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Nuclear Science User Facilities 62 Low fluence experiments in metallic fuels specifically uranium-zirconium U-Zr and uranium-molybdenum U-Mo types have a relevance to both the Advanced Fuel Cycle Initiative AFCI and the Reduced Enrichment for Research andTest Reactors RERTR program. Quantified findings for the low fluence behavior of metallic fuels will help us understand fuel performance in thermal and irradiation fields. Project Description The objectives of this program are to understand 1 the microstructural evolution of these fuels as a func- tion of temperature fluence and composition and 2 diffusion-related phenomena in the fuels and cladding also as a function of temperature fluence and composition. Findings from these experiments will explain early microstructural development and mechanisms in detail as well as provide critical data for models under development in both programs. Near-term critical results from this project will support AFCI modeling work on constituent redistribution in irradiated uranium-prasecoymium- zirconium U-Pr-Zr fuels that is currently being undertaken by collaborators on this team.These results will also be used to improve the accuracy of computer models in the RERTR program that predict the overall swelling behavior of the fuel. Accomplishments The design of these experiments along with the necessary quality control documents from University of Central Florida UCF researchers and INL scientists was finalized at a meeting at UCF during FY 2014. Meanwhile UCF researchers have continued to pave the way to a better understanding of thermal behavior without irradiation see graphics. Published technical accomplishments from this indepen- dent work are listed below in Publica- tions and Presentations. Future Activities During 2015 work on specimen preparation with alloy casting is planned at INL. Upon receiving the alloys UCF will produce the samples to be inserted into the ATR. UCF will also continue to document the thermal behavior of alloys and diffu- sion couples so that upon completion of ATR experiments the effects of radiation can be elucidated. Low Fluence Behavior of Metallic Fuels Yongho Sohn University of Central Florida UCF yongho.sohnucf.edu Quantified findings of low fluence behavior in metallic fuels will help us understand fuel performance under thermal and irradiation fields.