Probabilistic safety assessment in the HTTR-IS plant

Kudo, Junichi*; Ohashi, Hirofumi ; Sakaba, Nariaki ; Takahashi, Makoto*; Wakabayashi, Toshio*

Japan Atomic Energy Agency has been developing a nuclear hydrogen production system using the high temperature gas cooled reactor to contribute low carbon society. The High Temperature engineering Test Reactor (HTTR) will be coupled with the hydrogen production plant using the thermochemical IS process, named HTTR-IS plant. The object of this study is to confirm the safety of the HTTR-IS plant using probabilistic safety assessment for toxic material release. The results on the selection of initiating event by using master logic diagram and on the frequency of toxic material release evaluated by the fault tree analysis will be presented.