About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
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Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
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Presentation Title |
An Integrated Statistical-thermodynamic Model for Fission Gas Swelling and Release in Nuclear Fuels |
Author(s) |
Charles Lieou, Nathan A Capps, Michael W. D. Cooper, Pierre-Clement A. Simon, Brian D. Wirth |
On-Site Speaker (Planned) |
Michael W. D. Cooper |
Abstract Scope |
We propose a new model for burst fission gas release induced by microcracking in ceramic nuclear fuels such as uranium dioxide. The model stipulates that the densities of defects in the fuel material, such as microcracks and fission gas bubbles on grain boundaries, evolve in accordance with the second law of thermodynamics. Central to the model is the notion of an effective temperature, conjugate to the configurational entropy of the fuel material, and directly linked to the burnup. The model predicts that microcracking, driven by the internal stress state of the fuel material, reduces the bubble storage capacity of grain boundaries, and accounts for burst fission gas release during rapid temperature transients that simulate loss-of-coolant accident conditions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Ceramics, Modeling and Simulation |