ML20084H674

AO BFAO-7433W:on 740521,FCO 64-44 Refueling Zone to Standby Gas Treatment Sys Crosstie Damper Failed to Open During Surveillance Test.Caused by Failure of Fsv 64-44 Pilot Solenoid Valve to Operate Due to Grease on Core Pole Face

ML20084H674
Person / Time
Site:	Browns Ferry
Issue date:	05/30/1974
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20084H677	List: ML20084H674 ML20084H684
References
AO-BFAO-7433W, NUDOCS 8305040721
Download: ML20084H674 (2)

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l'.r. John F. O' Lear, Director

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U.S. Atomic Energy Connission Washington, DC 20545

Dear Mr. O' Leary:

TD!ITESSEE VALLKI AUTRORITY - BRO',,'i:S FERRY ITUCLEAR PLAUT IIIIT 1 -

DOCCET 10. 50-259 - FACILITi OPERATIi;G LICZ:SE DPR AB:!OR"AL CCCURIC!CE REi' ORT 3FAC-7433W The enclosed report in to provide details concerninr; FC0 6414 outboard 4

refueling conc to S3TS crosst$o dermer which failed to open during a routine surveillance test and la submitted in accordance with Appendix A to Regulater/ Cuide 1.16, Revision 1 October 1973 This event occu: red 3

on Brouns Ferry I;uclear Plent unit 1 on ?? y 21,1974 Very truly yours, TK!UESSEE VALEI AUTI:0RITI Y

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E. F. Themas Director of Pouer Production Enclosure CC (Ibelosure):

Mr. I!or= n C. ?'osclcy, Director Region II Ec;alr.torf Operations Office, USAEC 230 Peachtree Street, EU., Suite 818 Atlrnta, Georgia 30303 N

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ABHOR!'AL OCCURR12 ICE REPORT

' Report Ho.: BFAO-7h33W

. Report Date: Pay 30,,1974 Occurrence Date: Mey'21, 1974-Facility: Brouns Ferry Hucicar Plant unit 1 e

' Identification ~of Ocpurrence FCO 64-44 outboard refueling zone to SGTS crosstie damper failed to open during a routine surveillance test.

Conditions Prior to Occurrence The reactor vas in a cold shutdown condition.

Descrintion of Occurrence

' While conducting a routine surveillance test, the FC0 64-44 refueling zone to SGTS crosstie denper failed to open. The operator innediately opened the redundant refueling zone _.to SGTS crosstie darper FC0 64-45.-

Desirmation of Attarent Ccuse of Occurrence The air operated FC0 64-44 danper failed to open due to failure of FSV 64-h4 pilot 0010n id 7:17: t Operc.tc.

The defective valve was inspected, and dried grease was found on the core pole face which prevented the solenoid valve from operati: g when deenergized.

Analysis of Occurrence The FSV 64-44 pilot solenoid. valve stuck during the surveillance test and prevented the FC0 64-44 der:per from operating. The redundtnt FC0 64-45 dc::per was proven operable %ediately and would have operated satisfactorily had a primary contain-ment isolation signal occurred.

Corrective Action The FSV 64-44 pilot solenoid valve was replaced with an operable valve and tested satisfactorily.

Other ASCO valves of this type are being inspected for grease on the core pole face.-

Failure Data i

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This type of pilot solenoid valve has no record of previous failures. The solenoid.

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valve is nanufactured by Automatic Switch Conpany valve catalog Ho HB830281RU;-

serial Ho. 35065A.

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