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Evaluation of missing pellet surface geometry on cladding stress distribution and magnitude

机译:评估缺失的颗粒表面几何形状对包层应力分布和强度的影响

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摘要

Missing pellet surface (MPS) defects are local geometric defects in nuclear fuel pellets that result from pellet mishandling or manufacturing. The presence of MPS defects can cause significant clad stress concentrations that can lead to through-wall cladding failure for certain combinations of fuel burnup, and reactor power level or power change. Consequently, the impact of MPS defects has limited the rate of power increase, or ramp rate, in both pressurized and boiling water reactors (PWRs and BWRs, respectively). Improved three-dimensional (3-D) fuel performance models of MPS defect geometry can provide better understanding of the probability for pellet clad mechanical interaction (PCMI), and correspondingly the available margin against cladding failure by stress corrosion cracking (SCC). The Consortium of Advanced Simulations of Light Water Reactors (CASL) has been developing the Bison-CASL fuel performance code to consider the inherently multi-physics and multi-dimensional mechanisms that control fuel behavior, including cladding stress concentrations resulting from MPS defects. This paper evaluates the cladding hoop stress distributions as a function of MPS defect geometry with discrete pellet radial cracks for a set of typical operating conditions in a PWR fuel rod. The results provide a first step toward a probabilistic approach to assess cladding failure during power maneuvers. This analysis provides insight into how varying pellet defect geometries affect the distribution of the cladding stress, as well as the temperature distributions within the fuel and clad; and are used to develop stress concentration factors for comparing 2-D and 3-D models. Published by Elsevier B.V.
机译:缺少颗粒表面(MPS)缺陷是核燃料颗粒中由于处理不当或制造而引起的局部几何缺陷。 MPS缺陷的存在会导致明显的包层应力集中,对于某些燃耗,反应堆功率水平或功率变化的组合,可能会导致贯穿壁的包层失效。因此,MPS缺陷的影响限制了加压反应堆和沸水反应堆(分别为PWR和BWR)中的功率增加率或斜坡率。改进的MPS缺陷几何尺寸的三维(3-D)燃料性能模型可以更好地理解颗粒包覆机械相互作用(PCMI)的可能性,以及相应的抗应力腐蚀开裂(SCC)防止包覆失效的可用余量。轻水反应堆高级模拟协会(CASL)一直在开发Bison-CASL燃料性能规范,以考虑控制燃料行为的固有多物理场和多维机制,包括MPS缺陷导致的包层应力集中。本文针对PWR燃料棒中一组典型的工作条件,评估了具有离散颗粒径向裂纹的MPS缺陷几何形状对包壳环应力分布的影响。结果为朝着概率方法评估功率操纵过程中的包层故障迈出了第一步。该分析提供了洞察,以了解不断变化的颗粒缺陷几何形状如何影响包层应力的分布以及燃料和包层内的温度分布。并用于开发应力集中因子以比较2-D和3-D模型。由Elsevier B.V.发布

著录项

  • 来源
    《Nuclear Engineering and Design》 |2016年第8期|51-63|共13页
  • 作者单位

    Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA;

    Pacific Northwest Natl Lab, Richland, WA 99354 USA;

    Pacific Northwest Natl Lab, Richland, WA 99354 USA|ANATECH Corp, San Diego, CA 92121 USA;

    Elect Power Res Inst, 3412 Hillview Ave, Palo Alto, CA 94304 USA;

    Univ Tennessee, Dept Nucl Engn, Knoxville, TN 37996 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 00:41:52

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