|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||Microstructure Characterization of TRISO Fuels by Atom Probe Tomography
||Yaqiao Wu, I J van Rooyen, H M Wen, J Burns, J W Madden
|On-Site Speaker (Planned)
The properties and fission product containment of the SiC layer of TRi-ISOtropic (TRISO) coated particle for high temperature gas reactors are studied extensively. Specifically, it is important to understand the transport mechanism of 110mAg through intact SiC layers after neutron irradiation as Ag release is a potential worker safety concern. Our recent studies revealed that nano-sized Ag-rich phases form along grain boundaries and triple-junctions at/near the SiC-IPyC interface by using TEM technique. In this study, APT technique is utilized to characterize surrogate (unirradiated) and irradiated TRISO fuels, to further understand the composition and transport of Ag containing fission products. SiC is an extremely difficult material for the APT technique due to the large difference in evaporation field between C and Si. In addition, the irradiated samples are more challenging due to high number density of defects. Lessons learned to overcome the challenges and the APT results will be described.
||Planned: A print-only volume