Artigo Revisado por pares

Multicomponent gas flow through compacted clay buffer in a higher activity radioactive waste geological disposal facility

2012; Cambridge University Press; Volume: 76; Issue: 8 Linguagem: Inglês

10.1180/minmag.2012.076.8.46

ISSN

1471-8022

Autores

Shakil Masum, Philip J. Vardon, Hywel Rhys Thomas, Q. Chen, Duncan Nicholson,

Tópico(s)

CO2 Sequestration and Geologic Interactions

Resumo

Abstract At the post-closure stage of a geological disposal facility for higher activity radioactive waste several species of gas are likely to be generated in the near-field environment. These could alter the sealing and chemical properties of the bentonite buffer and the local geochemical environment significantly. The authors' attempt to simulate multicomponent gas flow through variably saturated porous media is presented. Governing equations have been developed for a reactive gas-flow model to simulate the thermo-hydro-gas-chemical-mechanical behaviour, with specific reference to the performance of highly compacted bentonite buffer subjected to repository gas generation and migration. The developed equations have been included in the bespoke numerical model COMPASS and some generic simulations are also presented. The model presented extends current capability to assess buffer performance.

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