| 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 |
A Phase-Field Model for Studying Palladium Attack of SiC In TRISO |
| Author(s) |
Chaitanya V. Bhave, Jacob Hirschhorn, Matthew Swisher, Larry Aagesen |
| On-Site Speaker (Planned) |
Chaitanya V. Bhave |
| Abstract Scope |
TRISO particle fuels rely on SiC as the primary barrier for metallic fission product (FP) release. Fission generated Pd degrades the SiC layer resulting in the formation of lamellar layers of Pd<sub>x</sub>Si<sub>1-x</sub> and C perpendicular to the direction of attack. Understanding this attack mechanism and resulting microstructure evolution is important in our ability to predict FP release from TRISO. We present a novel phase-field model for the Pd-SiC reaction to simulate the evolution of the SiC layer microstructure during Pd penetration. It is shown that a high flux of Pd and the large difference in the diffusivity of Pd and C result alternating layers of Pd<sub>2</sub>Si and C through spinodal decomposition. The model is implemented using the Multiphysics Object Oriented Simulation Environment (MOOSE). This work underpins the development of a mechanistic model of Pd penetration for engineering scale performance predictions using BISON. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, Computational Materials Science & Engineering |