|About this Abstract
||7th World Congress on Integrated Computational Materials Engineering (ICME 2023)
||Irradiation Effects in MARMOT: Enhancing UO2 Grain Growth Modeling and Validation
||Md Ali Muntaha, Larry Aagesen, Michael R. Tonks
|On-Site Speaker (Planned)
||Md Ali Muntaha
MARMOT simulations extensively investigate grain boundary migration and grain growth in UO2.
MARMOT, designed to model irradiated fuel and cladding at the mesoscale, currently only
accounts for grain growth kinetics in fresh and unirradiated fuel in its UO2 grain growth model.
This omission might significantly affect the accuracy of the model's predictions. In this research,
we seek to expand MARMOT's simulation capabilities by including the impact of irradiation on
UO2 grain growth. We have added these effects to MARMOT by considering thermal spikes and
coupling them with a heat conduction simulation that features a random heat source. To validate
our model, we will compare its predictions to in-situ TEM experimental results obtained under
ion-irradiation conditions using nanocrystalline UO2 thin films. Once validated, we can use the
refined model to assess the importance of this previously neglected mechanism in grain growth for
LWR fuel pellets.