This paper discusses the results of a pulsed-flow leaching test using simulated J-13 well water leachant. This test was performed on three blanket fiel segments from the ANL-W EBR-11 nuclear reactor which were originally made up of depleted uranium (DU). This experiment was designed to mimic conditions which would exist it upon disposal of this material in a geological repository, it came in direct contact with groundwater. These segments were contained in pressure vessels and maintained at a constant temperature of 90°C. Weekly aliquots of leachate were taken from the three vessels and replaced with an equal volume of fresh leachant. These weekly aliquots were analyzed for both 90Sr and 137Cs. The results of the pulsed-flow leach test showed the formation of uranium oxide (UOZ) and uranium hydride (UH3) particulate with rapid release of the 137CSand 90Sr to the leachant. On the fifth week of sampling, one of the vessels became over pressurized and vented gas when opened. The most reasonable explanation for the presence of gas in this vessel is that the unoxidized uranium metal in the blanket segment could have reacted with the surrounding water leachant to form hydrogen, However, an investigation is currently being undertaken to both quali@ and quanti& Hz formation during uranium spent nuclear fiel corrosion in water. v vi
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