[en] Graphite casting scrap, fuel elements and nongraphite combustibles are calcined to impure oxides. These materials along with zircaloy fuel elements and refractory solids are leach-dissolved separately in HF-HNO₃ acid to solubilize the contained enriched uranium. The resulting slurry is filtered and the clear filtrate (to which mineral acid solutions bearing enriched uranium may be added) are passed through solvent extraction. The solvent extraction product is filtered, precipitated with H₂O₂ and the precipitate calcined to U₃O₈. Metal is made from U₃O₈ by conversion to UO₂, hydrofluorination and reduction to metal. Throughput is 150 to 900 kg uranium per year depending on the type of scrap