TechnicalColumn46SAFETY&EMCNo.120230引言近几年来,随着科学技术的快速发展,能源需求的增长愈加迫切[1-2]。为实现节能、环保和减排,我国将核能发电作为国家能源战略发展的重要组成部分之一[3]。但发展核电走可持续发展道路的同时,也要解决随之而来的核安全问题[4-5]。摘要:核电设备的安全性要求极高,为解决核电厂核辐射监测(KRT)系统实际工况下的误报警问题,在实验室环境下搭建了KRT系统抗瞬态脉冲干扰试验最小系统,提出了带有集总电容C的模拟测试方案,并从不同端口开展了电磁干扰注入试验。试验结果表明:模拟测试方案的抗扰度测试结果低于GB/T17626.4-2018测试方案,较低的干扰等级就能触发KRT系统误报警;KRT系统的敏感设备为本地信号处理显示单元(LPDU)及其探头回路,LPDU敏感端口为探头线端口及主机接地端口,两端口的电磁瞬态最低抗扰等级分别为220V、270V。安装及运维工程师现场操作时,要充分保护敏感回路,防止引入干扰;设备厂商应结合实际工况开展电磁抗扰试验,以使试验结果对于核电厂关键设备的安全运行及维护更有指导意义。关键词:核辐射监测系统;瞬态脉冲干扰;电磁干扰;闪发报警;本地信号处理显示单元引用格式:邵伟恒,孙尧,管嘉焕,等.核电厂核辐射监测系统误报警问题分析及对策[J].安全与电磁兼容,2023(1):46-49,65.ShaoWeiheng,SunYao,GuanJiahuan,etal.AnalysisandCountermeasureofFalseAlarmProblemofRadiationMonitoringSysteminNuclearPowerPlant[J].SAFETY&EMC,2023(1):46-49,65.(inChinese)Abstract:Thesafetyrequirementsofnuclearpowerequipmentareextremelyhigh.Inordertosolvefalsealarmproblemofnuclearradiationmonitoring(KRT)systeminnuclearpowerplantunderactualworkingconditions,theminimumKRTsystemfortransientpulseinterferencetestisbuiltinthelaboratoryenvironment,asimulationtestschemewithlumpedcapacitanceCisproposed,andelectromagneticinterferenceinjectiontestsarecarriedoutfromdifferentports.ThetestresultsshowthattheimmunitytestresultofthesimulationtestschemeislowerthanthatoftheGB/T17626.4-2018testscheme,andlowerinterferencelevelcantriggertheKRTsystemfalsealarm.ThesensitiveequipmentofKRTsystemisthelocalsignalprocessingdisplayunit(LPDU)anditsprobeloop.TheLPDUsensitiveportistheprobelineportandthehostgroundingport.Theminimumimmunityleve...