| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
|
| Presentation Title |
Determination of the Radiation Induced Athermal Diffusivity in Uranium Mononitride from an Integrated Approach |
| Author(s) |
Anton Schneider, Michael Cooper, Jason Rizk, Topher Matthews, Maria Kosmidou, David Andersson |
| On-Site Speaker (Planned) |
Anton Schneider |
| Abstract Scope |
Uranium mononitride is one of the ceramic-fuel alternatives to oxide fuel considered for advanced reactor designs. As such, key properties like self- and fission gas diffusion need to be better understood. While the determination of high-temperature equilibrium diffusivity (D1) is well established, radiation enhanced (D2) and radiation induced athermal (D3) diffusivities remain challenging to accurately predict. We combine molecular dynamics, SRIM calculations and experimental results to determine the D3 diffusivity, which governs diffusion at the low temperatures UN fuels may operate.
Molecular dynamics simulations are used to estimate the mean square displacement (MSD) induced by a primary knock-on atom (PKA) with a given kinetic energy. These results are combined with PKA energy distributions of specific fission fragments obtained from SRIM and with the experimental fission yield of 235U to determine the displacement induced by the average fission event, and to calculate D3 as a function of the fission rate density. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Modeling and Simulation, Nuclear Materials, Computational Materials Science & Engineering |