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김광추(K. C. Kim),박만흥(M. H. Park),염학기(H. K. Youm),김태룡(T. Y. Kim),이선기(S. K. Lee) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Numerical study is carried out for thermal stratification on residual heat removal piping connected with<br/> RCS piping of NPP. The turbulent penetration length reaches to 1^st isolation valve. Thermal stratification<br/> mainly occurs in the horizontal piping connected with elbow. The maximum temperature difference occurs in<br/> the location where horizontal piping starts passing elbow. The temperature difference between upper and<br/> lower of horizontal piping changes with valve leak, curve radius of elbow, pipe thick and connection of hotleg<br/> injection line. Thermal stratification effect in the backward of 1^st valve is small when piping thick is not<br/> considered and when valve is isolated, but is large when piping thick is considered or when valve leaks.
원전 안전주입 배관에서의 In-Leakage 에 의한 열성층 현상에 관한 연구
김광추(K. C. Kim),박만흥(M. H. Park),염학기(H. K. Youm),김태룡(T. Y. Kim),이선기(S. K. Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In case that in-leakage through the valve disk occurs, a numerical study is performed to estimate on<br/> thermal stratification phenomenon in the Safety Injection piping connected with the Reactor Coolant System<br/> piping of Nuclear Power Plant. As the leakage flow rate increases, the temperature difference between top and<br/> bottom of horizontal piping has the inflection point. In the connection point of valve and piping, the<br/> maximum temperature difference between top and bottom was 185K and occurred in the condition of 10<br/> times of standard leakage flow rate. In the connection point of elbow and horizontal piping, the maximum<br/> temperature difference was 145K and occurred in the condition of 15 times of standard leakage flow rate. In<br/> the vertical piping of Safety Injection piping, the near of connection point between elbow and vertical piping<br/> showed the outstanding thermal stratification phenomenon in comparison with another region because of<br/> turbulent penetration from Reactor Coolant System piping. In order to prevent damage of piping due to the<br/> thermal stratification when in-leakage through the valve disk occurs, the connection points between valve and<br/> piping, and the connection points between elbow and piping need to be inspected continually.
박만홍(M. H. Park),김광추(K. C. Kim),김경훈(K. H. Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
Numerical analysis is carried out to assess the temperature distribution on the mixing tee line of Residual<br/> Heat Removal System (RHRS). In RHRS, hot and cold fluids of main and bypass piping are mixed and<br/> unmixed by the flow rate or piping layout. Thermal stratification phenomenon is a cause of major degradation<br/> on RHRS piping. According to the analysis for each operation modes, maximum temperature difference<br/> between top and bottom of piping were evaluated about 60K when the flow rate of main and bypass lines is<br/> same. Temperature difference will be decreased at the elbow on RHRS piping if the length of vertical piping<br/> is increased.