Blanket material and technology developments toward DEMO under the Broader Approach framework

Nishitani, Takeo; Yamanishi, Toshihiko; Tanigawa, Hiroyasu; Nakamichi, Masaru; Nozawa, Takashi; Hoshino, Tsuyoshi; Ochiai, Kentaro

On the Broader Approach framework, R&D on the blanket related materials and technologies have been carried out between the EU and Japan. Those activities are implemented mainly at the Rokkasho BA site in Japan. In the R&D on SiC/SiC composites for an advanced blanket material, CVI-SiC/SiC composites have been obtained in high temperature vacuum environment up to 1000C. As the R&D on the tritium technology, tritium retention of the fine-grained re-crystallized tungsten has been evaluated. On reduced activation ferritic/martensitic (RAFM) steels as the blanket structural material, 20-ton heat of the F82H RAFM steel has been successfully conducted by an electric arc furnace. Advanced neutron multiplier pebbles of beryllide have been fabricated with dedicated rotating electrode apparatus followed by annealing. Also advance tritium breeder has been fabricated by an emulsion method, where the grain size is confirmed by the SEM to be smaller than 5 -m.