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Pilot study of seals in boreholes for disposal of spent reactor fuel
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
GeoENcon Ltd.
Greifswald University, Geographical & Geological Department, Germany.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.ORCID iD: 0000-0002-1365-8552
2017 (English)In: Engineering Geology, ISSN 0013-7952, E-ISSN 1872-6917Article in journal (Refereed) Submitted
Abstract [en]

A concept for disposal of highly radioactive waste (HLW) implying placement of the waste in the lower 2 km part of 4 km deep holes bored in granite is examined with special respect to the interaction of rock and sealing materials comprised of cementitious grout, dense clay, and concrete. The bearing idea of deep hole concepts (VDH) is that the waste is located in very salt, stagnant groundwater in rock implying that possibly contaminated water will not reach up to shallow levels. Several technical and environmental issues must be considered in the design and construction, the most important being the need for using long-term tight seals in the holes for eliminating the risk of axial migration of possibly released radionuclides. The described concept implies that the parts of a VDH that intersect fracture-poor rock are sealed with dense expandable clay while concrete is cast where fracture zones are intersected. The matters of particular importance dealt with here are 1) the evolution of the clay and concrete seals in the installation phase, 2) the chemical stability and evolution of either of them and 3) their mutual physical and chemical interaction. Ongoing R&D has given new types of grout and concrete, and comparison of their performances has led to ranking of them for use in VDHs.

Place, publisher, year, edition, pages
2017.
Keyword [en]
Clay, Concrete, Deep boreholes, Disposal of radioactive waste, Civil engineering and architecture - Geoengineering and mining engineering
Keyword [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
National Category
Geotechnical Engineering
Research subject
Soil Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-10065Local ID: 8d0b7d12-7279-42d8-b860-47c0d6695a7dOAI: oai:DiVA.org:ltu-10065DiVA: diva2:983005
Note

Upprättat; 2014; 20140802 (svek)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24

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