Abstract: A plate-shaped high power nuclear fuel element containing low enrichment uranium (5 to 20 percent by weight uranium.sup.235 in the uranium component) as fissionable material, the fuel element essentially comprising a UAl.sub.4 plate provided with an aluminum sheath or a sheath of an Al alloy and impurities inherent in the manufacturing process. A process for producing such a UAl.sub.4 plate comprises (a) intimately mixing a powder of low enrichment uranium or uranium compound U.sub.6 Fe (5 to 20 percent by weight U.sup.235) having a particle size in the range from 0.1.mu. to 90.mu. with aluminum powder having a particle size in the range from 0.1.mu. to 100.mu. in a weight ratio range of uranium to aluminum between 1.1 U:1 Al and 2.

Abstract: A method for producing a molded body containing highly radioactive wastes. The wastes are mixed with molten glass or are melted together with glass formers, and converted into glass granules or glass powder. These granules or powder are mixed with a metal powder containing at least one of the metals lead, iron, silver, cobalt, nickel and tin, and the mixture is condensed at pressures of 25 to 500 Newtons/mm.sup.2 to form a molded body.