Nuclear Science User Facilities 80 Distributed Partnership at a Glance NSUF and Partners Facilities and Capabilities Center for Advanced Energy Studies Microscopy and Characterization Suite Collaborators Idaho National Laboratory Isabella J van Rooyen (co-principal investigator) Idaho State University Haiming Wen (principal investigator) structure, however, they may have slightly different orientation and/ or dislocation density.The contrast in the precipitate in the STEM image is uniform and EDS point‑scan results indicate that this precipitate is rich in Pd, with a U concentration. STEM, EDS,TEM, and HRTEM results on another fission product precipitate are displayed in Figure 4. In the STEM image, the precipitate has uniform contrast.The EDS results indicate that the precipitate is rich in Pd. Note that the Cu concentration is from the TEM grid. Multiple EDS point scans indicate that there are variations in Pd concentration across the precipitate. Similarly, in TEM and HRTEM images, there are contrast variations among different parts of the precipitate. From HRTEM images, the precipitate appears to have a face centered cubic structure and different parts of the precipitate have the same structure. The contrast variations may be caused by variations in Pd concentration and by slightly different orientation and/ or dislocation density. Future Activities This project is now complete. Publications [1.] Haiming Wen, Isabella J. van Rooyen, “Advanced electron microscopy study of fission products in aTRISO coated particle neutron irradiated to 3.6 × 1021 n/cm2 fast fluence at 1040°C,” International Conference on Nuclear Materials 2017, June 25-26, Paris, France, accepted. [2.] Haiming Wen, Isabella J. van Rooyen, “Distribution, composi- tion and structure of fission prod- ucts in aTRISO coated particle neutron irradiated to 3.6 × 1021 n/cm2 fast fluence at 1040°C,” journal paper in preparation