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.SNUCLEARREGULATORY CC44MISSION CQNTROISLCCXIIFELISILESI134LYCSNSSSCOOSEE'IQIIPLP~SPRINTCRTYPcALI.REQUIREDINPORAIATIONI 5IQ011-1011901010I.I10Qi11IIIIIIQA~IQ14III2459,4si4M4iB~53'4922,fPP4052~453CCN40E~0'"-0..;;12Q0saialii9s9'Q~ZIsiQai51211!50Slccc)cei.'4UAlssR Ba.32svsNTCATsryB~~BTCATS 30=VEi4T'DESCRIPTION 9NOPROS*EL.E CONSEQUENCES QIO)Durinshutdownformaintenance theNSSSnotifiedFPthtoartialdrain-inoftheRCSwhileinNode5isacondition thathasnotbeenanalzedfortheborondilutionevent.Reduced'RCS"volume wouldresultin~35aredictedtilmetocriticalit1essthantheassumedtimeeriodforoeratoractionassumintheT.S.minimumshutdownmarinoflAhoexistedattheonsetoftheevent.Thisisreportable underT.S.6.9.1.8becauseapartialldrainedRCSislessconservative thananalzedinthe.FSAR.7305VSTS'ffCAUS%CAUS%C94MPVAI.V9CQQSCocaSU%COOSCCMPCNSNT COOS'USQQSSUBCQOSLzZziiQzz~BQIz~AQ90zzziz1z2Qa~zQsa~zGa790Ih11IJ12191922SSOUSNTIAI OCC9IBB%94CS BSPCBTBSVISIOH212222IS21~529302132ACTIONPUTVBSSPP%C514UTCOVIN ATTACHMSNT NPAC44PBIAPSCQMP CQMPQHSNT TAIISNACTIQ'ICNPLA9'4r SISTI400~NOVAS+22SUSMITTSQ PCBM%US.5VPPLISBMA'4VPAVBSBMGQMZQMZQLZJQLOO~O4lLYJQZNJQiZIQ0229991IPJ43$2$21404142JA31CAUSEDESCRIPTION ANOCORRECTIVE ACTIQNSQ270Inaccordance withNSSSrecommendation rcreasetheminimumshutdownmarinfromlAhoto2Xhensures20min.timelasetocriticalit andtorecludeooeratinwicharinaumpswithaartialldrainedRCSinM005hieventofthiste.Itisalsoreortableunder10CFR1a9PACILITY.

STATUS5PCVI%BMST44COOPOTNSBSTATUS Q20clscQVSBv

~QSINAMEOBPRcPARER8OG603OEE.A.Schoman.iQQ>>>>Q~OI0I0Q~73101212ACTIVITYCONTCNTRKLILASSO CPBSL~PSAMOUNTOPA~iVITYQSS~I~~ZQ22~2'A'3910JAPSBSONNSL IXPOSVBSS

~92~000'Qas~ZQZsINA293111212PSBSQNHSI INJUBI%20~0(l0QaaNAI39II12ICSSQPCailOAMAC290PACILITYQASCSSCBIPTICN

~19~ZQ2NA233'0pvsLIcrv0i4IQ~NA3:0'~1CISCCVSBV CSSCBIPTIC94 2LCCATICNOPBSLSASSQSENA303030I'IRCI'SECNI.YSs5950p94QNc.3055523802 Reportable Occurrence 335-80-27 LicenseeEventReportPaeTwoAdditional Information l.Theapplicability ofthisoccurrence to.St.Luci.eUnit2andTurkeyPointUnits384isunderconsideration.

2.ATechnical Specification changeisbeingpreparedtoaddressoperation inMode5withapartially drainedRCS3.EntryintoMode5isfromNodesrequiring highershutdownmargins.Deliberate dilutionwouldbere'quired taa'chievetheminimumshutdownmarginspecified inTechnical Specifications forNode5.ThehighershutdownmarginsinMode4and6andtheneedfordeliberate dilutiontoachievetheminimumNode5shutdownmarginmakesthiseventunlikely.