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Development and application of a multi-scale coupling model for dispersion plate-type fuel
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刘
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Y
Y
C
Y
J
DOI：10.1016/j.pnucene.2026.106403.png)
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Abstract
En 中文
Dispersion plate-type nuclear fuel is a composite structure where ceramic fuel particles are dispersed within a metallic matrix, which is then encapsulated by a metallic cladding. The fuel particles are extremely small and numerous, resulting in a highly intricate fuel meat structure that is difficult to simulate with full fidelity. Taking U3Si2-Al dispersion fuel plates as the simulation object, a novel multi-scale coupled modeling approach is developed in this paper, integrating a macroscopic three-dimensional (3D) fuel plate model with a microscopic one-dimensional (1D) cell model. This model enables simultaneous comprehensive macroscopic analysis and the capture of detailed micro-scale particle behavior throughout the fuel meat. The multi-scale coupling model was verified through comparative analysis with several widely adopted models for simulating dispersion materials. The model was applied to simulate the U3Si2-Al fuel assembly of the JRR-3M research reactor. It enabled the identification of peak temperature and stress locations, with subsequent micro-scale simulations providing a detailed evaluation of the local performance parameters at these critical positions. A systematic analysis of the effects of fuel particle size and volume fraction was conducted using the multi-scale model. The results revealed that an increase in particle size leads to only a marginal rise in fuel temperature, whereas the influence of volume fraction is substantially more pronounced. As the volume fraction increased from 30% to 40%, the stress on the fuel particles rose by 11.6%, while the fuel burnup at a fixed power level exhibited a corresponding decrease.
Keywords:
Dispersion plate-type fuel
Multi-scale modeling
U3Si2-Al fuel
Fuel particle size
Volume fraction
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5.5K
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10.0K
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