ML20086K979

Telecopy AO 74-25:on 740512,containment Isolation Ball Valve for Traversing in-core Probe Machine 4 Failed to Shut.Caused by Sticking or Binding in Isolation Valve Solenoid Mechanism.Power Feed Removed from Valve

ML20086K979
Person / Time
Site:	Peach Bottom
Issue date:	05/13/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K972	List: ML20086K970 ML20086K979
References
AO-74-25, NUDOCS 8402070101
Download: ML20086K979 (2)

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Kr. Jx:es P. O'Reilly, Director , ,

United Statsa At:~.ic Ecrcy Cc nis :icn f I 3 ' 7M [#'

Dire:terate of F.eplatory Operati:nc c3l Park Avenue Eing of Pruccia. Pennsylvania 19IC5 ,

S:b$ae : /,bnermi 0:currence 2!. ?e tr !!otific, tion Confircing ry conversation with Mr. R. A. Feil A.I.C. Region I Regulate: .-

Cp ratiens Offi:e en by 13, 1974 Eeference: I.icence !! umber E7R !.4, in:ni ent Uucher 1 Technical Specificati:n E:ference 3 7.3 E: pert Iro.: 50-277-74-23 Ecp;rt Late: May 13, 1974 0:currence Eate: May 12, 1974 F::ility: Pench Ectt:s A:::i Tv.er Statien R. D. 1. Delta, Pennsylvania 17314 Identificatien cf C:currer.ce:

D.e contain=:n ic:lation b il valve for the Traverain: In-Core Fr.

CD) c;; hine U0. 4 failed to ciut.

Ocnditienc Prior to Cecurrence: . .

D.e r .:t:r was critical at 'a': ut'7,C p'cwer, 9D p;ic. Icel pre-c nditienici cp2rati:n was in pr crer::. .

5:::riptien of Occurrence:

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the icolati:n hall valve did not chut aut0:stically. The cperater ur.succcesfully atterpted t shut the valve using the renote canual .. .a.

Le i-.ation m ef App: ent Cause of Cecurren:e:

Sticking or 'cinding in the icolation valve sciencid =xhanis=.

Analyris of 0:eurrenee:

l D.is- incident hac no cig.ificant c+fety implicati ns. The control

_. ro:: cycrncen verifici the c:ntinuity of the explo'aive chear valve fer the :::. 4 !!P cachine. All other CIP richines were retracted in: .

their chieldr Ond oper:bility. of their isolation valves was verifici.

l Ehift Euper-: ic . cierted all c .t 1 r:: per: nnel to M preperai .

l .i: fire :no .xp'.::ive v,1 e chould any of the cc::diti:n'c 'arine whicc.

, rce;uire the v:lve := chut sut:natically. Werkteusi==c(intely

, cert:enced to frer- the valve tech..ica.

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