ML20086J395

Telecopy AO 74-11:on 741004,RCIC Steam Line Drain Valve Failed to Close.Caused by Weld Bead.Rcic Sys Blocked to Permit Disassmbly of Valve & Investigation of Problem

ML20086J395
Person / Time
Site:	Peach Bottom, 05000000
Issue date:	10/04/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086J393	List: ML20086J391 ML20086J395 ML20086J403 ML20086J425
References
AO-74-11, NUDOCS 8401230636
Download: ML20086J395 (2)

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Iduttific: t f on of Occurr r:

n PCIC :,*.ca:.' line drain tve i nilure to clot.e.

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ConJit. ion, Prior to Ccc. renca:

Reactor was optrati: 'at approxintely 1% pwact td th prl ary coolant pre mure of 150 p::1<,.

PCIC oper. bili.ty tettir ', in picg er,u.

Dercrfptton of Occurrer:2:

Du r i r..; ut v( 111c.ce Lt<.ti-of tlm r,CIC cynt;i durfe" a pl.:nt otartup, the inner ECIC.;tc..a line dr ain valve (AO-3-13-3!.) inile'd to cloce.

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I'ecignation of Aprmat C.;une of Occurr: n:e:

t-Dicact.cubly of t!: 3 v 've Im, indicated t!'at a welu bnad cr.= ed the valve to jea in an optn ronition.

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.g-Analysic of Occurrcnce:

The ECIC t.ain stc:a If ne drain nyute.a In u;uipped with a drain pot' co m a

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steam trap and tuo nir oper;.t ed it,oL.t ion valven in cerf.ro.

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which car.ric'ises in ti.n r:ain ste<a line 10 posed thror'a tt:0 air 1

Q operated Isolat ion valves in series to the ruin conlen: er.

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theae it.ol.. tion valvea clo.e aut<

iticilly on PCIC initiation.

J Since only one valve vis af f ec t ed 1,y thin occurrence, ayatea nt 00 oo op: rabilIry vac not aficetd.

no N4 Correctivu Actica:

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The RCIC nynte a w.a ble.cked to permi t di ran:,+.bly of tha valve and i

inve titation of tha proble:3.

In accorchnce uith the Technical

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Spet ficationc, the ITCI was f *mdf a tely tested to prove operability

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Failure Data:

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failuct:. of this type have occurr( L s

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Very truly yours, t

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,7 if. T. Ullrich, Superintendent

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