|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Advanced Characterization and Modeling of Nuclear Fuels: Microstructure, Thermo-physical Properties
||Mesoscale Hybrid Model for Fission Gas Behavior in UO2: Coupling the Phase Field Method to Spatially Resolved Cluster Dynamics
||Sophie Blondel, David A. Andersson, David E. Bernholdt, Dong-Uk Kim, Fande Kong, Md Ali Muntaha, Philip C. Roth, Michael R. Tonks, Brian D. Wirth
|On-Site Speaker (Planned)
Fission gas release within UO2 occurs as gas atoms diffuse through grains and arrive at grain boundary (GB) bubbles, GB bubbles grow and interconnect with grain edge bubbles, and finally grain edge tunnels grow and connect to free surfaces. We present a multi-physics simulation approach to investigate these mechanisms at the mesoscale. The fission gas production and intragranuar physics are included using spatially resolved cluster dynamics in the Xolotl code. Intergranular gas bubble growth and interconnection are included using the phase field method in the MARMOT fuel performance code. The two codes are loosely coupled through the MOOSE MultiApp system: MARMOT passes the GBs locations to Xolotl, and Xolotl passes fission gas rate at GBs surfaces to MARMOT. We have demonstrated this hybrid model behaves correctly using 2D simulations, and a model for fission gas outgazing is being added. Initial 3D results will also be presented.
||Modeling and Simulation, Nuclear Materials,