ML17249A907

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Submits Addl Info Re Tendon Insp & lift-off Verification,In Response to NRC 800326 Ltr.Also Forwards Revised Pages & Tables for GAI-2074, Evaluation of Prestressed Tendon Forces.
ML17249A907
Person / Time
Site: Ginna Constellation icon.png
Issue date: 05/13/1980
From: WHITE L D
ROCHESTER GAS & ELECTRIC CORP.
To: ZIEMANN D L
Office of Nuclear Reactor Regulation
Shared Package
ML17249A908 List:
References
NUDOCS 8005210500
Download: ML17249A907 (38)


Text

REGULATORvNFORMATIONDISTRIBUTIONS'"TEM(RIDS)~0/y'CCESSIONNBR:8005210500DOC,DATE:80'/05/13NOTARIZED:NODOCKETFACIL:50244RobertEmmetGinnaNuclearPlantiUnit1PRochesterG05000244AUTH~NAME),AUTHORAFFILIATIONHHITEPL,D.')B'altimoreGas8ElectricCo.RECIP~NAME'RECIPIENTAFFILIATIONOfficeofNuclearReactorRegulationZIEMANNE0~L~Procedures8TestReviewBranchSUBJECT;Submitsaddiinforetendoninsp8lift-offverificationginresponsetoNRC800326ltr.Alsoforwardsrevisedpages8tablesforGAI2074'EvaluationofPrestressedTendonForces,"OISTRISUTIONCODE:ASSISCOPIESRECEIVED:LTRENCLISIZE:WZ4TITLE:GeneralDist~ibutionforafterIssuanceofOperating'LicNOTES:g+,'~Cl.lSOA'~E',~Dgal~+IYJRECIPIENTCOPIESRECIPIENTIDCODE/NAMELTTRENCLIDCODE/NAMEACTION;05BC6R8W~77COPIESLTTRENCLINTERNAL:012IEE17ENGRBR19PLANTSYSBR21EFLTTRTSYSOELDEXTERNAL:03LPDR23ACRS112211111101161602NRCPDR15COREPERFBR18REACSFTYBR20EEBEPB~DORSTSGROUPLEADR00NSIC1111111111111oTOTALNUMBEROFCOPIESREQUIRED~LTTR~ENCL r0-P~nfr~llr'lIIf1lI,PfI,'ir,g~,rII4~rlI'1I,lfe"~~>rrialrfffll(ffQ(~4Nrt8~IIf$>g~)

fp1pwzuzmIIIII/Ill/III/IIIII/////////////////I//////ROCHESTERGASANDELECTRICCORPORATIONgl~0IsaOq,'1AECI~.~svEASTAVENuE,ROCHESTER,N.V.~iidrLEONO.WHITE,JR.VICEPRESIDENTTELEPHONEAREACODE710546-2700May13,1980DirectorofNuclearRegulationAttention:Mr.DennisL.Ziemann,ChiefOperatingReactorsBranch52U.S.NuclearRegulatoryCommissionWashington,D.C.20555

Subject:

TendonInspectionandLift-OffVerificationGinnaNuclearPowerPlantDocketNo.50-244

DearMr.Ziemann:

InresponsetoyourletterdatedMarch26,1980,wehavepreparedthefollowinginformation.Also,revisedsheetsdatedApril11,1980tobeincorporatedintothereport"EvaluationofPrestressedTendonForces-RobertE.GinnaNuclearPowerStation"areincludedasAttachment1tothisletter.ResonsetouestionNo.1:Regardingthestatementmadeinthefirstsentence,shrinkageisnot,consideredtobeanimportant.factorcontributingtolossofprestress.AsseenfromTable2ofthereport,shrinkageaccountsforonly2.8kips(2.1%)ofthetotal40yr.lossof130.5kips.Shrinkagetestswereconductedonvarioustrialconcretemixdesigns.ThetestswereinaccordancewithASTMC-494,"ChemicalAdmixturesforConcrete."Theresultswereusedforcomparingtheshrinkageofvariousmixdesigns.Thmshrinkagevalues,whichwereintheneighborhoodof250x10in./in.at28days,werebasedon3in.squarebyll~in.longspecimenswhichwerestoredinairat73'Fand50%relativehumidity.Theshrinkagestrainswhichthesespecimensexperiencedarenotapplicabletothoseoccurringinthe3ft.6in.massivecontainmentwalls.Thesewallshaveavolume-to-exposedsurfaceratioof42in.,versus0.7in.forthetestspecimens.Theinformationgiveninref-erences(4)and(6)ofthereportindicatesthat100x10in./in.isaconservativelylarge40yr.shrinkagestrainforV/S=42in.

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ROCHESTERGASANDELECTCCORP.DATEMay13,1980ToMr.DennisL.ZiemannSHEETNO.2Projectdocumentsidentifytheconcretemizdesignusedforthecontainmentwallas:Cement(TypeII)FineAggregateCoarseAggregate(N.Y.51)(N.Y.82)WaterAdmixtures658lbs.(7sacks)1310lbs.1290lbs.440lbs.35.7gals.(298lbs.)DarezPlastiment4.5oz.peryard21oz.peryardThewater-cementratioofthemizis0.45(byweight).NeithertheProposedRegulatoryGuide1.35.1noritsreferenceddocument,Reference(4),explicitlyrelatesshrinkagetowater-cement.ratio.TheshrinkagetestspecimensofReference(4)contained5.44sacksofTypeIIIcementpercubicyard,andsomesealedspecimenswereincluded.AlthoughReference(4)doesnotstatethewatercontentforthespecimens,itwouldbeexpectedthatthisconcretehadawater-cementratioequaltoorgreaterthanthatoftheGinnacontainmentconcretewhichuseda0.45water-cementratio.Asstatedinthereport,theMeanDailyRelativeHumidityfortheGinnasiteisinthe70%to80%range.Thishumdityiswithinthe40%to8(%rangeofProposedRegulatoryGuide1.35.1forwhich100x10in./in.isspecified.Therefore,itisconcludedthattheshrinkagevalueofReference(4)asappliedtotheGinnacontainmentconcreteisconservative.ResonsetouestionNo.2:Twobasictypesofshrinkageoccurinconcrete:dryingshrinkageandautogeneousshrinkage.Duetothemassivenatureofthe42"thickcontainmentwall,mostoftheverticalshrinkageofthewallthatissignificantenoughtocausealossofprestressforce,occursoveritsinteriorandisduetoautogeneousshrinkage.Itisgenerallyacceptedthatautogeneousshrinkageisassumedtostartassoonasthehydrationprocessstarts.Thus,tosimulatethiscondition,"onehourafterconcreteplacement"wasusedtostarttheshrinkagestraincurveinFigure3ofthereport.AsshowninFigure2ofthereport,theconcreteplacementinthecontainmentwallstartedinApril1967andwascompletedinJune1968.Useoftheaverageplacementdatefortheshrinkage lII ROCHESTEROASANDELECTCORP.DATEMay13,1980ToMr.DennisZ.ZiemannSHEETNO.3straincalculationassumesthatthelowerhalfofthewallwasconstructedpriortothisaveragedateandtheupperhalfwasconstructedafterthisaveragedate.Thus,atanypointintime,concreteinthelowerhalfofthewallwouldexperienceshrinkagestrainsgreaterthanthatpredictedbasedontheaveragedate,andconcreteintheupperhalfwouldexperienceshrinkagestrainslessthanthatpredictedbasedontheaveragedate.Thetotalshrinkageshorteningofthewallisthesumoftheshrinkagestrainsforeachconcretelifttimestheliftheight;however,theshrinkagestrainisdifferentforeachlift.Useofanaverageplacementdatefortheconcretetoestablishanaverageshrinkageforalltheliftsisareasonableandsufficientlyaccurateapproach.ResonsetouestionNo.3:ThecreepcurveofReference(6)ofthereportisincludedasAttachment2.Itwasusedtoestablishthespecificcreepvaluesdefinedinthereport.Independentcreeptests,werenotrec{uiredforGinnaandwere,therefore,notconducted.TheconcretemixdesignusedforthecontainmentwallisgivenintheresponsetoQuestion1.FortheGinnamix,thevolumeconcentrationofcementpasteintheconcreteis0.34,andthewater-cementratiobyweightis0.45.ForReference(6)thesevalueswere0.30and0.50,respectively.Becauseofthesimilarityofthetwomixes,thespecificcreepdataofReference(6)isconsideredapplicabletotheGinnaconcrete.ResonsetouestionNo.4:ThedesignbasisfortheGinnacontainmentwasACI318-63.Itdoesnotcontainarequirementtoproviderelaxationtestsforthetendonwires.Datausedwasprovidedbythetendonsupplierbasedontypicalwiresproducedatthattime.Asstatedinthereport,theprestressingwirewasspecifiedtohaveanominal40-yearstressrelaxationof12%.Figure3Aofthereport,isbasedonstress-relaxationcurvesfromArmcoSteelCorporation(SeeAttachment3),thesupplierofthewireforGinna.ThecurvesforSpecimens1and2wereprovidedbyArmcoasbeingrepresentativeoftherelaxationgradeofwireprovidedforGinna,butthespecimenswerenot.takenfromGinnaproductionwire.ThecurveinFigure3AofthereportwasconstructedbymultiplyingtherelaxationcurveforSpecimen2bythefactor(12/11.5).NotethatthecurveforSpecimen2includesdatafrom1000-hourrelaxationtests.

I' ROCHESTERGASANDELECTCCORP.DATEMay13,1980ToMr.DennisL.ZiemannSHEETNO.ResonsetouestionNo.5:Intheoriginaldesign,arequiredminimumaveragetendonforceof636kipswascalculated.Thisforceresultedfromthecontrollingloadcombination:where0.95D+F+1.5P+TaD=DeadloadF=VerticalprestressP=Accidentpressureof60psigT=Accidenttemperature,includingoperatingtemperatureaResonsetouestionNo.6:Theprinciplecauseofthelossoftendonprestressistherelaxationofthesteel.Theresultsofthetenyearretestin-dicatethat,whatappearedtobeanincreasedrateoflosswasinfactdiscrepanciesintheacousticlift-offreadingsforthe8yearsurveillance.Duringthetenyearretest.,avisualobserva-tionoftheeffectofcompletedetensioningontheconnectionbetweentherockanchorandthewalltendonwasmade.Noobserv-ablemovementoccurred(seepageI-3ofAddendum1ofthereport).Theeffectofdetensioningonetendon,ofatotalof160,ontheelastomericpadwasnot.addressedduringthetenyearretestsincethechangewouldhavebeentoosmalltoprovidereliabledata.ResonsetouestionNo.7:Theuseof1/32inchshimsratherthantheacousticalmethodtodeterminelift-offwasrecommendedbyInryco,Inc.,whosuppliedandstressedthetendonsandconductedthe10yearretestofthetendons.Alackofreproducibilityoflift-offreadingsonsomeprojects,asdemonstratedbythedifferencesbetweenthe8and10yearGinnatests,promptedachangetothisprocedure.NotefromTableI-1ofthereport,columns(1)and(2),thatthereisnotasignificantdifferenceinthelift-offpressuresusingthetwomethods.Theacousticmethodofdetermininglift-offishighlydependent.ontheindividualconductingthetestwhiletheabilitytoremovea1/32inchshimfromtheshimstackcanclearlybedemonstrated.ResonsetouestionNo.8:Aninspectionoftheconcretearoundthetendonanchorageshasnotbeenrequiredduringtendonsurveillance.Hence,docu-mentation,visualinspectionorphotographsarenotavailableforpastsurveillances.Theconcretesurroundingtherockanchorisinaccessibleandhasnotbeeninspected.

~'ROCHESTERGASANDELECTCORP.DATEMay.13.,1980ToMr.DennisF.ZiemannSHEETNO.5Question9isinseveralpartswhichwillberespondedtoasindividualquestions.ResonsetouestionNo.9a:Pages5.1.2-20,5.1.2-20a,and5.1.2-21oftheGinnaFSAR(SeeAttachment,2,part6ofthereport)givethedesignbasesfortherockanchorsandcontainthebasicreferencesusedtojustifythecriteria.ResonsetouestionNo.9b:Page5.1.2-23oftheGinnaFSAR(SeeAttachment2,part6ofthereport)indicatesthecapacitiesandsafetyfactorsfortheoriginaldesign.Reson'setouestionNo.9c:RGBrecordsindicatethatthetypicalrockanchorlengthis33'-6".Individualrecordsforeachtendonareavailableifdesired.ResonsetouestionNo.9d:Pages5.6.1-4through5.6.1-5oftheGinnaFSAR(SeeAttach-ment4)describethescaleddowntestsperformedtodeveloprockanchorcriteria.ResonsetouestionNo.9e:Page5.1.2-24oftheGinnaFSAR(SeeAttachment2,part6ofthereport)describesthetechnigueusedtoinstallthetendon/rockanchorcouplingdevice.Attachment5isanassemblydrawingofthetendontorockcoupling,andthemanufacturer'sdrawingsoftheindividualparts.ResonsetouestionNo.9f:Thedesignassumptiontoutilizetheweightoftherock(Seeresponsetoquestion9a)asthemaximumforcefortheanchortakesintoaccountalladverseeffectsofgroupactionsincethecapacityoftheanchorwasbasedon.8UTSor847kipswhichisalargerforce.Sincetherockanchorswerestressedto.8UTSduringinitialinstallation,newloadstobeappliedduringthere-tensioningprogramshouldhavenoadverseeffects.

eIWC ROCHESTERGASANDELECTCORP.DATEMay13,1980ToMr.DennisL.ZiemannSHEETNO.6Ifthereareanyfurtherquestionsregardingthisinformation,pleasecontact"us.Verytrulyyours,~MpLDW:rbAttachmentszc:Mr.BoyceH.Grier,DirectorOfficeofInspectionandEnforcementRegionIU.S.NuclearRegulatoryCommissionw/attachments t

Attachment1 Attachment2

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k7isn't'nPlanishrSOrp"/soHas/cCreepFor$000ps/Concrete.I7/rrieinYearsJdrrprrlps9rI'ozsoWoso~oOy//ortglo"=Joosooooorooorsoo7/'In2./nDa~IGiI(~lIsoooogyes.394~.55.e~4p.ae.dgc.dz~<ZP>U/6EaI20.0as~~a<%POpJTotalepee/i4Dcgs..~~~....,pars//uenemcTest's;agceIroadingtedasie;./Orilejr4V7/laoOfeePp/OP/japeppp)/ptDp5IirEs/'/mated/pasiccpaesj~/cu-/oadingages5etgudaysancp/2,3,+idglrtpon/hS./fcchnjbz4RupardR2/2,/IS.buss/CivilEnr/rnm.in'aboratary,seealsoAppend+8.~JFcmu!ajrrbxrjprrrrp:-".ri'"rrp.r~~r'jjrrjrrrP(rj,rri<.oronEPI,ApprmrjrA.'DCHVPACX55550CAt?8C055IILthG!I'Iht*CIRE.ptppppp5ap:ka015'P'PttDIZC Attachment3 PA re$Stroas-Rokam&,onCavesforNormalanl.fox-.Zntexmeliae'2)Q"5i,a.Lofti,raSpecimen;1LEQH~iRSpecime21nktial.Soecimen~TQk~5.T,oad+lr.sQ~\U~aU4tJClg123252.62)3,8259.2?>r8,0.Z683.68170<gyrag.66)6.660.660ll~.olidl1Aesroprosontactualdata.lins~rsregentGxtrqg>@ctrlcQyt;~.//nr@riantSpecime34VI/'pecimen4~~~rr~3.03.,000~10,000

~~1'IW TypeIIcement,modifiedforlowheatofhydration,isusedtominimizeshrinkage."Grab"samplesaretakenperiodicallyatthebatchplant,upondeliveryofcement.EachsampleistestedbytheTestingLaboratoryforconformanceto'ASTMC150,andtheresultsarealsocomparedwiththecertificatesupplywitheachdeliveryofcement.ElastometerBearinPadsTestsareperformedonelastomerspecimenstoensurecompliancewithrequirementsfor(1)originalphysicalpropertiesincludingtearresistance,hardness,tensilestrengthandultimateelongation,(2)changeinphysicalpropertiesduetooveraging,(3)extremetemperaturecharacteristics,(4)ozonecrackingresistance,(5)oilswelland(6)shearmodulus.Inaddition,twofullsize'padsaretested,oneforcreepandoneforultimateload.SpecimenNo.1isinitiallyplacedunderessentiallyaconstantcompressiveloadof1000psi(thedesignpressure)forfourdaystomeasurecreep.Thispadisthenloadedupto2000kips(5.3timesdesignload)whenthetestwasterminatedwithoutfailure.SpecimenNo.2wassimilarlyloadedupto2000kipswithoutfailure.Thereboundofthepadsafterthe2000kiploadwasremovedisessentiallycomplete.AsummaryofthetestresultsisshowninFigures5.6.13and5.6.1-4.RockAnchorTestsThreescaleddowntestrockanchorswereinstalledtodemonstratefirstthehold-downcapacityoftherockandsecondthecapacityofthebondbetweenrockandgrout.5.6.1-44/69 21Jk~'

Twotestsweremadeonrockanchor"A"whichwasinstalledatthecenteroftheproposedcontainmentvessel.Thefirsttest,calledtestA-1wastodeterminerockhold-downcapacity.Theset-upfortestA-1isillustratedinFigure5.6.1-5.Thebeamsupportpierswerelocatedbeyondtheassumedinfluencecircleofrockhavingadiameterof23feet6inches.Anindependentframewaserectedtoobtaindeflectionmeasurementson.theconcretepierat.theanchor.Thisplacedallsupportsforliftingaswellasmeasuringdevicesoutsidetheinfluencecircleofrock.Dialgaugeswereusedtomeasurethemovementoftheconcretepierandtheanchorhead.Thetestloadwasappliedwitha150tonjackmountedonthebeamsspanningthetestanchor.Measurementsofthejackingforceweremadewithadynamometer,calibratedimmediatelybeforethetest.Thesecondtestonrockanchor"A"(TestA-2)andthetestsonrockanchors"8"and"C",alsoinstallednearthecenteroftheproposedcontainmentvessel,weremadetodemonstratebondcapacity.Theset-upfortestA-2andforrockanchors"8"and"C"wasanarrangementwherebythejackwassupporteddirectlybytheconcretepieradjacenttothetestanchor.5.6.1-4a4/69 k~4F'I1IR1 Rockanchor"A"consistsoftwenty-eight1/4inchdiameterwiresgroutedforalengthof4feet5-1/2inchesina3-1/2inchdiameterhole.Alltestrockanchorswereoversizedsothatthetestloadof100kipswoulddeveloponlyabout30%oftheultimatecapacityoftendonwireswhiledevelopingabondstressof170psiwhichisthedesignstressforthecontainmentrockanchors.Thispermittedtestingbondstresseswellinexcessofdesign(170psi)withoutexceedingultimatewirestresses.ThetestprocedurefortestA-1wasasfollows:Theanchorwasloadedin20,000poundincrementsto100,000pounds.Theloadwasmaintainedateachincrementfor15minutespriortotakingmeasurementsforelongationofthetendonandclevationsoftheconcretepedestalandadjacentrocksurface.Becausetheanchorheadappearedfromvisualobservationtonothaveliftedoffatthe100,000poundload,theloadwasincreasedto110,000poundsatwhichpointliftoffwasapparent.Subsequentreviewofmeasurementsonthemovementoftheanchorheadindicatethatactualliftoffoccurredbetween80,000poundsand100,000poundsaswouldbeexpected.IntestA-2,"B"and"C",tendonwasjackedfromtheconcretepierimmediatelyadjacenttothetendon.Table5.6.1-1listsmeasurementstakenduringtestA-1.figures5.6.1-6,.5.6.1-7and5.6.1-8showplotsofloadvs.elongationdeflectionforalltests.Theapplicationofatestloadof110kipstorockanchor"A"(asindicatedbytheresultsoftestA-1shownonFigure5.6.1-6)isequivalentto137.5%ofthecalculatedhold-downcapacityassumptionusedinthedesignisvalid.Theplotofloadvs.elongationdeflectionforrockanchor"A"testsA-2(seeFigure5.6.1-6)and"B"and"C"(seeFigures5.6.1-7and5.6.1-8)indicateafactorofsafetyagainstslippagebythegroutandrockofatleast2.0(200kiploadvs.100kipdesignload)forrockanchor"B",.Ifslippageoccurredwithinthegroutthefactorofsafetyagainstfailureisevengreater.Theplotofloadvs.elongationforrockanchor"A"showsanapparentdis-continuitywhichisindicatedbyadashedlineonFigure5.6.1-6.ThisrepresentssettlementoftheconcretepieradjacenttotherockanchorwhentheloadwastransferredfromtheliftingframeusedintestA-1tothelocknutwhichbearsontheconcretepier.5.6.1-5 41lPW Attachment5 0P1-l Attachment85(Cont'd)Tfpr'c'a(WiieBush)'nygVyhfincr'ho7~@'-'8u'ffress77'!ar~nnc)",a'nnHeA'oc',A'nc47QRich/hanu'7hZ.75""88'uffrcss7hZlOizuO.7pprcnc'rr~eCoup()nyrVufer<'aliudSOa~S~r~f<-CZO<a~@shorb'raa'oterr~l:(zcygvzrsonp~.zggo-gI~ark]ng)or'ceEgj~c6'vrPres/ressForgegal+-14-TENDONTOROCKCOUPLINGFIG.5.1.2-12 4I,fV4E

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