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Nuclear Science User Facilities 48 The ability to conduct fast neutron irradiation tests is essential to meeting fuels and materials development requirements for future nuclear reactors.At the same time the lack of domestic fast neutron testing capabilities hinders the development of advanced reactors. The concept behind this project is to equip one of the corner lobes of the Advanced Test Reactor ATR with a thermal neutron filter.This material comprised of hafnium-aluminide Al3Hf particles 23 by volume in an aluminum matrix Al3Hf- Al will absorb thermal neutrons and booster fuel augmenting the neutron flux and heat transfer from the experiment to pressurized water cooling channels. Thermal analyses conducted on a candidate configuration confirmed that the design of the water-cooled Al3Hf-Al absorber block is capable of keeping the temperature of all system components below their maximum allowable limits. However the thermo- physical properties of Al3Hf have never been measured nor have the effects of irradiation on these properties ever been determined. It is essential therefore to obtain data on the effects of irradiation including corrosion behavior and radioactive decay products on the thermophysical and mechanical properties of both Al3Hf intermetallic and Al3Hf-Al composite before we can proceed with the design and optimization of the filter. Project Description The purpose of this project is to evaluate the properties and behavior of this new material. Specific objectives are to determine 1. The thermophysical and mechanical properties of Al3Hf in- termetallic and Al3Hf-Al compos- ite at different temperatures. Irradiation Effects on Thermophysical Properties of Hafnium- Aluminide Composite A Concept for Fast Neutron Testing at ATR Heng Ban Utah State University USU heng.banusu.edu Figure 1. Calculated dpa values and total fluence for experiment.