Recent test data indicate that the effects of the light water reactor (LWR) environment could significantly reduce the fatigue resistance of materials used in the reactor coolant pressure boundary components of operating nuclear power plants. Argonne National Laboratory has developed interim fatigue curves based on test data simulating LWR conditions, and published them in NUREG/CR-5999. In order to assess the significance of these interim fatigue curves, fatigue evaluations of a sample of the components in the reactor coolant pressure boundary of LWRs were performed. The sample consists of components from facilities designed by each of the four U.S. nuclear steam supply system vendors. For each facility, six locations were studied, including two locations on the reactor pressure vessel. In addition, there are older vintage plants where components of the reactor coolant pressure boundary were designed to codes that did not require an explicit fatigue analysis of the components. In order to assess the fatigue resistance of the older vintage plants, an evaluation was also conducted on selected components of three of these plants. This paper discusses the insights gained from the application of the interim fatigue curves to components of seven operating nuclear power plants.
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机译：最近的测试数据表明，光水反应器（LWR）环境的效果可以显着降低操作核电站反应器冷却剂压力边界部件中使用的材料的疲劳电阻。 Argonne National Laboratory在模拟LWR条件的测试数据中开发了临时疲劳曲线，并在NUREG / CR-5999中发布了它们。为了评估这些临时疲劳曲线的重要性，进行LWR的反应器冷却剂压力边界中的组分样品的疲劳评价。该样品包括由四个美国四个U.核蒸汽供应系统供应商中的每一个设计的设施的组件组成。对于每个设施，研究了六个位置，包括反应器压力容器上的两个位置。此外，还有较旧的老式植物，其中反应器冷却剂压力边界的组件被设计为不需要对部件的明确疲劳分析的代码。为了评估较旧的老式植物的疲劳性，还对其中三种植物的选定组分进行了评价。本文讨论了从临时疲劳曲线应用到七种经营核电站组件中获得的见解。
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