Shutdown dose rate analysis in transportation of Japanese TBM

Sato, Satoshi; Ochiai, Kentaro; Konno, Chikara  ; Tanigawa, Hisashi; Hirose, Takanori; Enoeda, Mikio

Shutdown dose rates have been calculated for the ITER JA Water-Cooled Ceramic Breeder Test Blanket Module (WCCB-TBM) port using the partial model. The "Direct 1-Step Monte Carlo" (D1S) method is adopted for the decay -ray dose rate calculation. The decay photons are emitted from only TBM and we calculate the shutdown dose rates due to decay photons from the only TBM. Dose rates in front of the TBM in 1 month, 1 year and 1.5 year after irradiation are 300, 100 and 70 Sv/h, respectively, and they are too high. Dose rates behind the TBM in 1 month, 1 year and 1.5 year after irradiation are 5, 1 and 0.6 Sv/h, respectively, and they are also high. In future, nuclear analyses will be performed using the ITER global model.