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Coupled THM modelling of engineered barriers for the final disposal of spent nuclear fuel isolation

By
Erdem Toprak
Erdem Toprak
International Centre for Numerical Methods in Engineering (CIMNE), Universidad Politécnica de Cataluña, Campus Norte UPC, 08034 Barcelona, Spain
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Sebastia Olivella
Sebastia Olivella
Department of Geotechnical Engineering and Geosciences, Universidad Politécnica de Cataluña, Campus Norte UPC, 08034 Barcelona, Spain
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Xavier Pintado
Xavier Pintado
B+TECH Oy, Laulukuja 4, 00420 Helsinki, Finland
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Published:
January 01, 2017

Abstract

This paper describes the thermohydromechanical (THM) simulation of engineered barrier systems (EBS) for the final disposal of nuclear spent fuel in Finland. The bentonite barriers were simulated with the Barcelona Basic Model and the model was calibrated from laboratory tests. The evolution of gap closure and the presence of a fracture intersecting the disposal were analysed. The simulations were performed in 2D axisymmetrical geometries. Full 3D simulations were carried out in order to check the effect of the third dimension. The time required for the barriers to reach full saturation, the maximum temperature, deformations and displacements at the buffer–backfill interface and the homogenization of components both locally and globally are the main interests. The effect of rock fracture and the hydraulic conductivity of the rock are subjected to 2D sensitivity analyses.

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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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