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Modelling thermo-hydro-mechano-chemical interactions for nuclear waste disposal

Journal of Rock Mechanics and Geotechnical Engineering 2010年第2期2卷 97-102页

作者： A.Gens L.do N.Guimaraes S.Olivella M.Sánchez Department of Geotechnical Engineering and Geosciences Technical University of Catalonia Universidade Federal de Pernambuco Texas A & M University College Station

A fully coupled thermo-hydro-mechano-chemical（THMC） formulation is described in this *** attention is paid to phenomena likely to be encountered in clay barriers used as engineered barriers in the disposal of nuclear radioactive *** types of processes considered in the chemical formulation include hydrolysis,complex formation,oxidation/reduction reactions,acid/base reactions,precipitation/dissolution of minerals and cation *** kinetics-and equilibrium-controlled reactions are *** formulation is implemented in a numerical *** application is presented concerning the performance of a large-scale in-situ heating test simulating high-level radioactive waste repository conditions.

关键词： coupling analysis thermo-hydro-mechano-chemical(THMC) analysis radioactive waste engineered barriers bentonite cation exchange

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Optimal ways of disposal of highly radioactive waste

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Natural Science 2012年第11期4卷 906-918页

作者： Roland Pusch Sven Knutsson Laith Al-Taie Mohammed Hatem Mohammed Department of Civil Environmental and Natural Resources EngineeringLulea University of TechnologyLuleaSweden

Multibarrier concepts are commonly proposed for effective isolation of highly radioactive waste (HLW). Present concepts consider the host rock as a barrier by retarding migration of possibly released radionuclides to the biosphere, containers for preventing release of radionuclides, and “buffer clay” embedding the canisters for providing ductility and minimizing the risk of container breakage and for delaying migration of possibly escaping radionuclides. Closer analysis of the isolating functions shows that rock will only serve as a mechanical protection of the “nearfield”, the containers of proposed types can be short-lived, and the surrounding clay will be increasingly permeable and stiffen hence becoming less ductile with time. A different approach, representing an alternative to the common concepts, can be safer and cheaper. It takes the HIPOW copper canister as the only major barrier and a cheap but sufficiently efficient buffer as embedment. The repository can consist of an abandoned copper mine, an option being to place HLW in emptied drifts while mining is still going in not yet exploited parts of the ore body.

关键词： Hazardous Waste Repositories Crystalline Rock engineered barriers

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