FUEL MATERIALSDOE-HDBK-1017/2-93Plant MaterialsThe physical properties of the fuel material are primarily of interest in ensuring its integrityduring the manufacturing process. Nevertheless they must be considered in assessments of theintegrity of the core under operating conditions, or the conditions of hypothetical accidents. Thephysical and mechanical properties should also permit economical manufacturing. The fuelmaterial should have a low coefficient of expansion.It is not possible to fabricate typical refractory ceramics to 100% of their theoretical density.Therefore, methods of controlling the porosity of the final product must be considered. The roleof this initial porosity as sites for fission gas, as well as its effects on thermal conductivity andmechanical strength, is a significant factor in the design.SummaryThe important information in this chapter is summarized below.Fuel Materials SummaryRadioactive materials suitable for fission by thermal neutrons and used as reactorfuel include: 233U and 235U239Pu and 241PuConsiderations in selecting fuel material are:High thermal conductivity so that high power can be attained withoutexcessive fuel temperature gradientsResistance to radiation damage so that physical properties are not degradedChemical stability with respect to coolant in case of cladding failurePhysical and mechanical properties that permit economical fabricationMS-05Page 10Rev. 0
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