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首页> 外文会议>Tribo-Corrosion: Research, Testing, and Applications >Development of a Predictive Wear Model for Grid-to-Rod Fretting in Light Water Nuclear Reactors
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Development of a Predictive Wear Model for Grid-to-Rod Fretting in Light Water Nuclear Reactors

机译：轻水核反应堆栅杆微动磨损预测模型的建立

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The U.S. Dept. of Energy is supporting a multi-party, jive-year program called the Consortium for Advanced Simulation of Light Water Reactors (CASL). Its mission is to develop simulations of light water nuclear reactor (LWR) performance that include the capability for enhanced component life prediction. The phenomenon of fretting between clad fuel rods and the metallic grid that holds them in place is a subject within one of CASL's three focus areas. In order to better define the challenge of grid-to-rod fretting (GTRF) and its consequences, a survey of fretting wear and corrosion literature was conducted. Particular attention was paid to the integration of a realistic operating environment with physical processes occurring in the tribo-logical interface. The implications of a non-linear rate of wear are considered. The development of Zr-based alloys in the 1960s, past studies of the corrosion scale-forming mechanisms on those alloys, and the non-steady-state nature of the contact problem between grids and rods are discussed. Attention is paid to the challenges involved in applying results from classical fretting wear studies to the challenging problem of intermittent fretting contact and impacts in flowing hot water environments within a reactor vessel. While daunting in its complexity, a realistic problem definition is essential for the development of predictive wear-life models to support CASL's virtual reactor environment. This paper concludes with a discussion of the "work rate" parameter, and presents a brief summary of GTRF wear modeling approaches that include wear plus oxidation.
机译：美国能源部正在支持名为“轻水反应堆高级仿真联盟”（CASL）的多方，为期一年的计划。它的任务是开发轻水核反应堆（LWR）性能的仿真，其中包括增强组件寿命预测的功能。复合燃料棒与将金属棒固定在适当位置的金属格栅之间的微动现象是CASL的三个重点领域之一。为了更好地定义栅对杆微动（GTRF）的挑战及其后果，对微动磨损和腐蚀文献进行了调查。尤其要注意将实际操作环境与摩擦逻辑界面中发生的物理过程相集成。考虑了非线性磨损率的影响。讨论了Zr基合金在1960年代的发展，过去对这些合金的腐蚀垢形成机理的研究，以及栅与棒之间接触问题的非稳态性质。应注意将经典微动磨损研究结果应用于间歇性微动接触和反应堆容器内流动热水环境中的冲击这一具有挑战性的问题。尽管其复杂性令人生畏，但现实的问题定义对于开发预测磨损寿命模型以支持CASL虚拟反应堆环境至关重要。本文以“工作率”参数的讨论作为结束，并简要介绍了包括磨损加氧化的GTRF磨损建模方法。

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