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-955402-0195 NINEMILEUNIT1FEEDWATER NOZZLEANALYSISJanuary20,1995S.C.Mortenson GENERALELECTRICNUCLEARENERGY12200HerbertWayneCourtSte100Huntersville, NC28078Approved:

J.W.elfManagrInspenService9512220192 951215PDRADQCK05000220...,P,,,,PDR

~o GENE-955-002-0195 IMPORTANT NOTICEREGARDING CONTENTSOFTHISDOCUMENTPleaseReadCarefully Theonlyundertakings oftheGeneralElectricCompany(GE)respecting information inthisdocumentarecontained inthePurchaseOrderbetweenNiagaryMohawkPowerCorporation, andGE,titled"Contract betweenNiagaraMohawkPowerCorporation andGeneralElectricCompanyfor1995OutageServices(RFO13)",

effective February18,1994,asamendedtothedateoftransmittal ofthisdocument, andnothingcontained inthisdocumentshallbeconstrued aschangingthecontract.

Theuseofthisinformation byanyoneotherthantheNiagaraMohawkPowerCorporation, orforanypurposeotherthanthatforwhichitisintended, isnotauthorized:

andwithrespecttoanyunauthorized use,theGEmakesnorepresentation orwarranty, andassumesnoliability astothecompleteness,

accuracy, orusefulness oftheinformation contained inthisdocument, orthatisusemaynotinfringeprivately ownedrights.

GENE-955-002-0195 NINEMlLE1FEEDWATER NOZZLEANALYSISThisdocumentsummarizes theevaluations performed byGEontheNineMileUnit1Feedwater nozzle.Theevaluations werebrokenintwoareas.ThefirstwastheGENozzleModelingofZones1thru5andthesecondwasamanualassessment ofthedeepestgrindoutintheSWFeedwater nozzle.FEEDWATER NOZZLEMODELINGGENozzleModelinganalysiswasperformed oninsidediameter(ID)surfacesoftheNineMile1Feedwater nozzleidentified asZones1thru5.TheIDsurfaceareaofintereststartedattheintersection ofthereactorpressurevessel(RPV)IDsurface-to-nozzle taperareaofZone1andextendedintothenozzleboretotheSafeEndregionofZone5.Theultrasonic parameters (beamandrotationangles)usedinthemodelingwereoptimized toobtainthebestoverallcoveragewiththeleastamountofscanningsetupswhich,inthelongrunaffectsthescanningtimeandtheradiation exposurerecieved.

Withtheseparameters, theentireinsidediameter(lD)surfacewillbeexaminedwithsoundbeam-to-flaw angleswithintheboundsdetermined onGE'sfeedwater nozzlemockup.TheboundrylimitsfortheGENozzleModelingaredocumented inGE-NE-C3100016-02.

Nottakenintoaccountwereanyrestrictions thatwouldimpairtheUTexaminations.

GE'sexperience hasbeenonnozzleswithrestrictions, supplemental manualmethodstogetherwiththeGERIS2000havebeenabletoobtain100%coverage(fromatleastonedirection).

GRINDOUTANALYSISModelingDuetothecomplexgeometries producedbygrindouts, manualmethodswereusedtoanalyzethebottomIDsurfacesofoneofthedeepestgrindouts.

Theanalysisprocessinvolvedthefollowing steps:1.Constructing a3dwireframe oftheNineMile1feedwater nozzle.

~o0 GENE-955-002-0195 2.Superimposing asurfacecontour(3dpolyline) ofthegrindoutbottomintothe3dwireframe.

Thepolylinewasconstructed usingthedimensions takenfromamoldmadefromthisgrindout.

3.Three-Dimensional UTbeamraytracingwasperformed ineightpositions alongthelengthofthegrindout.

Thisdata,represented as3dlineswasalsoinsertedintothe3dwireframe.

Fourlocations wereplotted(Figure1)withthescanfromthenozzleODblendradius(Z2A),fourlocations wereplottedwiththescansfromthenozzleODcylinerical surface(Figures2and3).4.ThelocationatwhichtheUTbeamintersects thebottomofthegrindoutisthendetermined.

Atthislocationtheangleofgrindoutsurfaceismeasured(NIDANG)andtheaxisofapostulated axialflawiscalculated.

,5.Thealphaandbetaanglesofthesoundbeamtotheflawaxiswhichdetermine theeffectiveness oftheUTbeamarethencalculated.

TheresultsarelistedinTable1below.IDSCANNIDANGBETAALPHAZ2AZ3Z31217192032313026191024605040'0533543Table1.NineMileSWFeedwater GrindoutAnalysisAlldataiswithintheboundsdetermined fromtheGEFeedwater nozzlemockup,exceptone,theBetaanglefor¹7Zone3.Thisdatapointwas35',whichwasonedegreeunderthelowerlimitof36'hichisdetermined frompreviously collected dataontheGEnozzlemockup.Thisonedegreevaluebelowwhatwasdetermined ontheGEmockup,shouldnoteffectthedetectability offlawsinthisregion.Apreviousstudyperformed byAEAforGEusedalowerlimitof35'.Inaddition, thisregioniswithintheacceptable limitsoftheZ2Bscans.

~iU GENE-955-002-0195 Grindouts intheGE'sNozzleMockupTofurtherconfirmthedetection offlawsinthebottomofgrindouts, mockuptestingwasperformed.

Todemonstrate thedetection offlawsinthebottomgrindouts, electromagnetic discharge machine(EDM)notchesweremadeinthebottomoftwogrindouts inanozzlemockup.Withthesamedesignparameters asusedontheNineMile1Feedwater nozzle,theareaswereexaminedwiththeGERIS2000(Figures4and5).Examinations withtheGERIS-2000 wereperformed preandpostEDM.Asexpected, duringthereviewofthepreEDMexamination data,lowlevelsignalamplitudes inthegrindoutareaswererecorded.

However,duringthereviewofthepost-EDMexamination data,higher-than-previously recordedgrindoutsignalswererecorded.

Ingeneral,theseUTsignalsrecordedwere:1.Higherinamplitude thanthegrindoutsignals(4xor12dB);2.Accompanied byTip-diffracted signalsfromthenotchtip;and3.Mode-converted UTsignalsfromthenotchwereobserved.

Therewasclearlyasdifference betweenthepreandpostexamination withtheGERIS-2000 astothepresenceornotofreflectors inthebottomoftheGEnozzlegrindouts.

~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

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<<veann101o44I%124~IS04121St128.9219SS2142AO~4920~SSOOIS?ANVIICDist/Tlme1 Start-136.16.End-133.60.Diff-2.56Amp(dB/MDAC):

St-67.3/58,End-84.0/9,Dif-16.6/49oMn-75.6/33 POST-EDMUT

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GRIHnOUTFIGURE1-Z2ABEANPLOTS o0 GRINDOUTFIGURE2-Z2BBEAMPLOTS Io

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