ML010320536: Difference between revisions
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| issue date = 02/01/2001 | | issue date = 02/01/2001 | ||
| title = Letter to Mr. Modeen, Nei - Nuclear Energy Institute/Electric Power Research Institute Fire Testing: Comprehensiveness with Respect to Outstanding Circuit Analysis Issues | | title = Letter to Mr. Modeen, Nei - Nuclear Energy Institute/Electric Power Research Institute Fire Testing: Comprehensiveness with Respect to Outstanding Circuit Analysis Issues | ||
| author name = Hannon J | | author name = Hannon J | ||
| author affiliation = NRC/NRR/DSSA/SPLB | | author affiliation = NRC/NRR/DSSA/SPLB | ||
| addressee name = Modeen D | | addressee name = Modeen D | ||
| addressee affiliation = Nuclear Energy Institute (NEI) | | addressee affiliation = Nuclear Energy Institute (NEI) | ||
| docket = | | docket = | ||
Revision as of 09:30, 14 July 2019
| ML010320536 | |
| Person / Time | |
|---|---|
| Issue date: | 02/01/2001 |
| From: | Hannon J Plant Systems Branch |
| To: | Modeen D Nuclear Energy Institute |
| whitney l | |
| References | |
| TAC MA4720 | |
| Download: ML010320536 (5) | |
Text
February1,2001Mr.DavidJ.Modeen,DirectorEngineering NuclearEnergyInstitute 1776IStreet,NWSuite400 Washington,DC20006
SUBJECT:
NUCLEARENERGYINSTITUTE/ELECTRICPOWERRESEARCHINSTITUTEFIRETESTING:COMPREHENSIVENESSWITHRESPECTTO OUTSTANDINGCIRCUITANALYSISISSUES(TACNO.MA4745)
DearMr.Modeen:
Thepurposeofthisletteristorequestadditionalinformationwithregardtofire-inducedcircuitfailureanalyticalcriteriaidentifiedintheNuclearEnergyInstitute's(NEI)riskinformedsafe shutdownmethodology,NEI00-01,andyourapproachestorelatedcircuitfailureanalysis issuesresolution.TheBoilingWaterReactorOwner'sGroup's(BWROG)finaldeterministicpost-firesafeshutdownmethodologyguidancedocument,fromwhichNEI00-01wasderived,wasthe subjectofanextensiveCY2000NRCstaffRequestforAdditionalInformation(RAI).The BWROGdocumentcontainednumerousexamplesofcircuitanalysiscriteria.Wenotethat,as usefulastheBWROGeffortwasinidentifyingthesecircuitanalysiscriteria,theBWROGeffort didnotprovidetechnicalbasesforthosecriteria.DuringaJuly26,2000,publicmeetingto discussthestaff'sRAI,theBWROGrepresentativesstatedthatallofthecircuitanalysiscriteria containedintheirdeterministicdocumenthadbeencollectedfromexistingoperatingreactor licensingbases,andthatnocircuitanalysisissuesoutsideoftheselicensingbasesappearedto besafetysignificant.Therefore,intheopinionoftheBWROG,technicalbaseswerenot required.Itisthestaff'spositionthatthetechnicalbasesofallofthecircuitanalysiscriteriarelieduponinNEI00-01shouldbeprovided.Thetechnicalbasesarenecessaryforthestafftoassessthe adequacyofthecriteria,anditsapplicabilityonanindustry-widebasis.Thefollowingissueswereidentifiedinthestaff'sRAIontheBWROGdocument.ItisuncleartotheNRCstaffwhatmethodwillbeusedtocloseeachoftheseissues(e.g.firetests,expert elicitationpanels,probabilisticarguments,etc.).Thestaffunderstandsthat,forcircuitanalysis issuesthatcannotbeaddressedthroughtesting,othertechnicallydefensibleapproachesto resolutionmaybeappropriate.Pleaseprovideabriefexplanationofthemethodintendedto closeeachoftheseissues,andNEI'sschedulefortheirclosure:
D.Modeen21.Determinationofthenumberofspuriousequipmentactuations(orsetsofspuriousactuations)tobeassumedperfireevent,and(eventhoughthespuriousactuationsmay notoccursimultaneously)whetherthespuriousactuationsaretobeassumedto eventuallyexistconcurrentlyifnotpurposelymitigatedorotherwiseaddressedbythe licensee.2.Determinationofthenumberofconcurrentlyexistingfire-inducedcablefailures/circuitfaultstobeassumedperfirewhichcancooperativelycausespuriousequipment actuations.3.Thetimingofcablefailuresandtheirresultantcircuitfaults.
4.Theprobabilityofconductor-to-conductorelectricalinteractioninmulti-conductorcablesandcablesincontact.5.Cablefailureprobabilitydependencyoncircuitdesign(e.g.,ashorttogroundmaybemoreproblematicinagroundedcontrolcircuitthaninothercontrolcircuitdesigns).6.Theeffectofcertaincablematerialconsiderations(e.g.,thermosetversusthermoplastic)oncablefailureprobability.7.Theeffectofvariationsinfireintensity/firesizeoncablefailureprobability.
8.Theprobabilityofconductor-to-conductorelectricalinteractionforcablesinthesametray,andcablesindifferenttraysinthesameroom(whichmayforexample,beseparated verticallybutnothorizontally).9.Controlroomcabinettocabinetfire,hotgasandsmokepropagation.
10.Theprobabilityofunsuppressedfiresandtheprobabilityofadamagingfire,aswellastheeffectonfireseverityandfireconsequenceestimatesof(1)timefrominceptionto effectivesuppression,and(2)firelocationcharacteristicshavinguniquepotentialfor causingsevereplantdamageand/orinterferingwithpost-firesafeshutdown.11.Thetechnicalbasisforyourpositiononspuriousequipmentoperationleadingtomechanisticdamageasaresultofoneormorefire-inducedcablefailures/circuitfaults(seeIN92-18).12.ThetechnicalbasisforyourassumptionthatMultipleHighImpedanceFault(MHIF)electricalarcsclearthrougheither(1)adevelopedopencircuitor(2)adevelopedhigh current"boltedshort"(whichinturnactuatesacircuitinterruptiondevice).13.Variouscircuitdesignspecificassumptionsofinherentsafety(e.g.,"indicationcircuitsarenotasafetyprobleminfires,""certainmotorscan'tfailduetotheirdesign").SincestaffhasbeennotifiedthatNEIhasintegratedthedeterministicBoilingWaterReactorOwner'sGroup(BWROG)SafeShutdownGuidanceDocumentwithinNEI00-01,wenowplan toissueonlyasinglesafetyevaluationreport(SER)uponcompletionofNEI00-01(ratherthan twoSERs,oneforeachoftheNEIandBWROGdocuments).
D.Modeen3Thestaffcontinuestobelievethattimelyresolutionoffire-inducedcircuitfailureissuesthroughavoluntaryindustryinitiativeisappropriate.Ifthereareanyquestions,pleasecontactJoe Birminghamat(301)415-2829orLeonWhitneyat(301)415-3081.Sincerely,
/RA/JohnHannon,ChiefPlantSystemsBranch DivisionofSystemsSafetyandAnalysis OfficeofNuclearReactorRegulationProjectNo.689cc:Seelist D.Modeen3Thestaffcontinuestobelievethattimelyresolutionoffire-inducedcircuitfailureissuesthroughavoluntaryindustryinitiativeisappropriate.Ifthereareanyquestions,pleasecontactJoe Birminghamat(301)415-2829orLeonWhitneyat(301)415-3081.Sincerely,
/RA/JohnHannon,ChiefPlantSystemsBranch DivisionofSystemsSafetyandAnalysis OfficeofNuclearReactorRegulationProjectNo.689cc:SeelistDISTRIBUTION:PUBLICGHolahanRGardner,RIIIJBirminghamBSheronJHannonEWeissGMizunoSCollins/RZimmerman JJohnsonRPulsiferLWhitneyJShackelford,RIVJCalvo WRuland,RINSiu,RESRJenkinsKLandis,RIIHWoods,RES MSalleyDOCUMENTNAME:G:\SectionB\Whitney\NEIfiretestcomprehensiveness*seepreviousconcurrenceOFFICIALRECORDCOPYOFFICE*DSSA\SPLB*DSSA\SPLB*RES\DRAA\PRABDSSA\SPLBNAMELWhitneyEWeissHWoodsJHannon DATE2/1/002/1/0010/26/002/1/00 D.Modeen4NuclearEnergyInstituteProjectNo.689cc:Mr.RalphBeedleMs.LynnetteHendricks,DirectorSeniorVicePresidentPlantSupportandChiefNuclearOfficerNuclearEnergyInstituteNuclearEnergyInstituteSuite400 Suite4001776IStreet,NW 1776IStreet,NWWashington,DC20006-3708 Washington,DC20006-3708Mr.AlexMarion,DirectorMr.CharlesB.Brinkman,DirectorProgramsWashingtonOperations NuclearEnergyInstituteABB-CombustionEngineering,Inc.
Suite40012300TwinbrookParkway,Suite330 1776IStreet,NWRockville,Maryland20852 Washington,DC20006-3708Mr.JimDavis,DirectorMr.FredEmerson,ProjectManagerOperationsEngineering NuclearEnergyInstituteNuclearEnergyInstitute Suite400Suite400 1776IStreet,NW1776IStreet,NW Washington,DC20006-3708Washington,DC20006-3708Mr.AnthonyPietrangelo,DirectorJamesM.Kenny,ChairmanLicensingBWROwner'sGroup NuclearEnergyInstitutePPL,Inc.
Suite4002NorthNinthStreetM/CA6-1 1776IStreet,NWAllentown,PA18101 Washington,DC20006-3708Mr.H.A.Sepp,ManagerThomasGormanRegulatoryandLicensingEngineeringPPL,Inc.
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