Research on the control of containment pressure of Gen II+ NPP under severe accident condition

As the last safety barrier, containment plays an important role inbounding fission products and protecting public and environment from the harm of radiation under accidental conditions. In this paper, the model of Gen II+ NPP, Tianwan Unit 5&6, was set up by modular severe accident analysis code, systems for controlling of containment pressure were considered, and the variation of containment pressure under typical accident sequences was analyzed, finally the methods on control of containment pressure under severe accident were gained. The results can be used for the mitigation of severe accident happening in Gen II+ NPP.