for Nuclear Power Plants - ?· for Nuclear Power Plants Gary W Castleberry PE PMP ... • On January…

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  • EnvironmentalQualificationofSafety Related Electrical EquipmentSafetyRelatedElectricalEquipment

    forNuclearPowerPlantsGaryWCastleberryPEPMP

    www.PDHcenter.com PDHonline Course E396 www.PDHonline.org

    Gary W. Castleberry 1 of 63

  • Learning ModulesLearningModules

    1. WhatisEnvironmentalQualification(EQ)

    2 i f Q2. HistoryofEQ

    3. FederalRegulation10CFR50.49

    4. IEEE323

    5 What the Industry Has Learned5. WhattheIndustryHasLearned

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  • Module1h l l fWhatisEnvironmentalQualification?

    Toprotectthehealthandsafetyofthepublicallp y pcommercialnuclearreactorsarehousedinsteelandreinforcedconcretecontainmentbuildings(CB)(CB)

    InsidetheCBisthereactorandsteamgeneratorscontainingwaterathightemperaturesandpressures

    AlsoinsidetheCBareelectricalcomponentscritical to the safe shutdown of the nuclearcriticaltothesafeshutdownofthenuclearreactor

    ThesecomponentsareclassifiedasClass1Ep

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  • What is Environmental Qualification?WhatisEnvironmentalQualification?

    TypicalContainmentBuildingforaNuclearPowerPlant4

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  • What is Environmental Qualification?WhatisEnvironmentalQualification?

    All piping penetrations to the CB mustAllpipingpenetrationstotheCBmusthaveredundantisolationvalves

    Intheunlikelyeventofapipebreakiny p ptheCB,alargeamountofsteamandenergyisreleasedinsidetheCB

    ThisaccidentwouldsubjecttheClass1Ecomponentstoelevatedtemperatures,

    d d blpressures,radiationandpossiblesubmergence

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  • What is Environmental Qualification?WhatisEnvironmentalQualification?

    To ensure the Class 1E components canToensuretheClass1Ecomponentscanfunctionduringandaftertheaccidenttheymustbequalifiedtothisharshenvironment

    Manyindustrystandardshavebeendevelopedtodescribethepreferredmethodsfortestingandqualifyingthesecomponents

    Tounderstandwheretheseprogramsaretoday,onemustunderstandthehistoryofEnvironmentalQualification(EQ)

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  • Module2History of Environmental Qualification in the USAHistoryofEnvironmentalQualificationintheUSA

    NuclearIndustry

    IntheUSnuclearpowerplantsarebuiltandoperatedbypublicutilitycompanies

    TheFederalGovernmentissuedlicensestooperateafterextensivereviewsofvolumesofsafety analysis reportssafetyanalysisreports

    ThisgovernancewasinitiallyperformedbytheAtomicEnergyCommission

    Intheearly1970stheNuclearRegulatoryCommission(NRC)wasformedtooverseecommercial nuclear powercommercialnuclearpower

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    The regulations governing nuclear power areTheregulationsgoverningnuclearpowerarefoundinPart50ofTitle10oftheCodeofFederal RegulationsFederalRegulations

    AppendixAto10CFR50istheGeneralDesignCriteria (GDC) which provide the must doCriteria(GDC)whichprovidethe mustdo designaspectsofanuclearpowerplant

    Th i i i l h i i l f Theirpurposeistoinculcatetheprincipleofdefenseindepth

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    Elements of Defense in DepthElementsofDefenseinDepth RedundantandDiverseSafetySystemsnecessaryforthesafeshutdownofthenuclearreactor

    AutomaticReactorProtectionSystemsthatshutdownthereactorwhencriticalparameterlimitsare exceededareexceeded

    RadiationContainmentBarriers Fuel Rods FuelRods Reactorpipingsystem ContainmentBuilding

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    Criterion 4 of the GDC requires:Criterion4oftheGDCrequires: Structures,systems,andcomponentsimportantto safety shall be designed to accommodate thetosafetyshallbedesignedtoaccommodatetheeffectsofandbecompatiblewiththeenvironmentalconditionswithnormaloperation,maintenance,testingandpostulatedaccidents,includinglossofcoolantaccidents.

    Therewaslittleguidanceearlyoninhowtomeetthisrequirement

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    In 1969 the Union of Concerned Scientists (USC)In1969,theUnionofConcernedScientists(USC)wascreated Formed by an ad hoc group of faculty and students atFormedbyanadhocgroupoffacultyandstudentsattheMassachusettsInstituteofTechnology

    Wantedtoprotestwhattheyperceivedasthemisuseofscienceandtechnology

    Inthemid1970stheUSCpetitionedtheNRCregardingthetestfailuresofsomesafetyrelatedcomponentssomeutilitieshadexperienced

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    As a result of the USC petition, on May 31,AsaresultoftheUSCpetition,onMay31,1978theNRCissuedCircular7808EnvironmentalQualificationofSafetyRelatedElectricalEquipmentatNuclearPowerPlants

    Theintentwastohighlightthelessonslearnedfromthesetestfailures

    TheutilitieswereinstructedtoreviewtheirEQprograms

    Nowrittenresponsewasrequired

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    Following the issuance of Circular 7808 theFollowingtheissuanceofCircular78 08theNRCconductedseveralinspectionsatutilitiesand found little progress was being made onandfoundlittleprogresswasbeingmadeonEQ

    As a result on February 8 1979 the NRC Asaresult,onFebruary8,1979theNRCissuedBulletin7901.

    Thi b ll ti i d th tiliti ithi 120 Thisbulletinrequiredtheutilities,within120days,toprovideawrittensubmittaloftheinformation requested in Circular 7808informationrequestedinCircular78 08.

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    At 4 a m on March 28 1979 the accident atAt4a.m.onMarch28,1979theaccidentatThreeMileIslandoccurredresultinginacoremelt eventmeltevent

    Lessonslearnedwasthatseveralcriticalcomponentsfailedduringtheaccidentduetotheharshaccidentenvironment

    Failure of sensors denied control Failureofsensorsdeniedcontrolroomoperatorscriticalinformationduringtheevent

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    On January 14, 1980 the NRC issued BulletinOnJanuary14,1980theNRCissuedBulletin7901Brequestingaresubmittaloftheinformationpreviouslyrequestedin7901

    RequiredthedevelopmentofaMasterEquipmentListofEQcomponents

    7901BincludedEnclosure4GuidelinesforEvaluationEnvironmentalQualificationofClass1EElectricalEquipmentinOperatingReactors

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    NRCheldfourdaysofindustrymeetingsinJulyC e d ou days o dust y eet gs Ju y1980todiscusstherequirementsof7901BandthefuturecodificationofEQ

    FollowingthismeetingtheNRCissuedSupplement2and3to7901Btoanswerthe

    ti i d b th i d t i th J lquestionsraisedbytheindustryintheJulymeeting

    EPRI formed a Utility Advisory Group on EQ to EPRIformedaUtilityAdvisoryGrouponEQtoaddressresearchrequiredtoqualifysomecomponentsp

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    Following the accident at TMI the NRC issuedFollowingtheaccidentatTMItheNRCissuedmanynewregulationsbaseduponlessonslearnedlearned

    InDecember1980RegulatoryGuide1.97Instrumentation for Light Water CooledInstrumentationforLightWaterCooledNuclearPowerPlantstoAssessPlantandEnvirons Conditions During and Following anEnvironsConditionsDuringandFollowinganAccidentwasissuedbytheNRC

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  • HistoryofEnvironmentalQualificationh l dintheUSANuclearIndustry

    RegulatoryGuide1.97addressedspecificegu ato y Gu de .9 add essed spec cinstrumentationusedinthecontrolroomwhichneededtobeupgraded

    Upgradesincludedhigherqualitypowersources,diversityoftheinstrumentsignal,andthe

    i t l lifi ti f thenvironmentalqualificationofthesensorelement

    When the rule for EQ was issued in 10CFR50 49 WhentheruleforEQwasissuedin10CFR50.49,paragraph(b)(3)includedtheequipmentfromRegulatoryGuide1.97g y

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  • Module3d l lFederalRegulations10CFR50.49

    TheruleforEQisfoundinthecodeoffederale u e o Q s ou d t e code o ede aregulations10CFR50.49

    Requireseachlicenseetoestablishaprogramforq p gEQ

    Paragraph(b)definesthethreegroupsofequipmentimportanttosafety SafetyrelatedelectricalequipmentN f t l t d i t h f il ld Nonsafetyrelatedequipmentwhosefailurecouldimpactasafetyrelatedcomponent

    CertainpostaccidentmonitoringequipmentCertain post accident monitoring equipment

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  • Important to SafetyImportanttoSafety

    Important to safety is an important conceptImportanttosafetyisanimportantconcept

    Itencompassesmorethanjustsafetyrelated

    h i h i i d hThatiswhyitisrepeatedhere Safetyrelatedelectricalequipment Nonsafetyrelatedequipmentwhosefailurecouldimpactasafetyrelatedcomponent

    Certainpostaccidentmonitoringequipment

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  • Environmental Qualification ProgramEnvironmentalQualificationProgram

    10 CFR50 49 defines safety related equipment10CFR50.49definessafetyrelatedequipmentasequipmentwhichmustsurvivedesignbasisevents to ensure:eventstoensure: Theintegrityofthereactorcoolantpressureboundaryboundary

    Theabilitytoshutdownthereactorandkeepitinsafeshutdownmodesa e s u do ode

    Themitigationofoffsiteradiationexposures

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  • Environmental Qualification ProgramEnvironmentalQualificationProgram

    Design Basis EventsDesignBasisEvents NormaloperationAnticipated operational occurrences Anticipatedoperationaloccurrences

    DesignbasisaccidentsE t l t Externalevents

    Naturalphenomenal f l h h Examples:Lossofcoolantaccident,high

    energylinebreak,flooding

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  • Environmental Qualification ProgramEnvironmentalQualificationProgram

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  • Environmental Qualification ProgramEnvironmentalQualificationProgram

    The requirements for qualification areTherequirementsforqualificationareaddressedinpart(e)oftheruleandinclude: (1)Temperatureandpressure.Timedependent( ) p p ppressureandtemperatureforthelocationoftheequipmentimportanttosafety(2) H idi H idi ff d i h d i (2)Humidity.Humidityeffectsduringthedesignbasisaccidentsmustbetakenintoconsideration

    (3) Chemical effects The composition of (3)Chemicaleffects.Thecompositionofchemicalsexposuremustbethemostseverepostulated

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  • Environmental Qualification ProgramEnvironmentalQualificationProgram

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    TypicalLOCATemperatureandPressureCurvesforQualification

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  • Environmental Qualification ProgramEnvironmentalQualificationProgram

    Requirementscontinuedq (4)Radiation.Theradiationdoseforcomponentsmustbebaseduponthetotaldosereceivedduringthe years of normal operation over the life of thetheyearsofnormaloperationoverthelifeofthecomponentplustheradiationreceivedduringandaftertheaccident.

    (5) Aging Equipment that is qualified by testing must (5)Aging.Equipmentthatisqualifiedbytestingmustbeconditionedpriortothetesttosimulatetheyearsinservicepriortoanaccident.Thismaybedonebyusing actually aged components or by artificially agingusingactuallyagedcomponentsorbyartificiallyagingthecomponent.Ifartificialpreconditioningisnotpracticalforthefullintendedservicelife,shorterservice lives can be established.servicelivescanbeestablished.

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  • Environmental Qualification ProgramEnvironmentalQualificationProgram

    Requirementscontinued (6)Submergence (ifsubjecttobeingsubmerged).Equipmentmustbequalifiedtothesubmergencedepthanticipatedormovedabovethefloodplain.

    (7)Synergisticeffects.Synergisticeffectsoccurwhenthecombinedeffectofmorethanoneinputcreatesamoresevereresponsethanthesomeoftheindividualinputsl If i i ff b li d halone.Ifsynergisticeffectsarebelievedtohaveasignificanteffectonequipmentqualification,theymustbeconsidered.(8)M i T t f t i t i t t l i (8)Margins.Toaccountforuncertaintyintestoranalysis,marginsmustbeappliedintheanalysisortest.Thisalsoprovidesassurancethatvariationsinmanufacturingprocesses do not negate the qualificationprocessesdonotnegatethequalification.

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  • EQProgramDocumentationfRequirementsfrom10CFR50.49

    Part(d)of10CFR50.49states:Theapplicantorlicenseeshallpreparealistofelectricequipmentimportanttosafetycoveredbythissection.Inaddition,theapplicantorlicenseeshallincludetheinformationinparagraphs(d)(1),(2),and(3)ofthissectionforthiselectricequipmentimportanttosafetyinaqualificationfile.

    The applicant or licensee shall keep the list and information in the file current andTheapplicantorlicenseeshallkeepthelistandinformationinthefilecurrentandretainthefileinauditableformfortheentireperiodduringwhichthecovereditemisinstalledinthenuclearpowerplantorisstoredforfutureusetopermitverificationthateachitemofelectricequipmentisimportanttosafelymeettherequirementsofparagraph(j)ofthissection.

    (1)Theperformancespecificationsunderconditionsexistingduringandfollowingdesignbasisaccidents.

    (2)Thevoltage,frequency,load,andotherelectricalcharacteristicsforwhichtheperformancespecifiedinaccordancewithparagraph(d)(1)ofthissectioncanbeensured.

    (3)Theenvironmentalconditions,includingtemperature,pressure,humidity,radiation,chemicals,andsubmergenceatthelocationwheretheequipmentmustperformasspecifiedinaccordancewithparagraphs(d)(1)and(2)ofthissection.

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  • Module 4 IEEE 323Module4IEEE323

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  • IEEE 323IEEE323

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