Earthquakes and Structures

  • 제12권6호
  • /
  • Pages.653-663
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  • 2017
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  • 2092-7614(pISSN)
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  • 2092-7622(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Bayesian-based seismic margin assessment approach: Application to research reactor

  • Kwag, Shinyoung (Research Reactor Mechanical Structure Division, Korea Atomic Energy Research Institute) ;
  • Oh, Jinho (Research Reactor Mechanical Structure Division, Korea Atomic Energy Research Institute) ;
  • Lee, Jong-Min (Research Reactor Mechanical Structure Division, Korea Atomic Energy Research Institute) ;
  • Ryu, Jeong-Soo (Research Reactor Mechanical Structure Division, Korea Atomic Energy Research Institute)
  • 투고 : 2017.01.10
  • 심사 : 2017.06.19
  • 발행 : 2017.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

A seismic margin assessment evaluates how much margin exists for the system under beyond design basis earthquake events. Specifically, the seismic margin for the entire system is evaluated by utilizing a systems analysis based on the sub-system and component seismic fragility data. Each seismic fragility curve is obtained by using empirical, experimental, and/or numerical simulation data. The systems analysis is generally performed by employing a fault tree analysis. However, the current practice has clear limitations in that it cannot deal with the uncertainties of basic components and accommodate the newly observed data. Therefore, in this paper, we present a Bayesian-based seismic margin assessment that is conducted using seismic fragility data and fault tree analysis including Bayesian inference. This proposed approach is first applied to the pooltype nuclear research reactor system for the quantitative evaluation of the seismic margin. The results show that the applied approach can allow updating by considering the newly available data/information at any level of the fault tree, and can identify critical scenarios modified due to new information. Also, given the seismic hazard information, this approach is further extended to the real-time risk evaluation. Thus, the proposed approach can finally be expected to solve the fundamental restrictions of the current method.

키워드

과제정보

연구 과제 주관 기관 : Ministry of Science, and ICT of Korea

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