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{{#Wiki_filter:NIAGARAMOHAWKPOWERCORPORATIONNINEMILEPOINTUNIT1NUCLEARPOWERSTATIONREPORTOFREACTORPRESSUREVESSELFEEDWATERANDCONTROLRODDMVERETURNLINENOZZLEEXAMINATIONSperformedforNUREG0619BWRFEEDWATERNOZZLEANDCONTROLRODDRIVERETURNLINENOZZLECRACKINGattheculminationofREFUELINGOUTAGENO.13whichendedonApril4,1995ThisdocumentcompletedSEPTEMBER29,19959510100318951003PDRADOCK05000220,,P...,PDR,,
{{#Wiki_filter:NIAGARAMOHAWKPOWERCORPORATION NINEMILEPOINTUNIT1NUCLEARPOWERSTATIONREPORTOFREACTORPRESSUREVESSELFEEDWATERANDCONTROLRODDMVERETURNLINENOZZLEEXAMINATIONS performed forNUREG0619BWRFEEDWATER NOZZLEANDCONTROLRODDRIVERETURNLINENOZZLECRACKINGattheculmination ofREFUELING OUTAGENO.13whichendedonApril4,1995Thisdocumentcompleted SEPTEMBER 29,19959510100318 951003PDRADOCK05000220,,P...,PDR,,
l~Q NMP1RPVFEEDWATERANDCRDRLNOZZLEEXAMINATIONS1995REFUELINGOUTAGE(RFO-13)TABLEFCNTENTSINTRODUCTION...................................1ACKGROUND....................................1BRESULTSOFEXAMINATIONS.........................2MODIFICATIONSANDSYSTEMCHANGES................2STARTUP/SHUTDOWNCYCLES........................3LEAKAGEMONITORING.............................3VlaARYe~~~~~~~~~~~~~~~~~'o~~~~~~~~~~~~~~~~~~~~3SEFERENCESe~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~o~~~~~5RAPPENDICESA.FEEDWATERANDCONTROLRODDRIVERETURN.....7LINENOZZLEINSPECTIONRESULTSB.MODIFICATIONSORSYSTEMCHANGESTHAT.......15AFFECTFEEDWATERFLOWORTEMPERATUI&C.ULTRASONICEXAMINATIONTECHNIQUES..........16  
l~Q NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)TABLEFCNTENTSINTRODUCTION
...................................
1ACKGROUND
....................................1 BRESULTSOFEXAMINATIONS
.........................
2MODIFICATIONS ANDSYSTEMCHANGES................
2STARTUP/SHUTDOWN CYCLES........................
3LEAKAGEMONITORING
.............................
3VlaARYe~~~~~~~~~~~~~~~~~'o~~~~~~~~~~~~~~~~~~~~3SEFERENCES e~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~o~~~~~5RAPPENDICES A.FEEDWATER ANDCONTROLRODDRIVERETURN.....7LINENOZZLEINSPECTION RESULTSB.MODIFICATIONS ORSYSTEMCHANGESTHAT.......15AFFECTFEEDWATER FLOWORTEMPERATUI&
C.ULTRASONIC EXAMINATION TECHNIQUES
..........
16  


~'NMP1RPVFEEDWATERANDCRDRLNOZZLEEXAMINATIONS1995REFUELINGOUTAGE(RFO-13)I.INTRODUCTIONThisreportprovidestheinformationrequiredbyNUREG-0619,"BWRFeedwaterNozzleandControlRodDriveReturnLineNozzleCracking"(November1980).Thereportincludes:Asummaryofmethodsused,theresultsoftheinserviceinspectionsofthefeedwaterandcontrolroddrivereturnline(CRDRL)nozzlesandfeedwaterspargerflowholesandweldsinspargerarmsandtees,theeffectsofmodificationsorsystemchangesonfeedwaterflowortemperature,thenumberofstartup/shutdowncycles,andadiscussionofthermalsleeveleakagemonitoring.TheinspectionswereperformedbytheGeneralElectricNuclearEnergyCorporation(GE-NE)ofSanJose,California.H.BACKGROUNDNineMilePointUnit1isa620MweBoilingWaterReactor(BWR)whichbeganoperationinNovember1969andhasbeeninserviceforapproximately26years.Duringthe1977RefuelingOutage,NiagaraMohawk(NMPC)removedtheoriginally-installedloose-fitfeedwaterspargersandreplacedthemwithanimproveddesign(single-pistonring/flowbaffleseal).Thefourfeedwaternozzleswereultrasonically(UT)examinedfromthereactorvesselexteriorusingproceduresandtechniquesdevelopedbyGeneralElectric(GE).ThisUTexaminationestablishedabaselineforsubsequentnozzleexaminations.AsrequiredbyNUREG-0312,"InterimTechnicalReportonBWRFeedwaterNozzleandControlRodDriveReturnLineNozzleCracking,"aninserviceUTanddyepenetrant(PT)examinationofthefourfeedwaternozzleswasperformedbyGEduringthe1979refuelingoutage.Nosignificantchangesfromthebaselineexaminationswereobserved.Inaddition,theReactorWaterCleanup(RWCU)returnlinewasreroutedtothefeedwaterlines.InNiagaraMohawk'sresponsetoNUREG-0619,datedDecember29,1980,wecommittedtoaprogramofperiodicinspectionsofthefeedwaterandcontrolroddrivereturnlinenozzles.ThefeedwaternozzleUTinspectionwastobeperformedeveryotherrefuelingoutageandthevisualinspection(VT)ofthefeedwaterspargerswastobeperformedeveryfourthrefuelingoutage,commencingwiththe1981outage.ThePTinspectionofthefeedwaterandcontrolroddrivereturnlinenozzleswastobeperformedeverysixthrefuelingoutageorevery90startup/shutdowncycles,whicheveroccurredfirst.ThePTInspectionintervalscommencedwiththe1979refuelingoutage,duringwhichthebaselinefeedwaternozzlePTinspectionsweremade.
~'NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)I.INTRODUCTION Thisreportprovidestheinformation requiredbyNUREG-0619, "BWRFeedwater NozzleandControlRodDriveReturnLineNozzleCracking" (November 1980).Thereportincludes:
I NMP1RPVFEEDWATERANDCRDRLNOZZLEEXA1VHNATIONS1995REFUELINGOUTAGE(RFO-13)H.BACKROUNDCont'dDuringthe1988RefuelingOutage(RFO-11),theNMPCNuclearQualityAssuranceDepartmentgeneratedCorrectiveActionRequest88.2039-01todocumentandresolvediscrepanciesinpreviousoutages'eedwaternozzleexaminationdata.Alsogeneratedduringthe1988outagewastheRestartActionPlan(RAP).OneoftheRAPspecificissuesaddressedthelackoffullvolumecoverageonfeedwaternozzlesasrequiredbyNUREG-0619.Allofthecorrectiveactionsforbothoftheseissueswereidentifiedandimplementedduringthe1988outage.The1988UTexaminationsofthefeedwaternozzlesperformedbytheNuclearEnergyServicesCo.(NES)revealedindicationsthatwouldrequiremonitoringduringthefollowingrefuelingoutage.TheUTexaminationsconductedduringRFO-12in1993offeedwaternozzle"A"wereperformedbyGeneralElectricNuclearEnergy(GE-NE).TheresultsoftheseexaminationswerepresentedinNMPC'ssubmittalofAugust25,1993(NMP1L0777)whichindicatednorecordableindicationsandresolvedthoseindicationsidentifiedin1988duringRFO-11asrequiringadditionalmonitoring.Visualexaminations(VT)ofthefeedwaterspargerflowholesandweldsinspargerarmsandteeswereperformedbyGE-NEduringRFO-11in1988andagainduringRFO-12in1993,Theseexaminationsindicatednoreportableindications.III.RULTSOFEXAMINATINTheinspectionsconductedduringRFO-13in1995wereperformedwiththeUltrasonicTest(UT)methodbyGE-NEwhichindicatednoreportableindications.TheseUTexaminationsutilizedtheGERIS2000automatedsystemandmanualUTpickupsoftheRPVnozzlesonfour(4)feedwaterandthecontrolroddrivereturnlinenozzles.TheresultsoftheseexaminationsandasummaryofallpreviousexaminationsarepresentedinAppendixAofthisreport.IV.MODIFICATIONSNUREG-0619requireslicenseestoreportallmodificationsorsystemchangesthataffectfeedwaterflowortemperatureandtoconsiderthesechangesinpredictingfuturecrackingtendencies.Sinceour1988outageNUREG-0019report,therehavebeennomodificationsorsystemchangesthataffectfeedwaterflowortemperature.AppendixBtothisreportsummarizesallapplicablephysicalandproceduralmodificationsimplementedatNineMilePointUnit1since1977whichaffectfeedwaterflowortemperature.  
Asummaryofmethodsused,theresultsoftheinservice inspections ofthefeedwater andcontrolroddrivereturnline(CRDRL)nozzlesandfeedwater spargerflowholesandweldsinspargerarmsandtees,theeffectsofmodifications orsystemchangesonfeedwater flowortemperature, thenumberofstartup/shutdown cycles,andadiscussion ofthermalsleeveleakagemonitoring.
Theinspections wereperformed bytheGeneralElectricNuclearEnergyCorporation (GE-NE)ofSanJose,California.
H.BACKGROUND NineMilePointUnit1isa620MweBoilingWaterReactor(BWR)whichbeganoperation inNovember1969andhasbeeninserviceforapproximately 26years.Duringthe1977Refueling Outage,NiagaraMohawk(NMPC)removedtheoriginally-installed loose-fit feedwater spargersandreplacedthemwithanimproveddesign(single-piston ring/flow baffleseal).Thefourfeedwater nozzleswereultrasonically (UT)examinedfromthereactorvesselexteriorusingprocedures andtechniques developed byGeneralElectric(GE).ThisUTexamination established abaselineforsubsequent nozzleexaminations.
AsrequiredbyNUREG-0312, "InterimTechnical ReportonBWRFeedwater NozzleandControlRodDriveReturnLineNozzleCracking,"
aninservice UTanddyepenetrant (PT)examination ofthefourfeedwater nozzleswasperformed byGEduringthe1979refueling outage.Nosignificant changesfromthebaselineexaminations wereobserved.
Inaddition, theReactorWaterCleanup(RWCU)returnlinewasreroutedtothefeedwater lines.InNiagaraMohawk'sresponsetoNUREG-0619, datedDecember29,1980,wecommitted toaprogramofperiodicinspections ofthefeedwater andcontrolroddrivereturnlinenozzles.Thefeedwater nozzleUTinspection wastobeperformed everyotherrefueling outageandthevisualinspection (VT)ofthefeedwater spargerswastobeperformed everyfourthrefueling outage,commencing withthe1981outage.ThePTinspection ofthefeedwater andcontrolroddrivereturnlinenozzleswastobeperformed everysixthrefueling outageorevery90startup/shutdown cycles,whichever occurredfirst.ThePTInspection intervals commenced withthe1979refueling outage,duringwhichthebaselinefeedwater nozzlePTinspections weremade.
I NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXA1VHNATIONS 1995REFUELING OUTAGE(RFO-13)H.BACKROUNDCont'dDuringthe1988Refueling Outage(RFO-11),
theNMPCNuclearQualityAssurance Department generated Corrective ActionRequest88.2039-01 todocumentandresolvediscrepancies inpreviousoutages'eedwater nozzleexamination data.Alsogenerated duringthe1988outagewastheRestartActionPlan(RAP).OneoftheRAPspecificissuesaddressed thelackoffullvolumecoverageonfeedwater nozzlesasrequiredbyNUREG-0619.
Allofthecorrective actionsforbothoftheseissueswereidentified andimplemented duringthe1988outage.The1988UTexaminations ofthefeedwater nozzlesperformed bytheNuclearEnergyServicesCo.(NES)revealedindications thatwouldrequiremonitoring duringthefollowing refueling outage.TheUTexaminations conducted duringRFO-12in1993offeedwater nozzle"A"wereperformed byGeneralElectricNuclearEnergy(GE-NE).Theresultsoftheseexaminations werepresented inNMPC'ssubmittal ofAugust25,1993(NMP1L0777)whichindicated norecordable indications andresolvedthoseindications identified in1988duringRFO-11asrequiring additional monitoring.
Visualexaminations (VT)ofthefeedwater spargerflowholesandweldsinspargerarmsandteeswereperformed byGE-NEduringRFO-11in1988andagainduringRFO-12in1993,Theseexaminations indicated noreportable indications.
III.RULTSOFEXAMINATI NTheinspections conducted duringRFO-13in1995wereperformed withtheUltrasonic Test(UT)methodbyGE-NEwhichindicated noreportable indications.
TheseUTexaminations utilizedtheGERIS2000automated systemandmanualUTpickupsoftheRPVnozzlesonfour(4)feedwater andthecontrolroddrivereturnlinenozzles.Theresultsoftheseexaminations andasummaryofallpreviousexaminations arepresented inAppendixAofthisreport.IV.MODIFICATIONS NUREG-0619 requireslicensees toreportallmodifications orsystemchangesthataffectfeedwater flowortemperature andtoconsiderthesechangesinpredicting futurecrackingtendencies.
Sinceour1988outageNUREG-0019 report,therehavebeennomodifications orsystemchangesthataffectfeedwater flowortemperature.
AppendixBtothisreportsummarizes allapplicable physicalandprocedural modifications implemented atNineMilePointUnit1since1977whichaffectfeedwater flowortemperature.  


NMPIRPVFEEDWATERANDCRDRLNOZZLEEXAMINATIONS1995REFUELINGOUTAGE(RFO-13)V.TARTUP/HUTDWNCYCLThefeedwaterandcontrolroddrivereturnlinenozzleshaveexperienced171startup/shutdowncyclessinceinitialplantoperation.Thecontrolroddrivereturnlinenozzlehasexperiencedonly63startup/shutdowncyclessincethePTexaminationin1979.Table1providesfurtherdataonthenumberofstartup/shutdowncyclesfromoutagetooutagesince1977.VI.LEAKAGEMNITRINGNiagaraMohawkhasnotinstalledanon-linebypassleakagemonitoringsystematNineMilePointUnit1(NMP1).Thethermalsleevedesignincludesflowbafflesthatpreventmixingofthehotreactorwaterandthecolderfeedwaterinthenozzleannulus.NUREG-0619,Section4.3.2.4specificallyexemptsNMP1fromthisrequirement.VII.8UMMARYThenondestructiveexaminationsperformedduringthe1995RefuelingOutage,tu'0-13,identifiednoreportableindicationsthatwillrequiremonitoringinaccordancewithNUREG-0619.NMPCanticipatestocontinueutilizinganautomatedinspectionmethodsuchastheGEGERIS2000automatedsystemforfutureoutagesasdescribedinNMPC'ssubmittalofJune23,1994(NMP1L0829).
NMPIRPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)V.TARTUP/HUTDWNCYCLThefeedwater andcontrolroddrivereturnlinenozzleshaveexperienced 171startup/shutdown cyclessinceinitialplantoperation.
I NMP1RPVFEEDWATERANDCRDRLNOZZLEEXAMINATIONS1995REFUELINGOUTAGE(RFO-13)TABLEINUMBEROFSTARTUPHUTDWNCYCLATNINEMILEINTT1PERIODNUMBEROFCYCLESDURINGPERIODCUMULATIVE1969InitialStartup-1977RefuelingOutage1977RefuelingOutage-1979RefuelingOutage1979RefuelingOutage-1981RefuelingOutage1981RefuelingOutage-1983Safe-EndOutage1983Safe-EndOutage-1986RefuelingOutage1986RefuelingOutage-1987FeedwaterTransientOutage(1988RefuelingOutage)1988RefuelingOutageRFO-111993RefuelingOutageRFO-121993RefuelingOutageRFO-121995RefuelingOutageRFO-13951317141795108125127141149166171  
Thecontrolroddrivereturnlinenozzlehasexperienced only63startup/shutdown cyclessincethePTexamination in1979.Table1providesfurtherdataonthenumberofstartup/shutdown cyclesfromoutagetooutagesince1977.VI.LEAKAGEMNITRINGNiagaraMohawkhasnotinstalled anon-linebypassleakagemonitoring systematNineMilePointUnit1(NMP1).Thethermalsleevedesignincludesflowbafflesthatpreventmixingofthehotreactorwaterandthecolderfeedwater inthenozzleannulus.NUREG-0619, Section4.3.2.4specifically exemptsNMP1fromthisrequirement.
VII.8UMMARYThenondestructive examinations performed duringthe1995Refueling Outage,tu'0-13,identified noreportable indications thatwillrequiremonitoring inaccordance withNUREG-0619.
NMPCanticipates tocontinueutilizing anautomated inspection methodsuchastheGEGERIS2000automated systemforfutureoutagesasdescribed inNMPC'ssubmittal ofJune23,1994(NMP1L0829).
I NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)TABLEINUMBEROFSTARTUPHUTDWNCYCLATNINEMILEINTT1PERIODNUMBEROFCYCLESDURINGPERIODCUMULATIVE 1969InitialStartup-1977Refueling Outage1977Refueling Outage-1979Refueling Outage1979Refueling Outage-1981Refueling Outage1981Refueling Outage-1983Safe-EndOutage1983Safe-EndOutage-1986Refueling Outage1986Refueling Outage-1987Feedwater Transient Outage(1988Refueling Outage)1988Refueling OutageRFO-111993Refueling OutageRFO-121993Refueling OutageRFO-121995Refueling OutageRFO-13951317141795108125127141149166171  


VIII.R~RPERRNCNMP1RPVFEEDWATERANDCRDRLNOZZLEEXAMINATIONS1995REFUELINGOUTAGE(RFO-13)2.BWRFeedwaterNozzleandControlRodDriveReturnLineNozzleCracking,NUREG-0619,U.S.NuclearRegulatoryCommission,November1980.NMPCLetter,D.P.DisctoR.C.Haynes,U.S.NuclearRegulatoryCommission,datedJanuary4,1982(
VIII.R~RPERRNC NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)2.BWRFeedwater NozzleandControlRodDriveReturnLineNozzleCracking, NUREG-0619, U.S.NuclearRegulatory Commission, November1980.NMPCLetter,D.P.DisctoR.C.Haynes,U.S.NuclearRegulatory Commission, datedJanuary4,1982(


==Subject:==
==Subject:==
InserviceInspectionsofFeedwaterNozzlesandSpargersPerformedDuringthe1981RefuelingOutage).3.4,5.6.NESLetter,T.J.KochtoT.W.Roman,datedMarch4,1983(
 
Inservice Inspections ofFeedwater NozzlesandSpargersPerformed Duringthe1981Refueling Outage).3.4,5.6.NESLetter,T.J.KochtoT.W.Roman,datedMarch4,1983(


==Subject:==
==Subject:==
February,1983FeedwaterNozzleInnerRadiusExams).NESLetter,W.R.DownstoT.W.Roman,datedJune27,1984(
: February, 1983Feedwater NozzleInnerRadiusExams).NESLetter,W.R.DownstoT.W.Roman,datedJune27,1984(


==Subject:==
==Subject:==
April,1984FeedwaterNozzleInnerRadiusExams).NMPCsubmittaltotheNRC,datedDecember23,1986,letternumberNMP1L0119(
 
April,1984Feedwater NozzleInnerRadiusExams).NMPCsubmittal totheNRC,datedDecember23,1986,letternumberNMP1L0119(


==Subject:==
==Subject:==
1986RFO-10FeedwaterNozzleExaminationResults).NMPCsubmittaltotheNRC,datedMarch21,1989,letternumberNMP1L0374(
 
1986RFO-10Feedwater NozzleExamination Results).
NMPCsubmittal totheNRC,datedMarch21,1989,letternumberNMP1L0374(


==Subject:==
==Subject:==
1988RFO-11FeedwaterNozzleExamResults/NMPCPlansforFutureExaminationsandEvaluationofIdentifiedIndications).7.NRCLetter,datedMay1,1989,(TACNo.72944)(
 
1988RFO-11Feedwater NozzleExamResults/NMPC PlansforFutureExaminations andEvaluation ofIdentified Indications).
7.NRCLetter,datedMay1,1989,(TACNo.72944)(


==Subject:==
==Subject:==
SummaryofApril18,1989MeetingtoDiscussFeedwaterIndicationsatNMP1).8.9.10.12.NMPCsubmittaltotheNRC,datedMay5,1989,letternumberNMP1L0394(
 
SummaryofApril18,1989MeetingtoDiscussFeedwater Indications atNMP1).8.9.10.12.NMPCsubmittal totheNRC,datedMay5,1989,letternumberNMP1L0394(


==Subject:==
==Subject:==
FeedwaterNozzleIndicationFractureMechanicsAnalysis).NRCSafetyEvaluationofUltrasonicTestIndicationsintheFeedwaterInletNozzle"A"NearaNozzleSafeEnd(TAC72944),dated9/26/89.NMPCsubmittaltotheNRC,datedJanuary11,1991,letternumberNMP1L0560(
 
Feedwater NozzleIndication FractureMechanics Analysis).
NRCSafetyEvaluation ofUltrasonic TestIndications intheFeedwater InletNozzle"A"NearaNozzleSafeEnd(TAC72944),dated9/26/89.NMPCsubmittal totheNRC,datedJanuary11,1991,letternumberNMP1L0560(


==Subject:==
==Subject:==
1988RFO-11FeedwaterNozzleExaminationResults).NMPCInternalCorrespondencetoUnit1LicensingFilefromN,A,Spagnoletti,datedMarch1,1993,FileCode003631GG(
 
1988RFO-11Feedwater NozzleExamination Results).
NMPCInternalCorrespondence toUnit1Licensing FilefromN,A,Spagnoletti, datedMarch1,1993,FileCode003631GG(


==Subject:==
==Subject:==
NotesofTeleconwithNRCRegardingFeedwaterNozzle"A"UTInspection).NMPCsubmittaltotheNRC,datedAugust25,1993,letternumberNMP1L0777(
 
NotesofTeleconwithNRCRegarding Feedwater Nozzle"A"UTInspection).
NMPCsubmittal totheNRC,datedAugust25,1993,letternumberNMP1L0777(


==Subject:==
==Subject:==
1993RFO-12FeedwaterNozzle"A"ExaminationResults).
 
I NMP1RPVFEEDWATERANDCRDRLNOZZLEEXAMINATIONS1995REFUELINGOUTAGE(RFO-13)VIH.REFERENCCont'd13.NMPCNuclearEngineeringReportNo.NER-IM-006"NineMilePointUnit1FeedwaterNozzleFatigueEvaluation,"datedMay1994,(ReferenceMPR-1484,Revision0).14.NMPCNuclearEngineeringReportNo.NER-IM-007"NineMilePointUnit1ControlRodDriveReturnNozzleFatigueEvaluation,"datedMay1994,(ReferenceMPR-1485,Revision0).15.NMPCsubmittaltotheNRC,datedJune23,1994,letternumberNMP1L0829(
1993RFO-12Feedwater Nozzle"A"Examination Results).
I NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)VIH.REFERENCCont'd13.NMPCNuclearEngineering ReportNo.NER-IM-006 "NineMilePointUnit1Feedwater NozzleFatigueEvaluation,"
datedMay1994,(Reference MPR-1484,Revision0).14.NMPCNuclearEngineering ReportNo.NER-IM-007 "NineMilePointUnit1ControlRodDriveReturnNozzleFatigueEvaluation,"
datedMay1994,(Reference MPR-1485, Revision0).15.NMPCsubmittal totheNRC,datedJune23,1994,letternumberNMP1L0829(


==Subject:==
==Subject:==
AmendNUREG0619CommitmentfromPTtoAutomatedUTInspection).16.NRCLetter,datedJanuary12,1995,(TACNo.M89792)(
 
AmendNUREG0619Commitment fromPTtoAutomated UTInspection).
16.NRCLetter,datedJanuary12,1995,(TACNo.M89792)(


==Subject:==
==Subject:==
AmendNMPC'sNMP1NUREG0619CommitmentutilizingtheGERIS2000SystemfromAutomatedUTInspection).


IX.APPENDICESAPPENDIXAFEEDWATERNZZLEINSPECTIONRULTAsstatedinNiagaraMohawk'sletterofDecember29,1980,theNineMilePointUnit1Feedwaterandcontrolroddrivereturnlinenozzleswillbeperiodicallyreinspectedatthefollowingintervals:~FeedwaterNozzleUT-everyotherrefuelingoutage,commencingwiththe1981outage.~FeedwaterNozzleVT-everyfourthrefuelingoutage,commencingwiththe1981outage.~FeedwaterandCRDNozzlePT-everysixthrefuelingoutageorevery90startup/shutdowncycles,commencingwiththe1979refueling.Duringthe1981refuelingoutage(RFO-8),aninserviceUTexaminationofthefourfeedwaternozzleswasperformedbyNESandalsobyGE.Anapparentchangefromthebaselineexaminationwasobserved.Furtherevaluationrequiredremovalofthespargerfromthesoutheastnozzle.Basedontheresultsoftheadditionalnondestructiveexaminations,NiagaraMohawkconcludedthattheUTindicationwascausedbyageometricreflectorandnotbyacrackinthenozzle.Anewfeedwaterspargerwasinstalledinthesoutheastnozzle.Thedesignofthenewspargerwasthesameasthereplacementspargersinstalledduringthe1977refuelingoutage.Duringthe1983safe-endoutage,inserviceinspectionsofthefeedwaternozzleswerenotrequiredbyNUREG-0619schedulecommitment.However,thenozzleswereexaminedbyNESforinformationonly.Anincreaseintheamplitudeofthesignalfromthegeometricreflectorinthesoutheastnozzlewasnoted.Amorerigorousevaluationofthisindicationwasperformedduringthe1984refuelingoutageclearlyidentifyinganddocumentingthatthisreflectorisgeometricandhasexhibitednogrowthorchange.Duringthe1986refuelingoutage(RFO-10),inserviceUTexaminationsofthefourfeedwaternozzleswereperformedbyNES.Nosignificantchangesfromthepreviousexaminationswereidentified.Duringthe1988refuelingoutage(RFO-11),inserviceUTexaminationsofthefourfeedwaternozzleswereperformedbyNES.Theseexaminationsidentifiedapproximately25indicationsinthevicinityofthenozzletosafe-endweldofthenortheastnozzle"A"at45degrees.Althoughtheseindicationsmighthavebeencausedbyscratchmarksmadeduringspargerinstallation,weconservativelyevaluatedthemascracks.NUREG0619,Section4.3.2.3states,"ifrecordableindicationsareinterpretedtobecracksinanynozzle,proceedwithspargerremoval,Fl'fthenozzleboreandnozzleblendradius,andrepair."Eighteenofthetwenty-fiveindicationswereobservedat20to25%ofthedistanceamplitudecorrection e,
AmendNMPC'sNMP1NUREG0619Commitment utilizing theGERIS2000SystemfromAutomated UTInspection).
APPENDIXAFEEDWATERNZZLEINPETINRULTCnt'dcurve(DAC).However,theapplicableASMECoderecordingcriteriais50%DAC.Therefore,theseindicationswerenot"recordable"anddidnotrequirefurtherevaluation.Theremainingindicationsappearedtobetwoseparateflaws,onelocatedinthenozzleandonelocatedinthesafeendweld.Theindicationsappearedatapproximately50%DAC.TheflawswereaxiallyorientedandtheirsizewellwithintheASMESectionXIacceptancecriteria(a/t-4.7%and7%versusallowableof11.02%and11.23%).Theexaminationwasperformedusinga45degreeshearwavetransducercalibratedonanozzlemock-upwitha5%T-notchreflector.TheCodepermitscalibrationonnotchesupto10%T(Tisthenominalthicknessofthecalibrationblock).Consequently,theexaminationsensitivityexceedstheCoderequiredsensitivity.Ifa10%Tnotchhadbeenused,theseindicationsmaynothavebeenrecordableperASMESectionXI.ConsideringthattheexaminationwasperformedatahighersensitivitythanrequiredbyCode,thattheindicationsareatthethresholdoftherecordingcriteria,andthattheindicationswillremainwithinallowablesizeforatleastthenexttwooperatingcycles,NiagaraMohawkdeterminedthatfurtherevaluationoftheseindicationswasnotrequired.Afracturemechanicsevaluationofthesetwoflawswasperformed.Theresultsoftheanalysispredictedgrowthoftheflawsnottoexceed0,001inchesovera40-yearperiod.Therefore,theconclusionwasmadethattheflawswerenotsignificantandshouldnotaffectcontinuedplantoperation.Additionally,NiagaraMohawkcommittedtoexaminefeedwaternozzle"A"duringthenextrefuelingoutage(1993).Duringthe1993refuelingoutage(RFO-12),inserviceUTexaminationsoffeedwaternozzle"A"(N4A)Zones1,2,3,and4wereperformedbyGeneralElectricNuclearEnergy(GE-NE).Notetheindicationsidentifiedin1988(RFO-12)werecontainedinZone4ofN4A.Thesameultrasonictechniqueswereemployedasusedduringthe1988refuelingoutage(RFO-11)examinations,otherthan,thecalibrationstandardwasmodifiedtoincludeCodeallowable10%notchesaswellasthepreviouslyused5%notches.Theexaminationsindicatednoreportableindications.TheZone4indicationsdetectedinthe1988outagewereseenbutnotatrecordablelevelsbasedoneitherthe5%or10%notchcalibrations.ElectricPowerResearchInstitute(EPRI)sizingtechniqueswerethenattemptedtoseeifanadequatethrough-walldimensioncouldbeattainedonthepreviouslyrecordedindications.Althoughabasesignalcouldbeseen,notipsignalswerenotedwitheithertheRelativeArrivalTimetechniqueortheAbsoluteArrivalTimetechnique.Sincenotipcouldberesolved,thesourceofthesereflectorswasdeterminedtobefromscratchesorinsidediameter(ID)surfaceirregularitiesandnotfromIDcracking.TheseinserviceinspectionresultshavebeenreviewedandapprovedbyaNiagaraMohawkLevelIIIexaminer.  
 
IX.APPENDICES APPENDIXAFEEDWATER NZZLEINSPECTION RULTAsstatedinNiagaraMohawk'sletterofDecember29,1980,theNineMilePointUnit1Feedwater andcontrolroddrivereturnlinenozzleswillbeperiodically reinspected atthefollowing intervals:
~Feedwater NozzleUT-everyotherrefueling outage,commencing withthe1981outage.~Feedwater NozzleVT-everyfourthrefueling outage,commencing withthe1981outage.~Feedwater andCRDNozzlePT-everysixthrefueling outageorevery90startup/shutdown cycles,commencing withthe1979refueling.
Duringthe1981refueling outage(RFO-8),aninservice UTexamination ofthefourfeedwater nozzleswasperformed byNESandalsobyGE.Anapparentchangefromthebaselineexamination wasobserved.
Furtherevaluation requiredremovalofthespargerfromthesoutheast nozzle.Basedontheresultsoftheadditional nondestructive examinations, NiagaraMohawkconcluded thattheUTindication wascausedbyageometric reflector andnotbyacrackinthenozzle.Anewfeedwater spargerwasinstalled inthesoutheast nozzle.Thedesignofthenewspargerwasthesameasthereplacement spargersinstalled duringthe1977refueling outage.Duringthe1983safe-endoutage,inservice inspections ofthefeedwater nozzleswerenotrequiredbyNUREG-0619 schedulecommitment.
However,thenozzleswereexaminedbyNESforinformation only.Anincreaseintheamplitude ofthesignalfromthegeometric reflector inthesoutheast nozzlewasnoted.Amorerigorousevaluation ofthisindication wasperformed duringthe1984refueling outageclearlyidentifying anddocumenting thatthisreflector isgeometric andhasexhibited nogrowthorchange.Duringthe1986refueling outage(RFO-10),
inservice UTexaminations ofthefourfeedwater nozzleswereperformed byNES.Nosignificant changesfromthepreviousexaminations wereidentified.
Duringthe1988refueling outage(RFO-11),
inservice UTexaminations ofthefourfeedwater nozzleswereperformed byNES.Theseexaminations identified approximately 25indications inthevicinityofthenozzletosafe-endweldofthenortheast nozzle"A"at45degrees.Althoughtheseindications mighthavebeencausedbyscratchmarksmadeduringspargerinstallation, weconservatively evaluated themascracks.NUREG0619,Section4.3.2.3states,"ifrecordable indications areinterpreted tobecracksinanynozzle,proceedwithspargerremoval,Fl'fthenozzleboreandnozzleblendradius,andrepair."Eighteenofthetwenty-five indications wereobservedat20to25%ofthedistanceamplitude correction e,
APPENDIXAFEEDWATER NZZLEINPETINRULTCnt'dcurve(DAC).However,theapplicable ASMECoderecording criteriais50%DAC.Therefore, theseindications werenot"recordable" anddidnotrequirefurtherevaluation.
Theremaining indications appearedtobetwoseparateflaws,onelocatedinthenozzleandonelocatedinthesafeendweld.Theindications appearedatapproximately 50%DAC.TheflawswereaxiallyorientedandtheirsizewellwithintheASMESectionXIacceptance criteria(a/t-4.7%
and7%versusallowable of11.02%and11.23%).Theexamination wasperformed usinga45degreeshearwavetransducer calibrated onanozzlemock-upwitha5%T-notchreflector.
TheCodepermitscalibration onnotchesupto10%T(Tisthenominalthickness ofthecalibration block).Consequently, theexamination sensitivity exceedstheCoderequiredsensitivity.
Ifa10%Tnotchhadbeenused,theseindications maynothavebeenrecordable perASMESectionXI.Considering thattheexamination wasperformed atahighersensitivity thanrequiredbyCode,thattheindications areatthethreshold oftherecording
: criteria, andthattheindications willremainwithinallowable sizeforatleastthenexttwooperating cycles,NiagaraMohawkdetermined thatfurtherevaluation oftheseindications wasnotrequired.
Afracturemechanics evaluation ofthesetwoflawswasperformed.
Theresultsoftheanalysispredicted growthoftheflawsnottoexceed0,001inchesovera40-yearperiod.Therefore, theconclusion wasmadethattheflawswerenotsignificant andshouldnotaffectcontinued plantoperation.
Additionally, NiagaraMohawkcommitted toexaminefeedwater nozzle"A"duringthenextrefueling outage(1993).Duringthe1993refueling outage(RFO-12),
inservice UTexaminations offeedwater nozzle"A"(N4A)Zones1,2,3,and4wereperformed byGeneralElectricNuclearEnergy(GE-NE).Notetheindications identified in1988(RFO-12)werecontained inZone4ofN4A.Thesameultrasonic techniques wereemployedasusedduringthe1988refueling outage(RFO-11)examinations, otherthan,thecalibration standardwasmodifiedtoincludeCodeallowable 10%notchesaswellasthepreviously used5%notches.Theexaminations indicated noreportable indications.
TheZone4indications detectedinthe1988outagewereseenbutnotatrecordable levelsbasedoneitherthe5%or10%notchcalibrations.
ElectricPowerResearchInstitute (EPRI)sizingtechniques werethenattempted toseeifanadequatethrough-wall dimension couldbeattainedonthepreviously recordedindications.
Althoughabasesignalcouldbeseen,notipsignalswerenotedwitheithertheRelativeArrivalTimetechnique ortheAbsoluteArrivalTimetechnique.
Sincenotipcouldberesolved, thesourceofthesereflectors wasdetermined tobefromscratches orinsidediameter(ID)surfaceirregularities andnotfromIDcracking.
Theseinservice inspection resultshavebeenreviewedandapprovedbyaNiagaraMohawkLevelIIIexaminer.  


APPENDIXAFEEDWATERNOZZLEINPECTINRULTSCont'dByletterdatedJune23,1994(NMP1L0820),NMPCinformedtheCommission,andprovidedtechnicalbasisfor,utilizationoftheGEGERIS2000automatedsystem(UT)forfutureexaminationsinlieuofperformingaPT.ThisamendedourpriorNUREG0619commitment.InaletterdatedJanuary12,1995,theNRCdeterminedthatitwasacceptableforNMPCtoproceedwiththedescribedcommitmentchangesandthatNMPCwouldbeadvisedofthefinalresultsoftheNRCreview.Duringthe1995refuelingoutage(RFO-13),inserviceexaminationswereperformedonfour(4)feedwaterandthecontrolroddrivereturnlinenozzles.TheUltrasonicTest(UT)examinationswereperformedbyGE-NEandindicatednoreportableindicationswererecorded.TheseUTexaminationsutilizedtheGERIS2000automatedsystemandmanualUTpickups.AlloftheseexaminationresultshavebeenreviewedandapprovedbyaNiagaraMohawkLevelIIIexaminer,  
APPENDIXAFEEDWATER NOZZLEINPECTINRULTSCont'dByletterdatedJune23,1994(NMP1L0820),NMPCinformedtheCommission, andprovidedtechnical basisfor,utilization oftheGEGERIS2000automated system(UT)forfutureexaminations inlieuofperforming aPT.ThisamendedourpriorNUREG0619commitment.
InaletterdatedJanuary12,1995,theNRCdetermined thatitwasacceptable forNMPCtoproceedwiththedescribed commitment changesandthatNMPCwouldbeadvisedofthefinalresultsoftheNRCreview.Duringthe1995refueling outage(RFO-13),
inservice examinations wereperformed onfour(4)feedwater andthecontrolroddrivereturnlinenozzles.TheUltrasonic Test(UT)examinations wereperformed byGE-NEandindicated noreportable indications wererecorded.
TheseUTexaminations utilizedtheGERIS2000automated systemandmanualUTpickups.Alloftheseexamination resultshavebeenreviewedandapprovedbyaNiagaraMohawkLevelIIIexaminer,  


APPENDIXAFEEDWATERNOZZLEINSPECTIONRESULTSN4ANOZZLE45DEGREENORTHEASTRESULTS19771NRI1979NRINRI1981GEOMETRICREFLECTORSWELDREPAIREDCRACKINBRACKETPIN1983*GEOMETRICREFLECTORS1984~GEOMETRICREFLECTORSGEOMETRICREFLECTORSRESULTSGEOMETRIC&NON-GEOMETRICREFLECTORS1993FO-12NRINRI1995FO-13NRIAMENDEDMETHODPERFORMEDUTNOTES:NOTREQUIREDBYNUREG-0619.PERFORMEDFORINFORMATIONONLY.THE1983SAFE-ENDREPLACEMENTOUTAGEISNOTCONSIDEREDAREFUELINGOUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(I)NOREPORTABLEINDICATIONULTRASONICTESTINGDYEPENETRANTTESTINGVISUALTESTINGNOREPORTABLEINDICATIONSEITHERBEFOREORAFTERSPARGERREPLACEMENT10
APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4ANOZZLE45DEGREENORTHEAST RESULTS19771NRI1979NRINRI1981GEOMETRIC REFLECTORS WELDREPAIREDCRACKINBRACKETPIN1983*GEOMETRIC REFLECTORS 1984~GEOMETRIC REFLECTORS GEOMETRIC REFLECTORS RESULTSGEOMETRIC
&NON-GEOMETRIC REFLECTORS 1993FO-12NRINRI1995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG-0619.
PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(I)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS EITHERBEFOREORAFTERSPARGERREPLACEMENT 10


APPENDIXAFEEDWATERNOZZLEINSPECTIONRESULTSN4BNOZZLE135DEGREOUTHEASTRESULTS1977119791981219831984~UTVTNRINRINRI1-1/2"LONGX314"5-1I2"LONGX0.8"DISPOSITIONEDGEOMETRICDEEPGEOMETRICDEEPAMPLITUDEASGEOMETRICREFLECTORSINCREASEOF309o8INDICATIONSDISPOSITIONEDASMINORSURFACEIRREGULARITIESNRIRESULTSVT1988FO-11GEOMETRICREFLECTORS1993FO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMEDUTOTES:NOTREQUIREDBYNUREG4619.PERFORMEDFORINFORMATIONONLY.THE1983SAFE-ENDREPLACEMENTOUTAGEISNOTCONSIDEREDAREFUELINGOUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(1)(2)NOREPORTABLEINDICATIONULTRASONICTESTINGDYEPENETRANTTESTINGVISUALTESTINGNOREPORTABLEINDICATIONSEITHERBEFOREORAFTERSPARGERREPLACEMENTSPARGERPULLEDFOREVALUATIONOFINDICATIONS.NEWSPARGERINSTALLED.11  
APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4BNOZZLE135DEGREOUTHEASTRESULTS1977119791981219831984~UTVTNRINRINRI1-1/2"LONGX314"5-1I2"LONGX0.8"DISPOSITIONED GEOMETRIC DEEPGEOMETRIC DEEPAMPLITUDE ASGEOMETRIC REFLECTORS INCREASEOF309o8INDICATIONS DISPOSITIONED ASMINORSURFACEIRREGULARITIES NRIRESULTSVT1988FO-11GEOMETRIC REFLECTORS 1993FO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMED UTOTES:NOTREQUIREDBYNUREG4619.
PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(1)(2)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS EITHERBEFOREORAFTERSPARGERREPLACEMENT SPARGERPULLEDFOREVALUATION OFINDICATIONS.
NEWSPARGERINSTALLED.
11  


APPENDIXAFEEDWATERNOZZLEINSPECTIONRESULTSN4CNOZZLE225DEGREESSOUTHWESTRESULTS19771NRINRI1979NRINRI1981GEOMETRICREFLECTORSNRI19834GEOMETRICREFLECTORS19844ACCEPTABLEINCLUSION1986FO-10GEOMETRICREFLECTORSUTGEOMETRICREFLECTORS&ACCEPTABLENON-GEOMETRICREFLECTORS1993RFO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMEDUTNOTES:NOTREQUIREDBYNUREG-0619.PERFORMEDFORINFORMATIONONLY.THE1983SAFE-ENDREPLACEMENTOUTAGEISNOTCONSIDEREDAREFUELINGOUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(I)NOREPORTABLEINDICATIONULTRASONICTESTINGDYEPENETRANTTESTINGVISUALTESTINGNOREPORTABLEINDICATIONSAFTERCOMPLETIONOFREPAIRACTIVITIESANDREPLACEMENTOFSPARGER.12 I
APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4CNOZZLE225DEGREESSOUTHWEST RESULTS19771NRINRI1979NRINRI1981GEOMETRIC REFLECTORS NRI19834GEOMETRIC REFLECTORS 19844ACCEPTABLE INCLUSION 1986FO-10GEOMETRIC REFLECTORS UTGEOMETRIC REFLECTORS
APPENDIXAFEEDWATERNOZZLEINSPECTIONRESULTSN4DNOZZLE315DEGREESNORTHWEST~~RESULTSPT19771NRINRINRI1979NRI1981GEOMETRICREFLECI'ORSNRI1983*TWOINDICATIONSNOTGEOMETRIC25%FSH1984+NRI1986FO-10GEOMETRICREFLECTORSRESULTSUTVT1988RFO-11GEOMETRICREFLECTORSNRI1993FO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMEDUTNOTES:NOTREQUIREDBYNUREG4619.PERFORMEDFORINFORMATIONONLY.THE1983SAFE-ENDREPLACEMENTOUTAGEISNOTCONSIDEREDAREFUELINGOUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(1)NOREPORTABLEINDICATIONULTRASONICTESTINGDYEPENETRANTTESTINGVISUALTESTINGNOREPORTABLEINDICATIONSAFTERCOMPLETIONOFREPAIRACTIVITIESANDREPLACEMENTOFSPARGER.13  
&ACCEPTABLE NON-GEOMETRIC REFLECTORS 1993RFO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG-0619.
PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(I)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS AFTERCOMPLETION OFREPAIRACTIVITIES ANDREPLACEMENT OFSPARGER.12 I
APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4DNOZZLE315DEGREESNORTHWEST
~~RESULTSPT19771NRINRINRI1979NRI1981GEOMETRIC REFLECI'ORSNRI1983*TWOINDICATIONS NOTGEOMETRIC 25%FSH1984+NRI1986FO-10GEOMETRIC REFLECTORS RESULTSUTVT1988RFO-11GEOMETRIC REFLECTORS NRI1993FO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG4619.
PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(1)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS AFTERCOMPLETION OFREPAIRACTIVITIES ANDREPLACEMENT OFSPARGER.13  


APPENDIXACONTROLRODDRIVERETURNLINENOZZLEINSPECTIONRTN9NOZZLE44.1-WD417/01S-IRRESULTS19771197919811983~19848'986FO-10NRIRESULTS1988FO-111993RFO-121995FO-13NRIAMENDEDMETHODPERFORMEDUTNOTES:NOTREQUIREDBYNUREG-0619.PERFORMEDFORINFORMATIONONLY.THE1983SAFE-ENDREPLACEMENTOUTAGEISNOTCONSIDEREDAREFUELINGOUTAGEBYNIAGARAMOHAWK.NRIUTPTVT0)NOREPORTABLEINDICATIONULTRASONICTESTINGDYEPENETRANTTESTINGVISUALTESTINGNOREPORTABLEINDICATIONSEITHERBEFOREORAFTERSPARGERREPLACEMENT14
APPENDIXACONTROLRODDRIVERETURNLINENOZZLEINSPECTION RTN9NOZZLE44.1-WD417/01S-IR RESULTS19771197919811983~19848'986 FO-10NRIRESULTS1988FO-111993RFO-121995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG-0619.
PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT0)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS EITHERBEFOREORAFTERSPARGERREPLACEMENT 14


~~4APP~~IX3MODIFICATIONORSYSTEMCHANGESAFFECTFEEDATERFLWORTEMPERAE1997.Feedwaternozzlecladdingremovedandspargersreplacedwithimproveddesign.~179ReactorWaterCleanupreturnlinereroutedtothefeedwaterlineinaccordancewithSection4.2ofNUREG-0619.1981ReplacedsoutheastspargerafterevaluationofUTindications.1983Thefeedwaterlowflowcontrolvalveswerereplacedwithnewvalvesdesignedtoimprovecontrolatlowflowconditions.Inaddition,asix-inchrecirculationlinewasinstalledtoprovideimprovedflowcontrolofthefeedwatersystem.Thesemodificationswerepreviouslydescribedinourletterdated9/8/81.19914InresponsetoNUREG0737,ActionItemII.D.1,instrumentandcontrolequipmentwereinstalledtoprovideahighreactorleveltripofthemotor-drivenfeedwaterpumps.Inaddition,theHPCIcontrolsystemwasmodifiedtoaddannunciatoralarmsforlossofHPCIfailuresignalinstandbymode.1998iThefollowingchangesweremadetoimprovethereliabilityofthefeedwatersystem:1.Modifiedhighleveltripcircuitsealinlogic.2.Modifiedmainflowvalvelockupcircuitstowithstandmomentarypowerinterruptions.3.Modifiedlogictoclose6-inchrecirculationvalveonpumpstartsignalforrunoutprotection.4.ModifiedlogictocloselowflowcontrolvalvesonHPCIinitiation.199Noadditionalmodificationsorsystemchangesthataffectfeedwaterflowortemperature.~193Turbinedrivenfeedwaterpumpflowcontrolvalveswerereplacedbyasingleflowcontrolvalve;thischangehadnoaffectonfeedwaterflowortemperature.~195Noadditionalmodificationsorsystemchangesthataffectfeedwaterflowortemperature.15  
~~4APP~~IX3MODIFICATION ORSYSTEMCHANGESAFFECTFEEDATERFLWORTEMPERAE1997.Feedwater nozzlecladdingremovedandspargersreplacedwithimproveddesign.~179ReactorWaterCleanupreturnlinereroutedtothefeedwater lineinaccordance withSection4.2ofNUREG-0619.
1981Replacedsoutheast spargerafterevaluation ofUTindications.
1983Thefeedwater lowflowcontrolvalveswerereplacedwithnewvalvesdesignedtoimprovecontrolatlowflowconditions.
Inaddition, asix-inchrecirculation linewasinstalled toprovideimprovedflowcontrolofthefeedwater system.Thesemodifications werepreviously described inourletterdated9/8/81.19914InresponsetoNUREG0737,ActionItemII.D.1,instrument andcontrolequipment wereinstalled toprovideahighreactorleveltripofthemotor-driven feedwater pumps.Inaddition, theHPCIcontrolsystemwasmodifiedtoaddannunciator alarmsforlossofHPCIfailuresignalinstandbymode.1998iThefollowing changesweremadetoimprovethereliability ofthefeedwater system:1.Modifiedhighleveltripcircuitsealinlogic.2.Modifiedmainflowvalvelockupcircuitstowithstand momentary powerinterruptions.
3.Modifiedlogictoclose6-inchrecirculation valveonpumpstartsignalforrunoutprotection.
4.ModifiedlogictocloselowflowcontrolvalvesonHPCIinitiation.
199Noadditional modifications orsystemchangesthataffectfeedwater flowortemperature.
~193Turbinedrivenfeedwater pumpflowcontrolvalveswerereplacedbyasingleflowcontrolvalve;thischangehadnoaffectonfeedwater flowortemperature.
~195Noadditional modifications orsystemchangesthataffectfeedwater flowortemperature.
15  


APPENDIXCDESCRIPTIONOFTRANIEXAMINATINPRCEDA.IIXILPPWM~TheNESfeedwaternozzleUTexaminationprocedurewasfirstusedatNineMilePointUnit1in1981.Thisproceduredividedthenozzleinnerradiusandboresurfacesintotwozones,NESZone1examinationsareperformedfromthereactorvesselshell;NESZone2examinationsareperformedfromthenozzlebarrel.NESZone1andZone2examinationsoverlapattheinsideradiussurfaceofthenozzle.Examinationsperformedfromthereactorvesselshellareperformedbyattachingaspeciallydesignedlucitewedge,whichconformstothereactorvesseloutsideradius,toanultrasonictransducersuchthatthelongitudinalbeamangleisfixed.Examinationsperformedfromthenozzlebarrelareperformedusingcompoundanglebeamshearwavetechniques.Inthiscase,anumberofspeciallydesignedfixedcompoundanglelucitewedgeswhichconformtotheoutsideradiusofthenozzlebarrelareused.In1988,additionalscansandscanningangleswereusedonthesafe-endbore,nozzlebore,andtheinnerradiustoensureoptimalinterrogationoftherequiredvolumes.Recordingcriteriawasupdatedformoreuniformitywhencomparingdatafromeachoutage.Anewtemplatewasdesignedandbuilttofacilitateshell-sideexams.B.~GEPC.URBTheGEfeedwaternozzleUTexaminationprocedurewasusedforthe1977baselineandthe1979inserviceinspectionsatNineMilePointUnit1.Thisproceduredividesthenozzleinnerradiusandboresurfacesintothreezones.TheGEZone1examinationisperformedbyattachinganultrasonictransducertoaspeciallydesignedlucitewedge,whichconformstothereactorvesseloutsideradius,suchthatthelongitudinalbeamangleandthecircumferentialbeamanglearefixed.TheGEZone2examinationisperformedbyattachinganultrasonictransducertoaspeciallydesignedlucitewedge,whichconformstotheouterdiameterblendradiusofthenozzle,suchthatthelongitudinalbeamangleandthecircumferentialbeamanglearefixed.TheGEZone3examinationisperformedbyattachinganultrasonictransducertoaspeciallydesignedlucitewedge,whichconformstotheoutsideradiusofthenozzlebarrel,suchthatthecircumferentialbeamangleisfixed.16  
APPENDIXCDESCRIPTION OFTRANIEXAMINATI NPRCEDA.IIXILPPWM~TheNESfeedwater nozzleUTexamination procedure wasfirstusedatNineMilePointUnit1in1981.Thisprocedure dividedthenozzleinnerradiusandboresurfacesintotwozones,NESZone1examinations areperformed fromthereactorvesselshell;NESZone2examinations areperformed fromthenozzlebarrel.NESZone1andZone2examinations overlapattheinsideradiussurfaceofthenozzle.Examinations performed fromthereactorvesselshellareperformed byattaching aspecially designedlucitewedge,whichconformstothereactorvesseloutsideradius,toanultrasonic transducer suchthatthelongitudinal beamangleisfixed.Examinations performed fromthenozzlebarrelareperformed usingcompoundanglebeamshearwavetechniques.
Inthiscase,anumberofspecially designedfixedcompoundanglelucitewedgeswhichconformtotheoutsideradiusofthenozzlebarrelareused.In1988,additional scansandscanningangleswereusedonthesafe-endbore,nozzlebore,andtheinnerradiustoensureoptimalinterrogation oftherequiredvolumes.Recording criteriawasupdatedformoreuniformity whencomparing datafromeachoutage.Anewtemplatewasdesignedandbuilttofacilitate shell-side exams.B.~GEPC.URBTheGEfeedwater nozzleUTexamination procedure wasusedforthe1977baselineandthe1979inservice inspections atNineMilePointUnit1.Thisprocedure dividesthenozzleinnerradiusandboresurfacesintothreezones.TheGEZone1examination isperformed byattaching anultrasonic transducer toaspecially designedlucitewedge,whichconformstothereactorvesseloutsideradius,suchthatthelongitudinal beamangleandthecircumferential beamanglearefixed.TheGEZone2examination isperformed byattaching anultrasonic transducer toaspecially designedlucitewedge,whichconformstotheouterdiameterblendradiusofthenozzle,suchthatthelongitudinal beamangleandthecircumferential beamanglearefixed.TheGEZone3examination isperformed byattaching anultrasonic transducer toaspecially designedlucitewedge,whichconformstotheoutsideradiusofthenozzlebarrel,suchthatthecircumferential beamangleisfixed.16  


tAPPENDIXCDESCRIPTIONOFULTRANICEXAMINATIONPROCEDURC.NMPCPROCEDURENiagaraMohawkNDEProcedure(No.NDEP-UT-6.07)wasusedtoUTexaminefeedwaternozzle"A"(N4A)Zones1,2,3,and4duringthe1993refuelingoutage(RFO-12).ThisprocedureutilizedmanualtechniquesandequipmentwhicharesimilarandequivalenttothoseusedbyNESduringthe1988refuelingoutage(RFO-11).TheultrasonictechniquesemployedarethesameasthoseusedfortheRFO-11examinations,otherthan,thecalibrationstandardwasmodifiedtoincludeCodeallowable10%notchesaswellasthepreviouslyused5%notchesforthesafe-endboreexamination.TheseexaminationswereperformedbyGeneralElectricNuclearEnergy(GE-NE)personnel.D.DESCRIPTIONOFGE-NEGERIS-2000AUTOMATEDVTINSPECTINYTEMF-13TheGERIS-2000UTImagingSystemisanautomatedultrasonicdataacquisitionandimagingsystem.AutomatedscannersinterfacedtotheGERIS-2000,movedUTtransducersradiallyandcircumferentiallyaroundtheoutsidesurfaceofthenozzleandadjacentsurfacesofthesafe-endandreactorpressurevessel.UTdatawascollectedandstoredindigitalformat.ThecompleteRFwaveformwasdigitizedandrecordedonopticaldisksforanalysis,TheGERIS-2000UTsubsystemisamultiplexedlogarithmicUTflawdetectioninstrument.Foreachchannel,thecompleteRFA-scanwasdigitizedandstoredonopticaldisks.ThesystemstorestheRFsignalinlogarithmicformatthathasaninstantaneousdynamicrangethatisgreaterthan85dB.ThelogarithmicUTsystemallowstherecordingofthepeaksoflowandhighamplitudeUTsignalsatthesametimewithoutclippingUTsignals,suchaswouldoccurwithlinearsystemsthathaveaninstantaneousdynamicrangegenerallylessthan45dB.TheanalysisoftheGERIS-2000datautilizedadvancedinteractivecolorgraphicstoevaluateandassistincharacterizingindicationsfromservice,fabricationandgeometricrelatedUTreflectors.CoordinatedA-,B-,C-,volumetricside-view-,volumetricend-view-,and3D-scansareprovidedonahighresolution(1280by1024pixels)colordisplay.Severalchannelsmaybedisplayedatonetimetocorrelateindicationsfromdifferentchannels.Thesegraphicdisplayshaveanadjustablecolorscalethatprovidesthebestresolutionofflawdetectionandcharacterizationdowntothematerialnoise.NMPCsubmittalofJune23,1994tReference¹13]includedEnclosure1,SectionII,"UltrasonicInspectionTechniques",whichprovidedadescriptionoftheGERISUTtechniques,UTinstrumentationandscanningequipmentindetail.17  
tAPPENDIXCDESCRIPTION OFULTRANICEXAMINATION PROCEDURC.NMPCPROCEDURE NiagaraMohawkNDEProcedure (No.NDEP-UT-6.07) wasusedtoUTexaminefeedwater nozzle"A"(N4A)Zones1,2,3,and4duringthe1993refueling outage(RFO-12).
Thisprocedure utilizedmanualtechniques andequipment whicharesimilarandequivalent tothoseusedbyNESduringthe1988refueling outage(RFO-11).Theultrasonic techniques employedarethesameasthoseusedfortheRFO-11examinations, otherthan,thecalibration standardwasmodifiedtoincludeCodeallowable 10%notchesaswellasthepreviously used5%notchesforthesafe-endboreexamination.
Theseexaminations wereperformed byGeneralElectricNuclearEnergy(GE-NE)personnel.
D.DESCRIPTION OFGE-NEGERIS-2000 AUTOMATED VTINSPECTINYTEMF-13TheGERIS-2000 UTImagingSystemisanautomated ultrasonic dataacquisition andimagingsystem.Automated scannersinterfaced totheGERIS-2000, movedUTtransducers radiallyandcircumferentially aroundtheoutsidesurfaceofthenozzleandadjacentsurfacesofthesafe-endandreactorpressurevessel.UTdatawascollected andstoredindigitalformat.ThecompleteRFwaveformwasdigitized andrecordedonopticaldisksforanalysis, TheGERIS-2000 UTsubsystem isamultiplexed logarithmic UTflawdetection instrument.
Foreachchannel,thecompleteRFA-scanwasdigitized andstoredonopticaldisks.ThesystemstorestheRFsignalinlogarithmic formatthathasaninstantaneous dynamicrangethatisgreaterthan85dB.Thelogarithmic UTsystemallowstherecording ofthepeaksoflowandhighamplitude UTsignalsatthesametimewithoutclippingUTsignals,suchaswouldoccurwithlinearsystemsthathaveaninstantaneous dynamicrangegenerally lessthan45dB.TheanalysisoftheGERIS-2000 datautilizedadvancedinteractive colorgraphicstoevaluateandassistincharacterizing indications fromservice,fabrication andgeometric relatedUTreflectors.
Coordinated A-,B-,C-,volumetric side-view-,
volumetric end-view-,
and3D-scansareprovidedonahighresolution (1280by1024pixels)colordisplay.Severalchannelsmaybedisplayed atonetimetocorrelate indications fromdifferent channels.
Thesegraphicdisplayshaveanadjustable colorscalethatprovidesthebestresolution offlawdetection andcharacterization downtothematerialnoise.NMPCsubmittal ofJune23,1994tReference
¹13]includedEnclosure 1,SectionII,"Ultrasonic Inspection Techniques",
whichprovidedadescription oftheGERISUTtechniques, UTinstrumentation andscanningequipment indetail.17  


tAPPENDIXCDESCRIPTIONOFULTRANICEXAMINATINPROCEDURESCont'dD.DCRIPTIONFE-NEGERT-2000AUTMATEDVTINPECTIONSYSTEMCont'dAmplitude-basedrecordingandreportingcriteriaisnotusedwiththeGERIS-2000fornozzleinnerradiusandboreexaminations.AllUTdataisrecordedandevaluated.AnyUTdatathathassignal-to-noiseratiosofgreaterthan2-to-l,hasecho-dynamiccharacteristicsofcrackingandcanbeconfirmedfrom2directionsoraccompaniedbytip-diffractedsignalsarecalledcracks.TheGERIS-2000systemiscapableofdetectingandsizingaxialflaws0.250inchesorlessindepthinfeedwaternozzleinnerradiusandboreregions.ThecapabilityoftheGERIS-2000systemfordefectdetectionandsizingwasdemonstratedandincludedinNMPCsubmittalJune23,1994[Reference¹13]inEnclosure1,SectionIII,"UltrasonicTechniqueQualificationPlan",whichprovidedadetaileddescriptionoftheEDMnotchesandfatigue-crackimplantsthatareusedtodemonstratethecapabilityoftheGERIS-2000system.Whenobstructionslimitedautomatedscanningcoverage,supplementalmanualexaminationswereperformed.Inbothcases,fullIDcoveragewasobtainedfromatleastonedirection.Whenautomatedscanningcannotbeperformedfrombothdirections,manualtechniquesutilizingthesametechniquesastheautomatedexaminationswereused.TheentireIDsurfaceofzones1through5(seeFigure1below)wereexaminedforaxialflawsfromatleast1directionwitheitherautomatedormanualtechniques.Areasexaminedwerefullydocumentedintheinspectionresults.ThemethodusedtoensurethattheNMP1feedwaternozzlesareexaminedwithequivalenttechniquesisthroughtheuseofmodeling.ThemodelingusedwaswheretheUTbeampathsarepredictedusingraytracingalgorithmswithpredeterminedbeamangleparameters.ThebeampathsareusedtodeterminetheincidentanglesofthebeamontheIDsurfaces.TheincidentanglesoftheUTbeamontheIDsurfacesusedontheNMP1feedwaternozzlewerecomparabletotheGEqualificationmockups.Multipleangle-beamtransducersdesignedfrom"asbuilt"andfabricationwereusedtofullyexaminezones1through5.18 r  
tAPPENDIXCDESCRIPTION OFULTRANICEXAMINATI NPROCEDURES Cont'dD.DCRIPTIONFE-NEGERT-2000AUTMATEDVTINPECTIONSYSTEMCont'dAmplitude-based recording andreporting criteriaisnotusedwiththeGERIS-2000 fornozzleinnerradiusandboreexaminations.
~N4'APPENDIXCDESCRIPTIONOFULTRASNICEXAMINATIONPROCEDURESCont'dVESSELINOZZLE)SAFEEND~BB,/l4B44,4BlFigure1-NouleExaminationZones19 F}}
AllUTdataisrecordedandevaluated.
AnyUTdatathathassignal-to-noise ratiosofgreaterthan2-to-l,hasecho-dynamic characteristics ofcrackingandcanbeconfirmed from2directions oraccompanied bytip-diffracted signalsarecalledcracks.TheGERIS-2000 systemiscapableofdetecting andsizingaxialflaws0.250inchesorlessindepthinfeedwater nozzleinnerradiusandboreregions.Thecapability oftheGERIS-2000 systemfordefectdetection andsizingwasdemonstrated andincludedinNMPCsubmittal June23,1994[Reference
¹13]inEnclosure 1,SectionIII,"Ultrasonic Technique Qualification Plan",whichprovidedadetaileddescription oftheEDMnotchesandfatigue-crack implantsthatareusedtodemonstrate thecapability oftheGERIS-2000 system.Whenobstructions limitedautomated scanningcoverage, supplemental manualexaminations wereperformed.
Inbothcases,fullIDcoveragewasobtainedfromatleastonedirection.
Whenautomated scanningcannotbeperformed frombothdirections, manualtechniques utilizing thesametechniques astheautomated examinations wereused.TheentireIDsurfaceofzones1through5(seeFigure1below)wereexaminedforaxialflawsfromatleast1direction witheitherautomated ormanualtechniques.
Areasexaminedwerefullydocumented intheinspection results.ThemethodusedtoensurethattheNMP1feedwater nozzlesareexaminedwithequivalent techniques isthroughtheuseofmodeling.
ThemodelingusedwaswheretheUTbeampathsarepredicted usingraytracingalgorithms withpredetermined beamangleparameters.
Thebeampathsareusedtodetermine theincidentanglesofthebeamontheIDsurfaces.
TheincidentanglesoftheUTbeamontheIDsurfacesusedontheNMP1feedwater nozzlewerecomparable totheGEqualification mockups.Multipleangle-beam transducers designedfrom"asbuilt"andfabrication wereusedtofullyexaminezones1through5.18 r  
~N4'APPENDIXCDESCRIPTION OFULTRASNICEXAMINATION PROCEDURES Cont'dVESSELINOZZLE)SAFEEND~BB,/l4B44,4BlFigure1-NouleExamination Zones19 F}}

Revision as of 03:27, 29 June 2018

NMP Nine Mile Point Unit 1 Nuclear Power Station Rept of RPV FW & CRD Return Line Nozzle Exams Performed for NUREG-0619...at Culmination of Refueling Outage 13 Which Ended on 950404.
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NIAGARAMOHAWKPOWERCORPORATION NINEMILEPOINTUNIT1NUCLEARPOWERSTATIONREPORTOFREACTORPRESSUREVESSELFEEDWATERANDCONTROLRODDMVERETURNLINENOZZLEEXAMINATIONS performed forNUREG0619BWRFEEDWATER NOZZLEANDCONTROLRODDRIVERETURNLINENOZZLECRACKINGattheculmination ofREFUELING OUTAGENO.13whichendedonApril4,1995Thisdocumentcompleted SEPTEMBER 29,19959510100318 951003PDRADOCK05000220,,P...,PDR,,

l~Q NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)TABLEFCNTENTSINTRODUCTION

...................................

1ACKGROUND

....................................1 BRESULTSOFEXAMINATIONS

.........................

2MODIFICATIONS ANDSYSTEMCHANGES................

2STARTUP/SHUTDOWN CYCLES........................

3LEAKAGEMONITORING

.............................

3VlaARYe~~~~~~~~~~~~~~~~~'o~~~~~~~~~~~~~~~~~~~~3SEFERENCES e~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~o~~~~~5RAPPENDICES A.FEEDWATER ANDCONTROLRODDRIVERETURN.....7LINENOZZLEINSPECTION RESULTSB.MODIFICATIONS ORSYSTEMCHANGESTHAT.......15AFFECTFEEDWATER FLOWORTEMPERATUI&

C.ULTRASONIC EXAMINATION TECHNIQUES

..........

16

~'NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)I.INTRODUCTION Thisreportprovidestheinformation requiredbyNUREG-0619, "BWRFeedwater NozzleandControlRodDriveReturnLineNozzleCracking" (November 1980).Thereportincludes:

Asummaryofmethodsused,theresultsoftheinservice inspections ofthefeedwater andcontrolroddrivereturnline(CRDRL)nozzlesandfeedwater spargerflowholesandweldsinspargerarmsandtees,theeffectsofmodifications orsystemchangesonfeedwater flowortemperature, thenumberofstartup/shutdown cycles,andadiscussion ofthermalsleeveleakagemonitoring.

Theinspections wereperformed bytheGeneralElectricNuclearEnergyCorporation (GE-NE)ofSanJose,California.

H.BACKGROUND NineMilePointUnit1isa620MweBoilingWaterReactor(BWR)whichbeganoperation inNovember1969andhasbeeninserviceforapproximately 26years.Duringthe1977Refueling Outage,NiagaraMohawk(NMPC)removedtheoriginally-installed loose-fit feedwater spargersandreplacedthemwithanimproveddesign(single-piston ring/flow baffleseal).Thefourfeedwater nozzleswereultrasonically (UT)examinedfromthereactorvesselexteriorusingprocedures andtechniques developed byGeneralElectric(GE).ThisUTexamination established abaselineforsubsequent nozzleexaminations.

AsrequiredbyNUREG-0312, "InterimTechnical ReportonBWRFeedwater NozzleandControlRodDriveReturnLineNozzleCracking,"

aninservice UTanddyepenetrant (PT)examination ofthefourfeedwater nozzleswasperformed byGEduringthe1979refueling outage.Nosignificant changesfromthebaselineexaminations wereobserved.

Inaddition, theReactorWaterCleanup(RWCU)returnlinewasreroutedtothefeedwater lines.InNiagaraMohawk'sresponsetoNUREG-0619, datedDecember29,1980,wecommitted toaprogramofperiodicinspections ofthefeedwater andcontrolroddrivereturnlinenozzles.Thefeedwater nozzleUTinspection wastobeperformed everyotherrefueling outageandthevisualinspection (VT)ofthefeedwater spargerswastobeperformed everyfourthrefueling outage,commencing withthe1981outage.ThePTinspection ofthefeedwater andcontrolroddrivereturnlinenozzleswastobeperformed everysixthrefueling outageorevery90startup/shutdown cycles,whichever occurredfirst.ThePTInspection intervals commenced withthe1979refueling outage,duringwhichthebaselinefeedwater nozzlePTinspections weremade.

I NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXA1VHNATIONS 1995REFUELING OUTAGE(RFO-13)H.BACKROUNDCont'dDuringthe1988Refueling Outage(RFO-11),

theNMPCNuclearQualityAssurance Department generated Corrective ActionRequest88.2039-01 todocumentandresolvediscrepancies inpreviousoutages'eedwater nozzleexamination data.Alsogenerated duringthe1988outagewastheRestartActionPlan(RAP).OneoftheRAPspecificissuesaddressed thelackoffullvolumecoverageonfeedwater nozzlesasrequiredbyNUREG-0619.

Allofthecorrective actionsforbothoftheseissueswereidentified andimplemented duringthe1988outage.The1988UTexaminations ofthefeedwater nozzlesperformed bytheNuclearEnergyServicesCo.(NES)revealedindications thatwouldrequiremonitoring duringthefollowing refueling outage.TheUTexaminations conducted duringRFO-12in1993offeedwater nozzle"A"wereperformed byGeneralElectricNuclearEnergy(GE-NE).Theresultsoftheseexaminations werepresented inNMPC'ssubmittal ofAugust25,1993(NMP1L0777)whichindicated norecordable indications andresolvedthoseindications identified in1988duringRFO-11asrequiring additional monitoring.

Visualexaminations (VT)ofthefeedwater spargerflowholesandweldsinspargerarmsandteeswereperformed byGE-NEduringRFO-11in1988andagainduringRFO-12in1993,Theseexaminations indicated noreportable indications.

III.RULTSOFEXAMINATI NTheinspections conducted duringRFO-13in1995wereperformed withtheUltrasonic Test(UT)methodbyGE-NEwhichindicated noreportable indications.

TheseUTexaminations utilizedtheGERIS2000automated systemandmanualUTpickupsoftheRPVnozzlesonfour(4)feedwater andthecontrolroddrivereturnlinenozzles.Theresultsoftheseexaminations andasummaryofallpreviousexaminations arepresented inAppendixAofthisreport.IV.MODIFICATIONS NUREG-0619 requireslicensees toreportallmodifications orsystemchangesthataffectfeedwater flowortemperature andtoconsiderthesechangesinpredicting futurecrackingtendencies.

Sinceour1988outageNUREG-0019 report,therehavebeennomodifications orsystemchangesthataffectfeedwater flowortemperature.

AppendixBtothisreportsummarizes allapplicable physicalandprocedural modifications implemented atNineMilePointUnit1since1977whichaffectfeedwater flowortemperature.

NMPIRPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)V.TARTUP/HUTDWNCYCLThefeedwater andcontrolroddrivereturnlinenozzleshaveexperienced 171startup/shutdown cyclessinceinitialplantoperation.

Thecontrolroddrivereturnlinenozzlehasexperienced only63startup/shutdown cyclessincethePTexamination in1979.Table1providesfurtherdataonthenumberofstartup/shutdown cyclesfromoutagetooutagesince1977.VI.LEAKAGEMNITRINGNiagaraMohawkhasnotinstalled anon-linebypassleakagemonitoring systematNineMilePointUnit1(NMP1).Thethermalsleevedesignincludesflowbafflesthatpreventmixingofthehotreactorwaterandthecolderfeedwater inthenozzleannulus.NUREG-0619, Section4.3.2.4specifically exemptsNMP1fromthisrequirement.

VII.8UMMARYThenondestructive examinations performed duringthe1995Refueling Outage,tu'0-13,identified noreportable indications thatwillrequiremonitoring inaccordance withNUREG-0619.

NMPCanticipates tocontinueutilizing anautomated inspection methodsuchastheGEGERIS2000automated systemforfutureoutagesasdescribed inNMPC'ssubmittal ofJune23,1994(NMP1L0829).

I NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)TABLEINUMBEROFSTARTUPHUTDWNCYCLATNINEMILEINTT1PERIODNUMBEROFCYCLESDURINGPERIODCUMULATIVE 1969InitialStartup-1977Refueling Outage1977Refueling Outage-1979Refueling Outage1979Refueling Outage-1981Refueling Outage1981Refueling Outage-1983Safe-EndOutage1983Safe-EndOutage-1986Refueling Outage1986Refueling Outage-1987Feedwater Transient Outage(1988Refueling Outage)1988Refueling OutageRFO-111993Refueling OutageRFO-121993Refueling OutageRFO-121995Refueling OutageRFO-13951317141795108125127141149166171

VIII.R~RPERRNC NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)2.BWRFeedwater NozzleandControlRodDriveReturnLineNozzleCracking, NUREG-0619, U.S.NuclearRegulatory Commission, November1980.NMPCLetter,D.P.DisctoR.C.Haynes,U.S.NuclearRegulatory Commission, datedJanuary4,1982(

Subject:

Inservice Inspections ofFeedwater NozzlesandSpargersPerformed Duringthe1981Refueling Outage).3.4,5.6.NESLetter,T.J.KochtoT.W.Roman,datedMarch4,1983(

Subject:

February, 1983Feedwater NozzleInnerRadiusExams).NESLetter,W.R.DownstoT.W.Roman,datedJune27,1984(

Subject:

April,1984Feedwater NozzleInnerRadiusExams).NMPCsubmittal totheNRC,datedDecember23,1986,letternumberNMP1L0119(

Subject:

1986RFO-10Feedwater NozzleExamination Results).

NMPCsubmittal totheNRC,datedMarch21,1989,letternumberNMP1L0374(

Subject:

1988RFO-11Feedwater NozzleExamResults/NMPC PlansforFutureExaminations andEvaluation ofIdentified Indications).

7.NRCLetter,datedMay1,1989,(TACNo.72944)(

Subject:

SummaryofApril18,1989MeetingtoDiscussFeedwater Indications atNMP1).8.9.10.12.NMPCsubmittal totheNRC,datedMay5,1989,letternumberNMP1L0394(

Subject:

Feedwater NozzleIndication FractureMechanics Analysis).

NRCSafetyEvaluation ofUltrasonic TestIndications intheFeedwater InletNozzle"A"NearaNozzleSafeEnd(TAC72944),dated9/26/89.NMPCsubmittal totheNRC,datedJanuary11,1991,letternumberNMP1L0560(

Subject:

1988RFO-11Feedwater NozzleExamination Results).

NMPCInternalCorrespondence toUnit1Licensing FilefromN,A,Spagnoletti, datedMarch1,1993,FileCode003631GG(

Subject:

NotesofTeleconwithNRCRegarding Feedwater Nozzle"A"UTInspection).

NMPCsubmittal totheNRC,datedAugust25,1993,letternumberNMP1L0777(

Subject:

1993RFO-12Feedwater Nozzle"A"Examination Results).

I NMP1RPVFEEDWATER ANDCRDRLNOZZLEEXAMINATIONS 1995REFUELING OUTAGE(RFO-13)VIH.REFERENCCont'd13.NMPCNuclearEngineering ReportNo.NER-IM-006 "NineMilePointUnit1Feedwater NozzleFatigueEvaluation,"

datedMay1994,(Reference MPR-1484,Revision0).14.NMPCNuclearEngineering ReportNo.NER-IM-007 "NineMilePointUnit1ControlRodDriveReturnNozzleFatigueEvaluation,"

datedMay1994,(Reference MPR-1485, Revision0).15.NMPCsubmittal totheNRC,datedJune23,1994,letternumberNMP1L0829(

Subject:

AmendNUREG0619Commitment fromPTtoAutomated UTInspection).

16.NRCLetter,datedJanuary12,1995,(TACNo.M89792)(

Subject:

AmendNMPC'sNMP1NUREG0619Commitment utilizing theGERIS2000SystemfromAutomated UTInspection).

IX.APPENDICES APPENDIXAFEEDWATER NZZLEINSPECTION RULTAsstatedinNiagaraMohawk'sletterofDecember29,1980,theNineMilePointUnit1Feedwater andcontrolroddrivereturnlinenozzleswillbeperiodically reinspected atthefollowing intervals:

~Feedwater NozzleUT-everyotherrefueling outage,commencing withthe1981outage.~Feedwater NozzleVT-everyfourthrefueling outage,commencing withthe1981outage.~Feedwater andCRDNozzlePT-everysixthrefueling outageorevery90startup/shutdown cycles,commencing withthe1979refueling.

Duringthe1981refueling outage(RFO-8),aninservice UTexamination ofthefourfeedwater nozzleswasperformed byNESandalsobyGE.Anapparentchangefromthebaselineexamination wasobserved.

Furtherevaluation requiredremovalofthespargerfromthesoutheast nozzle.Basedontheresultsoftheadditional nondestructive examinations, NiagaraMohawkconcluded thattheUTindication wascausedbyageometric reflector andnotbyacrackinthenozzle.Anewfeedwater spargerwasinstalled inthesoutheast nozzle.Thedesignofthenewspargerwasthesameasthereplacement spargersinstalled duringthe1977refueling outage.Duringthe1983safe-endoutage,inservice inspections ofthefeedwater nozzleswerenotrequiredbyNUREG-0619 schedulecommitment.

However,thenozzleswereexaminedbyNESforinformation only.Anincreaseintheamplitude ofthesignalfromthegeometric reflector inthesoutheast nozzlewasnoted.Amorerigorousevaluation ofthisindication wasperformed duringthe1984refueling outageclearlyidentifying anddocumenting thatthisreflector isgeometric andhasexhibited nogrowthorchange.Duringthe1986refueling outage(RFO-10),

inservice UTexaminations ofthefourfeedwater nozzleswereperformed byNES.Nosignificant changesfromthepreviousexaminations wereidentified.

Duringthe1988refueling outage(RFO-11),

inservice UTexaminations ofthefourfeedwater nozzleswereperformed byNES.Theseexaminations identified approximately 25indications inthevicinityofthenozzletosafe-endweldofthenortheast nozzle"A"at45degrees.Althoughtheseindications mighthavebeencausedbyscratchmarksmadeduringspargerinstallation, weconservatively evaluated themascracks.NUREG0619,Section4.3.2.3states,"ifrecordable indications areinterpreted tobecracksinanynozzle,proceedwithspargerremoval,Fl'fthenozzleboreandnozzleblendradius,andrepair."Eighteenofthetwenty-five indications wereobservedat20to25%ofthedistanceamplitude correction e,

APPENDIXAFEEDWATER NZZLEINPETINRULTCnt'dcurve(DAC).However,theapplicable ASMECoderecording criteriais50%DAC.Therefore, theseindications werenot"recordable" anddidnotrequirefurtherevaluation.

Theremaining indications appearedtobetwoseparateflaws,onelocatedinthenozzleandonelocatedinthesafeendweld.Theindications appearedatapproximately 50%DAC.TheflawswereaxiallyorientedandtheirsizewellwithintheASMESectionXIacceptance criteria(a/t-4.7%

and7%versusallowable of11.02%and11.23%).Theexamination wasperformed usinga45degreeshearwavetransducer calibrated onanozzlemock-upwitha5%T-notchreflector.

TheCodepermitscalibration onnotchesupto10%T(Tisthenominalthickness ofthecalibration block).Consequently, theexamination sensitivity exceedstheCoderequiredsensitivity.

Ifa10%Tnotchhadbeenused,theseindications maynothavebeenrecordable perASMESectionXI.Considering thattheexamination wasperformed atahighersensitivity thanrequiredbyCode,thattheindications areatthethreshold oftherecording

criteria, andthattheindications willremainwithinallowable sizeforatleastthenexttwooperating cycles,NiagaraMohawkdetermined thatfurtherevaluation oftheseindications wasnotrequired.

Afracturemechanics evaluation ofthesetwoflawswasperformed.

Theresultsoftheanalysispredicted growthoftheflawsnottoexceed0,001inchesovera40-yearperiod.Therefore, theconclusion wasmadethattheflawswerenotsignificant andshouldnotaffectcontinued plantoperation.

Additionally, NiagaraMohawkcommitted toexaminefeedwater nozzle"A"duringthenextrefueling outage(1993).Duringthe1993refueling outage(RFO-12),

inservice UTexaminations offeedwater nozzle"A"(N4A)Zones1,2,3,and4wereperformed byGeneralElectricNuclearEnergy(GE-NE).Notetheindications identified in1988(RFO-12)werecontained inZone4ofN4A.Thesameultrasonic techniques wereemployedasusedduringthe1988refueling outage(RFO-11)examinations, otherthan,thecalibration standardwasmodifiedtoincludeCodeallowable 10%notchesaswellasthepreviously used5%notches.Theexaminations indicated noreportable indications.

TheZone4indications detectedinthe1988outagewereseenbutnotatrecordable levelsbasedoneitherthe5%or10%notchcalibrations.

ElectricPowerResearchInstitute (EPRI)sizingtechniques werethenattempted toseeifanadequatethrough-wall dimension couldbeattainedonthepreviously recordedindications.

Althoughabasesignalcouldbeseen,notipsignalswerenotedwitheithertheRelativeArrivalTimetechnique ortheAbsoluteArrivalTimetechnique.

Sincenotipcouldberesolved, thesourceofthesereflectors wasdetermined tobefromscratches orinsidediameter(ID)surfaceirregularities andnotfromIDcracking.

Theseinservice inspection resultshavebeenreviewedandapprovedbyaNiagaraMohawkLevelIIIexaminer.

APPENDIXAFEEDWATER NOZZLEINPECTINRULTSCont'dByletterdatedJune23,1994(NMP1L0820),NMPCinformedtheCommission, andprovidedtechnical basisfor,utilization oftheGEGERIS2000automated system(UT)forfutureexaminations inlieuofperforming aPT.ThisamendedourpriorNUREG0619commitment.

InaletterdatedJanuary12,1995,theNRCdetermined thatitwasacceptable forNMPCtoproceedwiththedescribed commitment changesandthatNMPCwouldbeadvisedofthefinalresultsoftheNRCreview.Duringthe1995refueling outage(RFO-13),

inservice examinations wereperformed onfour(4)feedwater andthecontrolroddrivereturnlinenozzles.TheUltrasonic Test(UT)examinations wereperformed byGE-NEandindicated noreportable indications wererecorded.

TheseUTexaminations utilizedtheGERIS2000automated systemandmanualUTpickups.Alloftheseexamination resultshavebeenreviewedandapprovedbyaNiagaraMohawkLevelIIIexaminer,

APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4ANOZZLE45DEGREENORTHEAST RESULTS19771NRI1979NRINRI1981GEOMETRIC REFLECTORS WELDREPAIREDCRACKINBRACKETPIN1983*GEOMETRIC REFLECTORS 1984~GEOMETRIC REFLECTORS GEOMETRIC REFLECTORS RESULTSGEOMETRIC

&NON-GEOMETRIC REFLECTORS 1993FO-12NRINRI1995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG-0619.

PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(I)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS EITHERBEFOREORAFTERSPARGERREPLACEMENT 10

APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4BNOZZLE135DEGREOUTHEASTRESULTS1977119791981219831984~UTVTNRINRINRI1-1/2"LONGX314"5-1I2"LONGX0.8"DISPOSITIONED GEOMETRIC DEEPGEOMETRIC DEEPAMPLITUDE ASGEOMETRIC REFLECTORS INCREASEOF309o8INDICATIONS DISPOSITIONED ASMINORSURFACEIRREGULARITIES NRIRESULTSVT1988FO-11GEOMETRIC REFLECTORS 1993FO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMED UTOTES:NOTREQUIREDBYNUREG4619.

PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(1)(2)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS EITHERBEFOREORAFTERSPARGERREPLACEMENT SPARGERPULLEDFOREVALUATION OFINDICATIONS.

NEWSPARGERINSTALLED.

11

APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4CNOZZLE225DEGREESSOUTHWEST RESULTS19771NRINRI1979NRINRI1981GEOMETRIC REFLECTORS NRI19834GEOMETRIC REFLECTORS 19844ACCEPTABLE INCLUSION 1986FO-10GEOMETRIC REFLECTORS UTGEOMETRIC REFLECTORS

&ACCEPTABLE NON-GEOMETRIC REFLECTORS 1993RFO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG-0619.

PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(I)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS AFTERCOMPLETION OFREPAIRACTIVITIES ANDREPLACEMENT OFSPARGER.12 I

APPENDIXAFEEDWATER NOZZLEINSPECTION RESULTSN4DNOZZLE315DEGREESNORTHWEST

~~RESULTSPT19771NRINRINRI1979NRI1981GEOMETRIC REFLECI'ORSNRI1983*TWOINDICATIONS NOTGEOMETRIC 25%FSH1984+NRI1986FO-10GEOMETRIC REFLECTORS RESULTSUTVT1988RFO-11GEOMETRIC REFLECTORS NRI1993FO-12NRI1995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG4619.

PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT(1)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS AFTERCOMPLETION OFREPAIRACTIVITIES ANDREPLACEMENT OFSPARGER.13

APPENDIXACONTROLRODDRIVERETURNLINENOZZLEINSPECTION RTN9NOZZLE44.1-WD417/01S-IR RESULTS19771197919811983~19848'986 FO-10NRIRESULTS1988FO-111993RFO-121995FO-13NRIAMENDEDMETHODPERFORMED UTNOTES:NOTREQUIREDBYNUREG-0619.

PERFORMED FORINFORMATION ONLY.THE1983SAFE-ENDREPLACEMENT OUTAGEISNOTCONSIDERED AREFUELING OUTAGEBYNIAGARAMOHAWK.NRIUTPTVT0)NOREPORTABLE INDICATION ULTRASONIC TESTINGDYEPENETRANT TESTINGVISUALTESTINGNOREPORTABLE INDICATIONS EITHERBEFOREORAFTERSPARGERREPLACEMENT 14

~~4APP~~IX3MODIFICATION ORSYSTEMCHANGESAFFECTFEEDATERFLWORTEMPERAE1997.Feedwater nozzlecladdingremovedandspargersreplacedwithimproveddesign.~179ReactorWaterCleanupreturnlinereroutedtothefeedwater lineinaccordance withSection4.2ofNUREG-0619.

1981Replacedsoutheast spargerafterevaluation ofUTindications.

1983Thefeedwater lowflowcontrolvalveswerereplacedwithnewvalvesdesignedtoimprovecontrolatlowflowconditions.

Inaddition, asix-inchrecirculation linewasinstalled toprovideimprovedflowcontrolofthefeedwater system.Thesemodifications werepreviously described inourletterdated9/8/81.19914InresponsetoNUREG0737,ActionItemII.D.1,instrument andcontrolequipment wereinstalled toprovideahighreactorleveltripofthemotor-driven feedwater pumps.Inaddition, theHPCIcontrolsystemwasmodifiedtoaddannunciator alarmsforlossofHPCIfailuresignalinstandbymode.1998iThefollowing changesweremadetoimprovethereliability ofthefeedwater system:1.Modifiedhighleveltripcircuitsealinlogic.2.Modifiedmainflowvalvelockupcircuitstowithstand momentary powerinterruptions.

3.Modifiedlogictoclose6-inchrecirculation valveonpumpstartsignalforrunoutprotection.

4.ModifiedlogictocloselowflowcontrolvalvesonHPCIinitiation.

199Noadditional modifications orsystemchangesthataffectfeedwater flowortemperature.

~193Turbinedrivenfeedwater pumpflowcontrolvalveswerereplacedbyasingleflowcontrolvalve;thischangehadnoaffectonfeedwater flowortemperature.

~195Noadditional modifications orsystemchangesthataffectfeedwater flowortemperature.

15

APPENDIXCDESCRIPTION OFTRANIEXAMINATI NPRCEDA.IIXILPPWM~TheNESfeedwater nozzleUTexamination procedure wasfirstusedatNineMilePointUnit1in1981.Thisprocedure dividedthenozzleinnerradiusandboresurfacesintotwozones,NESZone1examinations areperformed fromthereactorvesselshell;NESZone2examinations areperformed fromthenozzlebarrel.NESZone1andZone2examinations overlapattheinsideradiussurfaceofthenozzle.Examinations performed fromthereactorvesselshellareperformed byattaching aspecially designedlucitewedge,whichconformstothereactorvesseloutsideradius,toanultrasonic transducer suchthatthelongitudinal beamangleisfixed.Examinations performed fromthenozzlebarrelareperformed usingcompoundanglebeamshearwavetechniques.

Inthiscase,anumberofspecially designedfixedcompoundanglelucitewedgeswhichconformtotheoutsideradiusofthenozzlebarrelareused.In1988,additional scansandscanningangleswereusedonthesafe-endbore,nozzlebore,andtheinnerradiustoensureoptimalinterrogation oftherequiredvolumes.Recording criteriawasupdatedformoreuniformity whencomparing datafromeachoutage.Anewtemplatewasdesignedandbuilttofacilitate shell-side exams.B.~GEPC.URBTheGEfeedwater nozzleUTexamination procedure wasusedforthe1977baselineandthe1979inservice inspections atNineMilePointUnit1.Thisprocedure dividesthenozzleinnerradiusandboresurfacesintothreezones.TheGEZone1examination isperformed byattaching anultrasonic transducer toaspecially designedlucitewedge,whichconformstothereactorvesseloutsideradius,suchthatthelongitudinal beamangleandthecircumferential beamanglearefixed.TheGEZone2examination isperformed byattaching anultrasonic transducer toaspecially designedlucitewedge,whichconformstotheouterdiameterblendradiusofthenozzle,suchthatthelongitudinal beamangleandthecircumferential beamanglearefixed.TheGEZone3examination isperformed byattaching anultrasonic transducer toaspecially designedlucitewedge,whichconformstotheoutsideradiusofthenozzlebarrel,suchthatthecircumferential beamangleisfixed.16

tAPPENDIXCDESCRIPTION OFULTRANICEXAMINATION PROCEDURC.NMPCPROCEDURE NiagaraMohawkNDEProcedure (No.NDEP-UT-6.07) wasusedtoUTexaminefeedwater nozzle"A"(N4A)Zones1,2,3,and4duringthe1993refueling outage(RFO-12).

Thisprocedure utilizedmanualtechniques andequipment whicharesimilarandequivalent tothoseusedbyNESduringthe1988refueling outage(RFO-11).Theultrasonic techniques employedarethesameasthoseusedfortheRFO-11examinations, otherthan,thecalibration standardwasmodifiedtoincludeCodeallowable 10%notchesaswellasthepreviously used5%notchesforthesafe-endboreexamination.

Theseexaminations wereperformed byGeneralElectricNuclearEnergy(GE-NE)personnel.

D.DESCRIPTION OFGE-NEGERIS-2000 AUTOMATED VTINSPECTINYTEMF-13TheGERIS-2000 UTImagingSystemisanautomated ultrasonic dataacquisition andimagingsystem.Automated scannersinterfaced totheGERIS-2000, movedUTtransducers radiallyandcircumferentially aroundtheoutsidesurfaceofthenozzleandadjacentsurfacesofthesafe-endandreactorpressurevessel.UTdatawascollected andstoredindigitalformat.ThecompleteRFwaveformwasdigitized andrecordedonopticaldisksforanalysis, TheGERIS-2000 UTsubsystem isamultiplexed logarithmic UTflawdetection instrument.

Foreachchannel,thecompleteRFA-scanwasdigitized andstoredonopticaldisks.ThesystemstorestheRFsignalinlogarithmic formatthathasaninstantaneous dynamicrangethatisgreaterthan85dB.Thelogarithmic UTsystemallowstherecording ofthepeaksoflowandhighamplitude UTsignalsatthesametimewithoutclippingUTsignals,suchaswouldoccurwithlinearsystemsthathaveaninstantaneous dynamicrangegenerally lessthan45dB.TheanalysisoftheGERIS-2000 datautilizedadvancedinteractive colorgraphicstoevaluateandassistincharacterizing indications fromservice,fabrication andgeometric relatedUTreflectors.

Coordinated A-,B-,C-,volumetric side-view-,

volumetric end-view-,

and3D-scansareprovidedonahighresolution (1280by1024pixels)colordisplay.Severalchannelsmaybedisplayed atonetimetocorrelate indications fromdifferent channels.

Thesegraphicdisplayshaveanadjustable colorscalethatprovidesthebestresolution offlawdetection andcharacterization downtothematerialnoise.NMPCsubmittal ofJune23,1994tReference

¹13]includedEnclosure 1,SectionII,"Ultrasonic Inspection Techniques",

whichprovidedadescription oftheGERISUTtechniques, UTinstrumentation andscanningequipment indetail.17

tAPPENDIXCDESCRIPTION OFULTRANICEXAMINATI NPROCEDURES Cont'dD.DCRIPTIONFE-NEGERT-2000AUTMATEDVTINPECTIONSYSTEMCont'dAmplitude-based recording andreporting criteriaisnotusedwiththeGERIS-2000 fornozzleinnerradiusandboreexaminations.

AllUTdataisrecordedandevaluated.

AnyUTdatathathassignal-to-noise ratiosofgreaterthan2-to-l,hasecho-dynamic characteristics ofcrackingandcanbeconfirmed from2directions oraccompanied bytip-diffracted signalsarecalledcracks.TheGERIS-2000 systemiscapableofdetecting andsizingaxialflaws0.250inchesorlessindepthinfeedwater nozzleinnerradiusandboreregions.Thecapability oftheGERIS-2000 systemfordefectdetection andsizingwasdemonstrated andincludedinNMPCsubmittal June23,1994[Reference

¹13]inEnclosure 1,SectionIII,"Ultrasonic Technique Qualification Plan",whichprovidedadetaileddescription oftheEDMnotchesandfatigue-crack implantsthatareusedtodemonstrate thecapability oftheGERIS-2000 system.Whenobstructions limitedautomated scanningcoverage, supplemental manualexaminations wereperformed.

Inbothcases,fullIDcoveragewasobtainedfromatleastonedirection.

Whenautomated scanningcannotbeperformed frombothdirections, manualtechniques utilizing thesametechniques astheautomated examinations wereused.TheentireIDsurfaceofzones1through5(seeFigure1below)wereexaminedforaxialflawsfromatleast1direction witheitherautomated ormanualtechniques.

Areasexaminedwerefullydocumented intheinspection results.ThemethodusedtoensurethattheNMP1feedwater nozzlesareexaminedwithequivalent techniques isthroughtheuseofmodeling.

ThemodelingusedwaswheretheUTbeampathsarepredicted usingraytracingalgorithms withpredetermined beamangleparameters.

Thebeampathsareusedtodetermine theincidentanglesofthebeamontheIDsurfaces.

TheincidentanglesoftheUTbeamontheIDsurfacesusedontheNMP1feedwater nozzlewerecomparable totheGEqualification mockups.Multipleangle-beam transducers designedfrom"asbuilt"andfabrication wereusedtofullyexaminezones1through5.18 r

~N4'APPENDIXCDESCRIPTION OFULTRASNICEXAMINATION PROCEDURES Cont'dVESSELINOZZLE)SAFEEND~BB,/l4B44,4BlFigure1-NouleExamination Zones19 F

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