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| issue date = 05/05/2000 | | issue date = 05/05/2000 | ||
| title = Request for Review of Report Entitled Assessment of Risk Significance Associated with Issues Identified at D.C. Cook Nuclear Power Plant | | title = Request for Review of Report Entitled Assessment of Risk Significance Associated with Issues Identified at D.C. Cook Nuclear Power Plant | ||
| author name = Weerakkody S | | author name = Weerakkody S | ||
| author affiliation = NRC/RES | | author affiliation = NRC/RES | ||
| addressee name = Beedle R | | addressee name = Beedle R, Drake A, Lochbaum D, Marston T, Solymossy J | ||
| addressee affiliation = Electric Power Research Institute (EPRI), Institute of Nuclear Power Operations (INPO), Nuclear Energy Institute (NEI), Union of Concerned Scientists, Westinghouse Electric Co | | addressee affiliation = Electric Power Research Institute (EPRI), Institute of Nuclear Power Operations (INPO), Nuclear Energy Institute (NEI), Union of Concerned Scientists, Westinghouse Electric Co | ||
| docket = | | docket = |
Revision as of 11:26, 14 July 2019
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) | |
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.
6.
7.
8.
9.
10.ActionFileNoteandReturnApprovalForClearancePerConversation AsRequestedForCorrectionPrepareReply CirculateForYourInformationSeeMe CommentInvestigate XConcurrence/SignatureCoordinationJustifyREMARKSIdenticalLetters.FROM:(Name,org.symbol,Agency/Post)Room#-Bldg.Phone#