| About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ceramic Materials for Nuclear Energy Research and Applications
|
| Presentation Title |
Multiscale Modeling of High Burn-up Structure (HBS) Formation and Evolution in UO2 |
| Author(s) |
Karim Ahmed, Mohammed Abdoelatef, Sudipta Biswas, Larry Aagesen, David Andersson |
| On-Site Speaker (Planned) |
Karim Ahmed |
| Abstract Scope |
A multiphysics, multiscale model was developed to simulate the High burn up structure (HBS) formation in UO2. First, an atomistic model was established to accurately estimate the effective diffusion coefficient of Xe in UO2 talking into account different diffusion mechanisms. Then a mesoscale model was formulated to couple rate-theory and phase-field modeling techniques to simulate the concurrent evolution of defects and microstructure. The resultant model is able to account for the accumulation of point defects into bubbles and dislocation loops and the eventual transformation into the porous fine-grained HBS. The effects of temperature, bubble pressure, density and distribution of dislocation loops, grain and bubble sizes were thoroughly investigated. The consequence of the findings on gas swelling and release rates, fracture, and fragmentation will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, |