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Feasibility study for the criticality calculations of the LEU+ with ATF fuels

차균호|조석근|차건일
한국원자력학회 (Korean Nuclear Society)|2025.09|Nuclear Engineering and Technology|제57권 제9호|DOI 10.1016/j.net.2025.103619

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키워드

Monte CarloCriticality analysisNeutron absorberAccident tolerant fuelFuel storage systemBoron areal density
주제분류원자력공학

초록

This study evaluates the criticality safety of Accident Tolerant Fuel (ATF) and LEU+ (5–10 wt% U-235) in the APR-1400 spent fuel pool (Region 1) and new fuel storage vault (NFSV) using SCALE 6.3.1’s CSAS6/KENO-VI module. It was confirmed that simply increasing fuel enrichment above 5 wt% significantly raises criticality risk. To solve this risk, neutron absorber plates should be added to existing storage racks. By adding absorbers, ATF enriched up to 8 wt% in Region 1 and 10 wt% in the NFSV remained safely subcritical. Compliance with NRC guidelines necessitates such absorber modifications, especially considering boron areal density, flux trap characteristics. Consequently, although higher enrichment elevates criticality risks, the proper design of absorber plates can ensure sufficient safety margins. These findings are expected to aid in designing and operating storage facilities for future adoption of LEU+ and ATF.

Abstract

This study evaluates the criticality safety of Accident Tolerant Fuel (ATF) and LEU+ (5–10 wt% U-235) in the APR-1400 spent fuel pool (Region 1) and new fuel storage vault (NFSV) using SCALE 6.3.1’s CSAS6/KENO-VI module. It was confirmed that simply increasing fuel enrichment above 5 wt% significantly raises criticality risk. To solve this risk, neutron absorber plates should be added to existing storage racks. By adding absorbers, ATF enriched up to 8 wt% in Region 1 and 10 wt% in the NFSV remained safely subcritical. Compliance with NRC guidelines necessitates such absorber modifications, especially considering boron areal density, flux trap characteristics. Consequently, although higher enrichment elevates criticality risks, the proper design of absorber plates can ensure sufficient safety margins. These findings are expected to aid in designing and operating storage facilities for future adoption of LEU+ and ATF.

관련 논문AI추천

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