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 FLORIDA POWER & LIGHT CO.
To:
References
982, NUDOCS 8005230377
Download: ML17266A204 (1)

Text

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SUBJECT:

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 Ttotificntic'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.".

it stcam seal rcPair, 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' It shnuld he notad i~f t)tat t'hese are 3 lite)i ~sara iip .lines Ancl "ltattld

~ 7 l 5 ()fSIV Qpershilikj) ~

Faigitificartt-saf ty filets 1 larit s)ititdci'sn't'LQ cc oMc:st tsns <:cs-.=oner-'t

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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.

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