Development of Materials for Fast Reactor Fuel Assemblies

Abstract

For fast reactors to be economically competitive with thermal reactors, incremental costs associated with construction must be regained by the fuel cycle. This can be accomplished either by reprocessing fuel or by extending its core residency period. Consideration is given to a means for extending fast reactor fuel element life. In particular, fuel element structural materials can be made more resistant to effects of the severe fast reactor core environment. High operating temperature and fast neutron flux alter the mechanical and physical properties of these materials, and fuel element integrity can be significantly compromised as a result. Thermal and irradiation processes adversely affecting fuel element materials are examined, along with the results of U.S. Department of Energy development efforts aimed at mitigating or eliminating these effects.