ML17206A594

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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