|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||The Influence Irradiation Conditions on the Microstructural Evolution of Irradiated U-Mo Fuels
||Charlyne Smith, Dennis Keiser, Brandon Miller, Assel Aitkaliyeva
|On-Site Speaker (Planned)
Fission gas accumulation, and its eventual release, are one of the main causes of failure observed in irradiated U-Mo fuels. This work reports the impact of irradiation conditions on the microstructural behavior of two U-7wt%Mo dispersion fuel mini-plates. These two mini-plates were irradiated to similar conditions, with the exception of two parameters: fission power and U-235 burnup. Our data show that these irradiation conditions can significantly influence fuel recrystallization, creep, and pore size distribution. As expected, higher fission rate and burnup result in higher porosity and fuel recrystallization behavior. Both plates showed evidence of pore interconnection, which indicates that fission gas release may occur as early as 4.45×1021 fiss/cm3. Various image analysis tools were implemented to extract additional information, such as eccentricity, and correlate it to the stress-induced creep of the fuel plates.