A Study on Application of Fatigue Correction Factor for Environmental Fatigue Evaluation of Pressurizer Surge Line

가압기 밀림관 환경피로평가를 위한 피로보정계수 적용에 관한 연구

  • 양준석 (한전전력연구원 원자력발전연구소) ;
  • 박치용 (한전전력연구원 원자력발전연구소) ;
  • 강선예 (한국전력기술주식회사 원자로설계개발단)
  • Published : 2009.10.01


Nuclear power plants applying for the continued operation over design life are required to address the effects of reactor water environment in fatigue design requirement of the ASME Code. Reactor water environmental effects are generally evaluated by calculating fatigue correction factors on fatigue usage. This paper describes the application for pressurizer surge line of environmental fatigue correction factors and the strain rate impact in the application. From this paper, the environmental fatigue correction factors resulted from the assumption of a step change in temperature are especially compared with those calculated from the data measured during plant startup. As a conclusion of this paper, the design transient conditions applied to the fatigue design may be conservative in case of the environmental fatigue evaluation.


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