晶粒尺寸和孔隙率对高燃耗UO2包层失效的影响：灵敏度和不确定度研究

IF 2.1 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-09-24 DOI:10.1016/j.nucengdes.2025.114484

Ian Greenquist, Ashley Shields

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引用次数: 0

摘要

正在研究同位素标记剂，以协助核材料的来源评估。然而，这些标记剂的选择必须使它们在正常操作或事故情况下不会对燃料性能产生不利影响。已知标记物会影响燃料的晶粒尺寸和孔隙度。在本文中描述的工作中，BISON燃料性能代码用于评估在高燃耗、大断裂冷却剂损失事故中，标记物（即颗粒尺寸和孔隙度）对燃料棒行为和包层失效的潜在影响。在这里，来自同一堆芯的281个燃料棒被建模用于敏感性研究、参数研究和不确定性量化。包层失效预测往往表现为随机行为。进一步研究发现，包层失效模型对数值近似解固有的残余误差非常敏感。讨论了降低这种敏感性的一些策略。研究发现在已知的标记效应和包层失效状态之间没有关系。然而，在某些杆中发现标记物会影响失效的时间和位置。简要讨论了继续调查和验证这些发现的未来工作。

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Effects of grain size and porosity on cladding failure in high-burnup UO2: A sensitivity and uncertainty study

Isotopic taggants are being studied to aid in the provenance assessment of nuclear materials. However, these taggants must be selected such that they do not adversely affect fuel performance during normal operation or accident scenarios. Taggants are known to affect the fuel’s grain size and porosity. In the work described in this paper, the BISON fuel performance code was used to assess the potential effects of taggants (i.e., grain size and porosity) on fuel rod behavior and cladding failure during a high-burnup, large-break loss-of-coolant accident. Here, 281 individual fuel rods from the same reactor core were modeled for a sensitivity study, a parametric study, and uncertainty quantification.

The cladding failure predictions often exhibited stochastic behavior. After additional study, it was found that the cladding failure model is highly sensitive to residual error inherent to numerical approximation solvers. Some strategies to mitigate this sensitivity are discussed.

The study found no relationship between known taggant effects and cladding failure status. However, taggants were found to affect the time and location of failure in certain rods. Future work to continue investigating and validating these findings is briefly discussed.

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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.