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Report No.

Studies on tritium breeding ratio for solid breeder blanket cooled by pressurized water through nuclear and thermal analyses

Seki, Yohji; Tanigawa, Hisashi; Tsuru, Daigo; Enoeda, Mikio; Akiba, Masato; Ezato, Koichiro; Tanzawa, Sadamitsu; Nishi, Hiroshi; Hirose, Takanori; Homma, Takashi; Mori, Kensuke; Yokoyama, Kenji

This report is result of one-dimensional nuclear and thermal analyses on Test Blanket Module (TBM) for ITER emphasizing on optimized layer structures of a ceramic tritium breeder ($$Li_{2}TiO_{3}$$) and a beryllium neutron multiplier $$Be$$. Taking into account increment of Tritium Breeding Ratio (TBR), the radial widths of the breeder and multiplier layers are optimized. The main results of our study are as follows: (1) In multilayered structures of pebble beds, the peak of the TBR exists within the range of the volume ratio $$R = V(Be) / V(Li_{2}TiO_{3}) = 4 - 5.$$ (2) In the case of the single packing, the R stayed in the range of $$4 - 5$$ by setting the two layers of Be behind a layer of $$Li_{2}TiO_{3}$$. This database of TBR for optimized layer structures contributes to the estimation of TBR at the design stage of the TBM and demonstration blanket.



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