ML17266A210

LER 80-027/09T-0:on 800514,during Shutdown for Maint,Nsss Notified Util That Partial Draining of RCS While in Mode 5 Is Condition That Has Not Been Analyzed for Boron Dilution Event.Procedures Revised to Increase Min Shutdown Margin

ML17266A210
Person / Time
Site:	Saint Lucie
Issue date:	05/21/1980
From:	SCHOPPMAN M A FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17208A673	List: ML17208A672 ML17266A210
References
REF-PT21-80-220-001 LER-80-027-09T, LER-80-27-9T, NUDOCS 8006030449
Download: ML17266A210 (2)

Text

NBCPOR941SsaITnILECENSEEEVENTREPORTU.SNUCLEARREGULATORYCC44MISSIONCQNTROISLCCXIIFELISILESI134LYCSNSSSCOOSEE'IQIIPLP~SPRINTCRTYPcALI.REQUIREDINPORAIATIONI5IQ011-1011901010I.I10Qi11IIIIIIQA~IQ14III2459,4si4M4iB~53'4922,fPP4052~453CCN40E~0'"-0..;;12Q0saialii9s9'Q~ZIsiQai51211!50Slccc)cei.'4UAlssRBa.32svsNTCATsryB~~BTCATS30=VEi4T'DESCRIPTION9NOPROS*EL.ECONSEQUENCESQIO)DurinshutdownformaintenancetheNSSSnotifiedFPthtoartialdrain-inoftheRCSwhileinNode5isaconditionthathasnotbeenanalzedfortheborondilutionevent.Reduced'RCS"volumewouldresultin~35aredictedtilmetocriticalit1essthantheassumedtimeeriodforoeratoractionassumintheT.S.minimumshutdownmarinoflAhoexistedattheonsetoftheevent.ThisisreportableunderT.S.6.9.1.8becauseapartialldrainedRCSislessconservativethananalzedinthe.FSAR.7305VSTS'ffCAUS%CAUS%C94MPVAI.V9CQQSCocaSU%COOSCCMPCNSNTCOOS'USQQSSUBCQOSLzZziiQzz~BQIz~AQ90zzziz1z2Qa~zQsa~zGa790Ih11IJ12191922SSOUSNTIAIOCC9IBB%94CSBSPCBTBSVISIOH212222IS21~529302132ACTIONPUTVBSSPP%C514UTCOVINATTACHMSNTNPAC44PBIAPSCQMPCQMPQHSNTTAIISNACTIQ'ICNPLA9'4rSISTI400~NOVAS+22SUSMITTSQPCBM%US.5VPPLISBMA'4VPAVBSBMGQMZQMZQLZJQLOO~O4lLYJQZNJQiZIQ0229991IPJ43$2$21404142JA31CAUSEDESCRIPTIONANOCORRECTIVEACTIQNSQ270InaccordancewithNSSSrecommendationrcreasetheminimumshutdownmarinfromlAhoto2Xhensures20min.timelasetocriticalitandtorecludeooeratinwicharinaumpswithaartialldrainedRCSinM005hieventofthiste.Itisalsoreortableunder10CFR1a9PACILITY.STATUS5PCVI%BMST44COOPOTNSBSTATUSQ20clscQVSBv~QSINAMEOBPRcPARER8OG603OEE.A.Schoman.iQQ>>>>Q~OI0I0Q~73101212ACTIVITYCONTCNTRKLILASSOCPBSL~PSAMOUNTOPA~iVITYQSS~I~~ZQ22~2'A'3910JAPSBSONNSLIXPOSVBSS~92~000'Qas~ZQZsINA293111212PSBSQNHSIINJUBI%20~0(l0QaaNAI39II12ICSSQPCailOAMAC290PACILITYQASCSSCBIPTICN~19~ZQ2NA233'0pvsLIcrv0i4IQ~NA3:0'~1CISCCVSBVCSSCBIPTIC942LCCATICNOPBSLSASSQSENA303030I'IRCI'SECNI.YSs5950p94QNc.3055523802 ReportableOccurrence335-80-27LicenseeEventReportPaeTwoAdditionalInformationl.Theapplicabilityofthisoccurrenceto.St.Luci.eUnit2andTurkeyPointUnits384isunderconsideration.2.ATechnicalSpecificationchangeisbeingpreparedtoaddressoperationinMode5withapartiallydrainedRCS3.EntryintoMode5isfromNodesrequiringhighershutdownmargins.Deliberatedilutionwouldbere'quiredtaa'chievetheminimumshutdownmarginspecifiedinTechnicalSpecificationsforNode5.ThehighershutdownmarginsinMode4and6andtheneedfordeliberatedilutiontoachievetheminimumNode5shutdownmarginmakesthiseventunlikely.