ML20086K518

Telecopy AO 74-31:on 740601,HPCI Pump Discharge Valve MO-23-20 Failed.Caused by Sheared Valve Steam.Valve Stem Replaced & Valve Operability Verified

ML20086K518
Person / Time
Site:	Peach Bottom
Issue date:	06/03/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-74-31, NUDOCS 8401270184
Download: ML20086K518 (2)

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., 3. .. $. . . . Juno 3, 1974 .

Mr. James P. O'Bailly, Director' "D . .

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.Dubject: Abnor-.al Occurrence 24-Hour Notification .

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lConfiming c:y conversation with Mr. Phil Stohr, A.E.C. Region.1 Regulatory ' (w i.. 54.3

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Reference:

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Technical Specification 3 3.C.1 and Table 3 7 4 e, .. '. r.' ..s. - ' #y .o

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'i( TOccurrence Ihto: June 1, 19 4 G O.P J '.'.,. F ,- '."" .y

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, .16entification of Occurrence: 7::~ -

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,,' O.Tailure of EPCI pu=p diccharge valve (ID-23-20N , D.J: n ; .b . ' ?, ',c{

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Description of Occurrence: '

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".+ ' . J; .During a routine test of ce=ponents fed fro:n a cotor control center which

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'.;rcotraints, the EPCI'pu=p diceharge valv'e motor was observed to' operate .$@k .(.i

..Y'll,, uithout moving the shaft of the valve in or out. .The valve stem was

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designation of Apparent Cause of Occurrence: .

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.,'. .lInvestigatien and dic:.antling of the valvo indicated that the valve stem i.:.; i bad' thcared just above the point at which it connects to tho valve disc.

,}:,4 Additional investigation dicelosed that the limitorque operator torque i jsf' I

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, ., evitches were inoperable because of an accurulation of greane'in the bellows r

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g/,"vanherassemblyassociatedwiththetorqueswitchmechanic2. Apparently, k.

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o ru a. ., :the chaft had sheared since the motor van not de-energined by the torque '

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$,.,.n:.The '(the HICI 10 in inner EFCI pu=p =aticdischarge valve orgthisla nor:! ally ([MMin [!

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.so standby ready for auto initiaticn. ':he'faildo L :l TT p:galve therefore does not affect the operability'or the EICI?synts anO f.,c ghA4 o l:./.R.j-

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Tollowins investigation, a new vaNo ste

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,.a e...i.. operability verified. In o.rder to. prevent the. accumulation of denne ,,V mic@ *.

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, , "'; fin .the, bellows vacher cechanim, a grease bypaca line vas added to the ,

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. :, ' No previous failuron of this valva have been reported.

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