Three Dimensional Multi-Physics Simulation of Tritium Transport for Tritium Breeder Unit in Helium-Cooled Ceramic Breeder Test Blanket Module of China

China Helium-Cooled Ceramic Breeder Blanket Module(HCCB-TBM) will be installed on International Thermonuclear Experimental Reactor(ITER) to test its tritium breeding performance and thermal removal ability. The tritium transport dynamics in HCCB-TBM is closely linked to fluid heat and mass transfer, hydrogen isotope exchanging, the SORET effect in structure material. In this paper, based on the commercial software COMSOL, a 3-dimensional multi-physics hydrogen isotopes transport analysis is completed with above-mentioned physics considered for HCCB-TBM tritium breeder unit. The calculation results show that hydrogen doped into purge gas benefits to inhibit tritium permeation loss, and it appears a permeation reduction factor of 13.2 with 4.66×10^-2 mol/m³ hydrogen in purge gas flow.