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http://dx.doi.org/10.7733/jnfcwt.2022.038

Nuclear Criticality Analyses of Two Different Disposal Canisters for Deep Geological Repository Considering Burnup Credit  

Hyungju Yun (Korea Radioactive Waste Agency)
Manho Han (Korea Radioactive Waste Agency)
Seo-Yeon Cho (Korea Radioactive Waste Agency)
Publication Information
Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) / v.20, no.4, 2022 , pp. 501-510 More about this Journal
Abstract
The nuclear criticality analyses considering burnup credit were performed for a spent nuclear fuel (SNF) disposal cell consisting of bentonite buffer and two different types of SNF disposal canister: the KBS-3 canister and small standardized transportation, aging and disposal (STAD) canister. Firstly, the KBS-3 & STAD canister containing four SNFs of the initial enrichment of 4.0wt% 235U and discharge burnup of 45,000 MWD/MTU were modelled. The keff values for the cooling times of 40, 50, and 60 years of SNFs were calculated to be 0.79108, 0.78803, and 0.78484 & 0.76149, 0.75683, and 0.75444, respectively. Secondly, the KBS-3 & STAD canister with four SNFs of 4.5wt% and 55,000 MWD/MTU were modelled. The keff values for the cooling times of 40, 50, and 60 years were 0.78067, 0.77581, and 0.77335 & 0.75024, 0.74647, and 0.74420, respectively. Therefore, all cases met the performance criterion with respect to the keff value, 0.95. The STAD canister had the lower keff values than KBS-3. The neutron absorber plates in the STAD canister significantly affected the reduction in keff values although the distance among the SNFs in the STAD canister was considerably shorter than that in the KBS-3 canister.
Keywords
Nuclear criticality analysis; Burnup credit; Disposal cell; KBS-3 disposal canister; STAD disposal canister; Spent nuclear fuel;
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Times Cited By KSCI : 1  (Citation Analysis)
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