잔열제거계통 배관에서의 열성층 현상에 관한 연구
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Numerical study is carried out for thermal stratification on residual heat removal piping connected with
RCS piping of NPP. The turbulent penetration length reaches to 1^st isolation valve. Thermal stratification
mainly occurs in the horizontal piping connected with elbow. The maximum temperature difference occurs in
the location where horizontal piping starts passing elbow. The temperature difference between upper and
lower of horizontal piping changes with valve leak, curve radius of elbow, pipe thick and connection of hotleg
injection line. Thermal stratification effect in the backward of 1^st valve is small when piping thick is not
considered and when valve is isolated, but is large when piping thick is considered or when valve leaks.