IEC/IEEE62582-1:2024-09(en-fr)

IEC/IEEE62582-1

?

Edition2.0 2024-09

INTERNATIONALSTANDARD

Nuclearpowerplants–Instrumentationandcontrolimportanttosafety–Electricalequipmentconditionmonitoringmethods–

Part1:General

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IEC/IEEE62582-1

?

Edition2.0 2024-09

INTERNATIONALSTANDARD

Nuclearpowerplants–Instrumentationandcontrolimportanttosafety–Electricalequipmentconditionmonitoringmethods–

Part1:General

INTERNATIONALELECTROTECHNICALCOMMISSION

ICS27.120.20 IECISBN978-2-8322-9581-6

IEEEISBN979-8-8557-1270-4STD27336

Warning!Makesurethatyouobtainedthispublicationfromanauthorizeddistributor.

?RegisteredtrademarkoftheInternationalElectrotechnicalCommission

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PAGE

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– IEC/IEEE62582-1:2024?IEC/IEEE2024

IEC/IEEE62582-1:2024?IEC/IEEE2024 –

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11

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CONTENTS

FOREWORD 3

INTRODUCTION 5

Scope 8

Normativereferences 8

Termsanddefinitions 9

Conditionindicators 11

General 11

Chemicalindicators 12

Physicalindicators 12

Electricalindicators 12

Otherindicators 12

Visualandtactileobservation 12

Applicabilityofconditionindicatorstodifferenttypesofpolymericmaterials 12

Destructiveandnon-destructiveconditionmonitoring 13

Applicationofconditionmonitoringinequipmentqualificationandmanagementof

ageing 13

General 13

Useofconditionmonitoringintheestablishmentofqualifiedlife 13

Establishmentofqualifiedlife 13

Determinationoftheaccelerationfactorinacceleratedthermalageing 14

Useofconditionmonitoringintheextensionofqualifiedlife 15

Useofconditionmonitoringintheestablishmentandassessmentof

qualifiedcondition 15

Useofbaselinedata 17

AnnexA(informative)Diffusionlimitedoxidation(DLO) 18

General 18

ImportanceofDLOinthermalageing 18

MethodsforprofilingDLOeffects 19

TheoreticalapproachtoDLO 19

Bibliography 21

Figure1–ExampleofanArrheniusdiagram 14

Figure2–Influenceofactivationenergyonqualifiedlife,determinedfromaccelerated

thermalageingfor42daysat110°C,followedbyasimulateddesignbasisevent 15

Figure3–Illustrationoftheprincipleofcondition-basedqualification 16

FigureA.1–IndentermodulusprofilesforEPDMsealagedat170°C(left)and

110°C(right)[1] 19

INTERNATIONALELECTROTECHNICALCOMMISSION

NUCLEARPOWERPLANTS–

INSTRUMENTATIONANDCONTROLIMPORTANTTOSAFETY–ELECTRICALEQUIPMENTCONDITIONMONITORINGMETHODS–

Part1:General

FOREWORD

TheInternationalElectrotechnicalCommission(IEC)isaworldwideorganizationforstandardizationcomprisingallnationalelectrotechnicalcommittees(IECNationalCommittees).TheobjectofIECistopromoteinternationalco-operationonallquestionsconcerningstandardizationintheelectricalandelectronicfields.Tothisendandinadditiontootheractivities,IECpublishesInternationalStandards,TechnicalSpecifications,TechnicalReports,PubliclyAvailableSpecifications(PAS)andGuides(hereafterreferredtoas"IECdocument(s)").Theirpreparationisentrustedtotechnicalcommittees;anyIECNationalCommitteeinterestedinthesubjectdealtwithmayparticipateinthispreparatorywork.International,governmentalandnon-governmentalorganizationsliaisingwiththeIECalsoparticipateinthispreparation.

IEEEStandardsdocumentsaredevelopedwithinIEEESocietiesandStandardsCoordinatingCommitteesoftheIEEEStandardsAssociation(IEEESA)StandardsBoard.IEEEdevelopsitsstandardsthroughaconsensusdevelopmentprocess,approvedbytheAmericanNationalStandardsInstitute,whichbringstogethervolunteersrepresentingvariedviewpointsandintereststoachievethefinalproduct.VolunteersarenotnecessarilymembersofIEEEandservewithoutcompensation.WhileIEEEadministerstheprocessandestablishesrulestopromotefairnessintheconsensusdevelopmentprocess,IEEEdoesnotindependentlyevaluate,test,orverifytheaccuracyofanyoftheinformationcontainedinitsstandards.UseofIEEEStandardsdocumentsiswhollyvoluntary.IEEEdocumentsaremadeavailableforusesubjecttoimportantnoticesandlegaldisclaimers(see

/ipr/disclaimers.html

formoreinformation).

IECcollaboratescloselywithIEEEinaccordancewithconditionsdeterminedbyagreementbetweenthetwoorganizations.ThisDualLogoInternationalStandardwasjointlydevelopedbytheIECandIEEEunderthetermsofthatagreement.

TheformaldecisionsofIEContechnicalmattersexpress,asnearlyaspossible,aninternationalconsensusofopinionontherelevantsubjectssinceeachtechnicalcommitteehasrepresentationfromallinterestedIECNationalCommittees.TheformaldecisionsofIEEEontechnicalmatters,onceconsensuswithinIEEESocietiesandStandardsCoordinatingCommitteeshasbeenreached,isdeterminedbyabalancedballotofmateriallyinterestedpartieswhoindicateinterestinreviewingtheproposedstandard.FinalapprovaloftheIEEEstandardsdocumentisgivenbytheIEEEStandardsAssociation(IEEESA)StandardsBoard.

IEC/IEEEPublicationshavetheformofrecommendationsforinternationaluseandareacceptedbyIECNationalCommittees/IEEESocietiesinthatsense.WhileallreasonableeffortsaremadetoensurethatthetechnicalcontentofIEC/IEEEPublicationsisaccurate,IECorIEEEcannotbeheldresponsibleforthewayinwhichtheyareusedorforanymisinterpretationbyanyenduser.

Inordertopromoteinternationaluniformity,IECNationalCommitteesundertaketoapplyIECPublications(includingIEC/IEEEPublications)transparentlytothemaximumextentpossibleintheirnationalandregionalpublications.AnydivergencebetweenanyIEC/IEEEPublicationandthecorrespondingnationalorregionalpublicationshallbeclearlyindicatedinthelatter.

IECandIEEEdonotprovideanyattestationofconformity.Independentcertificationbodiesprovideconformityassessmentservicesand,insomeareas,accesstoIECmarksofconformity.IECandIEEEarenotresponsibleforanyservicescarriedoutbyindependentcertificationbodies.

Allusersshouldensurethattheyhavethelatesteditionofthispublication.

NoliabilityshallattachtoIECorIEEEortheirdirectors,employees,servantsoragentsincludingindividualexpertsandmembersoftechnicalcommitteesandIECNationalCommittees,orvolunteersofIEEESocietiesandtheStandardsCoordinatingCommitteesoftheIEEEStandardsAssociation(IEEESA)StandardsBoard,foranypersonalinjury,propertydamageorotherdamageofanynaturewhatsoever,whetherdirectorindirect,orforcosts(includinglegalfees)andexpensesarisingoutofthepublication,useof,orrelianceupon,thisIEC/IEEEPublicationoranyotherIECorIEEEPublications.

Attentionisdrawntothenormativereferencescitedinthispublication.Useofthereferencedpublicationsisindispensableforthecorrectapplicationofthispublication.

AttentionisdrawntothepossibilitythatimplementationofthisIEC/IEEEPublicationmayrequireuseofmaterialcoveredbypatentrights.Bypublicationofthisstandard,nopositionistakenwithrespecttotheexistenceorvalidityofanypatentrightsinconnectiontherewith.IECorIEEEshallnotbeheldresponsibleforidentifyingEssentialPatentClaimsforwhichalicensemayberequired,forconductinginquiriesintothelegalvalidityorscopeofPatentClaimsordeterminingwhetheranylicensingtermsorconditionsprovidedinconnectionwithsubmissionofaLetterofAssurance,ifany,orinanylicensingagreementsarereasonableornon-discriminatory.Usersofthisstandardareexpresslyadvisedthatdeterminationofthevalidityofanypatentrights,andtheriskofinfringementofsuchrights,isentirelytheirownresponsibility.

IEC/IEEE62582-1waspreparedbysubcommittee45A:Instrumentationandcontrolofnuclearfacilities,ofIECtechnicalcommittee45:Nuclearinstrumentation,incooperationwithNuclearPowerEngineeringCommitteeoftheIEEEPower&EnergySociety

1

,undertheIEC/IEEEDualLogoAgreementbetweenIECandIEEE.ItisanInternationalStandard.

ThisdocumentispublishedasanIEC/IEEEDualLogostandard.

Thissecondeditioncancelsandreplacesthefirsteditionpublishedin2011.Thiseditionconstitutesatechnicalrevision.

Thiseditionincludesthefollowingsignificanttechnicalchangeswithrespecttothepreviousedition:

IntegrationofexperiencefromtheworkwithIAEA-TECDOC-1825:2017“Benchmarkanalysisforconditionmonitoringtesttechniquesoflowvoltagecablesinnuclearpowerplants.FinalresultsofaCoordinatedResearchProject”.

ReferraltoIEC/IEEE60780-323insteadofIEC60780andIEEE323.

ThetextofthisInternationalStandardisbasedonthefollowingIECdocuments:

Draft

Reportonvoting

45A/1510/CDV

45A/1537/RVC

Fullinformationonthevotingforitsapprovalcanbefoundinthereportonvotingindicatedintheabovetable.

ThelanguageusedforthedevelopmentofthisInternationalStandardisEnglish.

ThisdocumentwasdraftedinaccordancewiththerulesgivenintheISO/IECDirectives,Part2,availableat

www.iec.ch/members_experts/refdocs.

ThemaindocumenttypesdevelopedbyIECaredescribedingreaterdetailat

www.iec.ch/publications/.

AlistofallpartsofIEC/IEEE62582series,underthegeneraltitleNuclearpowerplants–Instrumentationandcontrolimportanttosafety–Electricalequipmentconditionmonitoringmethods,canbefoundontheIECwebsite.

TheIECTechnicalCommitteeandIEEETechnicalCommitteehavedecidedthatthecontentsofthisdocumentwillremainunchangeduntilthestabilitydateindicatedontheIECwebsiteunder

webstore.iec.ch

inthedatarelatedtothespecificdocument.Atthisdate,thedocumentwillbe

reconfirmed,

withdrawn,or

revised.

AlistofIEEEparticipantscanbefoundatthefollowingURL:

/downloads/62582-1/62582-

1-2011/62582-1-2011_wg-participants.pdf.

INTRODUCTION

Technicalbackground,mainissuesandorganisationofthisdocument

ThispartofthisIEC/IEEE62582seriesfocusesonmethodsforconditionmonitoringformanagementofageingofelectricalequipmentinstalledinnuclearpowerplantsandforapplicationoftheconceptofqualifiedcondition.

IEC/IEEE6258-1isthefirstpartoftheIEC/IEEE62582seriesofstandards,containingbackgroundandguidelinesfortheapplicationofmethodsforconditionmonitoringofelectricalequipmentimportanttosafetyofnuclearpowerplants.Thedetaileddescriptionsofthemethodsaregivenintheotherparts,onepartforeachmethod.Thisdocumentalsoincludessomeelementswhicharecommontoallmethods.

IEC/IEEE62582seriesisissuedwithajointlogowhichmakesitapplicabletothemanagementofageingofelectricalequipmentqualifiedtoIEEEaswellasIECStandards.

ConditionmonitoringisadevelopingfieldandmoremethodswillbeaddedtotheIEC/IEEE62582serieswhentheyareconsideredwidelyappliedandagoodreproducibilityoftheconditionmonitoringmethodcanbedemonstrated.

IEC/IEEE60780-323definedcondition-basedqualificationwhichisanadjuncttotypetesting.Thequalifiedconditionisestablishedbyconditionindicator(s)priortothestartofaccidentconditionsforwhichtheequipmentwasdemonstratedtomeetthedesignrequirementsforthespecifiedserviceconditions.IEC/IEEE60780-323definedconditionindicator.

SignificantresearchhasbeenperformedonconditionmonitoringtechniquesandtheuseofthesetechniquesinequipmentqualificationasnotedinNUREG/CR-6704,Vol.2(BNL-NUREG-52610)

[1],

2

JNES-SS-0903,2009

[2]

andIAEA-TECDOC-1825:2017

[3].

ItisintendedthatthisIEC/IEEEdocumentbeusedbyoperatorsofnuclearpowerplants,systemsevaluatorsandbylicensors.

SituationofthecurrentstandardinthestructureoftheIECSC45Astandardseries

IEC/IEEE62582-1isthethirdlevelIECSC45AdocumenttacklingtheissueofapplicationofconditionmonitoringinequipmentqualificationandmanagementofageingofelectricalI&Cequipmentinnuclearpowerplants.

IEC/IEEE62582-1istobereadinassociationwithIEC/IEEE60780-323,whichprovidesgeneralrequirementsforqualificationofI&CsystemsandequipmentthatareusedtoperformfunctionsimportanttosafetyinNPPsandnuclearfacilities.

FormoredetailsonthestructureoftheIECSC45Astandardseries,seeitemd)ofthisintroduction.

Recommendationsandlimitationsregardingtheapplicationofthisdocument

Itisimportanttonotethatthisdocumentestablishesnoadditionalfunctionalrequirementsforsafetysystems.

Thisdocumentdiscussesthegeneralmeasurementtechniqueforcurrentconditionmonitoringmethodsandisnotmeanttocoveranyspecifictechnologies.

NumbersinsquarebracketsrefertotheBibliography.

DescriptionofthestructureoftheIECSC45AstandardseriesandrelationshipswithotherIECdocumentsandotherbodiesdocuments(IAEA,ISO)

TheIECSC45Astandardseriescomprisesahierarchyoffourlevels.Thetop-leveldocumentsoftheIECSC45AstandardseriesareIEC61513andIEC63046.

IEC61513providesgeneralrequirementsforinstrumentationandcontrol(I&C)systemsandequipmentthatareusedtoperformfunctionsimportanttosafetyinnuclearpowerplants(NPPs).IEC63046providesgeneralrequirementsforelectricalpowersystemsofNPPs;itcoverspowersupplysystemsincludingthesupplysystemsoftheI&Csystems.

IEC61513andIEC63046aretobeconsideredinconjunctionandatthesamelevel.IEC61513andIEC63046structuretheIECSC45Astandardseriesandshapeacompleteframeworkestablishinggeneralrequirementsforinstrumentation,controlandelectricalpowersystemsfornuclearpowerplants.

IEC61513andIEC63046referdirectlytootherIECSC45Astandardsforgeneralrequirementsforspecifictopics,suchascategorizationoffunctionsandclassificationofsystems,qualification,separation,defenceagainstcommoncausefailure,controlroomdesign,electromagneticcompatibility,humanfactorsengineering,cybersecurity,softwareandhardwareaspectsforprogrammabledigitalsystems,coordinationofsafetyandsecurityrequirementsandmanagementofageing.ThestandardsreferenceddirectlyatthissecondlevelshouldbeconsideredtogetherwithIEC61513andIEC63046asaconsistentdocumentset.

Atathirdlevel,IECSC45AstandardsnotdirectlyreferencedbyIEC61513orbyIEC63046arestandardsrelatedtospecificrequirementsforspecificequipment,technicalmethods,oractivities.Usuallythesedocuments,whichmakereferencetosecond-leveldocumentsforgeneralrequirements,canbeusedontheirown.

AfourthlevelextendingtheIECSC45standardseries,correspondstotheTechnicalReportswhicharenotnormative.

TheIECSC45AstandardsseriesconsistentlyimplementsanddetailsthesafetyandsecurityprinciplesandbasicaspectsprovidedintherelevantIAEAsafetystandardsandintherelevantdocumentsoftheIAEAnuclearsecurityseries(NSS).InparticularthisincludestheIAEArequirementsSSR-2/1,establishingsafetyrequirementsrelatedtothedesignofnuclearpowerplants(NPPs),theIAEAsafetyguideSSG-30dealingwiththesafetyclassificationofstructures,systemsandcomponentsinNPPs,theIAEAsafetyguideSSG-39dealingwiththedesignofinstrumentationandcontrolsystemsforNPPs,theIAEAsafetyguideSSG-34dealingwiththedesignofelectricalpowersystemsforNPPs,theIAEAsafetyguideSSG-51dealingwithhumanfactorsengineeringinthedesignofNPPsandtheimplementingguideNSS42-Gforcomputersecurityatnuclearfacilities.ThesafetyandsecurityterminologyanddefinitionsusedbytheSC45AstandardsareconsistentwiththoseusedbytheIAEA.

IEC61513andIEC63046haveadoptedapresentationformatsimilartothebasicsafetypublicationIEC61508withanoveralllife-cycleframeworkandasystemlife-cycleframework.Regardingnuclearsafety,IEC61513andIEC63046providetheinterpretationofthegeneralrequirementsofIEC61508-1,IEC61508-2andIEC61508-4,forthenuclearapplicationsector.Inthisframework,IEC60880,IEC62138andIEC62566correspondtoIEC61508-3forthenuclearapplicationsector.

IEC61513andIEC63046refertoISO9001aswellastoIAEAGSRpart2andIAEAGS-G-3.1andIAEAGS-G-3.5fortopicsrelatedtoqualityassurance(QA).

Atlevel2,regardingnuclearsecurity,IEC62645istheentrydocumentfortheIEC/SC45Asecuritystandards.Itbuildsuponthevalidhighlevelprinciplesandmainconceptsofthegenericsecuritystandards,inparticularISO/IEC27001andISO/IEC27002;itadaptsthemandcompletesthemtofitthenuclearcontextandcoordinateswiththeIEC62443series.Atlevel2,IEC60964istheentrydocumentfortheIECSC45Acontrolroomsstandards,IEC63351istheentrydocumentforthehumanfactorsengineeringstandardsandIEC62342istheentrydocumentfortheageingmanagementstandards.

NOTE1ItisassumedthatforthedesignofI&CsystemsinNPPsthatimplementconventionalsafetyfunctions(e.g.toaddressworkersafety,assetprotection,chemicalhazards,processenergyhazards)internationalornationalstandardswouldbeapplied.

NOTE2IECTR63400providesamorecomprehensivedescriptionoftheoverallstructureoftheIECSC45Astandardsseriesandofitsrelationshipwithotherstandardsbodiesandstandards.

NUCLEARPOWERPLANTS–

INSTRUMENTATIONANDCONTROLIMPORTANTTOSAFETY–ELECTRICALEQUIPMENTCONDITIONMONITORINGMETHODS–

Part1:General

Scope

ThispartoftheIEC/IEEE62582seriescontainsrequirementsforapplicationoftheotherpartsofIEC/IEEE62582relatedtospecificmethodsforconditionmonitoringinelectricalequipmentimportanttosafetyofnuclearpowerplants.Italsoincludesrequirementswhicharecommontoallmethods.TheproceduresdefinedinIEC/IEEE62582areintendedfordetailedconditionmonitoring.

IEC/IEEE62582specifiesconditionmonitoringmethodsinsufficientdetailtoenhancetheaccuracyandrepeatability,andprovidestandardformatsforreportingtheresults.Themethodsspecifiedareapplicabletoelectricalequipmentcontainingpolymericmaterials.Somemethodsareespeciallydesignedforthemeasurementofconditionofalimitedrangeofequipmentwhilstotherscanbeappliedtoalltypesofequipmentforwhichthepolymericpartsareaccessible.

AlthoughthescopeofIEC/IEEE62582islimitedtotheapplicationofinstrumentationandcontrolsystemsimportanttosafety,theconditionmonitoringmethodscanalsobeapplicabletoothercomponentswhichincludepolymericmaterials.

ThedifferentpartsofIEC/IEEE62582aremeasurementstandards,primarilyforuseinthemanagementofageingininitialqualificationandafterinstallation.Forthetechnicalbackgroundofconditionmonitoringmethods,referenceismadetootherIECstandards,e.g.IEC60544-5

[1].

InformationontheroleofconditionmonitoringinqualificationofelectricalequipmentimportanttosafetyisfoundinIEC/IEEE60780-323.GeneralinformationonmanagementofageingcanbefoundinIEC62342

[5]

andIEEE1205

[6].

NOTEAsimplifiedversionoftheprocedurescanbeappropriateforpreliminaryassessmentoftheneedfordetailedmeasurements.

Normativereferences

Thefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.

IEC/IEEE60780-323,Nuclearfacilities–Electricalequipmentimportanttosafety–Qualification

IEC/IEEE62582(allparts),Nuclearpowerplants–Instrumentationandcontrolimportanttosafety–Electricalequipmentconditionmonitoringmethods

Termsanddefinitions

Forthepurposesofthisdocument,thefollowingtermsanddefinitionsapply.

ISOandIECmaintainterminologydatabasesforuseinstandardizationatthefollowingaddresses:

IECElectropedia:availableat

/

ISOOnlinebrowsingplatform:availableat

/obp

IEEEStandardsDictionaryOnline:availableat

3.1

conditionindicator

characteristicofastructure,systemorcomponentthatcanbeobserved,measuredortrendedtoinferordirectlyindicatethecurrentandfutureabilityofthestructure,systemorcomponenttofunctionwithinacceptancecriteria

[SOURCE:IAEANuclearSafetyandSecurityGlossary,2022(Interim)Edition]

3.2

conditionmonitoring

continuousorperiodictests,inspections,measurementortrendingoftheperformanceorphysicalcharacteristicsofstructures,systemsandcomponentstoindicatecurrentorfutureperformanceandthepotentialforfailure

[SOURCE:IAEASafetyGlossary,2018Edition,modified–noteremoved.]

3.3

equipmentqualification

generationandmaintenanceofevidencetoensurethatequipmentwilloperateondemand,underspecifiedserviceconditions,tomeetsystemperformancerequirements

[SOURCE:IAEANuclearSafetyandSecurityGlossary,2022(Interim)Edition,modified–notesnotincluded.]

3.4

equipmentimportanttosafety

equipmentthatispartofasafetygroupand/orwhosemalfunctionorfailurecouldleadtoundueradiationexposureofthesitepersonnelormembersofthepublic.Equipmentincluding:

thosestructures,systemsandcomponentsthatpreventanticipatedoperationaloccurrencesfromleadingtoaccidentconditions;

thosefeaturesthatareprovidedtomitigatetheconsequencesofmalfunctionorfailureofstructures,systemsandcomponents.

Note1toentry:

ForusageconsistentwithIEC61226[11],equipmentimportanttosafetyareasfollows:

allI&CequipmentperformingCategoryAtoCategoryCfunctions(inaccordancewiththeIEC61226[11]categorisationscheme);

allelectricalequipmentnecessarytoensureemergencyenergysupplytothisequipmentincaseofalossofnormalpowersupply;

allelectricalequipmentnecessarytoensureultimateenergysupplyincaseoftotallossofon-sitepower(ifselectedasdesignextensionconditiontobemitigated).

ForusageconsistentwithotherIEEEdocumentsandaClass1Ecategorization;forequipmentimportanttosafety,qualificationisessentialtothefollowing:

electricequipmentandsystemsthatareessentialtoemergencyreactorshutdown,containmentisolation,reactorcorecooling,andcontainmentandreactorheatremoval,or;

electricequipmentthatareotherwiseessentialinpreventingsignificantreleaseofradioactivematerialtotheenvironment.

Note2toentry:UsersofthisdocumentareadvisedthatClass1Eisafunctionalterm.EquipmentandsystemsaretobeclassifiedClass1Eonlyiftheyfulfilthefunctionslistedinthedefinition.IdentificationofsystemsorequipmentasClass1Ebasedonanythingotherthantheirfunctionisanimproperuseofthetermandshouldbeavoided.

[SOURCE:IEC/IEEE60780-323:2016,3.12]

3.5

tactileobservation

qualitativeassessmentofapolymer’sconditionthroughthephysicalexaminationoftheexteriorofamaterialasobservedbyaknowledgeablepersonwho,viaexperienceortraining,candeducedegradationbasedonthehardnessorsoftnessofthematerialbylightlybendingorpressingafingernailintothesurfaceandviatheirknowledgeandexperience,ortrainingcandeducedegradationbasedontheobservedconditiontoassessifquantitativeassessmentsarewarranted

3.6

visualobservation

qualitativeassessmentofapolymer’sconditionthroughthevisibleexaminationoftheexteriorofmaterialasobservedbyaknowledgeablepersonwho,viaexperienceortraining,candeducedegradationbasedontheobservedconditiontoassessifquantitativeassessmentsarewarranted

3.7

qualifiedcondition

conditionofanequipment,priortothestartofadesignbasisevent,forwhichtheequipmentwasdemonstratedtomeetthedesignrequirementsforthespecifiedserviceconditions.Thiscouldincludecertainpostaccidentcoolingandmonitoringsystemsthatareexpectedto