某核电厂高压加热器疏水管道多参数疲劳监测与评估  

Multi-parameter Fatigue Monitoring and Assessment of a High Pressure Heater Drain Pipe in Nuclear Power Plant

作　　者：林磊[1] 徐德城[1] 浦燕明 刘寅立 LIN Lei;XU De-cheng;PU Yan-ming;LIU Yin-li(Suzhou Nuclear Power Research Institute Co.,Ltd.,Suzhou,Jiangsu Prov.215004,China)

机构地区：[1]苏州热工研究院有限公司,江苏苏州215004

出　　处：《中国核电》2022年第2期240-246,共7页China Nuclear Power

基　　金：江苏省基础研究计划(自然科学基金,蒸汽发生器传热管束热-流-固耦合特性及失效机理研究,BK20170383)。

摘　　要：为分析核电厂高压加热器疏水管道频繁疲劳开裂的根本原因,采用应变、振动和温度多参数连续监测的方法,对管道表面应变、振动加速度和表面温度的周期波动特征进行了分析。计算了疏水管道关键位置的应力范围,并基于3D雨流统计法计算交变应力幅。应力范围、交变应力、振动加速度和温度等多参数的综合分析表明,疏水阀间歇启闭引起的下游焊缝处交变应力过大,是造成疲劳开裂的根部原因,疏水管道设计布置不佳导致应力范围过大、焊缝内壁形态不良等促进了管道焊缝的内壁启裂及扩展。提出了改进管线设计、疏水阀选型、改变焊接形式等消除疏水管道疲劳开裂的建议。The multi-parameter continuous monitoring method is applied to analyze the root cause of a high pressure heater drain pipe in nuclear power plant.The parameters include strain,acceleration and temperature.The periodical fluctuation properties of these parameters were studied.The stress range was calculated and 3-D rain-flow method was adopted to calculate the alternating stresses.The multi-parameter analysis indicates that the stress fluctuation by drain valve s periodical action has resulted in high level alternating stress,and the oversize stress range and poor surface feature had accelerated the crack initiation.Measures as improving the pipe design,changing the drain valve operation mode and improving the weld configuration are proposed to eliminate this fatigue crack problem.

关 键 词：疏水管道 疲劳开裂 多参数 疲劳监测 

分 类 号：TB122[理学—工程力学]