大功率压水堆严重事故下IVR-ERVC对裂变产物释放的影响

以大功率非能动压水堆为研究对象,采用MAAP程序研究RCS热管段5 cm小破口始发严重事故下IVR-ERVC对裂变产物释放的影响。结果表明,启动ERVC时安全壳内的Cs I质量份额约0. 29,释放到环境中的惰性气体和Cs I质量份额分别为0. 001 3,1. 95×10^-5,不启动ERVC时安全壳内的Cs I质量份额约为0. 38,释放到环境中的惰性气体和Cs I质量份额分别为0. 94,2. 95×10^-2。大功率非能动压水堆严重事故后启动ERVC,能有效地将熔融物滞留在压力容器内,保持压力容器的完整,降低事故后惰性气体和Cs I向环境的释放量。

The Effect of IVR-ERVC on the Release of Fission Products Under Severe Accident for Large Power PWR

The effect of IVR-ERVC on the release of fission products was studied by MAAP code for the large power passive PWR under severe accident induced by 5 cm small break of the RCS heat pipe.The results indicated that when starting ERVC,29%of CsI released into the containment,and the fraction of inert gas and CsI released into the environment were 0.001 3 and 1.95×10^-5 respectively.About 38%of CsI released into the containment without ERVC,and the fraction of inert gas and CsI released into the environment were 0.94 and 2.95×10^-2 respectively.The ERVC can effectively retain the melt in the reactor pressure vessel,maintain the integrity of the reactor vessel and reduce the release of inert gas and CsI to the environment after the severe accident for large power passive PWR.