Abstract
>A continuous fluidized-bed process for the conversion of uranium/ plutonium nitrates to oxides is under development to facilitate the recycle of plutonium in the nuclear fuel cycle. The basic process consists of two steps, each performed in a separate fluid-bed reactor: (a) codenitration at 375 deg C of uranyl nitrate -plutonium nitrate solutions to a UO/sub 3/ - PuO/sub 2/ powder form, and (b) reduction of the UO/sub 3/-PuO/sub 2/ with hydrogen at 600 deg C to form UO/sub 2/- PuO/sub 2/. Pilot-plant denitration studies with uranyl nitrate- plutonium nitrate solutions containing uranium/plutonium ratios of 50 and 4, and plutonium nitrate solution alone are described, as well as reduction of UO/sub 3/- PuO/sub 2/ powder. Examination of the UO/sub 3/ - PuO/sub 2/ denitration product by autoradiographic and electron microprobe techniques showed that the PuO/sub 2/ was distributed in the UO/sub 3/ matrix with a high degree of homogeneity. The conversion process appears to be applicable over the entire range of uranium-plutonium concentrations and for plutonium nitrate alone. The suitability of this product for the fabrication of fuel pellets is being studied in cooperation with nuclear fuel manufacturers. (auth)
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