| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ceramics and Ceramic-based Composites for Nuclear Fission Applications
|
| Presentation Title |
Impact of Grain Boundary and Surface Diffusion on Predicted Fission Gas Bubble Microstructural Evolution Behavior and Release in UO2 Nuclear Fuel |
| Author(s) |
Md Ali Muntaha, Sourav Chatterjee, Michael Tonks, Larry Aagesen, David Andersson, Brian Wirth, Sophie Blondel |
| On-Site Speaker (Planned) |
Md Ali Muntaha |
| Abstract Scope |
In this work, we quantify the impact of grain boundary (GB) and surface diffusion on fission gas bubble morphological evolution and release in UO2 nuclear fuel using 2D and 3D simulations with a hybrid phase field/cluster dynamics model. We represent fast GB and surface diffusion using a heterogeneous diffusivity that is a function of the order parameters representing bubbles and grains. A free surface boundary condition is applied to predict the gas release. We find that the GB diffusivity directly impacts the rate of gas release via GB transport and that the GB diffusivity is likely below 103 times the lower value from Olander and van Uffelen (2001). We also find that surface diffusivity impacts bubble coalescence and mobility, and we can observe the coalescence behavior more prominently using 3D simulation. We conclude that the bubble surface diffusivity is likely below 10-4 times the value from Zhou and Olander (1984). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Modeling and Simulation, Nuclear Materials |