ML17212A406

Forwards Responses to NRC 810521 Request for Addl Info Re Auxiliary Feedwater Sys Automatic Initiation & Flow Indication.Four Oversize Drawings Encl.Aperture Cards Are Avaialable in PDR

ML17212A406
Person / Time
Site:	Saint Lucie
Issue date:	07/20/1981
From:	UHRIG R E FLORIDA POWER & LIGHT CO.
To:	CLARK R A Office of Nuclear Reactor Regulation
Shared Package
ML17212A408	List: ML17212A406 ML17212A409 ML17212A411 ML17212A413 ML17212A415
References
L-81-302, NUDOCS 8107280254
Download: ML17212A406 (15)

Text

REGULATORYORMATIONDISTRIBUTIONSYSi(RIDS)ACCESSIONNBR!8107280254DOCDDATE:"81/07/20NOTARIZED::NOFACILi:50335StsLuciePlant~Unit1<.FloridaPower8LightCo~AUTH'AME'UTHORAFFILIATIONUHRIGPR0E~FloridaPower8LightCo~RECIP~NAMElREC'IPIENTAFFILIA'TIONCIARKipR~ADOperating,ReactorsBranch3DOCKEiT¹05000335SUBJECTForwardsresponsestoNRC810521requestfor.addiinforeIauxiliaryfeedwaterisysautomatic-initiationLflowindication;Fouroversizedrawingsencl~Aperturecards'ill~beava.ilableinPDR,DISTRIBUTIONCODE1ADOISCOPIESRECEIVED;LTR'NCLA'IZE::gJTITLE':GeneralDistributionforafterIssuanceofOperatingLicenseNOTES:-RECIPIENTID'ODE/NAMEIACTION!ORB¹3BC'4INTERNAL'/DIREHUMFAC08ILEi06'ELD11TRAD'ASMTBRCOPIES"LTTRENCLL'3131122101~1RECIPIENTIDCODE'/NAME<<DIRgDIVOF.LIC.NRC-PDR02BR10G*FILE01COPIESLTTR'NCL<111=-.10,11EXTERNALt:=ACRSNSIC0905ie1611LPDRNTIS031111-TOTAL"NUMBER'FCOPIESREQUIRED:LTTR41ENCL"39 N'1a~1ca1't$IPEtf P.O.BOX529100MIAMI,FL33152Qilljj~FLORIDAPOWER&LIGHTCOMPANYJuly20,1981L-81-302OfficeofNuclearReactorRegulationAttention:Mr.RobertA.Clark,ChiefOperatingReactorsBranchIIl3DivisionofLicensingU.S.NuclearRegulatoryCommissionWashington,D.C.20555

DearMr.Clark:

Re:St.LucieUnitglDocketNo.50-335AuxiliaryFeedwaterSystemAutomaticInitiationandFlowIndicationFloridaPower8LighthasreviewedtheNRCletterdatedMay21,1981concerningtheabovesubjectandourresponseisattached.Verytrulyyours,RobertE.UhrigVicePresidentAdvancedSystems8TechnologyREU/PLP/rascc:Mr.J.P.O'Reilly,RegionIIHaroldF.Reis,Esquireyg,(gQgc,K~giA(8107280254810720PDRADOCK05000335PPDRPEOPI.E.~.SERVINGPEOPLE 0>,y'Pr.~a~J*4~s'P,pIl1,J'Fajttl REUESTFORADDITIONALINFOIQfATIONuestion1ST.LUCIE1AUXILIARYFEEDWATER(AFWAUTOMATICINITIATIONAND'FLOWINDICATIONPleaseprovidethefollowingdrawings:a)DetailedP&XD(PipingandInstrumentationDiagram)oftheSt.Lucie1auxiliaryfeedwatersystem(AFWS).b)Electricalschematics,,andlogicdiagramsfortheAFWSinitiationandannunciationcircuits,andAFWpumpandvalvecontrolcircuits.c)ElectricalschematicsforthevalvesinthesteamsupplylinetotheturbinedrivenAFWpump.Resonse1Thedrawingsrequestedbythestaffthatareattachedtothisletterarepreliminary.Thefinalizeddxawingsalongwiththeinformationthatisnotyetavailablewillbesenttoyouwhenthedesignisfinalized.DrawingsNumbersareasfollows:a)EbascoDwgNo.8770-G-080b)CombustionEngineeringDwgNo.E-00000-41l-801Rev01,AFASSimplifiedFunctionalDiagramE-00000-411-803RevOl,AFASTestingSystemDiagramE-00000-411-'04Rev01,AFASMiscellaneousDiagramSchematics>foractuatedcomponentswithchangesforAuxFeedwatexAutomaticInitiationSystem(CE)notavailableasofyet.c)Notavailableasofyet.uestion2AssumingalossofpowertotheAB-DCtiebus("A"batteryfailure),describethemanualactionsrequiredtotransferthisbustothe"B"battery-includingthetimerequiredtomakethistransfer.Resonse2Sincethe"AB"busisnormallyalignedtothe"B"batteryatSt.LuiceUnit1,theproceduretotransferthe"AB"busfromthe"B"batterytothe"A"batterywillbedescxibed.Theonlydifferencetotransferthe"AB"busfromthe"A"batterytothe"B"batterywouldbeachangeinthebreakernumbers.1.Checkthe1Achargeronthe1A125VDCbus,thelBchargeronthelB125VDCbus,andtheABchargeri.sinHotStandby.

2.CloseBreaker60317("AB"BatteryChargerOutput).3.OpenBreaker60316,tieto125VDCbus1Bon125VDCbus1ABfromthecontrolroom.OpenBreaker60230,tieto125VDCbus1ABon125VDCbus1Bfromthecontrolroom.5.CloseBreaker60130,tieto125VDCbuslABon125VDCbus1Afromthe'controlroom.6.CloseBreaker60315,tieto125VDCbus1Aon125VDCbus1ABfromthecontxolroom.Thetimerequiredtocarryoutthisprocedureisapproximatelytwo'togiyeminutes.uestion3ByFloridaPowerandLight(FP&L)letterdatedJanuary2,198l(L-81-4),,Enclosure2,itisstatedthat"TheASSwillautomaticallyterminateauxiliaryfeedwaterflowtoafaultedsteamgeneratorandautomaticallyprovideauxiliaryfeedwaterflowtotheintactsteamgenerator."Provideadetaileddescriptionofthisfeature(i.e.,automaticterminationofAFWtothefaultedsteamgenerator)includinglogicandschematicelectricaldiagrams.Resonse3Theauxiliaryfeedwateractuationsystemautomaticallyinitiatesauxiliaryfeedwatertotheintactsteamgeneratorupondemandandterminatesorpreventsauxiliaryfeedwatertothesteamgeneratoridentifiedasbeingruptured.TheAPASisafourchannelIEsystemthatprovidesseparatefeedwaterinitiationsignalsforeachsteamgenerator(identifiedasAFAS-1andAPAS-2).Bothsignalsareprovidedineachchanneltointerfacewiththeindividualcomponents(pumps,valves).Thelogicwhichisusedwithineachchanneltodefinefeedwaterinitiationorterminationisshowninfigure1.AFASisinitiatedwithineachchanneluponreceiptofalowS.G.waterlevelsignalprovidedthesteamgeneratororassociatedfeedwaterheaderisnotidentifiedasbeingruptured.Arupturesignalisgenerateduponthefollowingcondi.tions:S.G.pressureisapproximately100psibelowtheotherS.G.;orFeedwatersupplyheaderpressureisapproximately100psibelowtheotherfeedwatersupplyheaderpressure;andItsassociatedS.G.isidentifiedashavingalowwaterlevel,andTheotherS.G.orfeedwaterheaderisnotidentifiedasbeingruptured.Thelogicdiscussedaboveproducesadigital(on/off)signa1withineachchannelforAPAS1and2.Thesesignalsarecombinedacrossthefourchannelstoformatwo-out-offourlogic.ThislogicproducesanAFAS1or2actuationsignalwithineachchanneltocontrolthepumpsorvalvesassociatedwiththat.signal.Therefore,initiationofAPAS1or2willcausethefinalAFASactuationrelaystodeenergizetherebyenergizing lt I'rV;II'igurc1hl'ASLO(~ICIFIYII2I'SG1P1(P2PSG2,I,)fP2(P1P1~iP2LSG1LSG2P2<P1+f+]ORLOV(EVEI.LO'LYLEVEIOR)()I<07NOTnflDII~ti2/4~Off'JCMnfiUAL~OBf~l,$2/ilCOlfJCMANUALOllABBREVIATIONSP.PRESSURELLEVELSGSTEAI"IGENERATORF'tYIIFEED'VIATERHEAQFRAFASAUXILIARY~FEEDS'IATERACTUATIONSYSTI:iiAFAS1AFAS2',~~'l~\~~~t'I theassociatedpumpsandvalvestoprovidefeedwaterto-thhappropriateS.G.ShouldtheS.G.beidentifiedasbeingruptured,theAFASactuationrelayswouldreenergize(exceptpumpactuationrelays)andclosetheassociatedvalves.Forfurtherdetailoftheabovepxoject,seeCEdrawingE-00000-411-801(attached).uestion4ArethereanyoperatingbypassesassociatedwiththeAFWautomaticinitiationlogic/circuitryduringstart-uporoperationofthereactor?Ifso,howarethesebypassesremoved(automatically,procedurally,etc)?~Resense4TheAFAScontainstwotypesofbypasses,1)txipchannelbypassand2)batteryfailurebypass.Thetripchannelbypassisprovidedforperiodictestingofthesystemandtoremoveachannelfromsezviceduetoacomponentfailure.Thisbypassismanuallyinitiatedandmanuallyremoved.2)Thebatteryfailurebypassisanautomaticbypassinitiateduponlossofbatterypower.ThebypasseffectsonlychannelsAandB.LossofbatteryAwillautomaticallybypasschannelAonlyandsimilarlylossofbatteryBwillautomaticaliybypasschannelBonly.Individualmanualbypassswi.tcheswillbeprovidedonafunctiona1level(AFAS1andAFAS2)whichwillpreventtheindividualautomaticactuationoutputsfromoperatingAPWsystemcomponents(i.e.APAS1Abypass(S.G.1A,channelA),AFAS2B(bypass(S.G.1B,channelB)etc.).Acontrolroomannunciatorwillbeactuatedwhenanyoftheavailablebypassswitchesisputinthebypassposition.Thesebypasseswillberemovedmanuallyunderthedizectionofwrittenprocedures.uestion5DiscussthecapabilityfortestingandcalibrationoftheAPWautomaticinitiationchannelsincludingintervalsbetweentests.Resonse5Testingoftheauxiliaryfeedwatezactuationsystemisaccomplishedinfivesegments:1)SensorTest2)BistableTest3)LogicMatrixTest4)InitiationCircuitTest5)ActuationTestEachtestisdiscussedbelow:1)SensorTestDuringxeactoroperation,themeasurementchannelsprovidinganinputtotheAFASazecheckedbycomparingtheoutputsofsimilarchannelsandcross-checkingwithrelatedmeasurements.

Duringextendedshutdownperiodsorrefueling,thesemeasurementchannelsarecheckedandwherepossiblecalibratedagainstknownstandards.2)BistableTestTestingofthebistableisaccomplishedbymanuallyvaryingtheinputsignaluptoordowntothetripsetpointlevelononebistableatatimeandobservingthetripaction.Varyingtheinputsignalisaccomplishedbymeansofatriptestcircuitconsistipgofadigita1voltmeterandatestcircuitusedtovarythemagnitudeofthesignalsuppliedbythemeasurementchanneltothetripinput.Thetriptestcircuitisinterlockedelectricallysothatitcanbeusedinonlyonechannelatatime.Aswitchisprovidedtoselectthe.measurementchannel,andapush-buttonisprovidedtoapplythetestsignal.Thedigitalvoltmeterindicatesthevalueofthetestsignal.Tripaction(deenergizing)ofeachofthebistablerelaysisindicatedbyindividual1ightsonthefrontofthecabinet,indicatingthattheserelaysoperateasrequiredforabistabletripcondition.WhenoneofthebistablesoftheAFASisinthetrippedcondition,achanneltripexistsandisannunciated.Inthiscondition,auxiliaryfeedwouldtakeplaceonlyuponreceiptofaAFAS1orAFAS2tripsigna1inoneoftheotherliketripchannels.TheAFAS1orAFAS2tripchannelundertestisthereforebypassedforthistest.Fu11protectionismaintained.3)LoicMatrixTestThetestiscarriedouttoverifyproperoperationofthesix1ogicmatrices,anyofwhichcaninitiateasystemactuation.Onlythematrixrelaysinoneofthesixlogicmatricescanbeheldintheenergizedpositionduringtests.If,forexample,theAB1ogicmatrixholdpushbuttonisdepressed,actuationoftheothermatrixholdpush-buttonscanhavenoeffectupontheirrespectivelogicmatrices.Actuationofthepushbutton,appliesatestvoltagetothetestsystemholdcoilsoftheselecteddoublecoilmatrixrelays.Thisvoltageprovidesthepowernecessarytoholdtherelaysintheirenergizedpositionwhendeactuationofthebistablerelaycontactsinthematrixladderbeingtestedcausesdeenergizationoftheprimarymatrixrelaycoils.Thelogicmatrixtobe.testedisselectedusingtheSystemSelectswitch.WhileholdingthematrixHoldpushbuttoninitsactuatedposition,rotationoftheSystemSelectswitchreleasesonlythosebistablerelaysthathaveoperatingcontactsinthelogicmatrixundertest.TheSystemSelectswitchappliesatestvoltageofoppositepolaritytothebistablerelaytestcoils,sothatthemagneticfluxgeneratedbythesecoilsopposesthatoftheprimarycoiloftherelay.Theresultingfluxwillbezero,andtherelayswillrelease.AsimplifieddiagramofthistestingsystemisshownonC-EdrawingE-00000-411-803,(attached).TripactioncanbeobservedbyilluminationofthebistablerelayindicatorslocatedonthefrontpaneloftheAFAScabinetandbylossofvoltageto thefourmatrixrelays,whichisindicatedbyextinguishingindicatorlightsconnectedacrosseachmatrixrelaycoil.Duringthistest,thematrixrelay"hold"lightsremainon,indicatingthatatestvoltagehasbeenappliedtotheholdingcoilsofthematrixrelaysofthelogicmatrixmoduleundertest.Thetestisrepeatedforallsixmatrices.Thistestverifiesthatthe'bistablerelaycontactsoperatecorrectlyandthatthelogicmatrixrelayswilldeenergizeifthematrixcontinuityisviolated.Theopeningofthematrixrelaycontactistestedintheinitiationcircuittest.4)InitiationCircuitTestEachinitiationcircuitistestedindividuallybydepressingamatrixHoldpushbutton(holdingmatrixrelays),selectingeithersystempositionontheSystemSelectswitch(openingthematrix),andselectingamatrixrelayontheMatrixRelaySelectSwitch(deenergizingoneofthematrixrelays).Thiscausesone,andonlyone,oftheinitiationcircuitstodeenergize,causingonecurrentlegoftheselectivetwo-out,-of-fourineachchanneltoopen.LossofcurrentthroughthislegisindicatedontheAFAScabinet.TheMatrixRelaySelectSwitchisturnedtothenextposition,reenergizingthetestedmatrixrelay,allowingtheinitiationcircuittoxeenergize.Thissequenceisrepeatedfortheremainingthreeinitiationcircuitsfromtheselectedmatrix.Followingthis,theentiresequenceisrepeatedfortheremainingfivematrices.5)ActuationTestProperoperationoftheAFASrelaysintheAFASCabinet,isverifiedbydeenergizingtherelaysoneatatimeviaatestrelaycontactandnotingtheproperoperationofallactuatedcomponentsinthattripfunction(ASAS-1orAFAS-2).Therelaywillautomaticallyreenergizeandreturnitscomponentstothepretestconditionwhenthetestpushbuttonisreleased.Thedesignofthetestsystemisatatime.Thetestswitchmust(AFAS1orAFAS2)tobetested,impossible.ThetestcircuitisofaparticularAFASfunction.suchthatonlyonerelaymaybedeenergizedbepositionedtothefunctionrelaysselectionofmorethanonefunctioniselectricallylockedoutuponactuationTestingofsegments2thru5oftheAFASshouldbeaccomplishedatintervalssimilartotheRPS.uestion6AddressthephysicalseparationprovidedbetweentheredundantAFWautomaticinitiationinstrumentchannels.

Resonse6TheAFAScabinetisdividedintofrontandbackcompartmentsseparatedbyamechanicalbarrieratthe30"depthpoint.Additionalthermalandmechanicalbarriersinthehorizontalandvertica1planesatthecabinetcenterlinedividethecabinetintoeightseparatecompartments.Thefrontfourcompartmentscontaintheinitiationcircuitry(bistables,logic,andtestcircuitry)forchannelsA,B,CandDrespectivelyaswe11astheinterchannelisolationdevicestoanother.Accesstoeachfrontcompartmentiscontrolledbyaseparatetransparentdoorwithakeyswitch.M>erecablesofonecompartmentmustpassthroughtoanotheranenclosedcableduct(qualifiedasafirebarrier)isutilized.'ThefourrearcompartmentscontaintheactuationcircuitryanddevicesthatarerequiiedforcontroloftheAFASSystem.Hachcompartmenthasaseparatedoorforaccess.Mhereexistingplantinstrumentationsignals(e.g.,SteamGenerator'levelandpressure)aretobeusedbytheAFASinitiationsystem,theextensionofthese1oopstotheAFAScabinetwillbeinstalledwithappropriateseparationconsistentwiththeexisting1oopinstallations.Newdedicatedinstrumentationsignals(e.g.,Feedwaterheaderpressure)willbeinstalledwithseparationconsistentwithexistingplantseparationcriteria.Systemoutputsandoperatorinterfacedevices(switches)willalsobeinstalledinaccordancewithexistingplantseparationcriteria.uestion7DescribetheauxiliaryfeedwaterflowindicationinstrumentationattheSt.Lucieplant.Thisdescriptionshouldinclude:a.Typeandnumberofflowchannels.b.Thespecificsource(vitalbus)fromwhichthesechannelsarepowered.c.Capabilityfortestingandcalibrationincludingtheintervalbetweentests.d.Thetypeofindicationavailableinthecontrolroomforeachchannel(indicator,recorder,etc.)e.Safetygradequalificationoftheflowchannels.f.Accuracyoftheflowchannels.a.St.Lucie1hasthreeauxiliaryfeedwaterpumps.Eachpumpwithitsassociatedflowpathcontrolsandinstrumentationrepresentsseparatechannel.HeaderdischargeflowforeachchannelisindicatedonReactor-Turbine-GeneratorBoard(RTGB)andrecordedonPostAccidentPanelsAandB(PAP).ThechannelsaredesignatedasXA,XB,XAB(importantA,BorAB).Eachchannelrunsinseparatetraysystem.

b.Eachflowinstrumentationchannelispoweredfromsafetyrelatedsource.ChannelIAispoweredfromvitalbusSA,channelIBfromSBandchannelXA3fromSAB.VitalbusSA,SBtakespowerfromoffsitesourceandisbacked-upbyEmergencyDieselGenerator.VitalbusSABtakespowereitherfxomvitalbusSAorSB.c.Onepointpressurecheckisconductedonceamonthandresponseoftheinstrumentsisobserved.Instrumentsarecalibratedduringeachscheduledrefuelingoutage.Scheduled.outagesoccuratintervalsoftwelvetoeighteenmonths.Allinstrumentsintheloop;,arealsoxecalibratedeverytimethereisamalfunctionoraproblemintheloop.d.OneflowindicatorpereachchannelismountedonRTGB.AlsoeachchannelhasflowrecordermountedofPAP.ChannelIAandXABaremountedonPAP"A"andChannelMismountedonPAP".B";e.Flowinstrumentationchannelsareseismicallyqualified.ThisincludestransmittersaswellasequipmentmountedonRTGBandPAP.FlowinstrumentationequipmentmountedonRTGBorPAPislocatedonnon-safetyportionoftheboard.Thereisnotracabilityofmaterialsfoxauxiliaryfeedwaterflowinstrumentation.f~Flowtransmittersaccuracyis.5%atambienttemperatures.Accuracyofeachcomponentintheloopexceptprecisionresistorsis.5%.Accuracyofprecisionresistoris0.01%.Thecomponentoftheloopwhichhasaccuracyhigherthan0.5%isrejected.Overallaccuracyofeachflowloopistypically0.7%.uestion8DescribethesteamgeneratorlevelinstrumentationattheSt.Lucieplant.Thisdescriptionshouldinclude:a.Typeandnumberoflevelchannelspexsteamgeneratorincludingtherangefoxeachchannel.b.Thespecificsource(vitalbus)fromwhicheachofthesechannelsispowered.c.Capabilityfortestingandcalibrationincludingtheintervalbetweentests.d.Thespecificindicationavailableinthecontrolroomforeachchannel(indicator,recorder,etc.).Resonse8SteamGenexatorLevelInstrumentationisusedtoeffectreactortrip,automaticallyinitiateAuxiliaryFeedwatexSystemtotheintactsteamgeneratorandtomonitorsteamgeneratorlevelduringthecourseofanaccident.Steamgeneratorlevelinstrumentationisclassifiedintosafety relatedandnon-safetyinstrumentation.a.Thesafetyrelatedinstrumentationisdividedintofoursafetyrelatedprotectivechannels.Thechannelsaredesignated>fA,MB,MCandMD.Eachsteamgeneratorhasfourleveltransmittersrepresentingfourprotectivechannels.Protectivechannelsarenarrowrangetypeandareprimarilyusedtoinitiatereactortripandinitiateauxiliaryfeedwatertotheintactsteamgenerator.Lowsteamgeneratorlevelsignalwilltxipthexeactorwhenmeasuredsteamgeneratorlevelfallstoalowpresetva1iie.Thelogicissuchthatthecoincidenceoftwooutoffourlowlevelsignalsineithersteamgeneratorwilleffectreactortrip.ThesameleveltransmitterswhichtxipthereactorprovideaninputtoAuxiliaryFeedwaterInitiationSystem.Thelogicissuchthatthecoincidenceoftwooutoffourlowlevelsignalsineithersteamgeneratorwillinitiateauxiliaryfeedwaterflowtotheintactsteamgenerator.AllcomponentsofprotectivechannelsareClasslE.Eachprotectivechannelisindependentandseparatefromeachother.Cablesofthesamemeasuredparameterxuninseparateconduitortraysystem.InstrumentationofthesameprotectivechannelmountedonRTGBorPAPisisolatedfromotherchannelsandnon-safetyequipmentbyfireproofbarrier.Transmitterrangesforprotectivechannelsareasfollows:SG~TaNo.TransmRane1112222LT-9013ALT-9013BLT-9013CLT-9013DLT-9023ALT-9023BLT-9023CLT-9023D0-131.8"MC0-132.1"MC0-1318"MC0-131.7"MC0-131.7"MC0-131.8"MC0-131.8"MC0-131.8"MCInadditiontofourprotectivechannelseachsteamgeneratorisequippedwithonewiderangenon-safetychannelforindicationandrecording.ThesetransmittersareSeismicClassl.Transmitterrangesfoxwiderangetransmittersareasfollows:~TaNo.~RaaeLT-9012LT-9022483.8"QC-21.2"MC482.6"MC-20.1"MCThirdgroupofSGleveltransmittersarepartofFeedwaterRegulatingSystem.Twonon-safetySeismicClass1transmittersaxeprovidedforeachSG.ThesenarrowrangetransmittersprovideinputtothefeedwaterregulatingsystemsanddriveindicatingcontrollersandrecordersmountedonRTGB.

Thesetransmitterrangesareasfollows:SG~TaNo.~Rane212LT-9005LT-9006LT-9011LT-902161.2"WC63.7"WC1934"WC198.7"WC-192.9"WC-195.5"WC61.6"WC61.7"WCb.Eachprotectivechannelispoweredfrom120VACclass1Euninterxuptib16,=powersupplyofthesamechannel.PowersuppliesofchannelsMAandHCarepoweredfromBatteryAwhilechannelHBandMDaxepoweredfromBatteryB.Eachchannelispoweredthroughaninverter.Powersupplyofthesamechannelisisolatedfxomnon-safetyandsafetyrelatedequipmentofanotherchannel.c.Safetyxelatedinstrumentationiscalibratedduring:1-Sh'utd6wn2-Scheduledrefuelingoutage3-Whenmalfunctionorapxoblemoccursintheloop.Eachscheduledoutageoccursattimeintervalsoftwelvetoeighteenmonths.Asmentionedearlieraccuracyofeachcomponentintheloopexceptprecisionresistoris0.5%.Precisionresistoraccuracyis.01%.Componentisrejectedifitsaccuracyexceeds.5%duringcalibration.OverallaccuracyofeachSGsafetyrelatedinstrumentationloopistypically...7%.,Similarilycalibrationandaccuracyrequirementswillalsoapplytonon-safetyinstrumentation.Overallaccuracywillvaryslightlydependinghowmanycomponentsaxeintheloop.Typicallythereaxebetweenfouroxfivecomponentsinthe1oop.OverallaccuracyiscomputedusingSquareRootoftheSumoftheSquaxes(SRSS)method.d.FornarrowrangesafetyrelatedinstrumentationfourchannelsofindicatingcontrollersperSGaxemountedonRTGB(totalof8).AlsochannelIfA,foxSG1andSG2isrecordedonPAPA.Foxnon-safetywiderangelevelinstrumentationoneindicatorpera"".-SGislocatedonRTGBandHSCP.Onetwo-penrecordermountedonPA'P,recordschannelHAofSGlandSG2level.Fornon-safetynarrowrangeSGlevelinstrumentationusedforFeedwaterRegulatingSystemsonelevelindicatingcontrollerperSGisprovidedonRTGB.Alsoonetwo-penxecorderforrecordingSG1andSG2levelislocatedonPAP)att