| 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 |
Fission Gas Behavior Modeling at High Burnup in UO2 |
| Author(s) |
Pierre-Clement A. Simon, Larry Aagesen, David Andersson, Sudipta Biswas, Nathan Capps, Michael Cooper, Stephen Novascone |
| On-Site Speaker (Planned) |
Pierre-Clement A. Simon |
| Abstract Scope |
While extending fuel burnup beyond current licensing practices would optimize fuel utilization, burnup extension remains limited by a lack of understanding and experimental data of high burnup (HBu) fuel performance. Beyond current burnup limits, drastic microstructure changes including subgrain formation and increasing pore density impact UO2 fuel performance and models for low burnup behavior are no longer applicable. Where microstructural changes happen (in the rim region and in the dark zone deeper in the fuel), new mechanisms of fission gas behavior and are enabled, which lead to a currently misunderstood increase in fission gas release (FGR), especially during transient conditions. The Nuclear Energy Advanced Modeling and Simulation (NEAMS) program is utilizing a multiscale approach to capture these new FGR mechanisms in the fuel performance code BISON. New models for HBu fission gas behavior and release are presented and their impacts are quantified. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Nuclear Materials, |