| Summary: | Experimental studies to investigate the behaviors of hydrogen in molten FLiNaK (LiF-NaF-KF) have been conducted at 500–700 °C. On the basis of previous studies, the diffusivity and solubility of hydrogen in FLiNaK have been revised, and the expressions can be correlated to the following Arrhenius equations: DH2 = 1.62 × 10−5exp (−48.20 × 103/Rg·T) [m2/s] and SH2 = 1.03 × 10−4exp (−14.96 × 103/Rg·T) [mol-H2/m3/Pa], respectively. The behavior characteristics of deuterium in FLiNaK were studied and compared with the hydrogen behaviors in FLiNaK. The results showed the behaviors of deuterium were consistence with the behaviors of hydrogen in FLiNaK. The difference between hydrogen and deuterium has not been observed upon the experimental research of the behavior characteristics of hydrogen and deuterium in FLiNaK, which suggested the results obtained here might apply equally to the behavior characteristics of tritium in FLiNaK. Keywords: Hydrogen, Deuterium, Molten FLiNaK, Diffusion, Permeation
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