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〈응용논문〉 : 가압기 밀림배관에 대한 환경피로계수 감소 방안 고찰
강선예(Sun-Yeh Kang),김규완(Kyu-Wan Kim),송민섭(Min-Sup Song),양준석(Jun-Seog Yang),윤기석(Ki-Seok Yoon),최택상(Taek-Sang Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
가동원전을 계속운전하기 위한 심사시 규제기관에서는 NUREG/CR-6260에 기술된 위치를 포함한 피로취약 부위에 대해 원자로냉각재 환경을 고려한 피로평가를 수행할 것을 요구하고 있다. 가압기 밀림관은 환경피로평가결과 ASME 허용값을 만족시키기 어려운 부위중 하나이다. 밀림관에서 환경보정계수값은 최대 15.35까지 계산되므로 환경피로계수는 ASME Code 허용값(1.0)을 초과할 수 있다. 본 논문에서는 NUREG/CR-5704에 기술된 방법을 적용한 환경보정계수 계산 방법론, 가동원전 WEC형 가압기 밀림관 용접부에 대해 보수적인 피로해석 방법론을 적용한 환경피로계수 계산, ASME Code 요건을 만족시키기 위한 환경피로계수 감소 방안에 대해 논의하였다. 결론적으로, 본 논문에서 제안한 환경피로 계수 감소방안을 적용할 경우 가동원전 WEC형 가압기 밀림관 용접부의 환경피로계수는 크게 감소하는 것으로 평가되었다. For the plant life extension, the regulatory body requires the assessing of reactor coolant environmental impact on a critical components that includes, as a minimum, those selected in NUREG/CR-6260. The pressurizer surge line is the most difficult to meet the ASME code limit for fatigue evaluations considering the effects of LWR environments. The environmental usage factor values can exceed allowable limit(1.0) of the ASME Code because the cumulative usage factor increase by a factor of maximum 15.35. This paper describes Methodology of the environmental correction factor calculation using the method described in NUREG/CR-5704, the calculation of environmental fatigue usage factor based on a conservative approach for ASME fatigue evaluation, and five(5) proposed schemes to reduce the environmental CUF to below the ASME Code limit. Finally, the environmental CUF at WEC Type surge line welding locations could be reduced considerably by using the proposed schemes.
국제공동연구 PARTRIDGE를 통한 확률론적 건전성 평가 기술 개발 현황
김선혜,박정순,김진수,이진호,윤은섭,양준석,이재곤,박홍선,오영진,강선예,윤기석,박재학,Kim, Sun Hye,Park, Jung Soon,Kim, Jin Su,Lee, Jin Ho,Yun, Eun Sub,Yang, Jun Seog,Lee, Jae Gon,Park, Hong Sun,Oh, Young Jin,Kang, Sun Yeh,Yoon, Ki Seok,P 한국압력기기공학회 2013 한국압력기기공학회 논문집 Vol.9 No.1
A probabilistic assessment code, PRO-LOCA ver. 3.7 which was developed in an international co-operative research program, PARTRIDGE was evaluated by conducting sensitivity analysis. The effect of some variables such as simulation methods (adaptive sampling, iteration numbers, weld residual stress model), crack features(Poisson's arrival rate, maximum numbers of cracks, initial flaw size, fabrication flaws), operating and loading conditions(temperature, primary bending stress, earthquake strength and frequency), and inspection model(inspection intervals, detectable leak rate) on the failure probabilities of a surge line nozzle was investigated. The results of sensitivity analysis shows the remaining problems of the PRO-LOCA code such as the instability of adaptive sampling and unexpected trend of failure probabilities at an early stage.