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概要

Urgent safety countermeasures immediately have been performed for Hamaoka NPP based on the accident of Fukushima Daiichi NPP caused by the Pacific coast of Tohoku Earthquake (March 11, 2011). And those countermeasures which increase the safety against tsunami attack was released in July of the same year. Moreover, the countermeasures against severe accident including installation of Filtered containment venting system are released in December, 2012, and the safety is further increased. Filtered venting system (1) prevents the failure by the overpressure of primary containment vessel as alternative heat removal measure, if RHR system lost, (2) reduces the amount of fission product into environment by the release through Filter equipment. This paper describes about the design plan which took into consideration the application of FCVS to Hamaoka NPP Unit 4 as one of the countermeasures of severe accident management.

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