ML20085G389

AO BFAO-7319W:on 731001,reactor Water Cleanup Sys Valve PCV-69-12 Failed.Caused by Stripped Brass Worm Gear Teeth of SMB-00 Limitorque Operator.Operator Replaced & Frequency of Surveillance Increased to Monthly

ML20085G389
Person / Time
Site:	Browns Ferry
Issue date:	10/10/1973
From:	Eric Thomas TENNESSEE VALLEY AUTHORITY
To:	Oleary J US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085G391	List: ML20085G389 ML20085G392
References
AO-BFAO-7319W, NUDOCS 8308290038
Download: ML20085G389 (2)

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V TENNESSEE VALLEY AUTHO AITY C""5 CHATTANOOGA, TENNESSEE i f /C 37401 L

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Mr. John F. O'icary, Director

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Directorate of Licencing

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Washington, DC 20545 N

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Dear Mr. O'Icary:

TENNESSEE VALLEY AUTEORITY - BROWNS FERRY UUC12AR PLANT U'11T 1 -

DOCKET H0 50-259 - FACILITY OPERATING LICENSE DPR ABNOR'4AL OCCURREUCE REPORT EFAO-7319W The purpose of this report is to provide details concerning failure of the Erowns Ferry Nuclear Plant unit 1 Reactor Water Cleanup System valve PCV-69-12. This condition was reported to the Region II Directorate of Regulatory Operations on October 1, 1973 Description of the Incident On October 1,1973, during perfomance of SI 4 7.D section 1.B.1 j

(Primary ContainmOnt Isolation Valve Operability Test), Reactor Water Cleanup Syctem valve PCV-69-12 ccce fully open from a i

throttled pocition and then could not be cloced remotely. The reactor was at 1,000 pcig during startup tecting.

Investi<tation and Corrective Action Valve PCV-69-12 is a Velan valve with a SMB-00 Limitorque operator.

An investigation showed that the valve could be cloced by the handvhcel but not with the electric motor. The Limitorque operator was removed from the valve and an identical Limitorque operator, borrowed from unit 2, was installed in its place to return the valve to nomal service.

A functional tect of this valve was caticractorily perfomed with the nov operator.

The Limitorque operator which was removed from unit 1 PCV-69-12 was 2

takcn to the chop for dicacccably and repair. Im inspection of tne internal parts of the Limitorque operator revealed that a 120 cegment j

' of teeth on the brass vom gear was stripped. The exact cauce of the 8308290038 731010

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2 Mr. John F. O' Leary October 10, 1973 TENNESSEE VALIEY AUTHORITY - ERGUNS FERRY NUCLEAR PLCT UNIT 1 -

DOCKET NO. 50-259 - FACILITY OPERATING LICENSE DPR ABNOFMAL f

OCCURRENCE REPORT BFAO-7319W

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failure is not known. Thisisthefi$stfailureofthistypevehave experienced. The frequency of surveillance vill be increased from quarterly to monthly until three successive test,s have been achieved.

Very truly yours, TENNESSEE VALLEY AUTHORITY

~ F. A..ocas i

1 rector of Power Production E

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Mr. Noman C. Moseley, Director Region II Regulatory Operations. Office,,USAEC 230 Peachtree Street,:N.

Atlanta, Georgia 30303

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