Abstract
Uranium metal corrosion products involved in a recent pyrophoric event were characterized using thermo-gravimetric analysis, X-ray diffraction, and BET gas sorption techniques to determine the effects of passivation treatment and long-term storage on chemical reactivity. Characterization was performed on corrosion products in three different conditions: immediately after separation from the source metal, after low-temperature passivation, and after passivation and extended vault storage. The hydride fraction and ignition temperature of the corrosion products were found to be strongly dependent on the corrosion extent of the source metal. There was little change in corrosion product properties resulting from low-temperature passivation or vault storage. The results indicate that the energy source for the pyrophoric event was a considerable quantity of uranium hydride present in the corrosion products, but the specific ignition mechanism could not be identified.
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