| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advanced Characterization of Materials for Nuclear, Radiation, and Extreme Environments III
|
| Presentation Title |
Correlating Irradiation Defect Models to Thermal Conductivity Evolution under Irradiation in ThO2 |
| Author(s) |
Joshua Ferrigno, Saqeeb Adnan, Amey Khanolkar, Miaomiao Jin, Kaustubh Bawane, Linu Malakkal, Erika Nosal, Zilong Hua, Lingfeng He, David Hurley, Marat Khafizov |
| On-Site Speaker (Planned) |
Joshua Ferrigno |
| Abstract Scope |
Correlating microstructure evolution to physical properties of nuclear fuel materials under irradiation is of paramount importance to development of predictive fuel performance codes capturing steady, transient, and off-normal operating conditions. We demonstrate this based on a comprehensive effort targeting both experiments and modeling. We implement a coupled approach that includes a Rate Theory model used to estimate the crystallographic defect populations and a Klemens-Callaway model to estimate the irradiated lattice conductivity in fluorite oxides. This combined model is used to analyze a range of experimental characterization in proton irradiated thorium dioxide. Our analysis suggests that thermal conductivity in ThO2 irradiated at room temperature is governed by point defects, whereas in samples irradiated at 600 °C, thermal conductivity degradation is due to point defects and dislocation loops. These observations emphasize the importance of considering resonance effects in phonon scattering with irradiation induced defects. |