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2014 ANNUAL REPORT 123 Distributed Partnership at a Glance ATR NSUF and Partners Facilities and Capabilities Idaho National Laboratory AdvancedTest Reactor Center for Advanced Energy Studies Microscopy and Characterization Suite University of Wisconsin Madison PIE facilities Collaborators University of Wisconsin Madison Mahima Gupta principal investigator Janne Parkarinen collaborator Idaho National Laboratory Todd Allen co-principal investigator Jian Gan collaborator Los Alamos National Laboratory Steve Conradson collaborator Future Activities The most important future goal for the project is the full characteriza- tion of -EXAFS data from the FIB UO2 samples. Processing this data has its own challenges due to the lower signal strength microscopic samples emit.Analysis is underway and is to be completed by March 2015. A subsequent ATR NSUF rapid turnaround proposal to continue the research was submitted and accepted. Samples of depleted UO2 were prepared using polishing techniques at CAES and were sent to the University of Wisconsin Madison for proton implantation at its ion beam facility which initiated radiation damage in the 0.20.3 dpa range.The irradiated samples were mounted on specially designed sample holders for local structure and speciation analysis at the Advanced Photon Source.These samples will be used to extract FIB lamellae from the irradiation damage layer and their microstructure evolu- tion will be studied using theTEM at the Microscopy and Characterization Suite at CAES. The goal of this experiment is to bridge the gap between existing information on lattice structure and microstructure evolution under proton irradiation in UO2. Preparation of samples for irradiation at ATR is currently under way.These irradiations will provide a detailed understanding of the evolution of the material struc- ture in UO2 under reactor irradiation. Publications and Presentations 1. M. Gupta 2014 Damage Struc- ture Evolution in Ion Irradiated UO2 TMS conferenceSan DiegoCA February 16202014. 2. M. Gupta 2014 Atomic Struc- ture Evolution in Ion Irradi- ated UO2 presentation for Dr. Franklin Lynn Orr Undersec- retary for Science and Energy May 19th 2014. 3. M. Gupta 2014 Defects in Ion Irradiated UO2 on Multiple Length ScalesATEM and XAFS Study presentation for Dr. Patri- cia Dehmer Deputy Director for Science Programs in the Office of Science Center for Advanced Energy StudiesAugust 12 2014. 4. M. Gupta 2014 Defects in Ion Irradiated UO2 on Multiple Length ScalesATEM and XAFS Study presentation for Dr. Ernest Moniz US Energy Secretary Cen- ter for Advanced Energy Studies Idaho Falls IDAugust 19 2014. 5. M. Gupta S. Conradson J. Pakar- inen andT.Allen 2015 Identi- ficatio3n of Collective Effects in He2 irradiated UO2 via Extend- ed X-ray Absorption Fine Struc- ture Spectroscopy submitted to the Journal of Inorganic Chemistry March 2015.