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:

c ll)"l0 FQ)), PACSL)ILK THY'l)ISSIO;)

'1'0 CAl)PI)Qf PHA!)PY)ti PARTAi3)l," nCC))R))3".)CE 335-80-25 I:)OPERA))LE tlslV)3'CPAQQ VALVE" I"e uo is to confirm e)te telepltotla Ttotif icntic'n.a'la vu rli~.tHC , doJicatod pllonc circuit a't 0343 an 5/12/80.During a planneJ secondary plaiit.'coisl Juwtt/de)iresstirization rar riir>n.".stcam seal rcPair, it was noted t')tat: t:ht tciain stoa<)ieader 4s.:<<l.iin 3 dcprossuriao follotsing.t)SIV c1oaure.Ar.a1".nut 3:15 P~tf on 5/l2s/80 investi~arion revealed that)sot)i:)SIV bypass valves were stucL itT tlirt'open'asiri.an.

The st-.z nl liarli valves--crc sheared and r)ic v.ilveo worn inoperable borh electrically nnJ...atlltal,ly t;lect:rical val z position inJicaticn in tho conrrcil r~".c."~liaJ s)ti: nt otic valve to)ici'siitit.'.

The ot:her was t:apped closed wir)tour.posi.t:inn indicaricn.

Since t)tc bypaa" valve is an int: gral.parr.oi i,ts rcspcctivc

!)SIU, t'e plant was not in full cct=pliancc stir)i'Recit$pec'~7 l 5 ()fSIV Qpershilikj)

~It shnuld he notad t)tat t'hese are 3 lite)i~sara iip.lines Ancl"ltattld Faigitificartt-saf ty i~f filets~1 larit s)ititdci'sn't'LQ cc oMc:st tsns<:cs-.=oner-'t ar.3:43 A)f this date.Xt appears that one valve was vis-'positioned dttring ttairttenancc ctiter secondary syst:en uart tip on 5/10/80 aiid t:li.s)taft shoarcd an thc at):ar when ir, was aporatccl fnz thc secondary sy t:ta;.t;sar.".;.tift.

An intsestightion is in progr~ss t:o dcaterciine the-asset cause of E)to rialfunction and final reiiu1ts including final carrecriva act:ion tsil.l)ic report:ed.

I'.H.)ht)ty, Plant Taper St.Lucie l'1ant goo>.5.-Q N/HRJ/cc c