ML17206A594: Difference between revisions

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==DearMr.Reid:==
==DearMr.Reid:==
Re:St.LucieUnit1DocketNo.50-335ResistanceTemeratureDetectorsOfficeofNuclearReactorRegulationAttention:Mr.R.W.Reid,ChiefOperatingReactorsBranchb4DivisionofOperatingU.S.NuclearRegulatoryCommissiWashington,D.C.20555ThislettergivesthestatusoftheFloridaPower&LightCompany(FPL)verificationprogramfortheLoop'urrentStepResponse(LCSR)techniqueofmeasuringResistanceTemperatureDetector(RTD)timeconstantsatSt.LucieUnitl.InJanuary,1978,thesurveillancerequiredbyTechnicalSpecification4.3.1.1.3wasperformedbyanFPLconsultantontheReactorProtectionSystem(RPS)ChannelARTD's.ThetestresultswerediscussedwithmembersoftheNRCstaffduringseveraltelephoneconversations.Asaresultofthediscussions,andinaccordancewithourletterL-78-180ofMay19,'978,availablespareRTD'swereinstalled(inMay)inplaceofthefourChannelARTD'sandweretestedbytheLCSRmethodduringthestartupofCycle2.InfurtherconformancewithourMay19letter,surveillancetestingofall16RTD'ssupplyinginputtotheRPSwasperformedinOctober,1978.Theresultsofthesetestsaretabulatedbelow:TimeConstantsecondsTaNo.Januar1978Ma1978*October1978TE-1112CATE-1112HAE-1122CAE-1122HAE-1112CBE-1112HBE-1122CBE-1122HBE-1112CCE-1112HCE-1122CCE-1122HCE-1112CDE-1112HDE-1122CDE-1122HD4.0+0.26.2+0.55.5+0.25.0+0.5*SareRTD'sin4.2+0.44.4+0.35.7+0.35.6+0.3stalledinChan4.0+0.44.4+0.26.0+0.65.3+0.55.0+0.55.0+0.95.9+0.35.8+0.34.5+0.75.4+0.45.4+0.35.4+0.44.8+0.34.9+0.55.7+0.54.3+0.5nelA~0~07901090/014PEOPLESERVINGPEOPLE  
Re:St.LucieUnit1DocketNo.50-335ResistanceTemeratureDetectorsOfficeofNuclearReactorRegulationAttention:Mr.R.W.Reid,ChiefOperatingReactorsBranchb4DivisionofOperatingU.S.NuclearRegulatoryCommissiWashington,D.C.20555ThislettergivesthestatusoftheFloridaPower&LightCompany(FPL)verificationprogramfortheLoop'urrentStepResponse(LCSR)techniqueofmeasuringResistanceTemperatureDetector(RTD)timeconstantsatSt.LucieUnitl.InJanuary,1978,thesurveillancerequiredbyTechnicalSpecification4.3.1.1.3wasperformedbyanFPLconsultantontheReactorProtectionSystem(RPS)ChannelARTD's.ThetestresultswerediscussedwithmembersoftheNRCstaffduringseveraltelephoneconversations.Asaresultofthediscussions,andinaccordancewithourletterL-78-180ofMay19,'978,availablespareRTD'swereinstalled(inMay)inplaceofthefourChannelARTD'sandweretestedbytheLCSRmethodduringthestartupofCycle2.InfurtherconformancewithourMay19letter,surveillancetestingofall16RTD'ssupplyinginputtotheRPSwasperformedinOctober,1978.Theresultsofthesetestsaretabulatedbelow:TimeConstantsecondsTaNo.Januar1978Ma1978*October1978TE-1112CATE-1112HAE-1122CAE-1122HAE-1112CBE-1112HBE-1122CBE-1122HBE-1112CCE-1112HCE-1122CCE-1122HCE-1112CDE-1112HDE-1122CDE-1122HD4.0+0.26.2+0.55.5+0.25.0+0.5*SareRTD'sin4.2+0.44.4+0.35.7+0.35.6+0.3stalledinChan4.0+0.44.4+0.26.0+0.65.3+0.55.0+0.55.0+0.95.9+0.35.8+0.34.5+0.75.4+0.45.4+0.35.4+0.44.8+0.34.9+0.55.7+0.54.3+0.5nelA~0~07901090/014PEOPLESERVINGPEOPLE  
)PY OfficeofNuclearReactor'RegulationPageTwoComparisonoftheMaytestresults(replacementsensors)withtheJanuarytestresults(originalsensors)showsanapparentimprovementinonlyoneofthefourtimeconstants.Comparis'onoftheOctobertestresultswiththeMaytestresultsindicatesthattherewasnosignificantchangeinthemeasuredtimeconstantsofthefourChannelAPTD'sduringthe5-monthintervalbetweentests.Insummary,theresultstodateofLCSRtestingatSt.LucieUnit1indicate:1)ThetimeconstantsoftheRPSRTD'sarealllessthanthe8.0secondlimitspecifiedbyTechnicalSpecificationTable3.3-2.2)Thereisnoevidenceofagenerictrendtowardincreasingtimeconstantsforthesesensors.Verytrulyyours,RobertE.UhrigVicePresidentAdvancedSystemsandTechnologyREU/MAS/cpccc:Mr.JamesP.O'Reilly,RegionIIHaroldF.Reis,Esquire 0  
)PY OfficeofNuclearReactor'RegulationPageTwoComparisonoftheMaytestresults(replacementsensors)withtheJanuarytestresults(originalsensors)showsanapparentimprovementinonlyoneofthefourtimeconstants.Comparis'onoftheOctobertestresultswiththeMaytestresultsindicatesthattherewasnosignificantchangeinthemeasuredtimeconstantsofthefourChannelAPTD'sduringthe5-monthintervalbetweentests.Insummary,theresultstodateofLCSRtestingatSt.LucieUnit1indicate:1)ThetimeconstantsoftheRPSRTD'sarealllessthanthe8.0secondlimitspecifiedbyTechnicalSpecificationTable3.3-2.2)Thereisnoevidenceofagenerictrendtowardincreasingtimeconstantsforthesesensors.Verytrulyyours,RobertE.UhrigVicePresidentAdvancedSystemsandTechnologyREU/MAS/cpccc:Mr.JamesP.O'Reilly,RegionIIHaroldF.Reis,Esquire 0}}
}}

Revision as of 19:15, 18 May 2018

Loop Current Step Response Tests to Date Indicate That Time Constants of Resistance Temp Detectors Are All Less than 8.0 Second Limit Specified by Tech Specs.No Evidence of Generic Trend to Increase Time Constants for Sensors
ML17206A594
Person / Time
Site: Saint Lucie NextEra Energy icon.png
Issue date: 01/03/1979
From: UHRIG R E
FLORIDA POWER & LIGHT CO.
To: REID R W
Office of Nuclear Reactor Regulation
References
L-79-2, NUDOCS 7901090199
Download: ML17206A594 (6)


Text

BEGULATQYINFOBNATIONDISTBIBUTIOIYSTEII(BIDS)ACCESSIONNBR-7901090.199DOC.DATE-79/01/03NOTARIZED-NOFACIL:50-335SAINTLUCIEOl,FLORIDAPOHER8LIGHTCO..AUTH.NAMEAUTHORAFFILIATIONUHRIG,R.F.FLORIDAPOWER8,LIGHTCO.RECIPENAMERECIPIENT-AFFILIATIONREID,B.W.'**OPERATINGREACTORSBRANCH4DOCKETPy05000335SUBJECT-LoopCurrentStepResponseteststodateindicatethattimeconstantsofRPSRTD'sarealllessthat8.0secondlimitspecifiedbyTechSpecTable3.3-2,8,thereisnoevidenceofgenerictrendtoincreasing,timeconstantsforsensors.DISTRIBUTIONCODE:A001SCOPIESRECEIVED-LTB+ENCL~SIZE:TITLE.-GENERALDISTRIBUTIONFOBAFTERISSUANCEOFOPERATINGLICNOTES-RECIPIENTIDCODE/NAME~ACTION:05BCNf/NA'QINTERNAL~15COREPEBFBB17ENGRBR19PLANTSYSBR21EFLTTRTSYSEXTERNAL-03LPDR23ACRSCOPIESLTTBENCL116IRECIPIENT,IDCODE/NAME02NRCPDR141.1ANAUER16ADSYS/PROJ18BEACSFTYBB'0EEB22BRINKMAN04NSICCOPIESLTTBENCLTOTALNUMBEROFCOPIESREAUIRED:LTTR38FNCL

'7t,hitln P.O.BOX5291004MIAMI,FL33152+>Ilia+FLORIDAPOWER&LIGHTCOMPANYJanuary3,1979L-79-2ReactorsongTO~~DD"'~t'.T

DearMr.Reid:

Re:St.LucieUnit1DocketNo.50-335ResistanceTemeratureDetectorsOfficeofNuclearReactorRegulationAttention:Mr.R.W.Reid,ChiefOperatingReactorsBranchb4DivisionofOperatingU.S.NuclearRegulatoryCommissiWashington,D.C.20555ThislettergivesthestatusoftheFloridaPower&LightCompany(FPL)verificationprogramfortheLoop'urrentStepResponse(LCSR)techniqueofmeasuringResistanceTemperatureDetector(RTD)timeconstantsatSt.LucieUnitl.InJanuary,1978,thesurveillancerequiredbyTechnicalSpecification4.3.1.1.3wasperformedbyanFPLconsultantontheReactorProtectionSystem(RPS)ChannelARTD's.ThetestresultswerediscussedwithmembersoftheNRCstaffduringseveraltelephoneconversations.Asaresultofthediscussions,andinaccordancewithourletterL-78-180ofMay19,'978,availablespareRTD'swereinstalled(inMay)inplaceofthefourChannelARTD'sandweretestedbytheLCSRmethodduringthestartupofCycle2.InfurtherconformancewithourMay19letter,surveillancetestingofall16RTD'ssupplyinginputtotheRPSwasperformedinOctober,1978.Theresultsofthesetestsaretabulatedbelow:TimeConstantsecondsTaNo.Januar1978Ma1978*October1978TE-1112CATE-1112HAE-1122CAE-1122HAE-1112CBE-1112HBE-1122CBE-1122HBE-1112CCE-1112HCE-1122CCE-1122HCE-1112CDE-1112HDE-1122CDE-1122HD4.0+0.26.2+0.55.5+0.25.0+0.5*SareRTD'sin4.2+0.44.4+0.35.7+0.35.6+0.3stalledinChan4.0+0.44.4+0.26.0+0.65.3+0.55.0+0.55.0+0.95.9+0.35.8+0.34.5+0.75.4+0.45.4+0.35.4+0.44.8+0.34.9+0.55.7+0.54.3+0.5nelA~0~07901090/014PEOPLESERVINGPEOPLE

)PY OfficeofNuclearReactor'RegulationPageTwoComparisonoftheMaytestresults(replacementsensors)withtheJanuarytestresults(originalsensors)showsanapparentimprovementinonlyoneofthefourtimeconstants.Comparis'onoftheOctobertestresultswiththeMaytestresultsindicatesthattherewasnosignificantchangeinthemeasuredtimeconstantsofthefourChannelAPTD'sduringthe5-monthintervalbetweentests.Insummary,theresultstodateofLCSRtestingatSt.LucieUnit1indicate:1)ThetimeconstantsoftheRPSRTD'sarealllessthanthe8.0secondlimitspecifiedbyTechnicalSpecificationTable3.3-2.2)Thereisnoevidenceofagenerictrendtowardincreasingtimeconstantsforthesesensors.Verytrulyyours,RobertE.UhrigVicePresidentAdvancedSystemsandTechnologyREU/MAS/cpccc:Mr.JamesP.O'Reilly,RegionIIHaroldF.Reis,Esquire 0