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The comparison between the direct and second side passive residual heat removal system, and system optimized   LYU Xing1, PENG Minjun, and XIA Genglei   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory, Harbin Engineering University, Harbin, Heilongjiang 150001, China (lvxing0616@126.com)   Abstract: The Passive Residual Heat Removal System (PRHRS) is always connected to the steam generator which is designed and prepared for the Station Black-out (SBO) accident. If the PRHRS is required to replace the active residual heat removal system, the system based on the primary loop of PWR would be the better choice. A PRHRS based on the primary loop of PWR (PL-PRHRS) is proposed and analyzed in this paper. Start-up and long-term characteristics of the PL-PRHRS are compared with the PRHRS based on the secondary loop of PWR (SL-PRHRS) by the safety analysis software Relap5/MOD4.0. To optimize the long-term operate performance of PL-PRHRS, a Two Phase Closed Loop Thermosyphon (TPCLT) is introduced to the system and simulated by conjugate boundary method for coupling the system with Relap5/MOD4.0. Results show that the decay heat could be removed continuously from the core in the SBO or other non-LOCA accidents by the PL-PRHRS. Comparing with the SL-PRHRS, the decay heat transfer of PL-PRHRS is established slower, but the decrease of coolant temperature is faster. Although the system could remove the decay heat in the long-term operation, its function is strongly dependent on the water volume in the tank. The introducing of TPCLT reduces the dependence radically so that the volume of the tank could be optimized during the design and higher inherent reliability would be achieved, especially when the tank is shared by other safety systems. Keyword: PL-PRHRS; characteristics comparison; TPCLT; optimize
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