| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Late News Poster Session
|
| Presentation Title |
N-44: Oxidation and Microstructural Characterization of Tristructural Isotropic Particles (TRISO) in High Temperature Mixed Gas Atmospheres |
| Author(s) |
Katherine Montoya, Brian Brigham, Tyler Gerczak, Elizabeth Sooby |
| On-Site Speaker (Planned) |
Katherine Montoya |
| Abstract Scope |
TRISO particles are composed of 4 layers surrounding a fuel kernel suspended in graphite matrix material to form a fuel compact for high temperature gas cooled reactors. Off-normal reactor conditions can introduce steam to the fuel causing matrix oxidation with volatile gas production (CO and H2). The degraded matrix would expose the SiC layer in the TRISO to mixed gas atmosphere. Damage to this layer can cause particle failure and fission product release. To investigate potential failure modes of SiC in a complex atmosphere, oxidation testing of surrogate SiC exposed TRISO particles was conducted with a mixture of steam (<0.2 atm H2O), CO, and H2 (<0.02 atm) at high temperatures (1300ºC <T<1500ºC) in thermogravimetric analyzer. This study provides a mapping of microstructures associated with SiC oxidation regimes under matrix oxidation. Advanced characterization techniques include x-ray diffraction, focused ion beam and scanning electron microscopy to characterize the oxidized SiO2-SiC interface. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Characterization, Nuclear Materials, High-Temperature Materials |