Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Sensitivity analysis of failure correlation between structures, systems, and components on system risk

  • Seunghyun Eem (School of Convergence & Fusion System Engineering, Major in Plant System Engineering, Kyungpook National University) ;
  • Shinyoung Kwag (Department of Civil and Environmental Engineering, Hanbat National University) ;
  • In-Kil Choi (Korea Atomic Energy Research Institute) ;
  • Daegi Hahm (Korea Atomic Energy Research Institute)
  • Received : 2022.08.10
  • Accepted : 2022.10.30
  • Published : 2023.03.25
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Abstract

A seismic event caused an accident at the Fukushima Nuclear Power Plant, which further resulted in simultaneous accidents at several units. Consequently, this incident has aroused great interest in the safety of nuclear power plants worldwide. A reasonable safety evaluation of such an external event should appropriately consider the correlation between SSCs (structures, systems, and components) and the probability of failure. However, a probabilistic safety assessment in current nuclear industries is performed conservatively, assuming that the failure correlation between SSCs is independent or completely dependent. This is an extreme assumption; a reasonable risk can be calculated, or risk-based decision-making can be conducted only when the appropriate failure correlation between SSCs is considered. Thus, this study analyzed the effect of the failure correlation of SSCs on the safety of the system to realize rational safety assessment and decision-making. Consequently, the impact on the system differs according to the size of the failure probability of the SSCs and the AND and OR conditions.

Keywords

Acknowledgement

This study was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean Government (Ministry of Science and ICT) (No. 2020R1G1A1007570; No. RS-2022-00154571).

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