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Predicted and actual wetting rate of buffer in repositories for high-level radioactive waste
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
El-Tekno AB.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Mining and Geotechnical Engineering.
2014 (English)In: Waste Management and The Environment VII / [ed] C.A. Brebbia; G. Passerini; H. Itoh, Southampton: WIT Press, 2014Conference paper (Refereed)
Abstract [en]

Underground test sites for disposal of high-level radioactive waste (HLW) are commonly equipped with instrumentation for documentation of the evolution of engineered barriers and of changes in the physical state of the host rock. The rate of hydration of the clay buffer surrounding waste canisters determines the physical interaction with the rock and waste canisters and is recorded by use of RH meters and by measuring the swelling pressure exerted on cells installed in the clay. They are connected to cables and tubings extending to the recording units placed in room atmosphere. If they pass from the rock through the buffer groundwater under pressure can migrate through or along bunches of cables and tubings and reach the points of measurement earlier than in clay without instrumentation. The inconvenience is avoided by tight embedment of individual cables and tubings and placement of the pressure gauges such that they do not pass through the clay. Incorrect rates of hydration has led to the inadequate conclusion that water flows in unsaturated parts of the buffer according Darcy’s law while it is in fact migrating by coupled diffusion processes.

Place, publisher, year, edition, pages
Southampton: WIT Press, 2014.
, W I T Transactions on Ecology and the Environment, ISSN 1746-448X ; 180
Keyword [en]
buffer, cables, instrumentation, pressure sensors, thermocouples, tubings, Civil engineering and architecture - Geoengineering and mining engineering
Keyword [sv]
Samhällsbyggnadsteknik och arkitektur - Geoteknik och gruvteknik
Research subject
Soil Mechanics
URN: urn:nbn:se:ltu:diva-29507DOI: 10.2495/WM140341Local ID: 30307a0c-0ab0-40ae-8366-b78bf136edc5ISBN: 978-1-84564-760-5OAI: diva2:1002731
International conference on Waste Management and the Environment : 12/05/2014 - 14/05/2014
Godkänd; 2014; 20140228 (svek)Available from: 2016-09-30 Created: 2016-09-30Bibliographically approved

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Pusch, RolandKnutsson, Sven
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