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열성층 현상을 고려한 원전 안전주입계통 배관 열피로 평가
성희동(H.D. Sung),김선혜(S.H. Kim),김익중(I.J. Kim),김영진(Y.J. Kim),장윤석(Y.S. Chang),박정순(J.S. Park),최영환(Y.H. Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In recent years, several piping failures caused by thermal stratification have been reported in some nuclear power plants. However, this kind of thermal fatigue was not considered when the old vintage nuclear power plants were designed. Thermal stratification usually is generated by turbulent penetration from RCS to branch line or leakage through damaged part of valve in branch line. In this research, using CFD analysis, characteristics of thermal stratification in a safety injection system of PWR plant were investigated and thermal fatigue evaluation was also conducted. To do this, first, CFD analyses were carried out on valve isolation model and out-leakage model. As a result, in valve insolation model, thermal stratification generated in front of 1st valve for a moment, however the temperature difference was small. In contrast, significant thermal stratification generated at the rear of 1st valve in out-leakage model. Therefore, thermal stress and fatigue evaluation were carried out based on the temperature result of out-leakage model.