|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Computational Materials Science and Engineering for Nuclear Energy
||Atomistic Study of Thermal Spike Response of Xe Bubbles in UO<sub>2</sub>
||Wahyu Setyawan, Michael W.D. Cooper, Kenneth J Roche, Brian D Wirth, Blas P Uberuaga, David A Andersson, Richard J Kurtz
|On-Site Speaker (Planned)
Understanding fission gas release in nuclear fuels requires knowledge of the gas bubble distribution. Accurate modeling of bubble distribution is challenging due to dynamically complex interactions with neutrons and energetic fission fragments. In this presentation, we explore one of the fundamental processes that influences the distribution of Xe bubbles in a UO<sub>2</sub> crystal, namely the re-solution of Xe atoms from the bubbles back to the UO<sub>2</sub> matrix. Molecular dynamics was employed with a recently developed interatomic potential to simulate the response of Xe bubbles to an ionizing fission fragment modelled as a thermal spike. We study the response as a function of bubble size, bubble pressure, electronic stopping power, and off-center distance of the thermal spike to the bubble center. Empirical models of the re-solution will be presented. The effect of off-center thermal spikes on the shape of the bubbles will be discussed.
||Planned: Supplemental Proceedings volume