|About this Abstract
||MS&T23: Materials Science & Technology
||Ceramics for New Generation Nuclear Energy System Application
||Atomistic Understanding of Thermal Conductivity Degradation in Irradiated Oxide Fuels
||Marat Khafizov, Saqeeb Adnan, Erika Nosal, Miaomioa Jin, Linu Malakkal, Amey Khanolkar, Shuxiang Zhou, Zilong Hua, Kaustubh Bawane, Boopathy Kombaiah, Chao Jiang, Lingfeng He, Michael Manley, David Hurley
|On-Site Speaker (Planned)
Understanding thermal transport in fuels is important for development of safe, efficient, and autonomous nuclear reactors. Investigation of impact of atomic level defects on thermal conductivity of thorium dioxide whose transport properties are governed by phonons is presented. In a defect free system, three-phonon interactions can be accurately calculated from first principles interatomic interactions within Boltzmann transport formalism. A perturbative approach can be used to determine the impact of defects on phonon scattering using interatomic interactions derived from first principles. One can also implement molecular dynamics simulations based on empirical interatomic potentials. To validate accuracy of the above models, we have established a comprehensive framework which uses tailored ion beam irradiation, microstructure characterization, and thermal transport measurements. To complement electron and optical microscopy characterization, a rate theory model is implemented to infer defect population impacting thermal conductivity. These results provide a pathway for development of predictive fuel performance codes.