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{{#Wiki_filter:BEGULATQY INFOBNATION DISTBIBUTIOIYSTEII (BIDS)ACCESSION NBR-7901090.1 99DOC.DATE-79/01/03NOTARIZED-NOFACIL:50-335 SAINTLUCIEOl,FLORIDAPOHER8LIGHTCO..AUTH.NAMEAUTHORAFFILIATION UHRIG,R.F.
{{#Wiki_filter:BEGULATQY INFOBNATION DISTBIBUTIOIYSTEII (BIDS)ACCESSION NBR-7901090.1 99 DOC.DATE-79/01/03 NOTARIZED-NO FACIL:50-335 SAINT LUCIE Ol, FLORIDA POHER 8 LIGHT CO..AUTH.NAME AUTHOR AFFILIATION UHRIG,R.F.
FLORIDAPOWER8,LIGHTCO.RECIPENAMERECIPIENT-AFFILIATION REID,B.W.'**OPERATING REACTORSBRANCH4DOCKETPy05000335SUBJECT-LoopCurrentStepResponseteststodateindicatethattimeconstants ofRPSRTD'sarealllessthat8.0secondlimitspecified byTechSpecTable3.3-2,8,thereisnoevidenceofgenerictrendtoincreasing, timeconstants forsensors.DISTRIBUTION CODE:A001SCOPIESRECEIVED-LTB
FLORIDA POWER 8, LIGHT CO.RECIPE NAME RECIPIENT-AFFILIATION REID, B.W.'**OPERATING REACTORS BRANCH 4 DOCKET Py 05000335SUBJECT-Loop Current Step Response tests to date indicate that time constants of RPS RTD's are all less that 8.0 second limit specified by Tech Spec Table 3.3-2, 8, there is no evidence of generic trend to increasing, time constants for sensors.DISTRIBUTION CODE: A001S COPIES RECEIVED-LTB
+ENCL~SIZE:TITLE.-GENERALDISTRIBUTION FOBAFTERISSUANCEOFOPERATING LICNOTES-RECIPIENT IDCODE/NAME
+ENCL~SIZE:TITLE.-GENERAL DISTRIBUTION FOB AFTER ISSUANCE OF OPERATING LICNOTES-RECIPIENT ID CODE/NAME~ACTION: 05 BC Nf/NA'Q I NTERNAL~15 CORE PEBF BB 17 ENGR BR19 PLANT SYS BR 21 EFLT TRT SYSEXTERNAL-03 LPDR 23 ACRS COPIES LTTB ENCL 1 16 I REC I PI ENT, ID CODE/NAME 02 NRC PDR 14 1.1ANAUER 16 AD SYS/PROJ 18 BEAC SFTY BB'0 EEB 22 B R INKMAN 04 NSIC COPIES LTTB ENCL TOTAL NUMBER OF COP I ES REAUI RED: LTTR 38 FNCL
~ACTION:05BCNf/NA'QINTERNAL~15COREPEBFBB17ENGRBR19PLANTSYSBR21EFLTTRTSYSEXTERNAL-03LPDR23ACRSCOPIESLTTBENCL116IRECIPIENT,IDCODE/NAME 02NRCPDR141.1ANAUER 16ADSYS/PROJ18BEACSFTYBB'0EEB22BRINKMAN04NSICCOPIESLTTBENCLTOTALNUMBEROFCOPIESREAUIRED:LTTR38FNCL
'7 t, h i tl n P.O.BOX 5291004 MIAMI, FL 33152+>Ilia+FLORIDA POWER&LIGHT COMPANY January 3, 1979 L-79-2 Reactors on gTO~~DD"'~t'.T  
'7t,hitln P.O.BOX5291004MIAMI,FL33152+>Ilia+FLORIDAPOWER&LIGHTCOMPANYJanuary3,1979L-79-2ReactorsongTO~~DD"'~t'.T


==DearMr.Reid:==
==Dear Mr.Reid:==
Re:St.LucieUnit1DocketNo.50-335Resistance TemeratureDetectors OfficeofNuclearReactorRegulation Attention:
Re: St.Lucie Unit 1 Docket No.50-335 Resistance Tem erature Detectors Office of Nuclear Reactor Regulation Attention:
Mr.R.W.Reid,ChiefOperating ReactorsBranchb4DivisionofOperating U.S.NuclearRegulatory CommissiWashington, D.C.20555ThislettergivesthestatusoftheFloridaPower&LightCompany(FPL)verificationprogramfortheLoop'urrent StepResponse(LCSR)technique ofmeasuring Resistance Temperature Detector(RTD)timeconstants atSt.LucieUnitl.InJanuary,1978,thesurveillance requiredbyTechnical Specification 4.3.1.1.3 wasperformed byanFPLconsultant ontheReactorProtection System(RPS)ChannelARTD's.Thetestresultswerediscussed withmembersoftheNRCstaffduringseveraltelephone conversations.
Mr.R.W.Reid, Chief Operating Reactors Branch b4 Division of Operating U.S.Nuclear Regulatory Commissi Washington, D.C.20555 This letter gives the status of the Florida Power&Light Company (FPL)veri fication program for the Loop'urrent Step Response (LCSR)technique of measuring Resistance Temperature Detector (RTD)time constants at St.Lucie Unit l.In January, 1978, the surveillance required by Technical Specification 4.3.1.1.3 was performed by an FPL consultant on the Reactor Protection System (RPS)Channel A RTD's.The test results were discussed with members of the NRC staff during several telephone conversations.
Asaresultofthediscussions, andinaccordance withourletterL-78-180ofMay19,'978,available spareRTD'swereinstalled (inMay)inplaceofthefourChannelARTD'sandweretestedbytheLCSRmethodduringthestartupofCycle2.Infurtherconformance withourMay19letter,surveillance testingofall16RTD'ssupplying inputtotheRPSwasperformed inOctober,1978.Theresultsofthesetestsaretabulated below:TimeConstantsecondsTaNo.Januar1978Ma1978*October1978TE-1112CA TE-1112HA E-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
As a result of the discussions, and in accordance with our letter L-78-180 of May 19,'978, available spare RTD's were installed (in May)in place of the four Channel A RTD's and were tested by the LCSR method during the startup of Cycle 2.In further conformance with our May 19 letter, surveillance testing of all 16 RTD's supplying input to the RPS was performed in October, 1978.The results of these tests are tabulated below: Time Constant seconds Ta No.Januar 1978 Ma 1978*October 1978 TE-1112CA TE-1112HA E-1122CA E-1122HA E-1112CB E-1112HB E-1122CB E-1122HB E-1112CC E-1112HC E-1122CC E-1122HC E-1112CD E-1112HD E-1122CD E-1122HD 4.0+0.2 6.2+0.5 5.5+0.2 5.0+0.5*S are RTD's in 4.2+0.4 4.4+0.3 5.7+0.3 5.6+0.3 stalled in Chan 4.0+0.4 4.4+0.2 6.0+0.6 5.3+0.5 5.0+0.5 5.0+0.9 5.9+0.3 5.8+0.3 4.5+0.7 5.4+0.4 5.4+0.3 5.4+0.4 4.8+0.3 4.9+0.5 5.7+0.5 4.3+0.5 nel A~0~0 7901090/014 PEOPLE SERVING PEOPLE
)PY OfficeofNuclearReactor'Regulation PageTwoComparison oftheMaytestresults(replacement sensors)withtheJanuarytestresults(original sensors)showsanapparentimprovement inonlyoneofthefourtimeconstants.
)P Y Office of Nuclear Reactor'Regulation Page Two Comparison of the May test results (replacement sensors)with the January test results (original sensors)shows an apparent improvement in only one of the four time constants.
Comparis'on oftheOctobertestresultswiththeMaytestresultsindicates thattherewasnosignificant changeinthemeasuredtimeconstants ofthefourChannelAPTD'sduringthe5-monthintervalbetweentests.Insummary,theresultstodateofLCSRtestingatSt.LucieUnit1indicate:1)Thetimeconstants oftheRPSRTD'sarealllessthanthe8.0secondlimitspecified byTechnical Specification Table3.3-2.2)Thereisnoevidenceofagenerictrendtowardincreasing timeconstants forthesesensors.Verytrulyyours,RobertE.UhrigVicePresident AdvancedSystemsandTechnology REU/MAS/cpc cc:Mr.JamesP.O'Reilly,RegionIIHaroldF.Reis,Esquire 0}}
Comparis'on of the October test results with the May test results indicates that there was no significant change in the measured time constants of the four Channel A PTD's during the 5-month interval between tests.In summary, the results to date of LCSR testing at St.Lucie Unit 1 indi cate: 1)The time constants of the RPS RTD's are all less than the 8.0 second limit specified by Technical Specification Table 3.3-2.2)There is no evidence of a generic trend toward increasing time constants for these sensors.Very truly yours, Robert E.Uhrig Vice President Advanced Systems and Technology REU/MAS/cpc cc: Mr.James P.O'Rei lly, Region II Harold F.Reis, Esquire 0}}

Revision as of 19:42, 7 July 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)
v • d • e


Text

BEGULATQY INFOBNATION DISTBIBUTIOIYSTEII (BIDS)ACCESSION NBR-7901090.1 99 DOC.DATE-79/01/03 NOTARIZED-NO FACIL:50-335 SAINT LUCIE Ol, FLORIDA POHER 8 LIGHT CO..AUTH.NAME AUTHOR AFFILIATION UHRIG,R.F.

FLORIDA POWER 8, LIGHT CO.RECIPE NAME RECIPIENT-AFFILIATION REID, B.W.'**OPERATING REACTORS BRANCH 4 DOCKET Py 05000335SUBJECT-Loop Current Step Response tests to date indicate that time constants of RPS RTD's are all less that 8.0 second limit specified by Tech Spec Table 3.3-2, 8, there is no evidence of generic trend to increasing, time constants for sensors.DISTRIBUTION CODE: A001S COPIES RECEIVED-LTB

+ENCL~SIZE:TITLE.-GENERAL DISTRIBUTION FOB AFTER ISSUANCE OF OPERATING LICNOTES-RECIPIENT ID CODE/NAME~ACTION: 05 BC Nf/NA'Q I NTERNAL~15 CORE PEBF BB 17 ENGR BR19 PLANT SYS BR 21 EFLT TRT SYSEXTERNAL-03 LPDR 23 ACRS COPIES LTTB ENCL 1 16 I REC I PI ENT, ID CODE/NAME 02 NRC PDR 14 1.1ANAUER 16 AD SYS/PROJ 18 BEAC SFTY BB'0 EEB 22 B R INKMAN 04 NSIC COPIES LTTB ENCL TOTAL NUMBER OF COP I ES REAUI RED: LTTR 38 FNCL

'7 t, h i tl n P.O.BOX 5291004 MIAMI, FL 33152+>Ilia+FLORIDA POWER&LIGHT COMPANY January 3, 1979 L-79-2 Reactors on gTO~~DD"'~t'.T

Dear Mr.Reid:

Re: St.Lucie Unit 1 Docket No.50-335 Resistance Tem erature Detectors Office of Nuclear Reactor Regulation Attention:

Mr.R.W.Reid, Chief Operating Reactors Branch b4 Division of Operating U.S.Nuclear Regulatory Commissi Washington, D.C.20555 This letter gives the status of the Florida Power&Light Company (FPL)veri fication program for the Loop'urrent Step Response (LCSR)technique of measuring Resistance Temperature Detector (RTD)time constants at St.Lucie Unit l.In January, 1978, the surveillance required by Technical Specification 4.3.1.1.3 was performed by an FPL consultant on the Reactor Protection System (RPS)Channel A RTD's.The test results were discussed with members of the NRC staff during several telephone conversations.

As a result of the discussions, and in accordance with our letter L-78-180 of May 19,'978, available spare RTD's were installed (in May)in place of the four Channel A RTD's and were tested by the LCSR method during the startup of Cycle 2.In further conformance with our May 19 letter, surveillance testing of all 16 RTD's supplying input to the RPS was performed in October, 1978.The results of these tests are tabulated below: Time Constant seconds Ta No.Januar 1978 Ma 1978*October 1978 TE-1112CA TE-1112HA E-1122CA E-1122HA E-1112CB E-1112HB E-1122CB E-1122HB E-1112CC E-1112HC E-1122CC E-1122HC E-1112CD E-1112HD E-1122CD E-1122HD 4.0+0.2 6.2+0.5 5.5+0.2 5.0+0.5*S are RTD's in 4.2+0.4 4.4+0.3 5.7+0.3 5.6+0.3 stalled in Chan 4.0+0.4 4.4+0.2 6.0+0.6 5.3+0.5 5.0+0.5 5.0+0.9 5.9+0.3 5.8+0.3 4.5+0.7 5.4+0.4 5.4+0.3 5.4+0.4 4.8+0.3 4.9+0.5 5.7+0.5 4.3+0.5 nel A~0~0 7901090/014 PEOPLE SERVING PEOPLE

)P Y Office of Nuclear Reactor'Regulation Page Two Comparison of the May test results (replacement sensors)with the January test results (original sensors)shows an apparent improvement in only one of the four time constants.

Comparis'on of the October test results with the May test results indicates that there was no significant change in the measured time constants of the four Channel A PTD's during the 5-month interval between tests.In summary, the results to date of LCSR testing at St.Lucie Unit 1 indi cate: 1)The time constants of the RPS RTD's are all less than the 8.0 second limit specified by Technical Specification Table 3.3-2.2)There is no evidence of a generic trend toward increasing time constants for these sensors.Very truly yours, Robert E.Uhrig Vice President Advanced Systems and Technology REU/MAS/cpc cc: Mr.James P.O'Rei lly, Region II Harold F.Reis, Esquire 0

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