Add time:08/29/2019         Source:sciencedirect.com

The formation of uranium hydride (UH3) during storage of uranium metal poses a hazard owing to its potentially pyrophoric behaviour that affects handling procedures during uranium storage, decommissioning legacy facilities and waste immobilisation. Partial oxidation of UH3 by water significantly reduces its reactivity, which impacts on safety assessments. New measurements of the rate of UH3 hydrolysis are presented for a range of hydrolysis temperatures, UH3 preparation temperatures and under both aqueous and water vapour conditions. The hydrolysis reaction has an initial rapid phase, characterised by consumption of at least 5% of the UH3 and a rapid decrease in the reaction rate. During the second stage of the reaction the reaction rate decreases more slowly with reaction extent and depends strongly on the temperature at which the UH3 was prepared. Evidence suggests that this is, at least in part, caused by the faster reaction of α-UH3 compared with β-UH3. In the final phase the reaction rate decreases to a very low value at 70%–90% reaction extent. The dependence of the reaction kinetics on the temperature of UH3 formation has significant implications for predicting the ignition properties of UH3 and its stability during storage and handling.

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