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The study on the flashing induced instability in an open loop natural circulation system using RELAP5/Mod3.3   LI Jun1.2, and LI Xiaoming1, 2   1. Fundamental Science on Nuclear Safety and Simulation Technology Laboratory,  Harbin Engineering University, Harbin, 150001，China (lijun@hpr.com.cn) 2. China Nuclear Power Engineering, Beijing, 100840, China   Abstract: A numerical study on the operating process of a conceptual passive containment cooling system along with the instability for the simplified natural circulation system is carried out using the system code of RELAP5/Mod3.3. The sensitivity studies of spatial mesh and time step are performed. The feature of the instability occurring in the system is identified as flashing induced and dominated instability. The steady operating point of the natural circulation system is determined by using RELAP5/Mod3.3 under different heat flux and inlet temperature conditions. The characteristics of the steady operating point and the relationship between driving force and resistant force are used to analyze the onset of instability for the natural circulation. Key words: natural circulation; open loop;flashing induced instability
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