文章基本信息

标题：Mechanisms Involved in Maturation of Clay Seals in Boreholes for Storing Spent Reactor Fuel
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作者：Roland Pusch ; Jörn Kasbohm ; Thao Hoang-Minh 等
期刊名称：Journal of Earth Sciences and Geotechnical Engineering
印刷版ISSN：1792-9040
出版年度：2019
卷号：9
期号：3
页码：199-228
语种：English
出版社：Scienpress Ltd
摘要：Smectite clay, especially montmorillonite, is proposed for isolating canisterscontaining highly radioactive waste (HLW) like spent reactor fuel placed in deepboreholes. It is used for minimizing groundwater flow around and along wastepackages (“Buffer Clay”) and for providing them with ductile embedment foreliminating risk of canister damage caused by displacements in the host rock. Theclay has the form of heavily compacted blocks of granules that swell in conjunctionwith water uptake until their full hydration potential has been utilized. The denseclay blocks are fitted in perforated supercontainers that are submerged in smectitemud. The long-term chemical stability of the clay is sufficient for providing therequired waste-isolating capacity, which is primarily supplied by the heavyness ofstagnant, very salt groundwater at depth.
关键词：Smectite clay; montmorillonite; isolating canisters; highlyradioactive waste (HLW); supercontainers; dry density; settlement; creepsettlement; microstructure of smectite clay.