关键词: CFETR, 氦冷固态包层, 多物理场, 氚输运

Abstract: The multi-physics field analysis of blanket heat, flow and tritium transport for the outboard 
midplane Helium Coolant Ceramic Breeder (HCCB) blanket module of China Fusion Engineering Test Reactor 
(CFETR) is carried out, the tritium concentration profile and tritium inventory in blanket module, and the tritium 
permeation loss are obtained. Moreover, the simulation result shows that there is no purge gas stagnation in pebble 
beds, which may cause tritium detention, and the design of purge gas flow is rather reasonable. At the same time, 
a parameter sensitivity analysis of doped hydrogen concentration in inlet purge gas is carried out. The analysis 
shows that hydrogen concentration in purge gas reduces the tritium concentration on material surface, thereby the 
gradient of tritium concentration in structure material is flattened and tritium permeation is suppressed. When the 
inlet hydrogen concentration increased from 1ppm to 1000ppm, the amount of tritium permeation is reduced about 
20 times. 

Key words: CFETR, HCCB blanket, Multi-physical field, Tritium transport