Multiphysics simulation and analysis for fuel behavior with geometric irregularities of missing pellet surface and eccentricity

IF 1.9 3区工程技术 Q1 NUCLEAR SCIENCE & TECHNOLOGY

Nuclear Engineering and Design Pub Date : 2025-04-11 DOI:10.1016/j.nucengdes.2025.114039

Xiaoyang Yuan, Rong Liu, Shengyu Liu

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引用次数: 0

Abstract

Missing pellet surface (MPS) defect and fuel eccentricity are both the abnormal geometric phenomena of nuclear fuel rods. One of cladding failure causes is ascribed to the MPS owing to manufacturing, and fuel eccentricity will lead to irregular temperature distribution which could affect the design and safe operation of nuclear reactor. However, most of nuclear fuel performance codes are developed with 1.5D and 2D axisymmetric geometries and not applicable for these asymmetric problems. In this paper, a code using 3D geometric model is established to simulate fuel pellet with irregular geometries of MPS and eccentricity based on COMSOL Multiphysics software. First, the existence of MPS is considered and analyzed. The simulation results of MPS defect in conditions of stable power, power change and reactivity initiated accident (RIA) condition are discussed, and some adverse effects on thermal and mechanical performance can be observed under these conditions. The discussion of depth variation of MPS and different fuel types is also included. Finally, the effects of eccentricity on fuel behavior in different cases are researched. Fuel eccentricity can lead to uneven temperature field and early pellet-cladding mechanical interaction (PCMI) time.

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对颗粒表面缺失和偏心等几何不规则情况下的燃料行为进行多物理场模拟和分析

缺球团表面缺陷和燃料偏心都是核燃料棒的异常几何现象。包层失效的原因之一是由于制造过程中产生的MPS，而燃料偏心会导致包层温度分布不均匀，影响反应堆的设计和安全运行。然而，大多数核燃料性能规范是根据1.5D和2D轴对称几何形状制定的，不适用于这些不对称问题。本文基于COMSOL Multiphysics软件，建立了一种利用三维几何模型对具有不规则MPS几何形状和偏心的燃料颗粒进行模拟的程序。首先，对MPS的存在性进行了思考和分析。讨论了MPS缺陷在稳定功率、功率变化和反应性引发事故（RIA）条件下的模拟结果，并在这些条件下观察到对热性能和力学性能的不利影响。讨论了MPS的深度变化和不同燃料类型。最后，研究了不同工况下偏心距对燃油性能的影响。燃料偏心会导致温度场不均匀和球团包壳机械相互作用（PCMI）时间提前。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.