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首页> 外文会议>ASME pressure vessels and piping conference;PVP2009 >STUDY OF THE EFFECTS OF ENVIRONMENT IN THE FATIGUE ANALYSIS ON EXISTING LWR AS PROPOSED IN USNRC RG 1.207
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STUDY OF THE EFFECTS OF ENVIRONMENT IN THE FATIGUE ANALYSIS ON EXISTING LWR AS PROPOSED IN USNRC RG 1.207

机译：USNRC RG 1.207中提议的现有轻水堆疲劳分析中的环境影响研究

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US NRC Regulatory Guide 1.207 Rev. 0 provides guidance for use in determining the acceptable fatigue life of ASME pressure boundary components, with consideration of the light-water reactor (LWR) environment. Because of significant conservatism in quantifying other plant-related variables (such as cyclic behavior, including stress and loading rates) involved in cumulative fatigue life calculations, the design of the current fleet of reactors is satisfactory. For new plants under design and current operating plants considering applying for License Renewal, the environment effects may need to be considered in the design.RG 1.207 proposes using an environmental correction factor (F_(en)) to account for LWR environments by correcting the fatigue usage calculated with the ASME "air" curves. The F_(en) method is presented in NUREG/CR-6909, "Effect of LWR Coolant Environments on the Fatigue Life of Reactor Materials". By definition, F_(en) is the ratio of fatigue life of the component material at room temperature air environments to its fatigue life in LWR coolant at operating temperature. To incorporate environmental effects into the fatigue evaluation, the fatigue usage is calculated using provisions set forth in Section Ⅲ of the ASME Code, and is adjusted by multiplying a correction factor.The calculated F_(en) values are then used to incorporate environmental effects into ASME fatigue usage factor evaluation. Once the environmental correction factors have been determined, the previously calculated allowable number of cycles for each load set pair based on the current Code fatigue design curve can be adjusted to determine the new fatigue usage factors for environmental effects. This paper presents a study of the effect of the Regulatory Guide if it is to be implemented on the current fleet of LWR. A quick assessment of the sensitivity of the various environmental parameters is also included in this paper. The comparison of environmental effects between the simplified approach in this paper and the results with detailed computer analyses, such as Unisont's propriety computer code UPIPENB (Ref. 4), will be our next research project to be presented in the future conference.
机译：美国NRC监管指南1.207修订版0提供了用于在考虑轻水反应堆（LWR）环境的情况下确定ASME压力边界组件的可接受疲劳寿命的指南。由于在量化累加寿命计算中涉及的其他与工厂有关的变量（例如循环行为，包括应力和负荷率）方面具有显着的保守性，因此当前反应堆的设计是令人满意的。对于正在设计中的新工厂和正在考虑申请许可证更新的当前运营中的工厂，在设计中可能需要考虑环境影响。 RG 1.207建议使用环境校正因子（F_（en））通过校正由ASME“空气”曲线计算出的疲劳使用量来解决LWR环境。 F_（en）方法在NUREG / CR-6909“轻水堆冷却剂环境对反应堆材料疲劳寿命的影响”中介绍。根据定义，F_（en）是在室温空气环境下组件材料的疲劳寿命与其在工作温度下的LWR冷却剂中的疲劳寿命之比。到 将环境影响纳入疲劳评估，使用ASME规范第Ⅲ节中的规定计算疲劳使用量，并乘以校正因子进行调整。 然后，将计算出的F_（en）值用于将环境影响纳入ASME疲劳使用系数评估中。一旦确定了环境校正因子，就可以根据当前的Code疲劳设计曲线调整先前计算的每个载荷对对的允许循环次数，以确定对环境影响的新疲劳使用因子。如果要在当前的轻水堆船队中实施《指南》，本文将对《指南》的效果进行研究。本文还包括对各种环境参数敏感性的快速评估。本文的简化方法与详细的计算机分析结果（如Unisont的专有计算机代码UPIPENB（参考文献4））之间的环境影响比较将是我们在下届会议上提出的下一个研究项目。

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