| 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 |
Kernel Composition and Variability Influence on TRISO Fuel Behavior |
| Author(s) |
Tyler J. Gerczak, Grant Helmreich, Will Cureton |
| On-Site Speaker (Planned) |
Tyler J. Gerczak |
| Abstract Scope |
The kernel in tristructural isotropic (TRISO) coated particle fuel concepts influences in-pile particle behaviors including retention of fission products and mitigation of CO(g) partial pressure to limit over pressurization and kernel migration. These phenomena influence the operational envelope for TRISO based reactors (e.g., burnup and power density) and were a motivation for targeting multiphase uranium oxide / uranium carbide (UCO) kernels over single-phase uranium oxide (UO2) kernels for the US DOE Advanced Gas Reactor Fuel Development and Qualification (AGR) Program. Suppression of CO(g) production in UCO kernels limits kernel migration; however, kernel migration has been observed in margin irradiation tests from the final AGR irradiation (AGR-5/6/7). A discussion of the proposed mechanisms of kernel migration in UCO TRISO will be presented along with discussion of the impact of interparticle variability of the UCO kernel composition on the observed kernel migration and other performance metrics such as fission product retention. |
| Proceedings Inclusion? |
Planned: |