|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials and Fuels for the Current and Advanced Nuclear Reactors V
||3D Microstructural Characterization of UO2+x Using High-energy X-rays
||Reeju Pokharel, Donald W. Brown
|On-Site Speaker (Planned)
UO2 is the most commonly used nuclear fuel material in modern nuclear reactors. Due to the extreme operating conditions such as high temperature and accumulation of fission products, the fuel microstructure undergoes major restructuring, which highly affect its lifetime and performance. Among other factors, grain size seems to be one of the parameters that influences the rate of fission gas transport and release. In this work, near-field high-energy X-ray diffraction microscopy (nf-HEDM) technique is used to non-destructively probe bulk samples with varying O/U ratio before and after heat-treatment. The effect of oxygen content and initial sintering conditions on evolution of spatially resolved microstructural parameters such as grain size distribution, porosity, texture and grain boundary misorientation are presented. In the first application of nf-HEDM to such high Z material, we demonstrate the usefulness of this approach towards developing models and a theoretical understanding of grain growth in extreme conditions.
||Planned: A print-only volume