The USU (Utah State University) Advanced Test Reactor Nation Science User Facility (ATR NSUF) experiments to test the performance of hafnium-aluminum composites were conducted in the Advanced Test Reactor (ATR) at Idaho National Laboratory (INL) during cycles 149A through 151A from April 14, 2011, to February 13, 2012. Four sets of two neutron fluence monitor capsules wee irradiated in four different combinations of reactor cycles. The assemblies were irradiated in B2 position of the ATR. Neutron fluence monitors were located at 8 positions in the assemblies. These monitors were previously fabricated at Pacific Northwest National Laboratory (PNNL). After irradiation, the monitors were sent to PNNL for analysis. The measured activation rates were used to adjust the neutron spectra at each location in the assemblies to determine the best fit to the neutron fluence spectra. Radiation damage (dpa) calculations were performed at all locations using the adjusted neutron spectra. Teh report was revised after receipt of corrected irradiation history for Cycle 149A. A plot of the fast neutron flux as a function of height in the B2 position was also added to the report.
