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Mechanisms Involved in Maturation of Clay Seals in Boreholes for Storing Spent Reactor Fuel
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-6851-4839
Greifswald University, Germany.
Greifswald University, Germany.
Technical University of Darmstadt, Germany.
2019 (English)In: Journal of Earth Sciences and Geotechnical Engineering, ISSN 1792-9040, E-ISSN 1792-9660, Vol. 9, no 3, p. 197-226Article in journal (Refereed) Published
Abstract [en]

Smectite clay, especially montmorillonite, is proposed for isolating canisters containing highly radioactive waste (HLW) like spent reactor fuel placed in deep boreholes. It is used for minimizing groundwater flow around and along waste packages (“Buffer Clay”) and for providing them with ductile embedment for eliminating risk of canister damage caused by displacements in the host rock. The clay has the form of heavily compacted blocks of granules that swell in conjunction with water uptake until their full hydration potential has been utilized. The dense clay blocks are fitted in perforated supercontainers that are submerged in smectite mud. The long-term chemical stability of the clay is sufficient for providing the required waste-isolating capacity, which is primarily supplied by the heavyness of stagnant, very salt groundwater at depth.

Place, publisher, year, edition, pages
UK: Scientific Press International Limited , 2019. Vol. 9, no 3, p. 197-226
Keywords [en]
Smectite clay, montmorillonite, isolating canisters, highly radioactive waste (HLW), supercontainers, dry density, settlement, creep settlement, microstructure of smectite clay
National Category
Engineering and Technology Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-75710OAI: oai:DiVA.org:ltu-75710DiVA, id: diva2:1346236
Note

Validerad;2019;Nivå 1;2019-09-02 (johcin)

Available from: 2019-08-27 Created: 2019-08-27 Last updated: 2019-09-02Bibliographically approved

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