In its elevated-temperature critical-assembly experiments, the University of California Radiation Laboratory, Livermore, will utilize stainless-steel-clad fuel elements. The fuel element consists of 0.001- or 0.002-in. thick enriched-uranium foil packaged in a welded 0.002-in. thick type-347 stainless-steel envelope. The design requirements for the fuel elements are stated, as are the considerations which led to the design selected. Beta heat treatment of the uranium was found necessary to provide compatible thermal-expansion characteristics for the two materials in the fuel element.