About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
2026 Graduate Student Poster Contest
|
| Presentation Title |
SPG-26: Characterizing Thermal Pd Transport in Coated Advanced Nuclear Fuel (TRISO) Particles at High Temperatures |
| Author(s) |
Sabiha Younus, Jerod Siguaw, TyRon Jones, Steven Jay Cavazos, Mira Khair, Patrick Warren, Ana Stevanovic, Elizabeth Sooby |
| On-Site Speaker (Planned) |
Sabiha Younus |
| Abstract Scope |
The Tristructural Isotropic (TRISO) particle is a composite nuclear fuel architecture with multiple layers providing structural integrity and preventing fission product release. Palladium is a fission product whose accumulation in the pyrolytic carbon and SiC layers can lead to reduced performance and eventual failure of the particle. Investigation is ongoing to fully capture the mechanism of Pd transport. In this study, Pd-SiC diffusion couples were annealed at 900°C, 1000°C, and 1100°C for 1, 4, 8, 16, and 32 hours at each temperature. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, Raman spectroscopy and nanoindentation were used to characterize Pd interaction within the post-anneal microstructure and on bulk Pd2Si. Microhardness, alongside grain geometry, of bulk SiC and the SiC layer in surrogate TRISO particles (sourced from Oak Ridge National Laboratory) were compared. Results provide insight into the impact of SiC mechanical properties on Pd migration within TRISO particles. |