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.

i O 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:

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

- N o. steam trap and tuo nir oper;.t ed it,oL.t ion valven in cerf.ro. k'a t er =

% which car.ric'ises in ti.n r:ain ste<a line 10 posed thror'a tt:0 air 1 Qo operated Isolat ion valves in series to the ruin conlen: er. Both theae it.ol.. tion valvea clo .e aut< iticilly on PCIC initiation. J nt 00 Since only one valve vis af f ec t ed 1,y thin occurrence, ayatea oo op: rabilIry vac not aficetd. '

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om Correctivu Actica: ,

g 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 '-. , / . .

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

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Very truly yours, g t

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if. T. Ullrich, Superintendent '

, . Peach Ecttc; Atomic Po.ter Str. tion

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