ML17266A204

RO 335-80-25:on 800512,during Planned Secondary Plant Cooldown/Depressurization for Turbine Steam Seal Repair, Main Steam Header Would Not Depressurize Following MSIV Closure.Apparently Caused by Mispositioned Valve

ML17266A204
Person / Time
Site:	Saint Lucie
Issue date:	05/12/1980
From:	WETHY C M FLORIDA POWER & LIGHT CO.
To:
References
982, NUDOCS 8005230377
Download: ML17266A204 (1)

Text

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SUBJECT:

cll)"l0FQ)),PACSL)ILK THY'l)ISSIO;)

'1'0CAl)PI)Qf PHA!)PY)tiPARTAi3)l,"nCC))R))3".)CE 335-80-25 I:)OPERA))LE tlslV)3'CPAQQVALVE"I"euoistoconfirme)tetelepltotla Ttotificntic'n.a'lavurli~.tHC,doJicatod pllonccircuita't0343an5/12/80.DuringaplanneJsecondary plaiit.'coislJuwtt/de)iresstirization rarriir>n.".stcamsealrcPair,itwasnotedt')tat:t:httciainstoa<)ieader4s.:<<l.iin3dcprossuriao follotsing

.t)SIVc1oaure.Ar.a1".nut3:15P~tfon5/l2s/80investi~arion revealedthat)sot)i:)SIV bypassvalveswerestucLitTtlirt'open'asiri.an.

Thest-.znlliarlivalves--crcshearedandr)icv.ilveoworninoperable borhelectrically nnJ...atlltal,ly t;lect:rical valzpositioninJicaticn inthoconrrcilr~".c."~liaJs)ti:ntoticvalveto)ici'siitit.'.

Theot:herwast:appedclosedwir)tour.

posi.t:inn indicaricn.

Sincet)tcbypaa"valveisanint:gral.parr.oii,tsrcspcctivc

!)SIU,t'eplantwasnotinfullcct=pliancc stir)i'Recit$pec'~7l5()fSIVQpershilikj)

~Itshnuldhenotadt)tatt'heseare3lite)i~saraiip.linesAncl"ltattldFaigitificartt-saf tyi~ffilets~1larits)ititdci'sn't'LQ ccoMc:sttsns<:cs-.=oner-'t ar.3:43A)fthisdate.Xtappearsthatonevalvewasvis-'positioned dttringttairttenancc ctitersecondary syst:enuarttipon5/10/80aiidt:li.s)taftshoarcdanthcat):arwhenir,wasaporatccl fnzthcsecondary syt:ta;.t;sar.".;.tift.

Anintsestightion isinprogr~sst:odcaterciine the-asset causeofE)torialfunction andfinalreiiu1tsincluding finalcarrecriva act:iontsil.l)icreport:ed.

I'.H.)ht)ty,PlantTaperSt.Luciel'1antgoo>.5.-QN/HRJ/ccc