원전 안전주입 배관에서의 In-Leakage 에 의한 열성층 현상에 관한 연구
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In case that in-leakage through the valve disk occurs, a numerical study is performed to estimate on
thermal stratification phenomenon in the Safety Injection piping connected with the Reactor Coolant System
piping of Nuclear Power Plant. As the leakage flow rate increases, the temperature difference between top and
bottom of horizontal piping has the inflection point. In the connection point of valve and piping, the
maximum temperature difference between top and bottom was 185K and occurred in the condition of 10
times of standard leakage flow rate. In the connection point of elbow and horizontal piping, the maximum
temperature difference was 145K and occurred in the condition of 15 times of standard leakage flow rate. In
the vertical piping of Safety Injection piping, the near of connection point between elbow and vertical piping
showed the outstanding thermal stratification phenomenon in comparison with another region because of
turbulent penetration from Reactor Coolant System piping. In order to prevent damage of piping due to the
thermal stratification when in-leakage through the valve disk occurs, the connection points between valve and
piping, and the connection points between elbow and piping need to be inspected continually.