Safety research on fusion DEMO in Japan; Toward development of safety strategy of a water-cooled DEMO

Nakamura, Makoto; Tobita, Kenji; Someya, Yoji; Uto, Hiroyasu; Sakamoto, Yoshiteru; Gulden, W.*

This paper presents recent progress in the safety research on fusion DEMO in Japan. In particular, reported here are analysis of accident scenarios and the resulting consequences, and development of safety strategy against the accidents. We have analyzed thermohydraulic responses of the DEMO systems to various accident situations, and the loads to the confinement barriers were evaluated for such accident situations. On the basis of the results, a safety strategy to confine radioactive materials and mitigate consequences were elaborated.