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http://dx.doi.org/10.7843/kgs.2021.37.4.19

An Influence Analysis on the Gap Space of an Engineered Barrier for an HLW Repository  

Yoon, Seok (Radioactive Waste Disposal Research Division, KAERI)
Lee, Changsoo (Radioactive Waste Disposal Research Division, KAERI)
Kim, Min-Jun (Deep Subsurface Research Center, KIGAM)
Publication Information
Journal of the Korean Geotechnical Society / v.37, no.4, 2021 , pp. 19-26 More about this Journal
Abstract
The high-level radioactive waste (HLW) produced from nuclear power plants is disposed in a rock-mass at a depth of hundreds meters below the ground level. Since HLW is very dangerous to human being, it must be disposed of safely by the engineered barrier system (EBS). The EBS consists of a disposal canister, backfill material, buffer material, and so on. When the components of EBS are installed, gaps inevitably exist not only between the rock-mass and buffer material but also between the canister and buffer material. The gap can reduce water-retarding capacity and heat release efficiency of the buffer material, so it is necessary to investigate properties of gap-filling materials and to analyze gap spacing effect. Furthermore, there has been few researches considering domestic disposal system compared to overseas researches. In this reason, this research derived the peak temperature of the bentonite buffer material considering domestic disposal system based on the numerical analysis. The gap between the canister and buffer material had a minor effect on the peak temperature of the bentonite buffer material, but there was 40% difference of the peak temperature of the bentonite buffer material because of the gap existence between the buffer material and rock mass.
Keywords
Engineered barrier system; Gap spacing; High-level radioactive waste; Numerical analysis;
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Times Cited By KSCI : 1  (Citation Analysis)
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