Abstract
A multiregion fuel element is described that can be designed to take advantage of the high density and high thermal conductivity of the metal as well as of the high operating temperature of the oxide. This is accomplished by using a rod-shaped element having an outer annulus of metal and a central core of oxide. Che discussion is limited to metallic uranium and uranium oxide; however, the same principles apply to various uranium alloys and refractory uranium compounds. Preliminary evaluation of the following four types of fuel elements was made: solid metallic uranium rods, solid uranium oxide rods, cored metallic uranium rods, and multiregion metallic uraniumuranium oxide rods. The evaluation resulted in a conclusion that the multiregion fuel element provdes improved performance over the other elements by permitting 20% increase in power generation, 25% increase in burnup, and 1% increase in reactivity. (N.W.R.)
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