ML17059B018

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

"~~~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~..RiMaaa Tnn~C~~~an

<<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

~oe VESSELNOZZLE.ze"gFIGURE5-EDHNOTCHESINGRINDOUTS

GRIHnOUTFIGURE1-Z2ABEANPLOTS o0 GRINDOUTFIGURE2-Z2BBEAMPLOTS Io

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BEANANGLEi45jROTATIONANGLE<90'VSCANSURFACEiSAFEENDSCAN<START0IhbEND25IN)STEP5INMETALPATH<MIN1,2INMAX1.2INIII0IB0IBIIB0IB0II0000I00I00I00IIB0I0II00I4I0400IIII000BIIIII0I0IIII04IIII0II0IIIBIIIII0BIIIIIIII'III0IIIIIIIIeIaIeaIIeIIaIoIIeoeIaoaIIeeeaaIIIIeIea0IIIIIeeaeaeIIeIeaIoIIIIIIIoZsa 0 GENE-95502-0195 APPENDIXBALPHAANGLE ~o FEEDVATER 3EAMANGLE60'JROTATIONANGLE19,8'CVSCANSURFACE>VSLGRSCAN'TART 0INJEN310INjSTEP1INMETALPATHiMIN12.6INMAX16INZ4A7767567~449'6~7/~0+9717'5635l5376563sa53~6765627sa67357565564656767636767~57565556SI656767676757~6363@>6566 676757616363SI656667 ~6767AAIa6a6asg6363646566 676766656asa~~~6566 ~o FEEHVATER 3EAMANGLE60'jROTATIONANGLE19,8'VSCANSURFACE>VSLORSCAN>START0INJEND10INjSTEP1INMETALPATH<MIN12.6INMAX16IN~v6a75pa76pa766665sc67<<65sesasa ei66656am.~m eieeam6g6a656$-56~5755eieeev4'65s56~b-I55sieee~64555659si67eleasy659eis676sa576767ey6665646362 ei66766605766sv"6>svev~.65eeeasasi 65eecv67gp67 ~o FEEDWATER BEAMANGLE65'jRCITATION ANGLE9,5'VSCANSURFACE1VSLDRSCAN'TART 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BEANANGLE>655'gROTATIONANGLE>23'CVSCANSURFACE1ODBRSCAN',START 55jEND90'jSTEP2.5'ETALPATH>MIN6,2INMAX8,8INrtatSt5656S656565656tStStStStStSt565656565656t254t54R~~~5656565656565656565858585858585e5858565656565656565656585858585858586158585858585858585861'61 61616161616161585e5858585858 585861616161616161616161616161616161616161616161616161 0,0 FEEDVATER BEAMANGLEI39,6'jROTATIONANGLEI46,8'VSCANSURFACEIBARRELSCANSTART0INjEND5INjSTEP5INMETALPATHIMIN6.4INMAX7.8INKih78vevavavavavevavevava78vavsvsvavavavsvavavaveva7878vevsvavavevevavavs178787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787878787787S78181818781878781S7818187818187878181818181818vs7878187878187878781'If/If'Cj'g',If 'Ig'g@676767676767676767676767676767676767676767676767676767676767676767676767 Oo0 FEEDVATER 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