Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Identification of Optimal Seismic Capacity of MACST Facilities for Seismic Risk Reduction of Nuclear Power Plant

원전 지진 리스크 저감을 위한 MACST 설비의 내진 성능 최적화

  • Kim, Minkyu (Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute) ;
  • Choi, Eujeong (Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute) ;
  • Jang, Seunghyun (Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute) ;
  • Hahm, Daegi (Structural and Seismic Safety Research Division, Korea Atomic Energy Research Institute)
  • 김민규 (한국원자력연구원 구조.지진안전연구부) ;
  • 최유정 (한국원자력연구원 구조.지진안전연구부) ;
  • 장승현 (한국원자력연구원 구조.지진안전연구부) ;
  • 함대기 (한국원자력연구원 구조.지진안전연구부)
  • Received : 2024.08.02
  • Accepted : 2024.09.30
  • Published : 2024.11.01
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Abstract

This study investigates the risk reduction effect and identifies the optimal capacity of Multi-barrier Accident Coping Strategy (MACST) facilities for nuclear power plants (NPPs) under seismic hazard. The efficacy of MACST facilities in OPR1000 and APR1400 NPP systems is evaluated by utilizing the Improved Direct Quantification of Fault Tree with Monte Carlo Simulation (I-DQFM) method. The analysis encompasses a parametric study of the seismic capacity of two MACST facilities: the 1.0 MW large-capacity mobile generator and the mobile low-pressure pump. The results demonstrate that the optimal seismic capacity of MACST facilities for both NPP systems is 1.5g, which markedly reduces the probability of core damage. In particular, the core damage risk is reduced by approximately 23% for the OPR1000 system, with the core damage fragility reduced by approximately 72% at 1.0g seismic intensity. For the APR1400 system, the implementation of MACST is observed to reduce the core damage risk by approximately 17% and the core damage fragility by approximately 44% under the same conditions. These results emphasize the significance of integrating MACST facilities to enhance the resilience and safety of NPPs against seismic hazard scenarios, highlighting the necessity for continuous adaptation of safety strategies to address evolving natural threats.

Keywords

Acknowledgement

본 연구는 2022년도 정부(과학기술정보통신부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(No. RS-2022-00154571).

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