Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2003.04a
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- Pages.1597-1602
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- 2003
An Analysis on Thermal Stratification in Residual Heat Removal System Piping of Nuclear Power Plant
가동원전 잔열제거계통 배관에서의 열성층유동 해석
Abstract
Numerical analysis is carried out to assess the temperature distribution on the mixing tee line of Residual Heat Removal System (RHRS). In RHRS, hot and cold fluids of main and bypass piping are mixed and unmixed by the flow rate or piping layout. Thermal stratification phenomenon is a cause of major degradation on RHRS piping. According to the analysis for each operation modes, maximum temperature difference between top and bottom of piping were evaluated about 60K when the flow rate of main and bypass lines is same. Temperature difference will be decreased at the elbow on RHRS piping if the length of vertical piping is increased.
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