Strain test and stress intensity assessment of a CPR1000 Nuclear Power Plant pressurizer during pre-delivery hydrostatic test

Case Studies in Structural Engineering Pub Date : 2014-12-01 DOI:10.1016/j.csse.2014.09.002

Lin Lei, Xu Decheng, Yu Min, Xue Fei, Jiang Jiawang, Zhang Guodong, Zhao Wensheng

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引用次数: 2

Abstract

Strain gages are applied to get the strain and stress of a CPR1000 Nuclear Power Plant (NPP) pressurizer during the pre-delivery hydrostatic test. The measured strain curves are discussed to find the deformation features of the cylinder. The stresses of cylindrical base metal, longitudinal welds and girth welds are calculated and compared with the theoretical values. The stresses in girth welds and upper head nozzle welds show non-uniformity at these areas. The possible reasons are discussed for this phenomenon. The stress intensity is calculated and evaluated according to the allowable limit. The fatigue usage factor is evaluated by considering the effect of internal pressure rise-and-fall cycle to pressurizer’s total fatigue life. The evaluated results show that the hydrostatic test has little effect on the integrity or fatigue life of the pressurizer. This test provides the basic deformation data of the pressurizer, which plays an important role in the ageing assessment and management during operation.

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CPR1000核电站稳压器交付前水压试验应变试验及应力强度评估

采用应变计测量了CPR1000核电站稳压器在交付前水压试验中的应变和应力。对测量的应变曲线进行了讨论，找出了圆柱体的变形特征。计算了圆柱形母材、纵焊缝和围焊缝的应力，并与理论值进行了比较。围焊缝和上封头喷嘴焊缝的应力在这些区域表现出不均匀性。对这种现象的可能原因进行了讨论。根据允许极限对应力强度进行计算和评定。通过考虑内压升降循环对稳压器总疲劳寿命的影响，对其疲劳利用率进行了评价。评价结果表明，水压试验对稳压器的完整性和疲劳寿命影响不大。该试验提供了稳压器的基本变形数据，对运行中的老化评估和管理具有重要作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Case Studies in Structural Engineering

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