ML17266A192

LER 80-016/09T-0:on 800411,engineering Evaluation Determined That Application of Two Rosemount Model 1152 Pressure Transmitters Resulted in Reportable Situation.Caused by Design Problem.Transmitters to Be Replaced

ML17266A192
Person / Time
Site:	Saint Lucie
Issue date:	04/16/1980
From:	SCHOPPMANN M A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17208A502	List: ML17208A501 ML17266A192
References
LER-80-016-09T, LER-80-16-9T, NUDOCS 8004240375
Download: ML17266A192 (3)

Text

II.0NRCPCRMSSSIT.TllCQNTACISLCCISJIU*NUCLKARRKQULATCAYCQhlMISSICNLICENSE="EVENTRCTIagy'IIIIIQI(PL~KPRINT'CATYI'%LLRKCVIRKQINI'CRMATICNI0,IUC%454%COOSI4'i5LIC1iNSSNVMSIIR4CQN'T~Q7SQUROS~XQK05IO0OI33IIOO40.47CCCXSTtiUMSSR6141KVKNTCKSCAIPTICNANCPRCBASLKCCNSKCUKNCKSQIODurinrefueinuonvendonojoo1J~QIZlr.lSSIll2I-'IIIIOLLA00SVStITOATSI,'KIIIQ9IS25LICSi45%TY7%J057CA~$40~a3seedeterminedthatthealicationoftwoRosemountNodtransmittersresulted.inareortablesituationT,S.5situationcouldresultintheoeninoftheContainmentVacuumReliefValveswithanoverpressureconditionincontainment.Assuminafailureofacheckvalveineachvacuumreliefline.containmentisolationcaa-~04bilitwould.beaffected.~.Thisisthefirsteventofthiste.IO7495YSTS>CAUS%CAUS%CQMr.YALYSCOOSCCQ%5V5CQOSCCMIrONSNTCOOSSVSCOOSSU%COOSSHII"'OL'JSLJS~~"SLESLOO'749I0III2I2~ISI910SSQVSNTIALQCCVRRStICSRSPORTRSVI5IQN<<R,RQQ~SNrY~"RSPORTNO.CQOS~TYSS~Na,8"'-"-"ILooI!ULJIIJJJIL~lLQJ2JK~ILJLl24ld2725JS203112AC4cNPUTURS=rrw.SNVTocwNATTACIIMSNTNANO&ARIM%CQMr.CQM7ONSNTTARSNAciTICVCNSpll'STIIOQ'OURSQ22SU%MITT%aPCRYI>ADJS.SvtrLIRMAN4PA~RSRL'sLJsL-"sL'-Is~LooLJSIls~s141l~.4041424447CAUSKQSCRIPTICNANQCQARKCiIVKACTIONSQ270Thetransmitterdenoutenormaunderthenormalrange.of-5to0inchesofwater.Thesetransmittersactuatethevacuumreliefvalvesat-2.25inchesofwater.Thelicenseewillreplacethesetransmitterswithadifferenttypebefore'start-up.MSTIIOOOrQISCOVSRVL~JQS4544444$75IIITISASRSCtINSLINJUN41Crq~o""bO'"'Lcs5arcROAMAOSwrsc:UTYQ~~YSS0%5CRISTION~Z'42741'0>VSLICrv,55USQ045cRlrr:cvQKKmN'0721I0'AMECPPRKPARKASchoccman149PACIU.v.STATUS5i1~SRQT7ISRSTATUSQSOOOLJS~l'S~741IOICIS44ACTIVITY~NT24rRSLSASSQarRSL445%'.AMQUNrQriCTIYITVQSSQSQ~ZQSsNA73910IIrSRSONNSL47IACSIJR%5vUMSSilTY,S04~lrnCaQ~LoOIoooiiQv~zlloiNALOCATIONarRSLSASSQSKNANANANANACIJSKCNl,V4$49(305)552-3802S004SSQ57~oldcavSRvOSSORIATIQN2VendorNot'ification20

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REPORTABLEOCCURRENCE33~-16LIGENSEEEVENTREPORTPAGETWOAdditionalEventDescritionandProbableConseuencesOnAprilll,1980,anengineeringevaluationdeterminedthattheappli-cationofcertainRosemountModel1152pressuretransmittersresultedinareportablesituation.Ithasbeenobservedbythemanufacturer,andreportedtothelicenseeonMarch15,1980thatina'imitednumberoftransmittersaninputpressureeitheroverorunderthenormaloperatingrangecausesanoutputwithinthenormalrangeof4to20milliamps.ThetransmittersaffectedareRosemountModel1152pressuretransmitterswithoutputcodes"A"or"D".Themanufacturerobservedthatduetoauniqueconditioninthetransmitterelectronics,anoverrangeconditionexceeding140%oftheupperrangelimitcancauseadiscontinuityinthetrans-mitteroutput,resultinginanoutputlessthan20millamps.Duetoadifferentuniqueconditioninthet'iansmitterelectronics,anunderrangeconditionexceeding100%ofthecalibratedspancancauseanoutputabove4milliamps.Theoverrangediscontinuitywasobservedin5%ofalimitedsample,theunderrangediscontiniutybeingobservedin55%ofthesample.ThemodeltransmitterinparallelwithasecondtransmitterfromadifferentmanufactureractuatesContainmentVacuumReliefValveFCV-25-7ononevacuumreliefline.AnidenticalcontrolarrangementexistsforContainmentVacuumReliefValveFCV-25-8onaredundantvacuum.reliefline.Thesevalvesalsoperform*containmereisolationfunctionintheeventofaLOCA.Eachcontainmentvacuumrelieflinecontainsacheckvalvetopreventflowoutfromthecontainment.Therangeoftheaffected.t=ansmittersis-5"H20to0"H20fora4to20milliampoutput.Withanoverpressureconditionexceeding140%ofthecalibratedspan,equivalenttoapositivepressureof2"H0incontainment,theRosemounttransmitterscouldopenvalvesFCV-25-7and3CV-25-8eventhoughthesecondtransmitterfunctionsproperly.Assumingafailureofthecheckvalve(s);containmentisolationcapabilitywouldbeaffected.Thismodel-transmitterisalsousedtomonitorreactorcoolantflow.Fourtransmittersmonitorthedifferentialpressureacrossthereactorcoolantpumpsandfourtransmittersmonitorthedifferentialpressureacrossthereactorcore.Thesetransmittersare"IndicationOnly"instrumentsandhavenocontrol,protective,orsafetyfunction.CorporatePowerPlantEngineeringhasdirectedthatthecontainmentvacuumrelieftransmittersbereplacedwithClass1E,SeismicCategoryIqualifiedRosemountModel1153pressuretransmitters.TheSt.LuciePlantMaintenanceDepartmentcoordinatedbyFP&LPowerResourcesDepartmentwillberesponsibleforthetransmitterreplacement.Thisactionisscheduledtobecompletedpriortothestart-upoftheunit(approximatelyApril30,1980).St.LucieUnit1hasbeenengagedinrefuelingsinceMarch15,1980.TheLicenseehasdeterminedthatitsotherlicensedfacilitiesarenotaffectedbythissituation,anditsEngineeringDepartmentwillensurethattheunitunderconstruction,St.LucieUnit2,willalsonotbeaffected.C