|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Ceramic Materials for Nuclear Energy Research and Applications
||Atomistic-scale simulations used to simulate creep in oxide fuel
||Conor Galvin, Aritra Chakraborty, Laurent Capolungo, David Andersson, Michael Cooper
|On-Site Speaker (Planned)
Doped UO2, which has been doped to produce a larger grain size than conventional UO2, has been proposed as an advanced fuel candidate. The larger grain sizes provide improved operational fuel behavior for fission gas retention and pellet-cladding interactions due to improved mechanical properties. One such property is creep.
Using molecular dynamics, we predict information at the atomistic scale that can be used to develop a mechanistic UO2 creep model for use in longer time/length-scale codes. The ultimate objective of the model is to better describe the grain size dependence and impact of doping. Previously, we found that Nabarro-Herring creep was too low to capture the experimentally observed creep rates. Therefore, other mechanisms which have distinct grain size dependences have been explored. In this work, we investigate the concentration, segregation and diffusivity of various defects at grain boundaries in UO2 to explore their impact on Coble creep.