Waste management scenario in hot cell for DEMO

Someya, Yoji; Tobita, Kenji; Kondo, Masatoshi*; Ueno, Kenichi; Yanagihara, Satoshi*; Matsuda, Shinzaburo*; Hatano, Yuji*; Masuzaki, Suguru*; Kato, Takashi*; Uto, Hiroyasu; Asakura, Nobuyuki; Hoshino, Kazuo; Nakamura, Makoto; Sakamoto, Yoshiteru

In the replacement period of a fusion power reactor, blanket and divertor modules should be removed from the reactor as an assembly for plant availability. It is assumed that the sector assembly is changed over at every two years during the operation. In the hot cell, the modules will be removed from the back plate of the assembly. Since the back plate made of F82H can be reused, the decay heat must be removed using active cooling to keep the temperature below 550 C for structural strength of F82H. At the same time, the active cooling must not cause a contamination of the hot cell environment due to dispersion of tritium and tungsten dust. The cooling scenario is one of key points in the waste management. The problem is the space for storage. Breaking up the F82H into small pieces reduces the volume of the waste, contributing to a reduction of the storage space.