Overall efficiency of air detritiation operations in the fusion reactor containment is affected by several factors, which include conversion of gaseous tritium to tritiated water vapor, sorption by materials such as wall and floor, and consequent desorption from these materials back into the reactor containment. Simulation study of air detritiation systems has been performed by bench-scale experiments and computer modeling. In the case that gaseous tritium is released into the containment, high-temperature metal surface has a significant effect on generating tritiated water vapor and thus generated tritiated water vapor mainly causes the delay of the required operation time. Tritium concentration reduction curves were found to depend on the characteristics of the materials installed in the containment in relation to conversion of HT to HTO at the surface, adsorption/desorption and solution/diffusion. These dependences were also shown by the model calculation.
Tritium management in ITER test blanket systems port cell for maintenance operations