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Abstract Used nuclear fuel (UNF) is a chemically diverse and radiologically hazardous material, though rather than classify it as a waste product, reprocessing seeks to extract one or more of its rare and valuable components. Beyond recoverable fuel materials, UNF contains radioisotopes necessary for theragnostic medicine, radio thermal generators, and stable rare-earth and noble metal elements.
The structural chemistry of elements relevant to the FLiBe molten salt reactor, Th, U, Np, and Zr, including Ce and Nd (as analogues for Pu and Am, respectively), have been examined using hydrothermal synthesis at 200 °C. These reactions serve to model the reaction of molten salts under hydrolysis conditions. The results show that U and Np formed LiAnF5, while Ce formed Li4CeF8.
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