Tritium analysis of fusion-based hydrogen production reactor FDS-III

A dynamic subsystem model of tritium fuel cycle for the FDS-III was developed, and the required minimum tritium supply for reactor startup and the doubling time for tritium breeding were calculated by using the Tritium Analysis Software (TAS). Some factors which would affect the tritium supply and doubling time were considered, such as the tritium fractional burnup in the plasma, tritium breeding ratio (TBR), the residence time of tritium in all subsystems, and tritium decay, etc. The results showed that the minimum tritium supply for startup was sensitive with the tritium fractional burnup in the plasma, but the effect of the TBR could be neglected. The double time for tritium breeding strongly depended on the TBR and the tritium fractional burnup. Based on the model, the analysis results predicted that the required initial minimum tritium supply was ∼9.9 kg for startup. After one yearʹs operation, the total tritium inventory in fuel cycle system was ∼33 kg. And the total tritium release into environment was ∼4 mg, which was much lower than the allow level, i.e. 1 g-T/year. The tritium in fuel storage system would be doubled and could be extracted to supply for the other fusion power reactorʹs startup after ∼886 days operation.