Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Feasibility Study on Cross-tie Systems in Nuclear Power Plants Using Multi-unit PSA

다수기 PSA를 활용한 원전 안전자원 공유 활용성 평가

  • Jong Woo Park (Risk Assessment Research Division, Korea Atomic Energy Research Institute) ;
  • Ho-Gon Lim (Risk Assessment Research Division, Korea Atomic Energy Research Institute) ;
  • Jae Young Yoon (Risk Assessment Research Division, Korea Atomic Energy Research Institute)
  • 박종우 (한국원자력연구원 리스크평가연구부) ;
  • 임호곤 (한국원자력연구원 리스크평가연구부) ;
  • 윤재영 (한국원자력연구원 리스크평가연구부)
  • Received : 2023.01.02
  • Accepted : 2023.04.27
  • Published : 2023.06.30
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Abstract

Following the accident at Fukushima, the true impact of multi-unit accidents came to light. Accordingly, research related to multi-unit accident effect analysis, risk evaluation, and accident prevention/prevention technology has been conducted. Specific examples are mobile/fixed equipment such as multi-barrier accident coping strategy (MACST) and diverse and flexible coping strategies (FLEX), which have been introduced and installed in multi-units for preventing and mitigating multi-unit accidents. These strategies are useful for enhancing the safety of nuclear power plants (NPPs); however, a more efficient strategy is required in terms of the costs of physical and human resources. To effectively and efficiently mitigate an increase in multi-unit accidents, it is necessary to not only to utilize mobile/fixed equipment but to also use crosstie options with resources that already exist at NPPs. Therefore, we analyzed the current international and domestic status of crosstie systems technology and propose a method to evaluate feasibility alongside risk based on a multi-unit probabilistic safety assessment (PSA). To analyze the international and domestic status of crosstie systems technology, actual cases and related research were studied, and a list of potential crosstie safety resources was derived. Additionally, a case study was performed on crosstie cases of two systems within the assumed six units on-site under a multi-unit accident, and a multi-unit PSA-based risk evaluation method is proposed.

Keywords

Acknowledgement

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning(KETEP) and the Ministry of Trade, Industry & Energy(MOTIE) of the Republic of Korea (No. 20224B10200050).

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