Proceedings of the Korean Nuclear Society Conference (한국원자력학회:학술대회논문집)

Korean Nuclear Society (한국원자력학회)
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A Risk Informed Approach to Relax AOTs and STIs in Technical Specifications

  • Cho, Sung-Hwan (Korea Electric Power Research Institute nuclear Power Generation Laboratory) ;
  • Park, Byoung-Chul (Korea Electric Power Research Institute nuclear Power Generation Laboratory) ;
  • Seo, Mi-Ro (Korea Electric Power Research Institute nuclear Power Generation Laboratory)
  • Published : 1998.05.01
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Abstract

A risk informed approach to relax AOTs and STIs of RPS/ESPAS in technical specifications of kori units 3, 4 was performed in this paper. With the proposed AOTs and STIs, system unavailabilities and core damage frequency were quantified using PSA model. The results shoe that core damage frequency is slightly increased by extending AOTs and STIs but negligible. As considering the benefits such as reduction of plant transients and man power for test and maintenance, the relaxation of AOTs/STIs of RPS/ESFAS is justified

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