Conference Abstract
| 
10 Nov 2021
Conference Abstract |
| 10 Nov 2021
| 10 Nov 2021
Compaction of crushed salt for safe containment – overview of the KOMPASS project
Larissa Friedenberg
CORRESPONDING AUTHOR
Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Theodor-Heuss-Straße 4, 38122 Braunschweig, Germany
James Bean
Sandia National Laboratories, New Mexico, 1515 Eubank SE,
Albuquerque, New Mexico 87123, USA
Oliver Czaikowski
Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Theodor-Heuss-Straße 4, 38122 Braunschweig, Germany
Uwe Düsterloh
Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics, Chair for Waste Disposal Technologies and Geomechanis, Clausthal University of Technology, Erzstraße 20, 38678 Clausthal-Zellerfeld, Germany
Nina Müller-Hoeppe
BGE TECHNOLOGY GmbH, Eschenstraße 55, 31224 Peine, Germany
Ben Laurich
Rock characterization for storage and final disposal, Federal Institute for Geosciences and Natural Ressources (BGR), Stilleweg 2, 30655 Hannover, Germany
Christian Lerch
BGE TECHNOLOGY GmbH, Eschenstraße 55, 31224 Peine, Germany
Svetlana Lerche
Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics, Chair for Waste Disposal Technologies and Geomechanis, Clausthal University of Technology, Erzstraße 20, 38678 Clausthal-Zellerfeld, Germany
Christoph Lüdeling
Geotechnik/Endlagerforschung, Institut für Gebirgsmechanik GmbH, Friederikenstraße 60, 04279 Leipzig, Germany
Melissa Mills
Sandia National Laboratories, New Mexico, 1515 Eubank SE,
Albuquerque, New Mexico 87123, USA
Till Popp
Geotechnik/Endlagerforschung, Institut für Gebirgsmechanik GmbH, Friederikenstraße 60, 04279 Leipzig, Germany
Benjamin Reedlunn
Sandia National Laboratories, New Mexico, 1515 Eubank SE,
Albuquerque, New Mexico 87123, USA
Dieter Stührenberg
Rock characterization for storage and final disposal, Federal Institute for Geosciences and Natural Ressources (BGR), Stilleweg 2, 30655 Hannover, Germany
Kristoff Svensson
Rock characterization for storage and final disposal, Federal Institute for Geosciences and Natural Ressources (BGR), Stilleweg 2, 30655 Hannover, Germany
Kornelia Zemke
Rock characterization for storage and final disposal, Federal Institute for Geosciences and Natural Ressources (BGR), Stilleweg 2, 30655 Hannover, Germany
Juan Zhao
Institute of Mineral and Waste Processing, Waste Disposal and Geomechanics, Chair for Waste Disposal Technologies and Geomechanis, Clausthal University of Technology, Erzstraße 20, 38678 Clausthal-Zellerfeld, Germany
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Larissa Friedenberg, Jeroen Bartol, James Bean, Steffen Beese, Hendrik Bollmann, Hans J. P. de Bresser, Jibril Coulibaly, Oliver Czaikowski, Uwe Düsterloh, Ralf Eickemeier, Ann-Kathrin Gartzke, Suzanne Hangx, Ben Laurich, Christian Lerch, Svetlana Lerche, Wenting Liu, Christoph Lüdeling, Melissa M. Mills, Nina Müller-Hoeppe, Bart van Oosterhout, Till Popp, Ole Rabbel, Michael Rahmig, Benjamin Reedlunn, Christopher Rölke, Christopher Spiers, Kristoff Svensson, Jan Thiedau, and Kornelia Zemke
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For the deep geological disposal of high-level nuclear waste in rock salt formations, the safety concept includes the backfilling of open cavities with crushed salt. For the prognosis of the sealing function of the backfill for the safe containment of the nuclear waste, it is crucial to have a comprehensive process understanding of the crushed-salt compaction behavior. The KOMPASS projects were initiated to improve the scientific knowledge of using crushed salt as backfill material.
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The presentation will present the results of the research work for the development, construction and commissioning of the pilot plant as well as successful mechanical-hydraulically coupled tests to demonstrate the functionality of sealing elements made of salt cut bricks.
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In Switzerland, the Opalinus Clay (OPA) formation is favored to host a repository for nuclear waste. Thus, we must know its deformation behavior. In this study, we focused on the microstructure of gouge, a thin (< 2 cm), drastically strained clay layer at the so-called Main Fault in the Mont Terri rock laboratory. We suggest that in situ gouge deforms in a more viscous manner than undeformed OPA in laboratory conditions. Moreover, we speculate about the origin and evolution of the gouge layer.
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Scaly clay is a well-known rock fabric that can develop in tectonic systems and that can alter the physical rock properties of a formation. However, the internal microstructure and evolution of this fabric remain poorly understood. We examined the scaly microstructure of progressively faulted Opalinus Clay using optical as well as scanning electron microscopy. We show that as little as 1 vol.% in scaly clay aggregates is strained and present an evolutionary model for this.
Cited articles
Hansen, F. D., Popp, T., Wieczorek, K., and Stührenberg, D.: Granular Salt
Summary: Reconsolidation Principles and Applications, Fuel Cycle Research &
Development, FCRD-UFD-2014-000590, SAND2014-16141R, 2014.
KOMPASS Phase 1: Czaikowski, O., Friedenberg, L., Wieczorek, K.,
Müller-Hoeppe, N., Lerch, Ch., Eickemeier, R., Laurich, B., Wenting, L.,
Stührenberg, D., Svensson, K., Zemke, K., Lüdeling, Ch., Popp, T.,
Bean, J., Mills, M., Reedlunn, B., Düsterloh, U., Lerche, S., and Zhao, J.: Compaction of crushed salt for the safe containment, KOMPASS project, Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, GRS-608, Köln, 2020.
Kröhn, K.-P., Stührenberg, D., Jobmann, M., Heemann, U.,
Czaikowski, O., Wieczorek, K., Müller, Ch., Zhang, C.-L., Moog, H.,
Schirmer, S., and Friedenberg, L.: Mechanical and hydraulical behaviour of compacting crushed salt backfill at low porosities, Repoperm 2, Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, GRS-450, Köln, 2017.
