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Nuclear Science User Facilities 84 Figure 2. LEAP results showing the distribution of elements in a tip fabricated from a neutron-irradiated TRISO fuel particle. still limited and no FP were detected. Therefore in the third phase of this study ten tips were fabricated at the University ofWisconsin Madison from a surrogate Ag ion-implanted SiC sample and shipped to CAES for LEAP examinations. Compared with the neutron-irradiated samples the surrogate tips were far less prone to fracture and data was obtained from depths of up to 240 nm. However no Ag was detected Figure 3. It was concluded that LEAP examina- tion of SiC is limited by the relatively low electrical and thermal conductivity Various fission products found in the SiC layer of a neutron-irradiated TRISO fuel particle have improved our understanding of the fission product release mechanisms in this type of fuel. of this material as well as its brittle- ness which is exacerbated by radia- tion-induced defects. More extensive research is needed to exploit the full benefits of the LEAP technique for the examination of irradiated SiC samples. Future Activities This project has been completed. References 1. I. J. van RooyenY. Q.WuT. M. Lillo 2014 Identification of silver and palladium in irradi- atedTRISO coated particles of the AGR-1 experiment Journal of Nuclear Materials 446 pp. 178186. Publications and Presentations 1. I.van Rooyen B. LengY.WuT. Lillo I. Szlufarska K. Sridharan T. Gerczak J. Madden 2014 Identification of Fission Products in irradiated SiC Using Scanning Transmission Electron Microscopy and Atom ProbeTomography ATR NSUF UsersWeek. 2. B. Leng I. van RooyenY.Wu I. Szlufarska K. Sridharan 2015 STEM-EDS analysis of fission products in neutron-irradiated TRISO fuel particles from AGR-1 experiment submitted to the Journal of Nuclear Materials.