ML17059B018

Nine Mile Unit 1 Feedwater Nozzle Analysis.

ML17059B018
Person / Time
Site:	Nine Mile Point
Issue date:	01/20/1995
From:	MORTENSON S C, SELF J W GENERAL ELECTRIC CO.
To:
Shared Package
ML17059B019	List: ML17059B018 ML17059B020 ML17059B021 ML17059B022 ML18040A240
References
GENE-955-002-01, GENE-955-002-0195, GENE-955-2-1, GENE-955-2-195, NUDOCS 9512220192
Download: ML17059B018 (68)

Text

GENE-955402-0195NINEMILEUNIT1FEEDWATERNOZZLEANALYSISJanuary20,1995S.C.MortensonGENERALELECTRICNUCLEARENERGY12200HerbertWayneCourtSte100Huntersville,NC28078Approved:J.W.elfManagrInspenService9512220192951215PDRADQCK05000220...,P,,,,PDR

~o GENE-955-002-0195IMPORTANTNOTICEREGARDINGCONTENTSOFTHISDOCUMENTPleaseReadCarefullyTheonlyundertakingsoftheGeneralElectricCompany(GE)respectinginformationinthisdocumentarecontainedinthePurchaseOrderbetweenNiagaryMohawkPowerCorporation,andGE,titled"ContractbetweenNiagaraMohawkPowerCorporationandGeneralElectricCompanyfor1995OutageServices(RFO13)",effectiveFebruary18,1994,asamendedtothedateoftransmittalofthisdocument,andnothingcontainedinthisdocumentshallbeconstruedaschangingthecontract.TheuseofthisinformationbyanyoneotherthantheNiagaraMohawkPowerCorporation,orforanypurposeotherthanthatforwhichitisintended,isnotauthorized:andwithrespecttoanyunauthorizeduse,theGEmakesnorepresentationorwarranty,andassumesnoliabilityastothecompleteness,accuracy,orusefulnessoftheinformationcontainedinthisdocument,orthatisusemaynotinfringeprivatelyownedrights.

GENE-955-002-0195NINEMlLE1FEEDWATERNOZZLEANALYSISThisdocumentsummarizestheevaluationsperformedbyGEontheNineMileUnit1Feedwaternozzle.Theevaluationswerebrokenintwoareas.ThefirstwastheGENozzleModelingofZones1thru5andthesecondwasamanualassessmentofthedeepestgrindoutintheSWFeedwaternozzle.FEEDWATERNOZZLEMODELINGGENozzleModelinganalysiswasperformedoninsidediameter(ID)surfacesoftheNineMile1FeedwaternozzleidentifiedasZones1thru5.TheIDsurfaceareaofintereststartedattheintersectionofthereactorpressurevessel(RPV)IDsurface-to-nozzletaperareaofZone1andextendedintothenozzleboretotheSafeEndregionofZone5.Theultrasonicparameters(beamandrotationangles)usedinthemodelingwereoptimizedtoobtainthebestoverallcoveragewiththeleastamountofscanningsetupswhich,inthelongrunaffectsthescanningtimeandtheradiationexposurerecieved.Withtheseparameters,theentireinsidediameter(lD)surfacewillbeexaminedwithsoundbeam-to-flawangleswithintheboundsdeterminedonGE'sfeedwaternozzlemockup.TheboundrylimitsfortheGENozzleModelingaredocumentedinGE-NE-C3100016-02.NottakenintoaccountwereanyrestrictionsthatwouldimpairtheUTexaminations.GE'sexperiencehasbeenonnozzleswithrestrictions,supplementalmanualmethodstogetherwiththeGERIS2000havebeenabletoobtain100%coverage(fromatleastonedirection).GRINDOUTANALYSISModelingDuetothecomplexgeometriesproducedbygrindouts,manualmethodswereusedtoanalyzethebottomIDsurfacesofoneofthedeepestgrindouts.Theanalysisprocessinvolvedthefollowingsteps:1.Constructinga3dwireframeoftheNineMile1feedwaternozzle.

~o0 GENE-955-002-01952.Superimposingasurfacecontour(3dpolyline)ofthegrindoutbottomintothe3dwireframe.Thepolylinewasconstructedusingthedimensionstakenfromamoldmadefromthisgrindout.3.Three-DimensionalUTbeamraytracingwasperformedineightpositionsalongthelengthofthegrindout.Thisdata,representedas3dlineswasalsoinsertedintothe3dwireframe.Fourlocationswereplotted(Figure1)withthescanfromthenozzleODblendradius(Z2A),fourlocationswereplottedwiththescansfromthenozzleODcylinericalsurface(Figures2and3).4.ThelocationatwhichtheUTbeamintersectsthebottomofthegrindoutisthendetermined.Atthislocationtheangleofgrindoutsurfaceismeasured(NIDANG)andtheaxisofapostulatedaxialflawiscalculated.,5.ThealphaandbetaanglesofthesoundbeamtotheflawaxiswhichdeterminetheeffectivenessoftheUTbeamarethencalculated.TheresultsarelistedinTable1below.IDSCANNIDANGBETAALPHAZ2AZ3Z31217192032313026191024605040'0533543Table1.NineMileSWFeedwaterGrindoutAnalysisAlldataiswithintheboundsdeterminedfromtheGEFeedwaternozzlemockup,exceptone,theBetaanglefor¹7Zone3.Thisdatapointwas35',whichwasonedegreeunderthelowerlimitof36'hichisdeterminedfrompreviouslycollecteddataontheGEnozzlemockup.ThisonedegreevaluebelowwhatwasdeterminedontheGEmockup,shouldnoteffectthedetectabilityofflawsinthisregion.ApreviousstudyperformedbyAEAforGEusedalowerlimitof35'.Inaddition,thisregioniswithintheacceptablelimitsoftheZ2Bscans.

~iU GENE-955-002-0195GrindoutsintheGE'sNozzleMockupTofurtherconfirmthedetectionofflawsinthebottomofgrindouts,mockuptestingwasperformed.Todemonstratethedetectionofflawsinthebottomgrindouts,electromagneticdischargemachine(EDM)notchesweremadeinthebottomoftwogrindoutsinanozzlemockup.WiththesamedesignparametersasusedontheNineMile1Feedwaternozzle,theareaswereexaminedwiththeGERIS2000(Figures4and5).ExaminationswiththeGERIS-2000wereperformedpreandpostEDM.Asexpected,duringthereviewofthepreEDMexaminationdata,lowlevelsignalamplitudesinthegrindoutareaswererecorded.However,duringthereviewofthepost-EDMexaminationdata,higher-than-previouslyrecordedgrindoutsignalswererecorded.Ingeneral,theseUTsignalsrecordedwere:1.Higherinamplitudethanthegrindoutsignals(4xor12dB);2.AccompaniedbyTip-diffractedsignalsfromthenotchtip;and3.Mode-convertedUTsignalsfromthenotchwereobserved.TherewasclearlyasdifferencebetweenthepreandpostexaminationwiththeGERIS-2000astothepresenceornotofreflectorsinthebottomoftheGEnozzlegrindouts.

~o FIGURE4GERIS2000DATA,.It.'Ev"'4",I~I\'ov,'oI17,'o11t~-~ai9'~.4".'~III~,~'\y~yy19'o~vpo+I"IIfIo~'aSytsavoowooDy~ttyna~FL[1117[0278[000I~III~'RE-EDMUTX=1.884inY~-17.494in2n12.440inXn4.150inDisplngAngleo-20.600OIA410824IIS04121%2128.'7219SS2~42oIO14920ISIy00182ANIIICRACEOFF+010IoI;'t'III~xr..~o'o'oI.,t"~~~I'tvav~I8o,,'.1V/ICtot~I,1Xa2.858inYo-17.361in2o12.510in'Ia~>I'r1~Alvo,~I~~~11~v'1y~'1Jb~~'~~II11~',~I)IoX=4.559inDisplogAngle=-20.600I[115]7[028)8[000)IIIC~aranMn-nToi~..RiMaaaTnn~C~~~an<<veann101o44I%124~IS04121St128.9219SS2142AO~4920~SSOOIS?ANVIICDist/Tlme1Start-136.16.End-133.60.Diff-2.56Amp(dB/MDAC):St-67.3/58,End-84.0/9,Dif-16.6/49oMn-75.6/33POST-EDMUT

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GRIHnOUTFIGURE1-Z2ABEANPLOTS o0 GRINDOUTFIGURE2-Z2BBEAMPLOTS Io

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