Thermal Conductivity Evaluation of Compacted Bentonite Buffers Considering Temperature Variations압축 벤토나이트 완충재의 온도에 따른 열전도도 평가

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An engineered barrier system (EBS) for the geological disposal of high-level radioactive waste (HLW) consists of a disposal canister packed with spent fuel, buffer material, backfill material, and gap-filling material. The buffer material fills the space between the canister and the near-field rock, thus serving to restrain the release of radionuclides and protect the canister from groundwater penetration. Furthermore, as significant amounts of heat energy are released from the canister to the surrounding rock, the thermal conductivity of the buffer plays an important role in maintaining the safety of the entire disposal system. Therefore, given the high levels of heat released from disposal canisters, this study measured the thermal conductivities of compacted bentonite buffers from Gyeongju under temperature variations ranging 25 to 80~90℃. There was a 5~20% increase in thermal conductivity as the temperature increased, and the temperature effect increased as the degree of saturation increased.
Publisher
한국방사성폐기물학회
Issue Date
2020-03
Language
English
Citation

Journal of Nuclear Fuel Cycle and Waste Technology, v.18, no.1, pp.43 - 49

ISSN
1738-1894
DOI
10.7733/jnfcwt.2020.18.1.43
URI
http://hdl.handle.net/10203/276939
Appears in Collection
CE-Journal Papers(저널논문)
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