Patent Number: 
Section: claims

1. A fast reactor nuclear fuel element comprising:a metallic fuel slug,the fuel slug consisting essentially of a uranium (U) and zirconium (Zr) alloy; a protective coating layer of an oxide layer,the protective coating layer is coated on a surface of the fuel slug, which causesthe fuel slug to be coated with a single protective coating layer of an oxide layer,the single protective coating layer is formed by oxidation of the fuel slug, thickness of the single protective coating layer is in a range of 0.5 μm to 100 μm, andthe single protective coating layer is preformed on the fuel slug surface prior to fuel slug usage in a fast reactor,the single protective coating layer is configured to prevent interdiffusion between the fuel slug and a cladding tube, to prevent the cladding tube from thinning during fission operation in the fast reactor. 2. A nuclear fuel rod configured for use with a fast reactor comprising:a fast reactor nuclear fuel element of claim 1; anda cladding tube sealing the metal fuel slug. 3. The nuclear fuel rod as set forth in claim 2, wherein the cladding tube comprises one or more selected from the group consisting of iron (Fe), chromium (Cr), tungsten (W), molybdenum (Mo), vanadium (V), titanium (Ti), niobium (Nb), tantalum (Ta), silicon (Si), manganese (Mn), nickel (Ni), carbon (C), nitrogen (N), and boron (B).