ML003716123

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Request for Review of Report Entitled Assessment of Risk Significance Associated with Issues Identified at D.C. Cook Nuclear Power Plant
ML003716123
Person / Time
Issue date: 05/05/2000
From: Sunil Weerakkody
Office of Nuclear Regulatory Research
To: Ralph Beedle, Drake A, Lochbaum D, Marston T, Solymossy J
Electric Power Research Institute, Institute of Nuclear Power Operations (INPO), Nuclear Energy Institute, Union of Concerned Scientists, Westinghouse
References
Download: ML003716123 (11)
v • d • e


Text

Mr.AndrewDrake,ProjectManagerWestinghouseOwnersGroup WestinghouseElectricCorporation MailStopECE5-16 P.O.Box355 Pittsburgh,PA15230-0355

DearMr.Drake:

SUBJECT:

REQUESTFORREVIEWOFREPORTENTITLED"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOK NUCLEARPOWERPLANT"Attachedforyourinformationandreviewisthedraftreportentitled"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOKNUCLEAR POWERPLANT."Thisreportdocumentstheassessmentoftherisksignificanceof141issues identifiedattheDonaldC.CookNuclearPlant,Units1and2(Cook)sinceAugust1997.TheOperatingExperienceRiskAnalysisBranchoftheofficeofNuclearRegulatoryResearch(RES)conductedthisassessmentaspartoftheagency'sAccidentSequencePrecursor(ASP)

Program.Inperformingthisassessment,theRESstaffappliedtheASPmethodologyto estimatetherisksignificanceassociatedwitheachissueaswellastheintegratedrisk significanceassociatedwiththecombinedissues.Outof141issuesanalyzed,fiveissueswereidentifiedtobepotentialaccidentsequenceprecursors.Thepreliminaryestimateofthetotalchangeincoredamagefrequency(ÿCDF)resultingfromallissuesidentifiedatCookwasapproximately4.7x10

-4/yearforeachoftheCookunits.Therisksignificanceofthecombinedimpactofallcontainment-relatedissueswas determinedtobesmall.Weplantofinalizetheabovefindingsafteraddressinginternaland externalpeerreviewcomments.Severalhigh-energylinebreak(HELB)relatedissues,degradedseismiccapacities,andpotentialpressurelockingconditionsintwomotor-operatedvalveswerethedominant contributorstothecoredamagefrequency(CDF)increase.ThepostulatedHELBscenarios contributeda

ÿCDFof3.9x10

-4/year.TheCDFincreaseattributedtothedegradedseismiccapacityofblockwallsandthedegradedseismiccapacityoftheemergencyservicewater pumpbackwashsystemwasalsoadominantcontributor,whichcontributeda

ÿCDFofapproximately4.2x10

-5/year.Themediumandlargelossofcoolant-accident(LOCA)sequencesassociatedwiththepotentialpressurelockingconditionsinthemotor-operated valveslocatedinthesuctionpathtotheresidualheatremovalpumpsfromthecontainment recirculationsumpcontributeda

ÿCDFof3.6x10

-5/year.

MultipleAddressees2Inaccordancewithourpeerreviewprocess,priortothedistributionofthefinalreport,wewanttoprovideyouwiththeopportunitytoreviewandcommentontheattacheddraftreport.In ordertomeetourplannedpublicationschedule,wewouldappreciatereceivingyourcomments within60daysfromreceiptofthisletter.AcopyofthisdraftreportandletterarebeingplacedinthePublicDocumentRoomat2120LStreetNW,Washington,DC20555.Ifyouhaveanyquestionsrelatedtothisreport,pleasecontactDr.SunilWeerakkodyofmystaffat301-415-6374ore-mail:sdw1@nrc.gov.Sincerely,ThomasL.King,DirectorDivisionofRiskAnalysisandApplications OfficeofNuclearRegulatoryResearch

Attachment:

Asstated ccw/oatt:A.Thadani,RES M.Federline,RES S.Collins,NRR R.Zimmerman,NRR B.Sheron,NRR MultipleAddressees3MEMORANDUMDATED://00

SUBJECT:

REQUESTFORREVIEWOFREPORTENTITLED"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOK NUCLEARPOWERPLANT"Distributionw/att.

OERABRF DRAARF FileCenter

PublicIDENTICALLETTERSMr.AndrewDrake,ProjectManagerDr.TheodoreU.MarstonWestinghouseOwnersGroupVicePresidentandChiefNuclearOfficer WestinghouseElectricCorporationEPRI MailStopECE5-163412HillviewAvenue P.O.Box355PaloAlto,CA94304 Pittsburgh,PA15230-0355Mr.RalphE.BeedleMr.DavidA.LochbaumSeniorVicePresidentandChiefNuclearOfficerUnionofConcernedScientists NuclearGenerationDivision1616PStreet,N.W.

NuclearEnergyInstituteSuite310 1776IStreetN.W.Washington,D.C.20035-1495 Suite400 Washington,D.C.20006-3708Mr.JosephM.SolymossyDirectorofProjectServices InstituteofNuclearPowerOperations 700GalleriaParkway,NW Atlanta,GA30339-5957DOCUMENTNAME:A:\EXT-REVIEW-COOK.WPDToreceiveacopyofthisdocument,indicateinthebox:"C"=Copywo/encl"E"=Copyw/encl"N"=NocopyOFFICEOERABOERABOERABOERABNAMESWeerakkodySMaysPBaranowskyTKing DATE//00//00//00//00OFFICIALRECORDCOPY(RESFileCode)RES2C-3AccessionNumber:ML003716123 TemplateNumber:RES-006 Dr.TheodoreU.MarstonVicePresidentandChiefNuclearOfficer

EPRI 3412HillviewAve.

PaloAlto,CA94304

DearDr.Marston:

SUBJECT:

REQUESTFORREVIEWOFREPORTENTITLED"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOK NUCLEARPOWERPLANT"Attachedforyourinformationandreviewisthedraftreportentitled"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOKNUCLEAR POWERPLANT."Thisreportdocumentstheassessmentoftherisksignificanceof141issues identifiedattheDonaldC.CookNuclearPlant,Units1and2(Cook)sinceAugust1997.TheOperatingExperienceRiskAnalysisBranchoftheofficeofNuclearRegulatoryResearch(RES)conductedthisassessmentaspartoftheagency'sAccidentSequencePrecursor(ASP)

Program.Inperformingthisassessment,theRESstaffappliedtheASPmethodologyto estimatetherisksignificanceassociatedwitheachissueaswellastheintegratedrisk significanceassociatedwiththecombinedissues.Outof141issuesanalyzed,fiveissueswereidentifiedtobepotentialaccidentsequenceprecursors.Thepreliminaryestimateofthetotalchangeincoredamagefrequency(ÿCDF)resultingfromallissuesidentifiedatCookwasapproximately4.7x10

-4/yearforeachoftheCookunits.Therisksignificanceofthecombinedimpactofallcontainment-relatedissueswas determinedtobesmall.Weplantofinalizetheabovefindingsafteraddressinginternaland externalpeerreviewcomments.Severalhigh-energylinebreak(HELB)relatedissues,degradedseismiccapacities,andpotentialpressurelockingconditionsintwomotor-operatedvalveswerethedominant contributorstothecoredamagefrequency(CDF)increase.ThepostulatedHELBscenarios contributeda

ÿCDFof3.9x10

-4/year.TheCDFincreaseattributedtothedegradedseismiccapacityofblockwallsandthedegradedseismiccapacityoftheemergencyservicewater pumpbackwashsystemwasalsoadominantcontributor,whichcontributeda

ÿCDFofapproximately4.2x10

-5/year.Themediumandlargelossofcoolant-accident(LOCA)sequencesassociatedwiththepotentialpressurelockingconditionsinthemotor-operated valveslocatedinthesuctionpathtotheresidualheatremovalpumpsfromthecontainment recirculationsumpcontributeda

ÿCDFof3.6x10

-5/year.

Mr.RalphE.BeedleSeniorVicePresidentandChiefNuclearOfficer NuclearGenerationDivision NuclearEnergyInstitute 1776IStreetN.W.

Suite400 Washington,D.C.20006-3708

DearMr.Beedle:

SUBJECT:

REQUESTFORREVIEWOFREPORTENTITLED"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOK NUCLEARPOWERPLANT"Attachedforyourinformationandreviewisthedraftreportentitled"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOKNUCLEAR POWERPLANT."Thisreportdocumentstheassessmentoftherisksignificanceof141issues identifiedattheDonaldC.CookNuclearPlant,Units1and2(Cook)sinceAugust1997.TheOperatingExperienceRiskAnalysisBranchoftheofficeofNuclearRegulatoryResearch(RES)conductedthisassessmentaspartoftheagency'sAccidentSequencePrecursor(ASP)

Program.Inperformingthisassessment,theRESstaffappliedtheASPmethodologyto estimatetherisksignificanceassociatedwitheachissueaswellastheintegratedrisk significanceassociatedwiththecombinedissues.Outof141issuesanalyzed,fiveissueswereidentifiedtobepotentialaccidentsequenceprecursors.Thepreliminaryestimateofthetotalchangeincoredamagefrequency(ÿCDF)resultingfromallissuesidentifiedatCookwasapproximately4.7x10

-4/yearforeachoftheCookunits.Therisksignificanceofthecombinedimpactofallcontainment-relatedissueswas determinedtobesmall.Weplantofinalizetheabovefindingsafteraddressinginternaland externalpeerreviewcomments.Severalhigh-energylinebreak(HELB)relatedissues,degradedseismiccapacities,andpotentialpressurelockingconditionsintwomotor-operatedvalveswerethedominant contributorstothecoredamagefrequency(CDF)increase.ThepostulatedHELBscenarios contributeda

ÿCDFof3.9x10

-4/year.TheCDFincreaseattributedtothedegradedseismiccapacityofblockwallsandthedegradedseismiccapacityoftheemergencyservicewater pumpbackwashsystemwasalsoadominantcontributor,whichcontributeda

ÿCDFofapproximately4.2x10

-5/year.Themediumandlargelossofcoolant-accident(LOCA)sequencesassociatedwiththepotentialpressurelockingconditionsinthemotor-operated valveslocatedinthesuctionpathtotheresidualheatremovalpumpsfromthecontainment recirculationsumpcontributeda

ÿCDFof3.6x10

-5/year.

Mr.DavidA.LochbaumUnionofConcernedScientists 1616PStreet,N.W.

Suite310 Washington,D.C.20035-1495

DearMr.Lochbaum:

SUBJECT:

REQUESTFORREVIEWOFREPORTENTITLED"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOK NUCLEARPOWERPLANT"Attachedforyourinformationandreviewisthedraftreportentitled"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOKNUCLEAR POWERPLANT."Thisreportdocumentstheassessmentoftherisksignificanceof141issues identifiedattheDonaldC.CookNuclearPlant,Units1and2(Cook)sinceAugust1997.TheOperatingExperienceRiskAnalysisBranchoftheofficeofNuclearRegulatoryResearch(RES)conductedthisassessmentaspartoftheagency'sAccidentSequencePrecursor(ASP)

Program.Inperformingthisassessment,theRESstaffappliedtheASPmethodologyto estimatetherisksignificanceassociatedwitheachissueaswellastheintegratedrisk significanceassociatedwiththecombinedissues.Outof141issuesanalyzed,fiveissueswereidentifiedtobepotentialaccidentsequenceprecursors.Thepreliminaryestimateofthetotalchangeincoredamagefrequency(ÿCDF)resultingfromallissuesidentifiedatCookwasapproximately4.7x10

-4/yearforeachoftheCookunits.Therisksignificanceofthecombinedimpactofallcontainment-relatedissueswas determinedtobesmall.Weplantofinalizetheabovefindingsafteraddressinginternaland externalpeerreviewcomments.Severalhigh-energylinebreak(HELB)relatedissues,degradedseismiccapacities,andpotentialpressurelockingconditionsintwomotor-operatedvalveswerethedominant contributorstothecoredamagefrequency(CDF)increase.ThepostulatedHELBscenarios contributeda

ÿCDFof3.9x10

-4/year.TheCDFincreaseattributedtothedegradedseismiccapacityofblockwallsandthedegradedseismiccapacityoftheemergencyservicewater pumpbackwashsystemwasalsoadominantcontributor,whichcontributeda

ÿCDFofapproximately4.2x10

-5/year.Themediumandlargelossofcoolant-accident(LOCA)sequencesassociatedwiththepotentialpressurelockingconditionsinthemotor-operated valveslocatedinthesuctionpathtotheresidualheatremovalpumpsfromthecontainment recirculationsumpcontributeda

ÿCDFof3.6x10

-5/year.

Mr.JosephM.SolymossyDirectorofProjectServices InstituteofNuclearPowerOperations 700GalleriaParkway,NW Atlanta,GA30339-5957

DearMr.Solymossy:

SUBJECT:

REQUESTFORREVIEWOFREPORTENTITLED"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOK NUCLEARPOWERPLANT"Attachedforyourinformationandreviewisthedraftreportentitled"ASSESSMENTOFRISKSIGNIFICANCEASSOCIATEDWITHISSUESIDENTIFIEDATD.C.COOKNUCLEAR POWERPLANT."Thisreportdocumentstheassessmentoftherisksignificanceof141issues identifiedattheDonaldC.CookNuclearPlant,Units1and2(Cook)sinceAugust1997.TheOperatingExperienceRiskAnalysisBranchoftheofficeofNuclearRegulatoryResearch(RES)conductedthisassessmentaspartoftheagency'sAccidentSequencePrecursor(ASP)

Program.Inperformingthisassessment,theRESstaffappliedtheASPmethodologyto estimatetherisksignificanceassociatedwitheachissueaswellastheintegratedrisk significanceassociatedwiththecombinedissues.Outof141issuesanalyzed,fiveissueswereidentifiedtobepotentialaccidentsequenceprecursors.Thepreliminaryestimateofthetotalchangeincoredamagefrequency(ÿCDF)resultingfromallissuesidentifiedatCookwasapproximately4.7x10

-4/yearforeachoftheCookunits.Therisksignificanceofthecombinedimpactofallcontainment-relatedissueswas determinedtobesmall.Weplantofinalizetheabovefindingsafteraddressinginternaland externalpeerreviewcomments.Severalhigh-energylinebreak(HELB)relatedissues,degradedseismiccapacities,andpotentialpressurelockingconditionsintwomotor-operatedvalveswerethedominant contributorstothecoredamagefrequency(CDF)increase.ThepostulatedHELBscenarios contributeda

ÿCDFof3.9x10

-4/year.TheCDFincreaseattributedtothedegradedseismiccapacityofblockwallsandthedegradedseismiccapacityoftheemergencyservicewater pumpbackwashsystemwasalsoadominantcontributor,whichcontributeda

ÿCDFofapproximately4.2x10

-5/year.Themediumandlargelossofcoolant-accident(LOCA)sequencesassociatedwiththepotentialpressurelockingconditionsinthemotor-operated valveslocatedinthesuctionpathtotheresidualheatremovalpumpsfromthecontainment recirculationsumpcontributeda

ÿCDFof3.6x10

-5/year.

ROUTINGANDTRANSMITTALSLIPDate5/2/00TO:(Name,officesymbol,room#,building,agency/post)InitialsDate1.S.Weerakkody-Concur2.S.Mays-Concur 3.P.Baranowsky-Concur 4.T.King-Concur/Signature 5.

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10.ActionFileNoteandReturnApprovalForClearancePerConversation AsRequestedForCorrectionPrepareReply CirculateForYourInformationSeeMe CommentInvestigate XConcurrence/SignatureCoordinationJustifyREMARKSIdenticalLetters.FROM:(Name,org.symbol,Agency/Post)Room#-Bldg.Phone#

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