Prediction and Deformation Mechanism Analysis of High Porosity in U–10Mo Monolithic Fuels at High Burnup
Abstract
:1. Introduction
2. Improved Fuel Skeleton Creep-Based Volume Growth Model for U–Mo Fuels
3. Finite Element Modeling of the In-Pile Thermo-Mechanical Coupling Behaviors in the Fuel Plate L1P7A0
3.1. Finite Element Model
3.2. Modeling Approach
4. Results and Discussion
4.1. Predictions of the Macroscale Porosity and the Thickness Deformation for the Fuel Foil
4.2. The Underlying Deformation Mechanism of Higher Porosity of the Fuel Foil at High Burnup
5. Conclusions
- (1)
- The simulation results produce the best-fit creep rate coefficient of 250 × 10−22 mm3/(fission·Mpa) for the Mo-depleted region, and the parameters of fb = 0.4 and fs = −0.4 for the improved bubble growth model, by comparing the predicted results of macroscale porosities and thickness deformation of the U–Mo fuel foil with the experimental results.
- (2)
- The intrusion of solid fission products, leading to the extra differences between the bubble pressure and the external pressure, is the dominant factor to induce the high porosity in most regions of heavily irradiated fuel foil.
- (3)
- The locally enhanced fuel skeleton creep ability is responsible for the higher porosities near the U–Mo/Zr interface.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
Appendix A
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Parameter | Point B | Point C |
---|---|---|
Bubble volume (10−20 m3) | 3.99047 | 0.14677 |
Local porosity (%) | 4.10474 | 0.150874 |
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Jian, X.; Zhao, Y.; Ding, S. Prediction and Deformation Mechanism Analysis of High Porosity in U–10Mo Monolithic Fuels at High Burnup. Metals 2023, 13, 1693. https://doi.org/10.3390/met13101693
Jian X, Zhao Y, Ding S. Prediction and Deformation Mechanism Analysis of High Porosity in U–10Mo Monolithic Fuels at High Burnup. Metals. 2023; 13(10):1693. https://doi.org/10.3390/met13101693
Chicago/Turabian StyleJian, Xiaobin, Yunmei Zhao, and Shurong Ding. 2023. "Prediction and Deformation Mechanism Analysis of High Porosity in U–10Mo Monolithic Fuels at High Burnup" Metals 13, no. 10: 1693. https://doi.org/10.3390/met13101693