Temperature dependence of hydrogen yields from the radiolysis of reprocessing solutions: The dissolved solution of spent nuclear fuel

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ABSTRACT To assess the temperature dependence of hydrogen yields from the radiolysis of dissolved solution of spent nuclear fuel, experiments were conducted to measure hydrogen yields and calculate dose rates as functions of solution temperature. The results indicated a decrease in G(H2) values with increasing solution temperature under static conditions. Comparison of the experimental values with the simulated values of G(H2) considering the previously reported reactions of hydrogen consumption by a catalytic effect of palladium ions showed a similar pattern of decreasing G(H2) values with increasing temperature. The results suggest that palladium ions have a catalytic effect in the dissolved solution, inhibiting the release of hydrogen produced by radiolysis from the liquid phase to the gas phase. This effect follows the Arrhenius law and increases with increasing solution temperature. On the other hand, the experimental values were lower than the simulated values of G(H2). This discrepancy suggest that the dissolved solution may have another mechanism for hydrogen consumption reactions in addition to a catalytic effect of palladium ions.