ML17266A087

LER 79-022/03L-0 on 790627:during Periodic Surveillance, Testing Auxiliary Feedwater Pump Failed to Start.Cause Could Not Be Determined.Condensation in Steam Line May Have Delayed Starting Enough to Mislead Operator

ML17266A087
Person / Time
Site:	Saint Lucie
Issue date:	07/27/1979
From:	SCHOPPMAN M A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17206A944	List: ML17206A943 ML17266A087
References
LER-79-022-03L, LER-79-22-3L, NUDOCS 7908070505
Download: ML17266A087 (3)

Text

NRCFORM568P.TTl'LICE')SEE EVENTREPORTU.SNUCLEARRKCULATORY COMMISSION CONTROLSLCCX:IIII)QI)PIEASEPRINTCRTYPSALLRECUIREOINFOR7>>IATIONI 7I2I7I7I9REI>>CRTOA>>cSoecificatio re'IQl!!!I"-Q'~ltIIQ~Q1a9UCLVSEECQQEUCSHSErVMSERi59L.C<<VScTYDc<<OCON'TBZa"...;:m!0I~O$O61OOCICET'IUMSCIAa63VENTQ*TE1415EVENTOESCRIPTION ANODROSABLECONSSCUENCcS QIODuringeriodicsurveillance testinor~o337.2..2auxiliarfeedwateIIpumpwasalignedtothe"B"steamsu1.Thestea,~o5,ferredtothe"A"sideandtSubseuentlthesteamsupplywasreturnedtothe"B"sidetheumostartedandthesurveillance testperformed satisfactoril

.Thiswastheeihthoccur-~oarenceforthelCauxiliafe10155~OS"B"steamsupplycouldnotbedetermined atthetimeoftheoccurrence.

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~LSRIRQEVENTY<<ARREPORTHQ,COOSTYPEilo,Gi>>i>>3'3>>~79~~022~<<'OI~L~i~031Ta242$'31'329ACTIONCUTUPSEDPECT>>SHUTCQ93H ATTACHM'CHT VDRQ>>4PRIAIECcuD C4DCHc73TTAKENACTIONCNPLANTuETRQQHOVRS~22SV934ITTKO PCRMSVSSVDPUER4*NUDA>>URERLIONSMSLJS~!IrISLccMIS~I'G34<<5564O414243CAUS-OSSCPIPTION ANOCORRKCilVIS AEONSQToThecauseforthe1Cauxiliarfeedwaterumfailintostartfromthe-Laterpumpoperation indicates thatcondensation inthesteamsutt,vlinemahavedelavedthestartsufficientl toleadthebelievethepump,failedtostartwheninactualititwasstartin>>)'11LOSSQDCRQAMACQFACILITYQ43rYD'5CESCRIDTIQH

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6359305/552-3802 1a' Reportable Occurrence 335-79-22 LicenseeEventReportPaget>>oAdditional CauseDescritionandCorrective ActionDuringperiodicsurveillance testingthe1Cauxiliary feedwater pumpfailedtostartfromthe"B"steamsupply.Thepumpwasstartedsuccessfully fromthe"A"steamsupplyandthenstartedsuccess-fullyfromthe"B"steamsupply.Nocauseforthefailuretostartonthefirstattemptcouldbedetermined atthetimeofoccurrence.

Laterpumpoperation indicates thatthepumpmaynotactualljhavefailedtostart.On7-16-79duringoperatortrainingexercises the1Cauxiliary feedwater pumpwasstartedlocallyfromthe"B"steamsupplyheader.Anexcessive quantityofwaterwasobservedissuingfromtheturbineexhaust,andthepumpcameuptospeedatamuchslowerratethannormal.Furtherinvesti-gation'evealed thatarecentchangetooperating procedure 0700022changednormallyopenwarm-upvalvesV8384andV8385tonormallyclosedtoagreewiththesystemPand1D.'Closingthese,valvescreatedatrapforconden-sationbuild-upupstreamofthe"B"steamsupplyvalveMV08-13.Itisnowhypothesized thatthebuild-upofcondensation createdawaterturbineeffectinthefirstsecondsoftheattempted pumpstartwhichresultedinamuchslowerrateofacceleration.

Normally, thepumpreachesappcoximately 2000rpmin15-20secondsandwhentheoperatordidnotseeanyindication ofrpminthattimeframe,hemanuallytrippedthepump.Itisfeltthatthepu-..pwasslowlyaccelerating asthewaterwaspassingthroughtheturbineandthepumpwouldhavestartedhaditnotbeentrippedmanually.

Corrective actionistomaintainthevalvesinanormallyopenconfiguration underOP0010122.ReviewbytheFacilityReviewGrouphasdetermined thatmaintaining thevalvesopendoesnotjeopardize plantsafety.Engineering willberequested toverifytheFRG'sfindings.