PRELIMINARY EVALUATION OF RADWASTE IN FUSION POWER-REACTORS

As a future power producing system, a fusion reactor needs to be super ior in environmental safety and economics aspects. Hence the environme ntal and economic impact of radioactive waste (radwaste) from fusion p ower reactor should be evaluated. The activation level, decay heat, vo lume of radwaste generated during operation and at decommissioning, ar e evaluated for fusion power reactors having five types of structural materials. The structural materials selected are a low activation ferr itic steel F82H, austenitic steel SS 316, TiAl intermetallic compound, SiC/SiC composite with impurities and one without impurities. Possibl e radwaste disposal scenario of fusion radwaste in Japan is considered . It is found that radwaste from fusion reactors using F82H and SiC/Si C composites without impurities could be disposed by the shallow land disposal presently applied to low level waste in Japan. The remaining fusion radwaste which dr, not qualify as the lour level waste could be disposed by geological disposal at tile depth greater than 50 m from the surface.