear Fuel and Waste Management Co (SKB), Äspö Hard Rock Laboratory; 2: Clay Technology AB, Lund, Sweden.

THM modelling for HotBENT experiment using the water retention curve assumed by Bayesian inference

Shin Sato¹, Tomoyuki Shimura¹, Florian Kober²

1: Obayashi corporation, Japan; 2: Nagra, Switzerland

Elastic-viscoplastic modelling of the PRACLAY large-scale in situ heater test

Guillaume Flood-Page¹, Arnaud Dizier¹, Temenuga Georgieva¹, Mieke De Craen¹, Séverine Levasseur²

1: EURIDICE, Mol, Belgium; 2: ONDRAF/NIRAS, Brussels, Belgium

The International DECOVALEX Initiative - Building Confidence Via Model Comparison

Jens Birkholzer¹, Alex Bond², LianGe Zheng¹

1: Lawrence Berkeley National Laboratory, United States of America; 2: Quintessa Ltd., United Kingdom

Numerical modelling of heating induced cracking process by phase-field method considering thermo-hydromechanical coupling

Zhan YU¹, Jianfu SHAO¹, Minh-Ngoc VU²

1: University of Lille, France; 2: Andra, France

Implementation of a temperature-dependent constitutive model for argillaceous hard soils – weak rocks in MFront

Miguel A. Mánica¹, Eric Simo^2,4,5, Philipp Herold², Thomas Helfer³, Thomas Nagel⁴, Alexandru Tatomir⁵

1: Institute of Engineering, National Autonomous University of Mexico, Mexico City, Mexico; 2: BGE TECHNOLOGY GmbH, Peine, Germany; 3: CEA, DES, IRESNE, DEC, Cadarache, France; 4: Geotechnical Institute, TU Bergakademie Freiberg, Germany; 5: BGE, Peine, Germany

Outcome of a THM modelling benchmark on the effect of heating on clay formations

Christophe de Lesquen¹, Arnaud Dizier², Carlos Plúa¹, Gilles Armand¹, Eric Simo³

1: Andra, France; 2: EURIDICE, Belgium; 3: BGE, Germany

Profiles of natural tracers in porewater of a Mesozoic rock sequence in northern Switzerland

Thomas Gimmi^1,2, Paul Wersin¹, Lukas Aschwanden¹, Jin Ma¹, H. Niklaus Waber³, Martin Mazurek¹, Carmen Zwahlen¹, Christoph Wanner¹, Daniel Traber⁴

1: University of Bern, Bern, Switzerland; 2: Paul Scherrer Institut, Villigen, Switzerland; 3: WaterGeoChem Consulting, Bern, Switzerland; 4: NAGRA, Wettingen, Switzerland

Quantifying the evolution and transport of helium in porewater across the Mesozoic sedimentary sequence in northern Switzerland

Daniel Rufer¹, Jin Ma¹, Christoph Wanner¹, H. Niklaus Waber², Daniel Traber³

1: University of Bern, Switzerland; 2: WaterGeochem Consulting, Bern, Switzerland; 3: Nagra, Wettingen, Switzerland

Transport characteristics and barrier quality of a 134 m thick Opalinus Clay formation in southern Germany obtained from its porewater noble gas profile

Johanna Lippmann-Pipke¹, Samuel Niedermann², Karsten Osenbrück¹, Hua Shao¹, Daniel Rufer³, Thomas Mann¹

1: Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany; 2: German Research Centre for Geosciences (GFZ), Potsdam, Germany; 3: University of Bern, Bern, Switzerland

Multiscale experimental comparison of water diffusion by neutron tomography in a porous clay medium partially water-saturated

Lucas Désert^1,2,3, Sébastien Savoye³, Emmanuel Tertre¹, Alessandro Tengattini⁴, Arnaud Mazurier¹, Baptiste Dazas¹, Laurent Michot⁵, Pierre Henocq², Christophe Tournassat⁶, Eric Ferrage¹

1: Université de Poitiers, IC2MP, France; 2: Andra, France; 3: CEA, France; 4: ILL, France; 5: Sorbonne Université, Phénix, France; 6: ISTO, France

Streamlined modelling approach for transport of natural organic matter linked transport of radionuclides in Boom Clay

Norbert Maes¹, Joan Govaerts¹, Stéphane Brassinnes²

1: SCK CEN, Belgium; 2: ONDRAF/NIRAS, Belgium

Homogenisation in small-scale swelling tests with different water inflow rates

Ann Dueck¹, Daniel Malmberg¹, Patrik Sellin²

1: Clay Technology Lund AB, Sweden; 2: Svensk Kärnbränslehantering AB (SKB), Sweden

Cross-scale assessment of the hydromechanically coupled behavior of two German bentonites

Antonia Nitsch¹, Ali Asaad², Katja Emmerich², Torsten Wichtmann¹, Wiebke Baille¹

1: Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Department of Civil and Environmental Engineering, Ruhr-University Bochum, Bochum, Germany; 2: Institute of Concrete Structures and Building Materials (IMB/MPA/CMM), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

Thermo-hydro-mechanical modelling of bentonite using a double-porous hypoplastic bentonite model in OpenGeoSys/MFront: implementation, verification and validation

Tymofiy Gerasimov¹, Eric Simo^1,2, Thomas Nagel², Christoph Lehmann³, David Masin⁴, Tomas Krejci⁵, Jaroslav Kruis⁵, Thomas Helfer⁶, Alexandru Tatomir⁷

1: BGE TECHNOLOGY GmbH, Germany; 2: TU Bergakademie Freiberg, Germany; 3: Helmholtz Centre for Environmental Research – UFZ, Germany; 4: Charles University, Czech Republic; 5: Czech Technical University in Prague, Czech Republic; 6: CEA, DES, IRESNE, DEC, France; 7: BGE mbH, Federal Company for Radioactive Waste Disposal, Germany

Modelling the Full Scale Heater Experiment: Results of the international Benchmark Project DECOVALEX

Bastian Johannes Graupner¹, Kate Thatcher², Rebecca Newson², Michael Pitz³, Jan Thiedau³, Sonja Kaiser⁴, Thomas Nagel⁴, Luca Urpi⁵, Peng-Zhi Pan⁶, Wenbo Hou⁶, Larissa Friedenberg⁷, Taehyun Kim⁸, Chan-Hee Park⁹, Changsoo Lee⁸, Jonny Rutqvist¹⁰, Ruiping Guo¹¹, Teklu Hadgu¹², Edward Matteo¹²

1: Swiss Federal Nuclear Safety Inspectorate (ENSI), Brugg, Switzerland; 2: Quintessa Ltd, Warrington, UK; 3: Federal Institute for Geosciences and Natural Resources (BGR), Hanover, Germany; 4: Technische Universität Bergakademie Freiberg, Germany; 5: CSD, Aarau, Switzerland; 6: Chinese Academy of Sciences; 7: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Braunschweig, Germany; 8: Korea Atomic Energy Research Institute (KAERI), Daejeon, Korea; 9: Korea Institute of Geoscience and Mineral Resources (KIGAM), Daejeon, Korea; 10: Lawrence Berkeley National Laboratory (LBNL), Berkeley, California, USA; 11: Nuclear Waste Management Organization NWMO, Canada; 12: Sandia National Laboratories, USA

Hierarchical benchmarking of Richards-based thermo-hydro-mechanical coupled models for repositories of high-level radioactive waste

Jörg Buchwald^1,2, Wenqing Wang¹, Norbert Grunwald¹, Thomas Nagel², Olaf Kolditz¹

1: Helmholtz Centre for Environmental Research (UFZ), Leipzig, Germany; 2: Technische Universität Bergakademie Freiberg - TABAF, Freiberg, Germany

Performance assessment modeling at the repository and component level for the Swiss deep geological repository

Dominik Zbinden¹, Ursula Lengler¹, Keurfon Luu¹, Babak Shabani², Chao Li¹, Alexandros Papafotiou³, Paul Marschall³

1: INTERA Inc. Swiss Branch, Wettingen, Switzerland; 2: INTERA Inc., Bloomington, IN, USA; 3: Nagra, Wettingen, Switzerland

Post-closure evolution of voids in geological disposal facility vaults and implications for containment

Sam Parsons¹, Simon Norris¹, Javier Corral², David Holton³

1: Nuclear Waste Services; 2: Jacobs; 3: MCM Environmental Services Ltd

Uncertainty quantification of the elasto-viscoplastic behavior of COx claystone and long-term stability assessment of the drift’s concrete liner

Duc Phi DO¹, Minh Ngoc VU², Dashnor HOXHA¹, Gilles ARMAND²

1: Univ Orléans, Univ Tours, INSA CVL, Lamé, EA 7494, France; 2: Andra, 92298 Chatenay-Malabry, France

Comparing uncertainty quantification methods in the context of safety analyses for high-level nuclear waste disposal systems

Merle Marie Bjorge^1,2, Aqeel Afzal Chaudhry², Kata Kurgyis², Wolfram Rühaak^1,3, Thomas Nagel^2,4

1: Bundesgesellschaft für Endlagerung mbH (BGE), Peine, Germany; 2: Geotechnical Institute, Technische Universität Bergakademie Freiberg, Freiberg, Germany; 3: Technische Universität Darmstadt, Department of Geothermal Science and Technology, Darmstadt, Germany; 4: Freiberg Center for Water Research (ZeWaF), Freiberg, Germany

Modelling the impact of design variations in a spent nuclear fuel repository on near-field sulfide fluxes and Cu canister corrosion depths

Jin Ma¹, Peter Alt-Epping¹, Mika Niskanen², Barbara Pastina², Paul Wersin¹

1: University of Bern, Switzerland; 2: Posiva Oy, Finland

EURAD-GAS, a step forward in understanding gas transport in clay-ey materials

Séverine Levasseur¹, Xavier Sillen¹, Frédéric Collin², Magdalena Dymitrowska³, Jon Harrington⁴, Elke Jacops⁵, Olaf Kolditz⁶, Paul Marschall⁷, Simon Norris⁸, Jean Talandier⁹, Laurent Truche¹⁰, Jacques Wendling⁹

1: ONDRAF/NIRAS, Belgium; 2: ULiège, Belgium; 3: IRSN, France; 4: BGS, UK; 5: SCK CEN, Belgium; 6: UFZ, Germany; 7: NAGRA, Switzerland; 8: Nuclear Waste Services, UK; 9: Andra, France; 10: Université Grenoble-Alpes, France

Ten years of laboratory gas testing in Boom Clay at the UPC/CIMNE Geotechnical Laboratory

Laura Gonzalez-Blanco^1,2, Enrique Romero^2,1, Séverine Levasseur³

1: International Centre for Numerical Methods in Engineering (CIMNE), Spain; 2: Universitat Politècnica de Catalunya (UPC), Spain; 3: Belgian Agency for Radioactive Waste and Enriched Fissile Materials (ONDRAF/NIRAS), Belgium

Advective gas migration in Opalinus Clay at the Mont Terri URL

Robert Cuss¹, Jocelyn Gisiger², Antonio Rinaldi³, Manuel Sentis⁴, Andrew Wiseall⁵, Jon Harrington¹

1: British Geological Survey, United Kingdom; 2: Solexperts AG, Mönchaltorf, Switzerland; 3: ETH Zurich, Swiss Seismological Service, Zurich, Switzerland; 4: Swiss Federal Nuclear Safety Inspectorate (ENSI), Brugg, Switzerland; 5: Now at Nuclear Waste Services, United Kingdom

Molecular scale understanding of gas transport in clays

Sergey Churakov^1,2, Jerry Owusu^1,2, Athanasios Mokos¹, Konstantinos Karalis², Nikolaos Prasianakis¹

1: Paul Scherrer Institute, Switzerland; 2: University of Berne, Switzerland

Competence building in the frame of radioactive waste management: challenges and expectations

Insights into the Interactions of Clay Minerals and Humic Acids: A Molecular Dynamics Study

Kanato Matsushima¹, Yuta Fukatsu², Takamitsu Ishidera², Ayano Eguchi², Kenji Yotsuji², Yukio Tachi³, Takahiro Ohkubo¹

1: Graduate School of Engineering, Chiba University, Japan; 2: Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, Japan; 3: Horonobe Underground Research Center, Japan Atomic Energy Agency, Japan

Tracking bentonite-water interactions by stable-H- and O-isotope exchange over a thermal gradient: First isotopic results from the Alternative Buffer Materials 2 and 5 bentonites

Nadine J. Kanik¹, Fred J. Longstaffe², Arkadiusz Derkowski¹, H. Albert Gilg³

1: Institute of Geological Sciences, PAS, Poland; 2: The University of Western Ontario; 3: Technical University of Munich

Experimental Study on Evaluation Method of Apparent Erosion Rate Constant of Bentonite using X-ray CT Images

Norihisa Osawa¹, Tomoko Ishii^1,2, Kenji Ishii³, Yuichi Niibori²

1: Taiheiyo Consultant Co., Ltd., Japan; 2: Tohoku University, Japan; 3: Kajima Corporation, Japan

The Hydro-mechanical Interaction between Different Tunnel Support Strategies and the Excavation Damaged Zone (EDZ)

Sina Shivaei¹, Maximilian Schoen¹, Arash Alimardani Lavasan², Torsten Wichtmann¹

1: Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Ruhr University Bochum, Bochum, Germany; 2: Department of Civil Engineering, Luxembourg University, Luxembourg, Luxembourg

Gas transport along granite/bentonite interfaces

Vanesa Gutiérrez Rodrigo, Pedro Luis Martín Martín, María Victoria Villar Galicia

CIEMAT, Spain

What limits the temperature at canister surface in clay-based HLRW concepts? – Discussion in an international context

Saleem Chaudry, Reiner Dohrmann, Robert Lippmann

State Authority for Mining, Energy and Geology (LBEG), Hannover, Germany

The role of bentonite in the high-level radioactive waste repository design

Eva-Maria Gottron, Merle Bjorge, Stephen Klimke, Marc Wengler, Anne Bartetzko, Wolfram Rühaak

Federal Company for Radioactive Waste Disposal (BGE), Germany

Preliminary design of a disposal facility for high-level radioactive waste in claystone

Michael Werres¹, Stephen Klimke¹, Dominik Gottron¹, Frederik Fahrendorf¹, Niklas Bertrams², Thomas Lohser¹, Wolfram Rühaak¹

1: Bundesgesellschaft für Endlagerung mbH, Germany; 2: BGE Technology GmbH, Germany

Characterization of the Lower Cambrian and the Lower Triassic clayey formations in terms of the potential for the sitting of Deep Geological Repository of radioactive waste in Lithuania

Jurga Lazauskienė^1,2, Jolanta Čyžienė²

1: Vilnius University, Lithuania; 2: Lithuanian Geological Survey under Ministry of Environment

Geological variability of the Opalinuston-Formation in Southern Germany: new insights from the research project SEPIA

Thomas Mann¹, Tilo Kneuker¹, Géraldine Nicole Zimmerli², Jochen Erbacher^1,3, André Bornemann¹, Bernhard Schuck¹, Reiner Dohrmann^1,3, Christoph Neukum¹, Lukas Pollok¹

1: Federal Institute for Geosciences and Natural Resources (BGR), Hannover, Germany; 2: Department of Geosciences, University of Fribourg, 1700 Fribourg, Switzerland; 3: State Authority for Mining, Energy and Geology (LBEG), Hannover, Germany

OVERVIEW OF GEODYNAMIC EVOLUTION EFFECT ON HYDROGEOLOGICAL PERFORMANCE OF DEEP GEOLOGICAL REPOSITORY SITE FOR RAWASTE. FEED BACK AND LESSONS LEARNED FROM TWO DECADES OF STUDIES

Hakim BENABDERRAHMANE, Johan HOLMEN

GeoRem Oy, Finland

Kiirunavaara Ca-smectite, northern Sweden: a natural analogue of long-term clay stability

Raphael Schneeberger¹, Ulf B. Andersson², Albert Gilg³, Illya Bindeman⁴, Reiner Dohrmann⁵, Sirpa Kumpulainen⁶, Leena Kiviranta⁶, W. Crawford Elliott⁷, J. Marion Wampler⁷, Cyprian Ozigbo⁸, Igor Villa⁹, Tsubasa Otake¹⁰, Ryosuke Kikuchi¹⁰, Tatsuya Fujimura¹¹, Tsutomu Sato¹⁰, Satoru Suzuki¹², Takahiro Goto¹², Shuhei Nemoto¹², Rizlan Bernier-Latmani¹³, Natalia Jakus¹³, Russell W. Alexander¹⁴, Nicolas Michau¹⁵, Mehran Behazin¹⁶, Alex Hughes¹⁷, Simon Norris¹⁷, Ville Heino¹⁸, Patrik Sellin¹⁹, Daniel Svensson¹⁹, Olivier X. Leupin¹

1: Nagra, Switzerland; 2: LKAB, Sweden; 3: Technische Universität München, Germany; 4: University of Oregon, USA; 5: BGR, Germany; 6: Mitta, Finland; 7: Georgia State University, USA; 8: Columbine Corporation, USA; 9: University of Bern, Switzerland and University of Milan Bicocca, Italy; 10: Faculty of Engineering, Hokkaido University, Japan; 11: Graduate School of Engineering, Hokkaido University, Japan (currently: Civil Engineering Department, Nuclear Facilities Division, Taisei Corporation, Japan); 12: NUMO, Japan; 13: EPFL, Switzerland; 14: Bedrock Geosciences, Switzerland; 15: Andra, France; 16: NWMO, Canada; 17: NWS, UK; 18: Posiva, Finland; 19: SKB, Sweden

Unveiling early diagenetic carbonate precipitation: Sequential C-isotope analysis of calcite and siderite in Opalinus Clay

Stephan Wohlwend¹, Lukas Aschwanden¹, Carmen Zwahlen¹, Martin Mazurek¹, Gaudenz Deplazes²

1: Institute of Geological Sciences, University of Bern, 3012 Bern, Switzerland; 2: Nagra, 5430 Wettingen, Switzerland

Geochemistry of pore waters in Opalinus Clay at the Mont Terri Rock Laboratory within the Bitumen-Nitrate-Clay interaction experiment

Torben Weyand¹, Michael Jendras¹, Katrien Hendrix², Nele Bleyen²

1: Bundesamt für die Sicherheit der nuklearen Entsorgung (BASE), Germany; 2: Belgian Nuclear Research Centre (SCK CEN), Belgium

39Ar and 37Ar in deep groundwater: Evaluation regarding young components, cross-formation flow and in-situ production

Daniel Rufer¹, Roland Purtschert², H. Niklaus Waber³, Michael Heidinger⁴, Daniel Traber⁵, Jens Becker⁵

1: Institute of Geological Sciences, University of Bern, Bern, Switzerland; 2: Climate & Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland; 3: WaterGeoChem Consulting, Bern, Switzerland; 4: Hydroisotop GmbH, Schweitenkirchen, Germany; 5: Nagra, Wettingen, Switzerland

Geochemical profiles in the hydrogeological system of the Opalinus Clay at Mont Terri, Switzerland

Marie Bonitz¹, Anja Maria Schleicher², Theresa Hennig¹, David Jaeggi⁴, Michael Kühn^1,3

1: GFZ German Research Centre for Geosciences, Fluid Systems Modelling, Potsdam, Germany; 2: GFZ German Research Centre for Geosciences, Inorganic and Isotope Geochemistry, Potsdam, Germany; 3: University of Potsdam, Institute of Geosciences, Potsdam, Germany; 4: Federal Office of Topography Swisstopo, Wabern, Switzerland

Crushed claystone used as material for the construction of EBS-components in repositories for nuclear waste – A generic methodology for material selection

Marvin Middelhoff

Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany

Rock mass response to processes in a Sandwich shaft sealing system

Jürgen Hesser¹, Matthias Hinze², Markus Furche¹, David Jaeggi³, Senecio Schefer³

1: Federal Institute for Geosciences and Natural Resources (BGR), Germany; 2: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany; 3: Bundesamt für Landestopografie (swisstopo), Switzerland

Modelling sulfide corrosion in the Swiss HLW repository under various repository settings

Jin Ma¹, Paul Wersin¹, Nikitas Diomidis²

1: University of Bern, Switzerland; 2: Nagra, Switzerland

As-Placed Dry Density of Gap Fill Material in Overbreak Zones within the Placement Room

CHANG SEOK KIM, KENNETH BIRCH, PETER KEECH

Nuclear Waste Management Organization, Canada

Excavation of the Konrad 2 shaft landing station in a clay and marl claystone: geotechnical challenges and support solutions

Stephan Gehne¹, Mike Lieske¹, Jan Bauer¹, Rainer Weißmann¹, Mirko Polster², Volker Busse¹

1: Bundesgesellschaft für Endlagerung mbH, Germany; 2: BGE TECHNOLOGY GmbH, Germany

Feedback on the multi-scale mechanical and technical demonstration of drift construction at the French URL

Jad Zghondi, Gilles Armand, Jana Jaber, Minh-ngoc Vu, Jan Cornet, Carlos Plua, Roy Chaaya

Andra, France

A wireless data transmission system for the future deep geological repository

José Luis García-Siñeriz¹, Susana Tuñón¹, María Rey¹, Juan Carlos Mayor², Katja Emmerich³, Matthias Hinze⁴, David Jaeggi⁵, Senecio Schefer⁵

1: Amphos 21 Consulting S.L., Spain; 2: Empresa nacional de residuos radiactivos (Enresa), Spain; 3: Karlsruhe Institute of Technology (KIT), IMB/MPA/CMM, Karlsruhe, Germany; 4: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Braunschweig, Germany; 5: Bundesamt für Landestopografie (swisstopo), St-Ursanne, Switzerland

Observation of saturation processes in the Sandwich experiment with ERT (URL Mont Terri)

Markus Furche

Bundesanstalt für Geowissenschaften und Rohstoffe, Germany

Influence of polysulfide radicals in measuring corrosion rates of a carbon steel API 5L X65 in contact with cement grout in future nucle-ar waste disposal program

Yendoube Charles SANO MOYEME¹, Stéphanie BETELU¹, Johan BERTRAND², Stéphane GABOREAU¹, Karine GROENEN-SERRANO³

1: BRGM, Orléans, France; 2: ANDRA, Châtelet-Malabry, France; 3: LGC, Toulouse, France

Estimating Water Retention of Compacted Bentonite with Cat-Boost: Integrating Physical Model Residuals and Penalized Learning

Muntasir Shehab, Reza Taherdangkoo, Christoph Butscher

Institute of Geotechnics, TU Bergakademie Freiberg, Gustav-Zeuner-Str. 1,Freiberg, 09599, Germany

Full-Scale In-Situ System Test (FISST) at the Finnish spent nuclear fuel disposal facility. Analysis and simulation.

Xavier Pintado¹, Mika Niskanen²

1: Mitta Engineering Oy, Finland; 2: Posiva Oy, Finland

MANAGEMENT OF SORPTION DATA IN SUPPORT TO RADIOACTIVE WASTE MANAGEMENT

Stéphane Brassinnes¹, Marta López-García², Darío Pérez², Maria Abada², Irene Canals², Albert Nardi², Lara Duro², David García²

1: Belgian Agency for Radioactive Waste and Enriched Fissile Materials (ONDRAF/NIRAS); 2: Amphos21

Numerical analysis of permeability in sphere-platelet mixtures

Ryunosuke Oishi¹, Tsubasa Yagi², Otono Miura¹, Shusaku Harada¹

1: Hokkaido University, Japan; 2: Radioactive Waste Management Funding and Research Center, Japan

Trace elements in Dutch Paleogene clays

Erika Neeft¹, Thilo Behrends², Alwina Hoving³, Jasper Griffioen³, Anne-Catherine Dieudonné⁴, Phil Vardon⁴, Marja Vuorio¹

1: COVRA, Netherlands, The; 2: Utrecht University; 3: TNO; 4: Delft University of Technology

Effect of environmental conditions on the sorption of 241Am(III) on natural clayrocks and their main constituents

Liesbeth Van Laer¹, Dorien Verhaegen¹, Greet Verstrepen¹, Delphine Durce¹, Norbert Maes¹, Stéphane Brassinnes²

1: SCK CEN, Belgium; 2: NIRAS/ONDRAF, Belgium

Radionuclide transport in variably water-saturated compacted clays: a pore-scale view

Yuankai Yang¹, Ravi A. Patel², Yaoting Zhang³, Nikolaos I. Prasianakis⁴, Jenna Poonoosamy¹, Guido Deissmann¹, Sergey V. Churakov^4,5, Dirk Bosbach¹

1: Forschungszentrum Jülich, Germany; 2: Karlsruhe Institute of Technology (KIT), Germany; 3: Queen’s University, Canada; 4: Paul Scherrer Institut, Switzerland; 5: University of Bern, Switzerland

Insights into the Interactions of Clay Minerals and Humic Acids: A Molecular Dynamics Study

Kanato Matsushima¹, Yuta Fukatsu², Takamitsu Ishidera², Ayano Eguchi², Kenji Yotsuji², Yukio Tachi³, Takahiro Ohkubo¹

1: Graduate School of Engineering, Chiba University, Japan; 2: Nuclear Fuel Cycle Engineering Laboratories, Japan Atomic Energy Agency, Japan; 3: Horonobe Underground Research Center, Japan Atomic Energy Agency, Japan

Transport Properties of Water in a Polydisperse Coarse-Grained Model of Sodium Montmorillonite

Yaoting Zhang¹, Mikaella Brillantes², Justine Kuczera¹, Keyvan Ferasat¹, Scott Briggs³, Chang Seok Kim³, Jason D. Giallonardo³, Thomas G. Tranter⁴, George Opletal⁵, Yuankai Yang⁶, Jane Howe², Laurent K. Beland¹

1: Department of Mechanical and Materials Engineering, Queen’s University, Kingston, Canada.; 2: Department of Materials Science and Engineering, University of Toronto, Toronto, Canada; 3: Nuclear Waste Management Organization, Toronto, Canada; 4: Ionworks Technologies Inc, Pittsburgh, United States of America; 5: Commonwealth Scientific and Industrial Research Organization, Data61, Melbourne, Australia; 6: Institute of Energy and Climate Research – Nuclear Waste Management (IEK-6) and JARA-CSD, Forschungszentrum Jülich GmbH, Jülich, Germany

Comparison of experimental diffusion data of various cationic elements in rock samples from the deep-hole drilling campaign in northern Switzerland with model predictions by the ClaySorDif model

Martin A. Glaus¹, Petar Bunic¹, Dmitrii A. Kulik¹, Cyrill Lang¹, George D. Miron¹, Luc R. Van Loon¹, Raphael A.J. Wüst²

1: Paul Scherrer Institut, Switzerland; 2: Nagra, Switzerland

Iron(II)-montmorillonite interaction: experimental results and model-ling for dispersed and compacted systems

Jebril HADI¹, Mirjam KICZKA¹, Andreas JENNI¹, Paul WERSIN¹, Jules GOETHALS², Jean-Marc GRENECHE³, Olivier LEUPIN⁴, Nikitas DIOMIDIS⁴

1: Institute of Geological Sciences, University of Bern, Bern, Switzerland; 2: Laboratoire Subatech, Nantes, France; 3: Le Mans Université, Le Mans, France; 4: Nagra, Wettingen, Switzerland

Electrostatic interactions at clay mineral surfaces: linking geochem-istry with geomechanical properties

Christophe Tournassat^1,2, Wenming Dong², Nicolas Marty³, Sylvain Grangeon³, Carl Steefel²

1: Institut des Sciences de la Terre d’Orléans, Université d’Orléans, CNRS, BRGM, OSUC, Orléans 45071, France; 2: Earth and Environmental Sciences Area, Lawrence Berkeley National Laboratory, Berkeley, CA, USA; 3: BRGM, Orléans, France

Transport experiments in claystone: electrostatic effects and preferential pathways

Andreas Jenni¹, Mirjam Kiczka¹, Carmen Zwahlen¹, Urs Mäder², Hans Meeussen³, Thomas Gimmi^1,4

1: University of Bern, Bern, Switzerland; 2: Rock-Water Consulting, Boll, Switzerland; 3: NRG, Petten, the Netherlands; 4: Laboratory for Waste Management, Paul Scherrer Institut, Villigen, Switzerland

Experimental investigation of the changes in transport properties of Opalinus claystone/concrete interface samples from the Mont Terri CI experiment

Norbert Maes¹, Quoc Tri Phung¹, Thi Nhan Nguyen^1,2, Anneleen Vanleeuw¹

1: SCK CEN, Belgium; 2: KULeuven, Belgium

Cement-Bentonite Interaction with Different Cement Materials at Elevated Temperatures 1: Experiments

Ryohei Kawakita¹, Sohtaro Anraku¹, Yuji Hanamachi², Seiichiro Mitsui¹, Hiroshi Sasamoto¹, Morihiro Mihara¹

1: Japan Atomic Energy Agency, Japan; 2: QJ Science Ltd., Japan

Gains and losses of exchangeable cations in ‘alternative bentonite buffer material in-situ tests’ (ABM-1, -2 and -5) after heating from 140 °C to 250 °C - what has caused observed differences?

Reiner Dohrmann^1,2, Jens Gröger-Trampe^1,2, Stephan Kaufhold²

1: LBEG, Germany; 2: BGR, Germany

Evolution of microbial populations under the influence of increasing temperature in the Callovian-Oxfordian clay-rich rock

Mélanie Lundy¹, Marc Labat², Sylvie Daumas³, Stefan Wechner⁴, Yannick Linard¹

1: Andra, France; 2: Aix-Marseille Université, France; 3: CFG, France; 4: Hydroisotop GmbH, Germany

Differences between the basal spacings of random powder patterns and air-dried oriented aggregates of bentonite samples

Ana Beatriz Zabala¹, María Victoria Villar¹, Jaime F. Cuevas²

1: CIEMAT, Spain; 2: UAM, Spain

Hydrogeochemical processes occurring in excavated argillaceous rocks stored at the surface as heaps and consequences on water chemistry

Myriam I. Agnel¹, Adrien Schwindt¹, Mathieu Debure², Joachim Tremosa³, Yves Thiry¹, Paul-Olivier Redon¹

1: Andra, Centre de Meuse/Haute-Marne, 55290 Bure, France; 2: BRGM, French Geological Survey, 3 av. Claude-Guillemin, 45060 Orléans, France; 3: Geostock, 92500 Rueil-Malmaison, France

A mechanistic understanding of bentonite alteration at corroding iron interfaces

Haydn Martin Haynes¹, Graham Kenyon¹, James Hesketh¹, Cristiano Padovani¹, Lorraine Field², Nikitas Diomidis³

1: Jacobs Clean Energy, Didcot, United Kingdom; 2: British Geological Survey, Keyworth, United Kingdom; 3: Nagra, Wettingen, Switzerland

Mutual effects of pH, matrix elements and organic ligands on the mobility of U(VI) in bentonite systems

Katja Schmeide¹, Thimo Philipp^1,2, Claudia Sieber¹, Nina Huittinen¹

1: Helmholtz-Zentrum Dresden - Rossendorf, Institute of Resource Ecology, Germany; 2: Present address: Federal Office for the Safety of Nuclear Waste Management (BASE), Germany

Quantitative analysis of the mineralogical composition of bentonites by full pattern fitting using the powdR package

Stephen Hillier^1,2, Stephan Kaufhold³, Kristian Ufer³, Jan Dietel⁴, Adrián Lorenzo⁵, Mercedes Suárez⁵

1: James Hutton Institute, United Kingdom; 2: Department of Soil and Environment, SLU, Uppsala, Sweden; 3: BGR, Hannover, Germany; 4: Landeslabor Berlin-Brandenburg, Berlin, Germany; 5: Universidad de Salamanca, Salamanca, Spain

Acidification and CO2-degassing in bentonites triggered by oxida-tion of Fe(II)–containing minerals

Stefan Dultz

Leibniz Universität Hannover, Germany

Dynamic and static experiments for the identification of the effect of transient processes on corrosion

Ana María Fernández, Ursula Alonso, Paula Nieto, Manuel Mingarro, Tiziana Missana

CIEMAT, Spain

Effect of organic molecules on radionuclide retention in COx clay rock: the case of Ni-TBP/EDTA mixtures

Romain V.H. Dagnelie¹, Marwa Assaf¹, Emilie Thory¹, Pierre Henocq²

1: Université Paris-Saclay, CEA, Service de Physico-Chimie, 91191, Gif-sur-Yvette; 2: Andra, R&D Division, parc de la Croix Blanche, 92298, Châtenay-Malabry

Distorting mirrors – new perspectives on the layer charge reduction phenomena in heat-treated smectites: implications for CEC measurements in bentonites

Artur Kuligiewicz, Arkadiusz Derkowski, Nadine J. Kanik

Institute of Geological Sciences, Polish Academy of Sciences, Poland

Self-sealing potential of fractures as a result of hydration, shear, and temperature

Robert Cuss¹, Andrew Wiseall², Jon Harrington¹

1: British Geological Survey, United Kingdom; 2: now at Nuclear Waste Services, United Kingdom

Effect of Sodium Occupancy and Solute Concentration on the Swelling Behaviour of Poorly Indurated Boom Clay

Hassan AL MAIS^1,2,3, Frederic COLLIN¹, Yu-Jun CUI², XiangLing LI³, Elie VALCKE³, Lian WANG³, Suresh SEETHARAM³, Temenuga GEORGIEVA³

1: Université de Liège, Belgium; 2: Ecole des Ponts et Chaussées, Champs-sur-Marne, France; 3: SCK-CEN, Mol, Belgium

The anisotropic creep behaviour and the long-term strength of Opalinus Clay

Lina Gotzen¹, Lisa Winhausen¹, Mohammadreza Jalali¹, Florian Amann^1,2

1: Department of Engineering Geology and Hydrogeology, RWTH Aachen, Germany; 2: Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems IEG, Germany

Numerical analyses of geological barrier integrity under parameter uncertainty

Jan Thiedau, Maximilian Bittens, Maßmann Jobst, Mayr Sibylle

Bundesanstalt für Geowissenschaften und Rohstoffe, Germany

Assessment of in-situ heater experiments conducted in the Callo-vo-Oxfordian claystone based on the French high-level radioactive waste disposal concept

Carlos Plúa¹, Minh-Ngoc Vu², Frédéric Bumbieler², Armand Gilles¹

1: Andra, Meuse/Haute-Marne Underground Research Laboratory, Bure, France; 2: Andra, Châtenay-Malabry, France

HE-E heating experiment in the Mont Terri rock laboratory - sampling of a hot, unconsolidated granular bentonite buffer after 12 years of heating during continued operation

Florian Kober¹, Urs Mäder², Maria Villar³, Bill Lanyon⁴

1: Nagra, Switzerland; 2: Rock Water Consulting, Boll, Switzerland; 3: CIEMAT, Madrid, Spain; 4: Fracture Systems Ltd., St. Ives, Great Britain

A standard thermodynamic-based extension of the Modified Cam-Clay model for plastic-viscoplastic geomaterials

Simon Raude, Goustan Bacquaert, Kyrylo Kazymyrenko, David Haboussa

EDF, France

Enhancements to a Hydromechanical Material Model for Compacted Bentonite

Ola Kristensson¹, Mattias Åkesson²

1: Clay Technology, Lund, Sweden; 2: Swedish Nuclear Fuel and Waste Management Co, Solna, Sweden

Numerical analysis of the re-saturation of bentonites under isothermal and non-isothermal conditions using a double-porosity model

Ramon Vasconcelos¹, Antonio Gens¹, Carlos Eduardo Rodríguez¹, Jean Vaunat¹, María Victoria Villar²

1: Universitat Politècnica de Catalunya (UPC) - CIMNE, Barcelona, Spain; 2: Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain

HYDRO-MECHANICAL BEHAVIOUR OF BENTONITE AT HIGH TEMPERATURE

NATALIA GIMENO, RUBÉN JAVIER IGLESIAS, GUILLERMO GARCIA, MARIA VICTORIA VILLAR

CIEMAT, Spain

Geochemical modelling of mineral-water reaction between Bavarian bentonite B25 and Opalinus clay pore solution

Kyra Jantschik, Artur Meleshyn

GRS gGmbH, Germany

Thermochemical alterations in montmorillonite: Experiment constraints in the presence of organic anion ligands

Ritwick Sudheer Kumar, Laurence N. Warr, Georg H. Grathoff, Balu R. Thombare

University of Greifswald, Institute for Geography and Geology, Department of Economic Geology and Mineralogy, Greifswald, Germany

Tracking bentonite-water interactions by stable-H- and O-isotope exchange over a thermal gradient: First isotopic results from the Alternative Buffer Materials 2 and 5 bentonites

Nadine J. Kanik¹, Fred J. Longstaffe², Arkadiusz Derkowski¹, H. Albert Gilg³

1: Institute of Geological Sciences, PAS, Poland; 2: The University of Western Ontario; 3: Technical University of Munich

Engineered Barrier 200C – High temperature in-situ experiment

Jiří Svoboda, Radek Vašíček

Czech Technical University, Czech Republic

Modeling of the HotBENT test using COMSOL Multiphysics

Daniel Malmberg¹, Alex Spetz¹, Chang Seok Kim²

1: Clay Technology Lund AB, Sweden; 2: Nuclear Waste Management Organisation, Canada

Modelling the Disturbed Rock Zone behaviour in a Deep Geological Repository

Nandini Adla, Pavan Kumar Bhukya, Dali Naidu Arnepalli

Deaprtment of Civil Engineering, Indian Institute of Technology, Madras, India

Elastic-plastic components in void ratio with suction

Tomoyoshi Nishimura¹, Hanbing Bian², Isam Shahrour³

1: Ashikaga University, Japan; 2: Polytech'Lille, Université de Lille, France; 3: Polytech'Lille, Université de Lille, France

Benchmark case for non-isothermal multiphase flow and reactive transport for radioactive waste disposal

Javier Samper¹, Alba Mon¹, Etienne Ausborde², Tianfu Xu³, Yu Han³, Milan Hokr⁴, Asta Narkuniene⁵, Luis Montenegro¹, Brahim Amaziane², Mustapha Elossmani², Y Yuan³, Jan Sembera⁴, Povilas Poskas⁵

1: Universidad de A Coruña, Spain; 2: E2S UPPA, CNRS, LMAP, Universite de Pau et des Pays de l’Adour, Pau, France; 3: College of New Energy and Environment, Jilin University, Changchun 130021, P. R. China; 4: Technical University of Liberec (TUL) Czech Republic; 5: Lithuanian Energy Institute, Nuclear Engineering Laboratory, Kaunas, Lithuania

Experimental and numerical modelling of binary bentonite-based mixture compressibility

Arisleidy Mesa-Alcantara¹, Enrique Romero^1,2, Joel Torres-Serra², Nadia Mokni³

1: International Centre for Numerical Methods in Engineering (CIMNE), Barcelona, Spain; 2: Universitat Politècnica de Catalunya, Barcelona, Spain; 3: Institut de Radioprotection et de Sûreté Nucléaire (IRSN), Fontenay-aux-Roses, France

The influence of faults on the geomechanical properties of Opal-inus Clay – First results from the PF-A experiment

Lisa Winhausen¹, Florian Amann^1,2, Martin Ziegler³, Chris J. Marone^4,5

1: Department of Engineering Geology, RWTH Aachen, Germany; 2: Fraunhofer Research Institution for Energy Infrastructures and Geothermal Systems IEG, Aachen, Germany; 3: Swiss Federal Office of Topography (swisstopo), Mont Terri URL, St-Ursanne, Switzerland; 4: Dipartimento di Scienze della Terra La Sapienza Università di Roma, Italy; 5: Department of Geosciences, Pennsylvania State University, Pennsylvania, USA

Diffusion of dissolved gases in clay: a collaborative modelling exercise of EURAD GAS

Elke Jacops¹, Li Yu¹, Joan Govaerts¹, Abhishek Gupta², Michael Pitz^3,8, Gesa Ziefle³, Anne-Catherine Dieudonné⁵, Asta Narkuniene⁶, Frédéric Collin⁷, Gilles Corman⁷, Séverine Levasseur⁴

1: SCK CEN, Belgium; 2: Aalto University, Finland; 3: BGR, Germany; 4: ONDRAF/NIRAS, Belgium; 5: TU Delft, The Netherlands; 6: Lei, Lithuania; 7: ULiège, Belgium; 8: TU Bergakademie Freiberg, Germany

Experimental Study on Evaluation Method of Apparent Erosion Rate Constant of Bentonite using X-ray CT Images

Norihisa Osawa¹, Tomoko Ishii^1,2, Kenji Ishii³, Yuichi Niibori²

1: Taiheiyo Consultant Co., Ltd., Japan; 2: Tohoku University, Japan; 3: Kajima Corporation, Japan

Modeling of gas propagation along a micro-tunnel in the Meuse / Haute-Marne Underground Research Laboratory

Cécile Coulon¹, Guillermo Martinez¹, Catherine Yu¹, Thomas Cavalera¹, Mohamed Hayek¹, Rémi de La Vaissière²

1: INTERA Incorporated, France/Switzerland/United States; 2: ANDRA, Bure, France

The effect of an alkaline plume on the self-sealing capacity of Boom Clay evidenced by high resolution computed tomography and hy-draulic conductivity measurements

Miroslav Honty¹, Ivan Josipovic², Matthieu N. Boone², Severine Levasseur³, Xavier Sillen³

1: SCK-CEN, Belgian Nuclear Research Center, Mol, Belgium; 2: UGent, Department of Physics and Astronomy, Gent University, Belgium; 3: ONDRAF/NIRAS, Belgian National Agency for Radioactive Waste and Enriched Fissile Materials, Brussels, Belgium

Modelling gas drainage in argillite pores with SPH method

Kayani Ganeshalingam^1,2, Magdalena Dymitrowska¹, Djimédo Kondo²

1: Institut de Radioprotection et de Sûreté Nucléaire(IRSN), PSE-ENV/SPDR/LETIS, France; 2: Institut Jean le Rond d'Alembert, France

The Hydro-mechanical Interaction between Different Tunnel Support Strategies and the Excavation Damaged Zone (EDZ)

Sina Shivaei¹, Maximilian Schoen¹, Arash Alimardani Lavasan², Torsten Wichtmann¹

1: Chair of Soil Mechanics, Foundation Engineering and Environmental Geotechnics, Ruhr University Bochum, Bochum, Germany; 2: Department of Civil Engineering, Luxembourg University, Luxembourg, Luxembourg

Gas transport along granite/bentonite interfaces

Vanesa Gutiérrez Rodrigo, Pedro Luis Martín Martín, María Victoria Villar Galicia

CIEMAT, Spain

Interactions at the interface between EBS-components of a repository for nuclear waste in claystone formations

Marvin Middelhoff¹, Jean Talandier²

1: Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Germany; 2: Agence pour la gestion des déchets radioactifs (Andra), France

Mini GAST: Experimental Upscaling of an Engineered Gas Permeable Seal

Enrique Romero^1,2, Clara Alvarado², Antonio Lloret¹, Juliana Knobelsdorf², Thomas Spillmann³

1: Universitat Politècnica de Catalunya (UPC), Barcelona, Spain; 2: International Centre for Numerical Methods in Engineering (CIMNE), Barcelona, Spain; 3: National Cooperative for the Disposal of Radioactive Waste (Nagra), Wettingen, Switzerland

Laboratory scale experimental assessment of bentonite-sand mixtures

Caroline C. Graham¹, Jon F. Harrington¹, Qian Zhang¹, Jean Talandier², Remi de La Vaissière²

1: British Geological Survey (BGS), United Kingdom; 2: Agence nationale pour la gestion des déchets radioactifs (ANDRA), France

Experimental study and numerical modeling of poromechanical be-haviour of Callovo-Oxfordian claystone under drained and undrained conditions

Yuhao ZHANG¹, Shouyi XIE¹, Jianfu SHAO¹, Minh-Ngoc VU²

1: University of Lille, France; 2: Andra, France

Hydro-mechanical Properties of Rock and Bentonite Mixtures for Gas Management within Geological Disposal Facilities

Elise Wai-Ming Mouat¹, Ian L Molnar¹, Christopher McDermott¹, Bryne Ngwenya¹, Clare Bird², George Towler³

1: The University of Edinburgh, United Kingdom; 2: Stirling University; 3: Quintessa ltd

Hydraulic parameter estimations from borehole testing: evaluating the impact of hydro-mechanical processes in low-permeability clay formations

Luca Urpi¹, Rainer Schwarz¹, Armin Pechstein²

1: CSD Ingenieure AG, Switzerland; 2: Nagra, Switzerland

A physically motivated model concept for the retention behaviour of swelling clayey media in the context of coupled THM simulations

Vinay Kumar¹, Steffen Besse¹, Thomas Nagel²

1: Federal Institute for Geosciences and Natural Resources, Hannover, Germany; 2: Technische Universität Bergakademie Freiberg, Freiberg, Germany

Changes in swelling pressure distribution on radially swollen bentonite buffer surfaces

Shinya Tachibana¹, Tomohide Takeyama¹, Atsushi Iizuka¹, Daisuke Hayashi², Hirohito Kikuchi², Ryo Yasuda²

1: Kobe University, Japan; 2: Radioactive Waste Management Funding and Research Center, Japan

Hydro-mechanical behaviour and microstructural evolution of recompacted Opalinus Clay as backfilling material

Alessio Ferrari¹, Qazim Llabjani¹, Olivier Leupin², Lyesse Laloui¹

1: Swiss Federal Institute of Technology Lausanne (EPFL), Laboratory of Soil Mechanics, Lausanne, Switzerland; 2: Nationale Genossenschaft für die Lagerung radioaktiver Abfälle (NAGRA), Wettingen, Switzerland

Lessons learned from 25 years of experiments on erosion & colloid formation from compacted bentonite

Ursula Alonso, Tiziana Missana

CIEMAT, Spain

Montmorillonite colloid erosion in low ionic strength water under stagnant and flow conditions studied in artificial fractures

Magnus Hedström¹, Ulf Nilsson¹, Ralf Lamminmäki²

1: Clay Technology, Sweden; 2: Posiva Oy, Finland

Numerical modelling of bentonite mass losses due to expansion, erosion, and sedimentation within thin fractures

Arnau Pont¹, Virginia Cabrera¹, Andrés Idiart¹, Mikel Diéguez², Úrsula Alonso², Patrik Sellin³, Macarena Leal³

1: Amphos 21, Spain; 2: CIEMAT, Spain; 3: SKB, Sweden

Quantification of bentonite mass loss in shear zone from CT scans using digital rock physics and machine learning approach: example from the LIT experiment (GTS, Switzerland)

Sarah Hupfer¹, Janis Pingel¹, Bill Lanyon², Raphael Schneeberger³, Ingo Blechschmidt³, Frieder Enzmann⁴, Saeid Sadeghnejad¹, Thorsten Schäfer¹

1: Applied Geology, Institute for Geoscience, Friedrich-Schiller-University Jena, Jena, Germany; 2: Fracture Systems Ltd., St. Ives, United Kingdom; 3: Nagra (National Cooperative for the Disposal of Radioactive Waste), Wettingen, Switzerland; 4: Geoscience Institute, Johannes Gutenberg University Mainz, Mainz, Germany

Hydro-chemo-mechanical modelling of bentonite-based seals - understanding key couplings for long-term performance

Andrés IDIART¹, Marcelo LAVIÑA¹, Miquel DE LA IGLESIA¹, Benoit COCHEPIN², Nicolas MICHAU², Jean TALANDIER²

1: Amphos 21 Consulting S.L., Barcelona, Spain; 2: Andra, Chatenay-Malabry, France

Numerical tool for THCM equilibrium conditions in bentonite

Gema Urraca Lara, Adrián Sánchez-Migallón, Rubén López-Vizcaíno, Ángel Yustres, Laura Asensio, Vicente Navarro

Universidad Castilla La-Mancha, Spain

HMC simulation of swelling pressure test on bentonite using the double structure model considering the surface phenomena of mineral crystal

Hiroyuki Kyokawa, Ryuhei Urata

Nagoya Institute of Technology, Japan

VARS global sensitivity analyses of key geochemical variables for the long-term geochemical evolution of a geological repository

Javier Samper¹, Carlos López-Vázquez², Bruno Pisani¹, Alba Mon¹, Aurora Core Samper-Pilar¹, Javier Samper-Pilar¹

1: Universidad de A Coruña, Spain; 2: Universidad ORT Uruguay

Novel insights into shales and claystones behaviour: results from recent testing campaigns

Eleonora Crisci¹, Silvio Giger²

1: Nesol Numerical Engineering Solutions, Lausanne, Switzerland; 2: Nagra, National Cooperative for the Disposal of Radioactive Waste, Wettingen, Switzerland

Innovative use of distributed fibre optics for assessing the strain field evolution of Opalinus Clay during gas invasion

Qazim Llabjani¹, Alessio Ferrari¹, Paul Marschall², Lyesse Laloui¹

1: Swiss Federal Institute of Technology Lausanne (EPFL), Laboratory of Soil Mechanics, Lausanne, Switzerland; 2: Nationale Genossenschaft für die Lagerung radioaktiver Abfälle (NAGRA), Wettingen, Switzerland

Exploring the thermo-hydro-mechanical behaviour of a plastic deep clayey formation under oedometer conditions

Núria Sau^1,2, Enrique Romero^2,1, Hervé Van Baelen³

1: CIMNE, Spain; 2: UPC, Spain; 3: ONDRAF/NIRAS, Belgium

Hydro-mechanical behaviour of Boom Clay investigated through high capacity consolidated drained triaxial tests.

Sophie De Kock¹, Bertrand François¹, Frédéric Collin¹, Arnaud Dizier², Séverine Levasseur³

1: Université de Liège, Belgium; 2: EURIDICE, Mol, Belgium; 3: ONDRAF/NIRAS, Bruxelles, Belgium

Thermal effects on the drained triaxial compressive and tensile strengths of a transversely isotropic claystone

Chuanrui Wang¹, Christophe de Lesquen², Minh-Ngoc Vu², Jean Talandier², Jianfu Shao¹

1: University of Lille, France; 2: Andra, France

The Integrated Geomodel for the Swiss nuclear waste deep geological repository: towards a digital twin for project optimization

MICHELE CLAPS, VALENTINA ZAMPETTI, IRINA GAUS

NAGRA, Switzerland

Virtual and augmented reality as a cutting-edge technology for modelling of nuclear waste repositories

Kemal Yildizdag, Claus Mindermann, Paul Lorenz

BGE - the Federal Company for Radioactive Waste Disposal, Germany

Sand-claystone mixtures: Investigating the impact of sand proportions on hydro-mechanical behavior at different scales

Anaïs LEROY¹, Olivier CUISINIER¹, Farimah MASROURI¹, Jean TALANDIER²

1: Université de Lorraine – LEMTA (UMR 7563) CNRS, Vandœuvre-lès-Nancy, France; 2: Andra, Châtenay-Malabry, France

Long-term soil-structure interaction for tunnels in poorly indurated clay in the HADES Underground Research Laboratory (Mol, Belgium)

Temenuga Georgieva¹, Arnaud Dizier¹, Mieke De Craen¹, Jan Verstricht¹, Dries Nackaerts¹, Séverine Levasseur²

1: EURIDICE, Belgium; 2: ONDRAF/NIRAS, Belgium

Experimental study on the shear strength and deformation characteristics of normally consolidated reconstituted Boom clay

Bhini Rani Chandan Malagar¹, Philip J. Vardon¹, André Niemeijer², Anne-Catherine Dieudonné¹

1: Delft University of Technology, Delft, The Netherlands; 2: Utrecht University, Utrecht, The Netherlands

NEMESIS: diffusion of dissolved neon in the HADES URL

Elke Jacops¹, Li Yu¹, Guangjing Chen^1,2, Anneleen Vanleeuw¹, Temenuga Georgieva², Xavier Sillen³, Séverine Levasseur³

1: SCK CEN, Belgium; 2: EURDICE, Belgium; 3: ONDRAF/NIRAS, Belgium

Diffusion measurements in natural and synthetic clay-based materi-als: comparison between volumetrically constrained and isotropically stressed samples with differing mineralogy

Jon Harrington¹, Elke Jacops², Elena Tamayo-Mas¹, Andrew Wiseall³, Katherine Daniels⁴

1: British Geological Survey, United Kingdom; 2: SCK CEN, Belgium; 3: Nuclear Waste Services; 4: Cardiff University

Full-3D THM-G Modelling of Gas Permeable Seal Test (GAST) Under Localized Gas Flow Configuration

Erdem Toprak¹, Sebastia Olivella², Enrique Romero²

1: CIMNE, Spain; 2: UPC

Investigation of Gas Transport and Penetration in Saturated Callo-vo-Oxfordian Claystone Using X-ray Microtomography and Digital Volume Correlation

Hailing Shi¹, Jian-fu Shao¹, Shouyi Xie¹, Thomas Rougelot¹, Minh-Ngoc Vu², Jean Talandier²

1: Univ. Lille, CNRS, Centrale Lille, UMR9013 - LaMcube - Laboratoire de Mécanique Multiphysique Multiéchelle, F-59000, Lille, France; 2: Andra, 92298 Chatenay Malabry, France

Effect of the heterogeneity on the gas transport properties of dif-ferent pellet/powder bentonite mixtures

Arisleidy Mesa-Alcantara^1,2, Enrique Romero^1,2, Laura Gonzalez-Blanco^1,2, Juan Mauricio Macías², Nadia Mokni³

1: International Centre for Numerical Methods in Engineering (CIMNE), Barcelona, Spain; 2: Universitat Politècnica de Catalunya (UPC), 08034 Barcelona, Spain; 3: Institut de Radioprotection et de Sûreté Nucléaire IRSN, 92260 Fontenay-aux-Roses, France

KONRAD REPOSITORY - GROUND-CONTROL IN CHALLENGING CLAY STRATA

Developpement and improvement of numerical methods and tools for modelling coupled process: Lessons learnt during EURAD joint programing initiative

Francis CLARET¹, Guillaume PEPIN², Clément CANCES³, Olaf KOLDITZ⁴, Nikolaos PRASIANAKIS⁵, Attila BAKSAY⁶, Dmitry LUKIN⁷

1: BRGM, France; 2: Andra, France; 3: Inria, France; 4: UFZ, Germany; 5: PSI, Switzerland; 6: Ts Enercon, Hungary; 7: SURAO, Czech republic

Physics-Based and Data-Driven Digital Twins for 3D-Temperature Evolution in the Near-field of the FE Tunnel at Mont Terri

WILFRIED PFINGSTEN, Guang Hu

PSI, Switzerland

Advancing Pore Segmentation in Opalinus Clay: A Machine Learning Ensemble with Probability Estimation

Marco Brysch¹, Ben Laurich¹, Monika Sester²

1: Bundesanstalt für Geowissenschaften und Rohstoffe, Hannover; 2: Institute of Cartography and Geoinformatics, Gottfried Wilhelm Leibniz University, Hannover