|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Ceramic Materials for Nuclear Energy Research and Applications
||On the Role of Neutron Irradiation Damages on Fission Products Transport in the SiC Layer of TRISO Fuel Particles
||Subhashish Meher, Isabella van Rooyen, Chao Jiang
|On-Site Speaker (Planned)
It has been recently discovered that the precipitation of intragranular palladium-containing fission products in the SiC layer of neutron-irradiated tristructural isotropic (TRISO) fuel particles possibly occurs via a novel dual-step nucleation mechanism. Direct observations of Pd silicide imprinting into morphological templates of α-SiC precipitates in neutron-irradiated SiC layer of TRISO fuel will be discussed, with examples from selected particles from both the Advanced Gas Reactor (AGR)-1 and AGR-2 fuel irradiation experiments. The physical understanding of intragranular fission product precipitation has been studied by both advanced microscopy and first principle calculations. Along with this, the large-scale precipitates of fission products at IPyC layer, and grain boundaries of SiC have been found to be constituted of separate regions of fission products.