Abstract
The mechanism of the change of tritium chemical species from T + to HT in Flibe (Li 2BeF 4) a potential liquid tritium breeding material under He + H 2 purge gas was investigated by an in situ tritium release experiment. In case of low H 2 partial pressure, the temporal change in HT release rate from Flibe has a dependence on the H 2 partial pressure. The concentrations of four kinds of species, T +, HT, H 2 and H + dissolved in Flibe control the rate of the change of the tritium chemical species in Flibe. It is considered that, at the steady-state in the case of low H 2 partial pressure, TF becomes the main chemical form of released tritium by decreasing the rate of the change of the tritium chemical species, which is caused mainly by the decrease of H 2 concentration in Flibe. This decrease of H 2 concentration is considered to be much larger in an actual blanket.
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