ML15147A057

6/9/2015, Meeting Slide for Browns Ferry Nuclear Plant Regarding Extended Power Uprate License Amendment Request Flow Induced Vibration Monitoring Program

ML15147A057
Person / Time
Site:	Browns Ferry
Issue date:	06/09/2015
From:	Doyle G Tennessee Valley Authority
To:	Plant Licensing Branch II
Buckberg P, NRR/DORL/LPL2-2 301-415-1383
References
Download: ML15147A057 (17)

Text

Browns Ferry Nuclear Plant Extended Power Uprate License Amendment Request Flow Induced Vibration Monitoring Program Gerry Doyle Director EPU June 9, 2015

BFN EPU - Agenda Browns Ferry EPU License Amendment Request FIV Monitoring Program

Introductions

OverviewandSchedule BrownsFerryNuclearPlantFlowInducedVibration(FIV)

MonitoringProgram Questions/Comments G.Doyle G.Doyle P.Donahue G.Doyle l 2

BFN EPU - Overview and Schedule Browns Ferry EPU License Amendment Request FIV Monitoring Program l 3 New consolidated Browns Ferry Nuclear Plant (BFN)

Extended Power Uprate (EPU) License Amendment Request (LAR) submittal SupersedespreviousBFNEPUsubmittals AddressescurrentBFNconditionsandlicensingbasis(e.g.,AREVA ATRIUM10XMfueltype)

UsestheformatofRS001,ReviewStandardforExtendedPower Uprates AddressespreviousapplicableNRCRequestsforAdditional Information(RAIs)

Appliesimprovedsubmittalverificationprocesstoensure completenessandaccuracy WeareheretopresentanddiscussourFlowInducedVibration MonitoringProgram VibrationMonitoringProgramisconsistentwithexistingguidance Includesdiscussionsonmonitoringscopeandacceptancecriteria

BFN EPU - Overview and Schedule Browns Ferry EPU License Amendment Request FIV Monitoring Program l 4

BFN EPU - FIV Monitoring Program Browns Ferry EPU License Amendment Request FIV Monitoring Program

Background

VibrationlevelsoftheMainSteam(MS)andFeedwater (FW)pipingareexpectedto increasebyapproximately35%basedonflowincreasesofupto16%

Otherpossiblesourcesofincreasedvibration,suchasflowinstabilitiesoracoustic resonanceasaresultofincreasedflowvelocities,maycontributetoEPUvibration levels AcousticvibrationsuppressorshavebeeninstalledontheMSsystemattheBFNunitsto reducevibrationsusceptibilityofpipingandcomponents FlowratesinportionsoftheCondensate(CD),ExtractionSteam(ES)andHeaterDrains (HD)systemsincreasesimilarlytoMSandFW,andaresusceptibletoincreased vibrationatEPUconditions Confirmatorytestprogramwillbeimplementedtomonitorpipingandattached componentvibrationlevelsduringinitialpowerascensiontoEPUconditions VibrationstudiesassociatedwithSteamDryerreplacement,includingeffectsofReactor RecirculationPumpvanepassingfrequencieswillbeaddressedaspartofSteamDryer vibrationmonitoring l 5

Browns Ferry EPU License Amendment Request FIV Monitoring Program PreviousVibrationMonitoring

• VibrationlevelsatCurrentLicensedThermalPower(CLTP)(3458MWt)were obtainedaspartoftheBFNUnit1restartin2007

• AdditionalCLTPvibrationdatawascollectedin2008,forBFNUnit1MSand FWpipingandcomponents

• Thesetestsprovidedvibrationinformationthatledtotheinstallationof AcousticVibrationSuppressors(AVS)onBFNUnits1,2,and3

• BFNUnit1CLTPvibrationmonitoringresultsarepartofthebasisforthe vibrationmonitoringthatwillbeperformedduringEPUpowerascensionfor BFNUnits1,2,and3 l 6 BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program PreviousVibrationMonitoring(continued)

• MSandFWPipingLocationSelection

• HydraulicandstructuralmodelsoftheMSandFWpipingwerecreatedfor determinationofthevibrationmonitoringlocationsanddevelopmentofthe vibrationacceptancecriteria

• Thevibrationmonitoringlocationswereselectedbasedonthestructural timehistoryanalysisresults,wheresignificantdisplacementsoccurred relativetootherlocations

• Themeasurementlocationswerealsoselectedsuchthatthegeneraloverall pipingresponsewouldbereflectedinthedataanditwouldnotbelikely thatsignificantvibrationswouldbemissed l 7 BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program PreviousVibrationMonitoring(continued)

• AcceptanceCriteriaDevelopment

• Allowabledisplacementandaccelerationlimitsattheselectedmeasurement locationswerecalculatedbasedontheanalysisresultsandAmericanSociety ofMechanicalEngineers(ASME)codefatiguestresslimitsforsteadystate vibrationconsistentwithASMEOMS/G,Part3(OM3)

• Theprimaryacceptancecriteriaareintermsofdisplacement,whichis directlyproportionaltopipestress

• Secondaryacceptancecriteriaintermsofaccelerationweredeterminedfor locationswhereaccelerometersareusedformonitoring l 8 BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program PreviousVibrationMonitoring(continued)

• AcceptanceCriteriaDevelopment

• ThedisplacementlimitsforMSandFWareapplicableforvibration frequenciesupto50Hz,whichcorrespondstothefrequencyrangeinwhich themostsignificantstructuraldisplacementresponsesareexpected

• Pipingdisplacementsduetoexcitationfrequenciesabove50Hzaretypically insignificantrelativetothelowerfrequencydisplacements

• SecondaryaccelerationlimitsestablishedfortheFWpipinginside containmentarealsoapplicableforfrequenciesupto50Hz,sincesignificant forcingfrequenciesandstructuralresponsesabove50Hzarenotexpectedin theFWsystem

• AcceptanceCriteriausedduringpreviousvibrationmonitoringtobeapplied toEPUvibrationmonitoring l 9 BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program OperatingExperience

• NEDO33159,ExtendedPowerUprateLessonsLearnedandRecommendations

• SignificantEventReport(SER)206,OperatingExperience(OE)22641atQuad CitiesandrecentNRCfinding(Dresden)- MainSteamReliefValve(MSRV) failuresrelatedtovibration

• InstituteofNuclearPowerOperations(INPO)Report1322FeedRegulator ValveFailure-AirsupplylinefailureduetohighvibrationatWaterford

• INPOReport1281SteamBypassControlValveFailures-Vibrationrelated SteamBypassControlSystemfailuresatStLucie

• BFNcomponentspecificevaluationsbasedonOE-FatigueandWear

• MSRVs-TargetRockSolenoidValvesandPilotAssemblies,Temperature Elements

• MSIVs-LimitSwitches

• MS,HPCI,RCICValveOperatorsandLimitSwitches l 10 BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program l 11 EPUVibrationMonitoring

• MSandFWMonitoringScope

• InsideContainmentMSandFW

• MSPiping:7monitoringlocations,12measurements (1or2directionsperlocation)

• FWPiping:9monitoringlocations,14measurements (1or2directionsperlocation)

• MSComponents:8monitoringlocations,24measurements (3directionsperlocation)

• OutsideContainmentMSandFW

• MSpiping:11monitoringlocations,20measurements (1to3directionsperlocation)

• FWpiping:13monitoringlocations,23measurements (1or2directionsperlocation)

BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program l 12 EPUVibrationMonitoring(continued)

• ComponentMonitoringScope

• BFNoperatinghistoryindicatesthatexcessivecomponentvibrations shouldbenotexpectedatEPUconditions

• Inordertoprovideconfirmationthatcomponentvibrationswillbe withinacceptablelimitsatEPUconditions,selectedcomponentswill beinstrumentedwithaccelerometers

• Theselectedcomponentsinclude:

• Foursafetyreliefvalves(SRV)

• Onemainsteamisolationvalve(MSIV)

• InboardisolationvalvefortheMSdrainpiping

• Inboardisolationvalveforthereactorcoreisolationcooling(RCIC) turbinesteamsupplyline

• Inboardisolationvalveforthehighpressurecoolantinjection(HPCI) turbinesteamsupplyline BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program l 13 EPUVibrationMonitoring(continued)

• BalanceofPlant(BOP)SystemsMonitoringScope

• CondensateSystem

• TheCDpipingbetweenthe3rd stagefeedwater heatersandthe reactorfeedwater pumps(RFPs)aswellastheCDpipingbetween the4th stagefeedwater heatersandthe3rd stagefeedwater heaters wereselectedforEPUvibrationmonitoring

• ExtractionSteamSystem

• TheESpipingfromthehighpressure(HP)turbinetothe1st stage feedwater heatersandtheESpipingfromthelowpressure(LP) turbinetothe2nd stagefeedwater heaterswasselectedforEPU vibrationmonitoring

• HeaterDrainsSystem

• TheHDsystembetweenthe1st and2nd stagefeedwater heatersand betweenthe2nd and3rd stagefeedwater wasselectedforEPU vibrationmonitoring BFN EPU - FIV Monitoring Program

EPUVibrationMonitoring(continued)

• SmallBorePipingSusceptibilityEvaluation

• Considerations

• Thepresenceorabsenceofatiebacksupport

• Theroutingandsupportconfigurationsofthesmallborelines

• Lineswithunsupportedconcentratedmassesorlong,unsupportedruns

• Theexpectedamplitudesoftheheadervibrations

• Smallborelinesincludedinthelargeborepipingmodels

• Thetimehistoryanalysisresultsareusedtodeterminethesusceptibilityof thesmallborelinestotheheaderinducedvibrations

• Potentiallysusceptibleconfigurationswillbeidentifiedandaddressed

• Anynecessarymodificationsidentifiedintheanalysiswillbemade priortoEPUpowerascension

• Previousstudiesidentified10locationsforEPUmonitoringstudies

• AdditionallocationsforEPUmonitoringmaybeidentifiedasaresultofthe susceptibilityevaluation Browns Ferry EPU License Amendment Request FIV Monitoring Program l 14 BFN EPU - FIV Monitoring Program

Browns Ferry EPU License Amendment Request FIV Monitoring Program Conclusions

• ReviewofpreviousvibrationdatacollectedduringBFNUnit1restartpower ascensiontestingindicatesCLTPvibrationlevelswellwithinacceptablelimits

• ExtrapolationoftheCLTPdatatoEPUpowerlevelsindicatesthatvibrationof pipingandcomponentswillnotbeadverselyaffectedbyEPUoperation

• Pipingandattachedcomponentsonsystemsexperiencingsignificantflow increasesasaresultofEPUwillbeincludedinthevibrationmonitoring program

• PipingvibrationacceptancecriteriaisbasedonASMEOM3

• Componentvibrationacceptancecriteriaisbasedoncomponentspecific dynamiccharacteristicsandindustryexperience

• Smallborepipingassessmentswillbeperformedtoidentifypotentially susceptibleconfigurations,andanymodificationsrequiredtoreducevibration susceptibilitywillbemadepriortoEPUpowerascension l 15 BFN EPU - FIV Monitoring Program

BFN EPU - Acronym List Browns Ferry EPU License Amendment Request FIV Monitoring Program l 16 ASME-AmericanSocietyofMechanical Engineers AVS-AcousticVibrationSuppressors BFN-BrownsFerryNuclearPlant BOP-BalanceofPlant CD-Condensate CLTP-CurrentLicensedThermalPower EPU-ExtendedPowerUprate ES-ExtractionSteam FW-Feedwater HD-HeaterDrains HP-HighPressure HPCI-HighPressureCoolantInjection Hz-Hertz INPO-InstituteofNuclearPower Operations LAR-LicenseAmendmentRequest LP-LowPressure MS-MainSteam MSIV-MainSteamIsolationValve MSRV-MainSteamReliefValve MWt - MegawattThermal NRC-NuclearRegulatoryCommission OE-OperatingExperience OLTP-OriginalLicensedThermalPower RAI-RequestforAdditionalInformation RCIC-ReactorCoreIsolationCooling RFP-ReactorFeedwater Pump SER-SignificantEventReport SRV-SafetyReliefValve

BFN EPU - Questions/Comments Browns Ferry EPU License Amendment Request FIV Monitoring Program l 17