|About this Abstract
||MS&T21: Materials Science & Technology
||Probing Defect Properties and Behavior under Mechanical Deformation and Extreme Conditions
||Impact of Grain Boundary and Surface Diffusion on Fission Gas Release in UO2 Nuclear Fuel Using a Phase Field Model
||Md Ali Muntaha, Dong-Uk Kim, Michael Tonks
|On-Site Speaker (Planned)
||Md Ali Muntaha
This study aims to quantify the importance of grain boundary and surface diffusion on the fission gas release mechanism in UO2 nuclear fuel. Most computational studies of fission gas bubble behavior found in the available literature do not consider faster diffusion along grain boundaries, triple junctions, and gas bubble surfaces. Our study has investigated the importance of grain boundary and surface diffusion on fission gas release in UO2 nuclear fuel. To do that, we have added a free surface on a specific boundary on the domain to observe the gas release amount through the free surface. We have incorporated diffusion heterogeneity for providing a faster diffusion path along the grain boundary and interface. We have developed and applied a phase-field model using an open-source finite element tool MOOSE for mesoscale modeling. Our model predicts that incorporating diffusion heterogeneity changes the way microstructure evolves and changes the fission gas release rate.