Research toward safety-oriented fusion DEMO reactor

Nakamura, Makoto; Tobita, Kenji; Tanigawa, Hisashi; Someya, Yoji; Gulden, W.*

The current status of the DEMO safety research is overviewed. We have set the safety requirements and the evaluation guideline for the safety research. The allowable tritium inventory released from the plant, corresponding to the evaluation guideline, has been evaluated. Next we have estimated the amounts of radioactive source terms and energies that can mobilize the source terms. Accident events of particular concern have been selected. Of these events, we have estimated the pressure load on the reactor building and the tritium inventory released to the environment for an ex-vessel loss of coolant accident. It has been found that the effective dose to public at the site boundary due to the tritium release is far below the evaluation guidelines.