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Evaluation of temperature-induced effects on safety-relevant properties of clay host rocks with regard to HLW/SF disposal

Published online by Cambridge University Press:  02 January 2018

M. Jobmann  and
A. Meleshyn
M. Jobmann*
Affiliation:
DBE TECHNOLOGY GmbH, Eschenstraße 55, D-31224 Peine, Germany
A. Meleshyn
Affiliation:
Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) gGmbH, Theodor-Heuss-Straße 4, D-38122 Braunschweig, Germany
*
*E-mail: jobmann@dbe.de
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Abstract

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DBE TECHNOLOGY, BGR and GRS are developing a methodology to demonstrate the safety of a repository for high-level waste and spent fuel (HLW/SF) in clays according to the requirements of the German regulating body. In particular, these requirements prescribe that the barrier effect of host rocks must not be compromised by a thermal impact resulting from HLW/SF emplacement. To substantiate and quantify this requirement, we carried out a literature survey of research on thermally-induced changes on clay properties. Effects thus compiled can be divided into thermo-hydro-mechanical and chemical-biological-mineralogical effects and were analysed with regard to their relevance to the integrity of clay host rocks. This analysis identified one effect of major influence within each group: thermal expansion and compaction as well as results of microbial activities. Importantly, it further revealed that a moderate temperature increase above 100°C cannot be expected to compromise the integrity of the geological barrier according to the current knowledge state. Evidence is presented in this paper that temperature increases up to 150°C can actually contribute to an improved performance of a radioactive waste repository by increasing the consolidation of the clay and sterilizing the repository's near-field to depress the deteriorative microbial effects. A quantitative temperature criterion for thermal impact of HLW/SF on clay host rocks is accordingly proposed.

Keywords

geological barriertemperature criterionbarrier integrityhost rocksafety
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 6 , November 2015 , pp. 1389 - 1395
Creative Commons
Creative Common License - CCCreative Common License - BY
Copyright © The Mineralogical Society of Great Britain and Ireland 2015. This is an open access article, distributed under the terms of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

References

Baldi, G., Hueckel, T., Peano, A. and Pellegrini, R. (1991) Developments in modelling of thermo-hydro-geomechanical behaviour of Boom clay and clay-based buffer materials. Technical Report, Volume 1, European Commission, EUR13365/1 EN.Google Scholar
BMU (2010) Safety Requirements Governing the Final Disposal of Heat-Generating Radioactive Waste. Bundesministerium für Umwelt, Naturschutz und Reaktorsicherheit.Google Scholar
Colwell, F.S., Delwiche, M.E., Chandler, D., Fredrickson, J.K., Yao, Q.J., McKinley, J.P. et al. (1997) Microorganisms from deep, high temperature sandstones: constraints on microbial colonization. FEMS Microbiology Reviews, 20, 425–435.CrossRefGoogle Scholar
Cross, M.M., Bottrell, S.H., Manning, D.A. and Worden, R.H. (2004) Thermo-chemical sulfate reduction (TSR), experimental determination of reaction kinetics and implications of the observed reaction rates for petroleum reservoirs. Organic Geochemistry, 35, 393–404.CrossRefGoogle Scholar
Faulkner, D. and Rutter, E. (2003) The effect of temperature, the nature of the pore fluid, and subyield differential stress on the permeability of phyllosilicate-rich fault gouge. Journal of Geophysical Research, 108, B5.Google Scholar
François, B., Laloui, L. and Laurent, C. (2009) Thermo-hydro-mechanical simulation of ATLAS in-situ large scale test in Boom Clay. Computers and Geotechnics, 36, 626–640.CrossRefGoogle Scholar
Gräsle, W. and Plischke, I. (2010) LT Experiment. Mechanical Behaviour of Opalinus Clay. Final report from Mt. Terri phases 6-14. Technical Report, BGR.Google Scholar
Huang, W., Longo, I and Pevear, D. (1993) An experimentally derived kinetic model for smectite-to-illite conversion and its use as a geothermometer. Clays and Clay Minerals, 41, 162–177.CrossRefGoogle Scholar
Jobmann, M. and Polster, M. (2007) The response of Opalinus clay due to heating: A combined analysis of in-situ measurements, laboratory investigations and numerical calculations. Physics and Chemistry of the Earth, 32, 929–936.CrossRefGoogle Scholar
Jobmann, M., Uhlig, L., Amelung, P., Billaux, D., Polster, M. and Schmidt, H. (2007) Untersuchungen zur sicherheitstechnischen Auslegung eines generischen Endlagers im Tonstein in Deutschland. Technical Report, DBE TECHNOLOGY GmbH.Google Scholar
Jobmann, M., Breustedt, M., Li, S., Polster, M. and Schirmer, S. (2013) Investigations on THMEffects in Buffer, EDZ and Argillaceous Host Rock. Final Report, DBE TECHNOLOGY GmbH.Google Scholar
Jobmann, M., Maßmann, J., Meleshyn, A. and Polster, M. (2015) Quantification of Criteria for Integrity Demonstation in Clay. Technical Report, DBE TECHNOLOGY, BGR, GRS (in preparation).Google Scholar
Kull, H., Jockwer, N., Zhang, C.L., Wileveau, Y and Pepa, S. (2007) Measurement of thermally induced pore-water pressure increase and gas migration in the Opalinus Clay at Mont Terri. Physics and Chemistry of the Earth, 32, 937–946.CrossRefGoogle Scholar
Meleshyn, A. (2014) Microbial processes relevant for the long-term performance of radioactive waste repositories in clays. Clays in Natural and Engineered Barriers for Radioactive Waste Confinement. Geological Society, London, Special Publications, 400, http://dx.doi.org/10.1144/SP400.6.CrossRefGoogle Scholar
Nicholson, W. L., Munakata, N., Horneck, G., Melosh, H., Melosh, I and Setlow, P. (2000) Resistance of Bacillus endospores to extreme terrestrial and extraterrestrial environments. Microbiology and Molecular Biology Reviews, 64, 548–572.CrossRefGoogle ScholarPubMed
Pytte, A. and Reynolds, R. (1989) The thermal trans-formation of smectite to Illite. Pp. 133-140 in: Thermal History of Sedimentary Basins (Naer, M.C. and McCulloh, T.H., editors). Chapter 8. Springer, New York.Google Scholar
Sultan, N., Cui, Y and Delage, P. (2002) Temperature effects on the volume change behaviour of Boom clay. Engineering Geology, 64, 135–145.CrossRefGoogle Scholar
Tang, A.-M., Barnel, N. and Cui, Y.-J. (2008) Thermo-mechanical behaviour of a compacted swelling clay. Géotechnique, 58, 45–54.CrossRefGoogle Scholar
Truche, L., Berger, G., Destrigneville, C., Guillaume, D., Giffaut, E. and Pages, A. (2009) Experimental reduction of aqueous sulphate by hydrogen under hydrothermal conditions: implication for the nuclear waste storage. Geochimica et Cosmochimica Acta, 73, 4824–4835.CrossRefGoogle Scholar
Wersin, P., Johnson, L. and McKinley, I. (2007) Performance of the bentonite barrier at temperatures beyond 100°C: A critical review. Physics and Chemistry of the Earth, 32, 780–788.CrossRefGoogle Scholar
Zhang, C.-L., Rothfuchs, T., Jockwer, N., Wieczorek, K., Dittrich, J., Müller, J., etal. (2007) Thermal Effects on the Opalinus Clay. A Joint Heating Experiment of ANDRA and GRS at the Mont Terri URL (HE-D Project). GRS-224. Final report, GRS.Google Scholar
Zhang, C.-L., Czaikowski, O. and Rothfuchs, T (2010) Thermo-hydro-mechanical Behaviour of the Callovo-Oxfordian Clay Rock. GRS-266. Final report, GRS.Google Scholar