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Report No.

Source term analysis with containment filtered vent system

Yoshimoto, Tatsuya*; Ishikawa, Jun ; Okamoto, Koji*; Maruyama, Yu 

Containment Filtered Vent System (CFVS) can prevent the containment vessel failure and reduce the release amount of fission products to the environment. After the Fukushima Daiichi Nuclear Power Plant (NPP) accident, Nuclear Regulation Authority of Japan required licensees to introduce CFVS in all BWR plant in Japan to re-operate nuclear power plant. In this paper, a CFVS model was constructed and the impact of CFVS on source term during a severe accident was analyzed. A main objective in this analysis is to understand potential effect of CFVS on source terms. A series of calculations has been performed for a BWR with Mark-I containment vessel (CV) at present by considering only scrubbing efficiency in a water pool using THALES2 code. A severe accident initiated by station blackout is taken to be analyzed, which is similar with the accident at the Fukushima Daiichi NPP. Four cases; drywell CFVS case, wet well (W/W) CFVS case, W/W direct release case and CV failure case, are analyzed.



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