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http://dx.doi.org/10.7843/kgs.2017.33.10.25

Thermal Properties of Buffer Material for a High-Level Waste Repository Considering Temperature Variation  

Yoon, Seok (Radioactive Waste Disposal Research Division, KAERI)
Kim, Geon-Young (Radioactive Waste Disposal Research Division, KAERI)
Park, Tae-Jin (Radioactive Waste Disposal Research Division, KAERI)
Lee, Jae-Kwang (Radioactive Waste Disposal Research Division, KAERI)
Publication Information
Journal of the Korean Geotechnical Society / v.33, no.10, 2017 , pp. 25-31 More about this Journal
Abstract
The buffer is one of the major components of an engineered barrier system (EBS) for the disposal of high-level radioactive waste (HLW). As the buffer is located between a disposal canister and host rock, it is indispensable to assure the disposal safety of high-level radioactive waste. It can restrain the release of radionuclide and protect the canister from the inflow of groundwater. Since high quantity of heat from a disposal canister is released to the surrounding buffer, thermal properties of the buffer are very important parameters for the analysis of the entire disposal safety. Especially, temperature criteria of the compacted bentonite buffer can affect the design of HLW repository facility. Therefore, this paper investigated thermal properties for the Kyungju compacted bentonite buffer which is the only bentonite produced in South Korea. Hot wire method and dual probe method were used to measure thermal conductivity and specific heat capacity of the compacted bentonite buffer according to the temperature variation. Thermal conductivity and specific heat capacity were decreased dramatically when temperature variation was between $22^{\circ}C{\sim}110^{\circ}C$ as degree of saturation decreased according to the temperature variation. However, there was little variation under the high temperature condition at $110^{\circ}C{\sim}150^{\circ}C$.
Keywords
Compacted bentonite buffer; Thermal conductivity; Specific heat capacity; Temperature variation;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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