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Combining high-resolution two-phase with simplified single-phase simulations in order to optimize the performance of PA/SA simulations for a deep geological repository for radioactive waste

By
Philipp Schaedle
Philipp Schaedle
1
AF-Consult Switzerland Ltd, Groundwater Protection and Waste Disposal, Täfernstrasse 26, CH-5405 Baden, Switzerland
2
Present address: ETH Zürich, Rämistrasse 101, 8092 Zürich, Switzerland
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Thomas Kaempfer
Thomas Kaempfer
1
AF-Consult Switzerland Ltd, Groundwater Protection and Waste Disposal, Täfernstrasse 26, CH-5405 Baden, Switzerland
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Guillaume Pépin
Guillaume Pépin
3
ANDRA, 1–7 rue Jean Monnet, Parc de la Croix-Blanche, F-92298 Châtenay-Malabry Cedex, France
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Jacques Wendling
Jacques Wendling
3
ANDRA, 1–7 rue Jean Monnet, Parc de la Croix-Blanche, F-92298 Châtenay-Malabry Cedex, France
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Juergen Brommundt
Juergen Brommundt
1
AF-Consult Switzerland Ltd, Groundwater Protection and Waste Disposal, Täfernstrasse 26, CH-5405 Baden, Switzerland
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Published:
January 01, 2017

Abstract

The transport of a radioactive solute during the transient thermo-hydraulic regime with gas generation in and around a disposal cell depends on complex multi-phase processes. Numerical simulations can improve the understanding of the system by providing detailed information on the temporal and spatial distribution of the radionuclides. In particular, their fluxes can be computed under the given transient conditions considering radionuclide, heat and gas release from the waste. However, such detailed multi-phase simulations are very demanding with respect to computational resources and time. Based on the knowledge gained from such complex simulations, we have developed a robust simplified single-phase approach for performance and safety assessment, the improved efficiency of which enables extensive parameter studies. The simplified approach comprises, on the one hand, homogenization of features of high detail and, on the other hand, the employment of two-phase simulation results that are used to deduce equivalent single-phase parameterizations. The results have been validated with various benchmark criteria at well-defined interfaces in the modelled disposal cells based on the simulated radionuclides fluxes.

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Contents

Geological Society, London, Special Publications

Radioactive Waste Confinement: Clays in Natural and Engineered Barriers

S. Norris
S. Norris
Radioactive Waste Management, UK
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J. Bruno
J. Bruno
Amphos 21, Spain
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M. van Geet
M. van Geet
ONDRAF/NIRAS, Belgium
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E. Verhoef
E. Verhoef
COVRA, The Netherlands
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Geological Society of London
Volume
443
ISBN electronic:
9781786203267
Publication date:
January 01, 2017

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