About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
|
Presentation Title |
Radiation-driven Diffusion of U, Si, and Xe in Amorphous U3Si2 |
Author(s) |
Gyuchul Park, Zhi-Gang Mei, Benjamin Beeler, Bei Ye |
On-Site Speaker (Planned) |
Gyuchul Park |
Abstract Scope |
U3Si2-Al dispersion fuel is being considered as a candidate for converting high-power research and test reactors (RTRs) from using highly enriched uranium (HEU) fuel to low enriched uranium (LEU) fuel, given its stable swelling behavior in the historical experiments. Previous studies showed that U3Si2, a tetragonal crystal structure at equilibrium, transitions into an amorphous phase completely at low irradiation dose and maintains the amorphous state under RTR operating conditions (<250 °C). To better understand the irradiation behavior of the amorphous U3Si2, radiation-driven diffusion coefficients of U, Si, and Xe in amorphous U3Si2 are calculated in this study via molecular dynamics simulations and compared to intrinsic diffusion to understand the dominating diffusion mechanism under RTR operating conditions. The calculated diffusion coefficients in amorphous U3Si2 will be implemented into mechanistic models to predict swelling behavior. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Nuclear Materials, |