ML17265A312

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Provides More Detailed Description of Basis for Proposed Setpoint Language Contained in 970929 Application for Amend, Per 980428,0513 & 20 & 0603 Telcons W/Nrc Re Change to Main Steam Isolation Setpoint.Revised TS Pages Encl
ML17265A312
Person / Time
Site: Ginna Constellation icon.png
Issue date: 06/04/1998
From: MECREDY R C
ROCHESTER GAS & ELECTRIC CORP.
To: VISSING G S
NRC (Affiliation Not Assigned), NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML17265A313 List:
References
NUDOCS 9806100264
Download: ML17265A312 (15)


Text

CATEGORY1REGULATEINFORMATION DISTRIBUTIOh SYSTEM(RIDS)ACCESSION NBR:9806100264

'OC.DATE:

98/06/04NOTARIZED:

YESDOCKET¹FACIL:50-244 RobertEmmetGinnaNuclearPlant,Unit1,Rochester G05000244AUTH.NAME"AUTHORAFFILIATION MECREDY,R.C.

Rochester Gas8ElectricCorp.RECIP.NAME RECIPIENT AFFILIATION VISSING,G.S.

SUBJECT:

Providesmoredetaileddescription ofbasisforproposedsetpointlanguagecontained in970929application foramend,per980428,0513 R20R0603telconsw/NRCrechangetomainsteamisolation setpoint.Revised TSpagesencl.DISTRIBUTION CODE:A001DCOPIESRECEIVED:LTR ENCLSIZE:TITLE:ORSubmittal:

GeneralDistribution NOTES:License Expdateinaccordance with10CFR2,2.109(9/19/72)

.E05000244GRECIPIENT IDCODE/NAME PD1-1LAVISSING,G.

01EXTENOACINTERNAL:

ILECEDE/EMCBNRR/DSSA/SPLB NUDOCS-ABSTRACT COPIESLTTRENCL11111111111111RECIPIENT IDCODE/NAME PD1-1PDNRR/DE/ECGB/A NRR/DRCH/HICB NRR/DSSA/SRXB OGC/HDS3NRCPDRCOPIESLTTRENCL1111111110110D0ENNOTETOALL"RIDS"RECIPIENTS:

PLEASEHELPUSTOREDUCEWASTE.TOHAVEYOURNAMEORORGANIZATION REMOVEDFROMDISTRIBUTION LISTSORREDUCETHENUMBEROFCOPIESRECEIVEDBYYOUORYOURORGANIZATION, CONTACTTHEDOCUMENTCONTROLDESK(DCD)ONEXTENSION 415-2083TOTALNUMBEROFCOPIESREQUIRED:

LTTR13ENCL12 II1VP1rIll C3ANDROCHESTER GASANDELECTRICCORPORATION

~89EASTAVENLIE, ROCHESTER, N.Y14649-000I ARFACODE716546-270OROBERTC.MECREDYVicePresident NvdeorOperotions June4,1998U.S.NuclearRegulatory Commission DocumentControlDeskAttn:GuyS.VissingProjectDirectorate I-1Washington, D.C.20555

Subject:

MainSteamIsolation SetpointLicenseAmendment RequestRochester Gas&ElectricCorporation R.E.GinnaNuclearPowerPlantDocketNo.50-244

Reference:

(a)Letterfrom.R.C.

Mecredy,RG&E,toG.S.Vissing,NRC,

Subject:

Application forAmendment toI"acili(y Operating License,ChangetoMainSteamIsolation Setpoint(LCOTable3.3.2-l,Function4.d),datedSeptember 29,1997.(b)Conference callsofApril28,May13and20,andJune3,1998betweenRG&EandNRC.DearMr.VissingInReference (a),RG&Esubmitted aproposedchangetotheImprovedTechnical Specification (ITS)setpointformainsteamisolation (Table3.3.2-1,Function4.d).Recently, RG&EandtheNRCdiscussed thelanguagebeingproposedfortherevisedsetpointandwhythisdifferedfromStandardITS(Reference (b)).ThepurposeofthisletteristodescribeinmoredetailthebasisfortheproposedsetpointlanguageandtorevisetheproposedITSbasestoprovidefurtherclarification.

Thefollowing tableillustrates thedifferences betweentheRG&EproposedchangestoITSTable3.3.2-1,FunctionDandthoseinStandardITS:TripSetpoints0.4E6ibm/hr1005psig~GGdAllowable Values0.66E6ibm/hr1005psigStandardITSs[25%]offullsteamflowatnoloadsteampressures[]offullsteamfiowatnoloadsteampressure(s-'lA~P,

.9806i00264 980604'DR ADOCK05000244PPDR Ascanbeseen,theprimarydifferences are:(1)useofaspecificflowrateversusapercentage offullsteamflow,.and (2)useofaspecificpressureversus"noloadsteampressure."

Thesedifferences arediscussed indetailbelow.IAttachment Iprovidesasimplified figureofoneofthefourmainsteamflowinstrument loops.Ascanbeseenonthisfigure,FT-464isadifferential pressuretransmitter whosesignalissenttothreefunctions.

Thefirstsignalgoestomaincontrolboardindicator FI-464afterbeingcompensated bymainsteampressure(PM-464A) andprocessed byasquarerootextractor (FM-464B)andarepeater(FM-464C).

Thesecondsignalgoestoanalarm(FC-464A) andthentotwobistables forthehighsteamflowandhigh-high steamflowfunctions listedinITSTable3.3.2-1,Function4.Thethirdandlastsignalgoestoarepeater(FM-464D) andtotheadvanceddigitalfeedwater controlsystem(ADFCS).TheonlyoutputsignalfromFT-464whichispressurecompensated isthatforthemaincontrolboardindication.

Theoutputsignaltothehighandhigh-high steamflowbistables viaalarmFC-464Aisadirectvaluefromthedifferential pressuretransmitter.

However,thebistabletripsetpoints dohaveapressurecompensation "adjustment".

Thatis,thebistabletripsetpointmatchestheITSspecified conditions of0.4E6Ibm/hrN1005psig.Thisisaccomplished byidentifying therequiredsignaltomaincontrolboardindicator FI-464forsteamlineflow/pressure conditions of0.4E6Ibm/hr1005psig.ThissignalvalueistracedbackthroughthelogicshowninAttachment I(repeater, squarerootextractor, andsteampressuremultiplier) toidentifytherequiredoutputofthedifferential pressuretransmitter forFT-464.Thiscalculated outputsignalfromthedifferential pressuretransmitter iswhatisusedforthebistablesetpoint; hence,thepressurecompensation "adjustment".

Attachment IIprovidesadditional details.Asdescribed above,thebistablesetpoints arebasedonaspecificsetofplantsteamflowandpressureconditions.

Consequently, theGinnaStationITSmustspecifytheseplantconditions versustheStandardITStermsof"%fullsteamflow"and"noloadsteampressure" eventhoughtheGinnaspecified conditions areessentially equivalent totheStandardITSterms.Theaccidentanalysisalsousesthesesameplantconditions.

Thatis,forthoseanalyzedsteamlinebreaksrequiring automatic steamlineisolation, theaccidentanalysisassumesamainsteamisolation signalisgenerated immediately aibaasafetyinjection setpointisreached.Theanalysisisthenreviewedafterwards toensurethattheremaining coincident mainsteamisolation parameters listedinITSTable3.3.2-1arealsomet.Forthecaseofsmallsteamlinebreaks,theaccidentanalysisverifiesthatthemainsteamflowis>0.66E6Ibm/hrwithpressures1005psigpriortoreachingsafetyinjection setpoints.

Highersteamflowrates orlowerpressures wouldgenerateahigherdifferential pressureacrosstheflowtransmitter ensuringthatthebistablesetpointisreached.Sincenormalfullpowerconditions resultinsteamflowsandpressures ofapproximately 3.3ibm/hrand730psigrespectively, thebistables forITSTable3.3.2-1,Function4.darenormallytripped.Therefore, theuseofaspecificflowrateandpressureremainsconsistent withtheaccidentanalysisandreflectsthatthebistablesetpointdoesnotautomatically changeifsteamconditions weretochange.Assuch,theGinnaStationITSisdifferent fromStandardITSinimplementation, butnotinintent.

Thebasesoriginally submitted inReference (a)arerevisedinAttachment 3toprovidethisadditional discussion.

Thisreplacesinitsentirety, thebasesprovidedinAttachment IItoReference (a).Inaddition, basedondiscussions duringtheJune3,1998conference call,anissuewasidentified withrespecttothepresentation styleofITSTable3.3.2-1.Specifically, theTripSetpointcolumnofthistableisactuallyanominalsetpointvalue(withtolerance bands)whiletheAllowable Valuecolumnistheanalytical valueusedintheaccidentanalysis.

Whileconsistent withtheGinnaStationSetpointAnalysis, itdoesnotprovideaclearoperability setpoint.

Inordertoprovidethisclarification, RG&Eisreevaluating theformatandspecificcontentofITSTable3.3.2-1forinclusion inafutureLicenseAmendment Request.Veryyours,RobertC.MecredySubscribed andsworntobeforemeonthis+dayofJunei998.5NotaryPublicMARIEC.VILI.ENEUYE NotaryPublic,StateofNewYorkMonroeCountyMDF/100Commission ExpiresOctober31,19Attachments xc:U.S.NuclearRegulatory Commission Mr.GuyS.Vissing(MailStop14B2)PWRProjectDirectorate I-1Washington, DC20555U.S.NuclearRegulatory Commission RegionI475Allendale RoadKingofPrussia,PA19406GinnaSeniorResidentInspector If(I,4t,giII4~ItJit-.ttt'II Attachment IBlockDiagramofSteamFlowTransmitter Instrument LoopFT-464 4.0BlockDiagramandScopeofAnalysisRef;Precalculation Instrument ReviewChecklist BlockDiagramforSteamGenerator Instrument LoopF464.DISC.VERTVRI IVOEIfaWtSTMOHOVSE Mottt:SHII<<41ftFT~M444OMIItsTRAMDESCPWROSOSY454ISO'fOASORO MODEMIIOA(4HFM~54ACESC:VIAI,SCAI5WDI45DAVL41IIRHOIMf0:f0)OCR0MODELlOOPSW15>VDESC.ERV.IetaaIRAHSMTIER14<<ma<<IIHS OSO;FOMORO IIODIL'EIII<<HOI4EDESCIAAIPIERMFOfoxsoeoMODELMCR4HIPISSISL5'IM.PRESS.1050MA.0(400PSISDESC50RItXIRACIMfaFOXOOROMOCEL'NAR4H(

DESCRtftAI(RMf0.f0100ROMODEL440R4HFC454ADISCALARMMf0'OX00R0MODEL4150R4DHA MANSTEMIISO(ATERIHISTEAMFLOWAHOLO1AVO(~545DEC.FlOAMPPH(1044IRII5.5MPFII(45~IAAIMANSTEAMISOLA(CNHHOS1EAIIflOWFM454DE5CREIEAIERIMOfolteROMODEL'MR4HLEOEHO'EVCEMAYHOTAffECTlDOPACCURACY"DEVICEDVTfVTISHOTWITHNTHESCOPEOFAHALYSISSCOPES(RIHDARY MAINSTEAM F464BLOCKDIAGRAMSHEETIMSF464.(TWG Figure1EWR5126DesignAnalysisDAEE-92-089-21 Page11of52Revision~

Attachment IIPressureCompensation Evaluation

Rochester GasandElectricCorporation Inter-Office Correspondence May5,1997

SUBJECT:

HiandHi-HiSteamFlowSetpoints forSteamline Isolation LogicTO:MarkFlahertyNuclearSafetyandLicensing Theinstrument bistables whichprovidetheHiandHi-HiSteamFlowtripfunctions forMainSteamIsolation donotreceiveasteampressurecompensation.

signal,however,thesetpoints havebeenappropriately calculated andsettoaccountfortherequiredsteampressures specified intheGinnaTechnical Specifications.

TheHi-Histeamflowbistableissettotripat,asteamflowdifferential pressure(DP)of861.2inwcwhichcorresponds totheDPassociated withamainsteamflowof3.6MPPHat755psig(i.e.fullloadconditions) asrequiredby.theTechnical Specifications.

Refertotheattachedblockdiagramforanoverviewofthemethodology usedtodetermine theappropriate setpoints.

Similarmethodology using0.4MPPHsteamflowand1005psigS/Gpressureisusedtodetermine thecompensated HiSteamFlowbistabletripsetpoint.

Attachment RichardA.BakerTechnical SupportNuclearEngineering Services ROCHESTER GASANDELECTRICCORPION42~33ENGDEPT.STATION:TAtie%""'H4Wh~+

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Attachment IIIRevisedBases