| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Microstructural, Mechanical, and Chemical Behavior of Solid Nuclear Fuel and Fuel-Cladding Interface II
|
| Presentation Title |
Phase-Field Modeling of Fission Fragment Track Effects on Nucleation and Re-Solution of Fission Gas Bubbles in UO2 |
| Author(s) |
Albert C. Lin, Yongfeng Zhang |
| On-Site Speaker (Planned) |
Albert C. Lin |
| Abstract Scope |
Extensive research on fission gas release in nuclear fuels has been conducted to increase safety and high burnup performance. However, gaps remain in our knowledge of fission gas behavior due to the complexity of mechanisms involved. In intragranular gas bubble populations, two phenomena—spatial alignment and narrow size distributions—are observed experimentally but not captured in existing models. These shortcomings in existing models may result from inadequate treatment of heterogeneous bubble nucleation and re-solution mechanisms. A phase-field model has been developed to simulate the effects of fission fragment tracks on gas bubble evolution to study these heterogeneous mechanisms and their impact on fission gas behavior. The model demonstrates promoted nucleation and re-solution of existing bubbles in the damage wake of fission fragment tracks, potentially explaining phenomena missing in other models. Modeling results are used to assess the validity of simplifying assumptions made in the modeling treatment of nucleation and re-solution. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, Computational Materials Science & Engineering |