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RISS 인기검색어
- 검색키워드
- 저자 : 김태룡(T. Y. Kim) (검색결과 4 건)
- 무료
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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.
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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.
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밸브누설이 존재하는 안전주입계통배관에서의 열성층 유동해석
박만흥(M.H.Park),김광추(K.K.Kim),김태룡(T.Y.Kim),이선기(S.K Lee),김경훈(K.Y. Kim) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
A numerical analysis has been performed to estimate the effect of thermal stratification in the safety<br/> injection system piping lines. This phenomenon of thermal stratification is usually observed in the piping<br/> lines of the safety injection system that is connected high pressure and high temperature system as well<br/> as this system is isolated by isolation valve normally.<br/> This piping lines may be identified as the source of fatigue in the piping system due to the thermal<br/> stress loading which are associated with plant operating modes. The turbulent penetration length,<br/> generally, reaches to 1^st isolation valve in safety injection system piping from reactor coolant system at<br/> normal power operation when a high temperature coolant does not leak out through 1^st isolation valve. At<br/> that time, therefore, the thermal stratification does not appear in the piping between RCS piping and 1^st<br/> isolation valve of safety injection system piping.<br/> When a high temperature coolant leak out through the 1^st isolation valve by any damage of isolation<br/> valve, however, the thermal stratification can occur in the safety injection system piping. At that top and<br/> bottom leakage, the maximum temperature difference of fluid between top and bottom in the piping is,<br/> respectively, estimated about 20 and 27℃. But the thermal load and potential for branch pipes is<br/> considered insignificant, since the maximum temperature difference is less than 27.8℃(maximum<br/> potential temperature difference). Therefore, it is considered that this will be ignored the effect of thermal<br/> stratification in safety injection system piping with valve leakage.
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