第39卷第4期电站系统工程Vol.39No.42023年7月PowerSystemEngineering63文章编号:1005-006X(2023)04-0063-04某核电高压加热器传热管缺陷问题分析与处理三门核电有限公司王保田摘要:高压给水加热器是核电站二回路重要设备,就某核电机组首次大修高加传热管涡流检测发现大量缺陷问题,分别用缺陷机理矩阵分析法和故障树分析法对传热管缺陷原因进行了分析,得出传热管缺陷原因为点蚀腐蚀;并对缺陷传热管堵管准则进行了论述,分析了大比例堵管对机组热力性能的影响,总结了开展长周期检查策略等手段持续监督该加热器传热管完整性的建议。关键词:高压加热器;传热管缺陷;点蚀腐蚀;堵管;机组出力中图分类号:TL3文献标识码:BAnalysisandTreatmentofHighPressureFeedwaterHeatersTubeWallThinningofNuclearPowerPlantWANGBao-tian(SanmenNuclearPowerPlantCo.,Ltd.)Abstract:Thehighpressurefeedwaterheatersareimportantequipmentinthesecondloopofnuclearpowerplant.Alargenumberofdefectivetubeswerefoundineddycurrentinspectionofhighpressurefeedwaterheatersheatingtubesduringthefirstoverhaulincertainnuclearpowerplant.Thecausesofthedefectiveheatingtubeswereanalyzedbymeansofdefectmechanismmatrixanalysisandfaulttreeanalysisrespectively.Thepluggingcriterionofdefectiveheatingtubesarealsodiscussed,analyzestheinfluenceofpluggingonT-Gthermalperformance,andsummarizesthecontinuousmonitoringoftheintegrityofheatingtubesbymeansoflongperiodinspectionstrategy,whichcanbeusedforreferenceindealingwiththesametypeofdefectsinnuclearpowerplantsKeywords:highpressurefeedwaterheater;heatingtubesdefective;pittingcorrosion;tubeplugging;T-Goutput某核电站一期工程采用三代核电AP1000技术,建设2台核电机组,每台汽轮发电机组额定功率为1251MW;二回路抽汽加热采用“两高四低一除氧”配置,其中高压给水加热器(下称高加)分为两列:#6A/#7A高加为一列,#6B/#7B高加为另一列,并配有25%容量的高加旁路。高加采用水平布置、双程U形管式结构,由壳体、给水进出口接管、管板、水室隔板、人孔、传热管束、管束支撑板、蒸汽入口接管、疏水进出口接管等组成,见图1。每台高加传热管数量为3152根,传热管为有缝管SA-688TP304L材质,规格Ф15.88×1.47mm(内径Ф12.94),传热管两端与管板采用胀管连接加密封焊。图1某电站高加...