NUMERICAL INVESTIGATION ON THERMAL STRATIFICATION PHENOMENON IN A SHUTDOWN COOLING SYSTEM PIPING
Several piping failures caused by thermal stratification have been reported in several nuclear power plants since the early 1980s. However, this kind of thermal effect was not considered when the old vintage nuclear power plants were designed. Therefore, additionally, it is necessary to evaluate this unexpected thermal effect on structural integrity. Thermally stratified flow is usually generated by turbulent penetration from reactor coolant system to branch line or leakage through a damaged part of valve in branch line. In this paper, the characteristic of thermal stratification in a shutdown cooling system of pressurized water reactor (PWR) plant were investigated by using numerical method. First, CFD analyses were carried out considering in-leakage. Especially, the temperature distribution along the shutdown cooling system piping was simultaneously calculated based on conjugate heat transfer condition. Finally, thermal stress caused by stratified flow in piping was evaluated based on one-way sequential coupling method. This approach can reduce the effort to calculate heat transfer coefficient and lead more realistic and accurate results.
Sun-Hye Kim Hee-Dong Sung Young-Jin Kim Jung-Soon Park Young-Hwan Choi
School of Mechanical Engineering,Sungkyunkwan University, Suwon 440-746 Republic of Korea Korea Institute of Nuclear Safety, Daejeon 305-338 Republic of Korea Korea Institute of Nuclear Safety,Daejeon 305-338 Republic of Korea
国际会议
2nd International Conference on Computational Methods for Thermal Problems(第二届热问题计算方法国际会议)
大连
英文
271-274
2011-09-05（万方平台首次上网日期，不代表论文的发表时间）