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Estimation of hydrogen gas production at transient criticality in uranyl nitrate solution

硝酸ウラニル水溶液の過渡臨界における水素ガス生成量の推定

吉田 涼一朗; 山根 祐一; 阿部 仁

Yoshida, Ryoichiro; Yamane, Yuichi; Abe, Hitoshi

臨界事故では、核分裂生成物の運動エネルギーにより放射線分解ガスが発生することが知られている。水素ガスはそのうちの一つであり、爆発を引き起こす可能性がある。水素のG値が既知であれば核分裂数から水素ガスの発生速度や発生量の合計を評価することができる。本研究では、原子力機構がTRACYを用いて測定した水素濃度の経時変化データからG値を評価することを試みた。水素の発生から水素ガス濃度が測定されるまでタイムラグが見られ、この問題を解決するため、仮想モデルによって測定した水素濃度を再現し、その量を推定した。そこから得られた水素のG値は1.2であった。

In a criticality accident, it is known that some kinds of radiolysis gases are generated mainly due to kinetic energy of fission fragments. Hydrogen gas (H$$_{2}$$) is one of them, which is able to initiate explosion. The rate of H$$_{2}$$ generation and its total amount can be estimated from the number of fission per second if its G value is known. In this study, it was tried to estimate G value of hydrogen gas (G(H$$_{2}$$)) by using the H$$_{2}$$ concentration measured as time-series data in Transient Experiment Critical Facility (TRACY) which was carried out by Japan Atomic Energy Agency. There was time lag in the measured H$$_{2}$$ concentration from its generation. To overcome those problems, measured profile of H$$_{2}$$ concentration was reproduced based on a hypothetical model and its total amount was evaluated. Based on the model, the obtained G(H$$_{2}$$) was 1.2.

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