|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization and Modeling of Nuclear Fuels: Microstructure, Thermo-physical Properties
||Comparison of Observations from the Microstructure of Two High Burnup Fuel Samples Operated at Different Linear Heat Generation Rates
||Jason M. Harp, Tyler J. Gerczak
|On-Site Speaker (Planned)
||Jason M. Harp
The formation of high burnup structure and high burnup fuel fragmentation (HBFF) behavior of light water reactor irradiated UO2 fuel is governed in part by the final linear heat generation rate of the fuel. While this behavior is empirically known, the phenomenological mechanism that drives this difference in behavior is still being actively researched. Current understanding of HBFF behavior during LOCA suggests that there are microstructural features that develop at different power conditions that lead to HBFF susceptibility. To better understand these features, microstructural characterization was performed on samples of light water reactor fuel irradiated at different linear heat generation rates above and below the HBFF pulverization threshold established in literature. The data collected during theses exams will be discussed and connected to the current understanding of HBFF available in literature.