A complex alloy of uranium with zirconium, niobium, molybdenum, ruthenium, and palladium (uranium-fissium) was prepared by induction comelting and casting. Alloying with plutonium and cerium was also studied. Good recoveries of the alloying elements in homogeneous ingots was achieved. The techniques established by this study are being used to prepare the core material for EBR-II.