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首页> 外文会议>ASME Pressure Vessels and Piping conference >LOAD DATA EVALUATION, STRESS ANALYSIS AND CYCLE COUNTING FOR THE QUALIFIED THERMAL FATIGUE ASSESSMENT OF A NPP COMPONENT
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LOAD DATA EVALUATION, STRESS ANALYSIS AND CYCLE COUNTING FOR THE QUALIFIED THERMAL FATIGUE ASSESSMENT OF A NPP COMPONENT

机译：NPP组件热疲劳评估的载荷数据评估，应力分析和循环计数

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Qualified fatigue assessment based on realistic input data constitutes an essential part of an ageing management strategy for Nuclear Power Plants. In this context and as a continuation of a previous paper PVP2014-28716 the requirements of load data evaluation, stress analysis and cycle counting are detailed based on a real world example from a Brazilian Nuclear Power Plant. One essential prerequisite of any fatigue assessment approach is the availability of realistic load data. In the present analysis, selected operational plant data from the period 2003 to 2012 are used. One further prerequisite is the accurate component stress analysis based on a transient thermal-mechanical Finite Element Analyses. As an example, a highly loaded nozzle from the Chemical & Volume Control System (CVCS) is chosen to be analyzed. The influences on the fatigue assessment caused by the load-time histories, the stress analysis approaches and the cycle counting method are discussed in detail. The considered operational time period from 2003 to 2012 with respective selected plant data gives a consolidated background. It is one essential aim of the study to show the influence of the load-data input and the (design code conforming) stress analysis method on the resulting calculated cumulative usage factors (CUFs). In the present paper, the stress analysis employs the finite element method. Simplified elastic-plastic (application of k_e plasticity factors) procedures are used in order to identify the margins and influences of design and actual loading histories on the resulting CUFs. The paper concludes with a comprehensive picture including quantification and discussion of the different influencing parameters on the resulting CUFs. This reveals margins in the fatigue design process and solutions of coping with the design code requirements.
机译：基于实际输入数据的合格疲劳评估是核电厂老化管理策略的重要组成部分。在此背景下，作为先前论文PVP2014-28716的继续，根据巴西核电厂的实际示例详细说明了负载数据评估，应力分析和周期计数的要求。任何疲劳评估方法的基本前提之一是实际载荷数据的可用性。在本分析中，使用了2003年至2012年期间选定的工厂运行数据。另一个先决条件是基于瞬态热机械有限元分析的准确的组件应力分析。例如，选择要分析的化学和体积控制系统（CVCS）的高负载喷嘴。详细讨论了载荷时间历史，应力分析方法和循环计数方法对疲劳评估的影响。考虑的2003年至2012年的运营时间段以及各自选定的工厂数据给出了合并的背景。研究的基本目的之一是显示载荷数据输入和（符合设计规范的）应力分析方法对所得的计算出的累积使用系数（CUF）的影响。在本文中，应力分析采用有限元方法。使用简化的弹塑性（应用k_e塑性因子）程序来确定设计和实际加载历史对最终CUF的余量和影响。本文以全面的图片作为结尾，包括量化和讨论了对最终CUF的不同影响参数。这揭示了疲劳设计过程中的余地以及满足设计规范要求的解决方案。

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