About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Accelerated Qualification of Nuclear Materials Integrating Experiments, Modeling, and Theories
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Presentation Title |
A Diffusion-controlled Creep Model in Monolithic Umo Fuels Under Irradiation |
Author(s) |
Shenyang Hu, Zirui Mao, Benjamin Beeler |
On-Site Speaker (Planned) |
Shenyang Hu |
Abstract Scope |
Monolithic UMo fuel is under development for converting highly enriched 235U fuels currently used in high-power research reactors in the United States to low enriched 235U fuels. Experiments show that geometric stability due to creep is one of the failure modes in the monolithic fuels. In this talk, we will present a creep model by integrating rate theory, random walk for grain boundary diffusion, a phase field model of gas bubble evolution and crystal plasticity. We assume that 1) local anisotropic stresses affect the mobility of defects and 2) stress-enhanced diffusion is the dominant creep mechanism due to small grain size and high volume fraction of gas bubbles. With the model, we simulated the effect of local stress and fission density on creep rates for given temperature, fission rate, gas bubble structures and defect properties. Obtained results was used to develop a creep model for macroscale fuel performance modeling. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Mechanical Properties, Modeling and Simulation |