About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
2D Simulations of Localized Palladium Silicide Inclusions in TRISO Fuel With BISON |
| Author(s) |
Bailey T. Bertrand, Wen Jiang, Brian D Wirth |
| On-Site Speaker (Planned) |
Bailey T. Bertrand |
| Abstract Scope |
Many advanced reactor concepts plan to use TRistructural ISOtropic (TRISO) fuel particles. TRISO fuel has undergone extensive testing within the US as part of the Advanced Gas Reactor (AGR) campaign at Idaho National Laboratory. Following elevated temperature irradiation, a possible failure mechanism involves chemical attack of the silicon carbide layer by fission products, most notable of these being palladium. Current models are based on limited data and a simple empirical scaling and lack the physical basis to accurately model and predict the impact of such attack on stress development and failure probability. As such, there is a significant need and opportunity to improve the failure criteria of the SiC layer based on the effects of Pd corrosion. This presentation will describe our use of the BISON fuel performance code to investigate mechanical effects of Pd chemical attack on SiC failure probabilities. Localized Pd inclusions, with representative size and geometry have been introduced into the 2D TRISO mesh at the IPyC – SiC interface. The inclusion size is static throughout the simulation duration to focus on the mechanical interactions between the inclusion and SiC. The generated stresses are used to calculate a SiC failure probability via Weibull Statistics, and our work has systematically varied the inclusion size and volume fraction to evaluate the impact on failure probability. Baseline SiC failure probabilities are on order of 10-5. Localized inclusions increase the SiC failure probability to on order of 10-3. |
| Proceedings Inclusion? |
Undecided |