Three-dimensional Monte Carlo neutronic calculations of China ITER HCSB-TBM

Three-dimensional neutronic calculations were conducted to analyze the nuclear performance of the recent China Helium Cooled Solid Breeder (HCSB) test blanket module (TBM) in ITER. The Monte Carlo transport code MCNP was used with the nuclear cross-section data library FENDL/2 offered by IAEA. The analyses were based on a detailed three-dimensional HCSB-TBM geometrical model which was integrated in the ITER 20° global sector model. Key nuclear responses of the HCSB-TBM, such as the tritium generation ratio and the nuclear heating distribution, were calculated and discussed. The total nuclear heating is about 0.505 MW, and the peak heating density which appears in Li4SiO4 is less than 5.5 W/cm3. The tritium production rate is about 13.39 mg/day while considering ITER duty factor of 0.22. The results demonstrate that the current design can meet the engineering requirement from the neutronic point of view.