Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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A Study on the Multiple Spurious Operation Analysis in Fire Events Probabilistic Safety Assessment of Domestic Nuclear Power Plant

국내 원자력발전소의 화재사건 확률론적안전성평가에서 다중오동작 분석 연구

  • 강대일 (한국원자력연구원 리스크.환경안전연구부) ;
  • 정용훈 (한국원자력연구원 리스크.환경안전연구부) ;
  • 최선영 (한국원자력연구원 리스크.환경안전연구부) ;
  • 황미정 (한국원자력연구원 리스크.환경안전연구부)
  • Received : 2018.10.01
  • Accepted : 2018.12.11
  • Published : 2018.12.31
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Abstract

In this study, we conducted a pilot study on the multiple spurious operations (MSO) analysis in the fire probabilistic safety assessment (PSA) of domestic nuclear power plant (NPP) to identify the degree of influence of the operator actions used in the MSO mitigation strategies. The MSO scenario of the domestic reference NPP selected for this study is refueling water tank (RWT) drain down event. It could be caused by spurious operations of the containment spray system (CSS) of the reference NPP. The RWT drain down event can be stopped by the main control room (MCR) operator actions for stopping the operation of CSS pump or closing the CSS motor operated valve if the containment spray actuation signal (CSAS) is spuriously actuated. Outside the MCR, it can be stopped by operator actions for closing the CSS manual valves or motor operated valve or stopping the operation of CSS pump. The quantification result of a fire PSA model that takes into account all recovery actions for the RWT drain down event lead to risk reduction by about 95%, compared with quantification result of fire PSA model without considering them. Among the various operator actions, the recovery action for the spurious CSAS operations and the operator action for the manual valve are identified as the most important operator actions. This study quantitatively showed the extent to which the operator actions used as MSO countermeasures have affected the fire PSA quantification results. In addition, we can see the rank of importance among the operator recovery actions in quantitative terms.

Keywords

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Fig. 1. Simplified diagram of containment spray system for the reference NPP.

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Fig. 2. Event tree of small LOCA for the reference NPP.

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Fig. 3. Fault tree of HPSIS injection for the reference NPP.

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Fig. 4. Fault tree of MSO scenario for fire-induced RWT drain down.

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Fig. 5. Fault Tree of MSO scenario for Fire-Induced RWT drain down (recovery)(1/2).

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Fig. 6. Fault Tree of MSO scenario for Fire-Induced RWT drain down (recovery)(2/2).

Table 1. Recovery actions for MSO scenarios for RWT drain down

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Table 2. Quantification results of fire-induced RWT drain down MSO scenario

HOJHB0_2018_v33n6_136_t0002.png 이미지

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