In a criticality accident, it is known that some kinds ofradiolysis gases are generated mainly due to kineticenergy of fission fragments. Hydrogen gas (H_2) is oneof them, which is able to initiate explosion. The rateof H_2 generation and its total amount can be estimatedfrom the number of fission per second if its G value isknown. In this study, it was tried to estimate G valueof hydrogen gas (G(H_2)) by using the H_2concentration measured as time-series data inTransient Experiment Critical Facility (TRACY)which was carried out by Japan Atomic EnergyAgency. There was time lag in the measured H_2concentration from its generation. To overcome thoseproblems, measured profile of H_2 concentration wasreproduced based on a hypothetical model and itstotal amount was evaluated. Based on the model, theobtained G(H_2) was 1.2.
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