Phase-field simulation of fission bubbles formation in composite ceramic nuclear fuel

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Engineering and Design Pub Date : 2024-07-28 DOI:10.1016/j.nucengdes.2024.113485

引用次数: 0

Abstract

A phase-field model was developed to simulate the evolution of fission bubbles in UN-UO₂ composite ceramic nuclear fuel. The model was firstly used to simulate the formation of UO₂ intracrystalline bubbles, and the change of porosity obtained from the simulation was compared with the experimental data. The bubble evolution of UN-UO₂ composite fuels in the UN and UO₂ phase regions was then investigated for different burnups and doping concentrations. It was found that the nucleation rate of bubbles in the UN phase was slower than that in the UO₂ phase, but the growth rate of bubbles in the UN phase was faster, so that the bubbles in the UO₂ phase had a larger number density at low fuel consumption. It is specifically analyzed how the surface energy, diffusion coefficient and uranium density affect the difference in bubble evolution between the two phases.

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复合陶瓷核燃料中裂变气泡形成的相场模拟

建立了一个相场模型来模拟 UN-UO 复合陶瓷核燃料中裂变气泡的演变过程。首先利用该模型模拟了 UO 晶内气泡的形成，并将模拟得到的气孔率变化与实验数据进行了比较。然后，研究了不同燃耗和掺杂浓度下 UN-UO 复合燃料在 UN 和 UO 相区的气泡演化过程。结果发现，UN 相中气泡的成核速度比 UO 相中的慢，但 UN 相中气泡的增长速度较快，因此在低燃料消耗时，UO 相中的气泡数量密度较大。具体分析了表面能、扩散系数和铀密度对两相气泡演化差异的影响。

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来源期刊

Nuclear Engineering and Design 工程技术-核科学技术

CiteScore

3.40

自引率

11.80%

发文量

377

审稿时长

5 months

期刊介绍： Nuclear Engineering and Design covers the wide range of disciplines involved in the engineering, design, safety and construction of nuclear fission reactors. The Editors welcome papers both on applied and innovative aspects and developments in nuclear science and technology. Fundamentals of Reactor Design include: • Thermal-Hydraulics and Core Physics • Safety Analysis, Risk Assessment (PSA) • Structural and Mechanical Engineering • Materials Science • Fuel Behavior and Design • Structural Plant Design • Engineering of Reactor Components • Experiments Aspects beyond fundamentals of Reactor Design covered: • Accident Mitigation Measures • Reactor Control Systems • Licensing Issues • Safeguard Engineering • Economy of Plants • Reprocessing / Waste Disposal • Applications of Nuclear Energy • Maintenance • Decommissioning Papers on new reactor ideas and developments (Generation IV reactors) such as inherently safe modular HTRs, High Performance LWRs/HWRs and LMFBs/GFR will be considered; Actinide Burners, Accelerator Driven Systems, Energy Amplifiers and other special designs of power and research reactors and their applications are also encouraged.