ML20085M363

Interim Deficiency Rept Re Failure of Operator Mechanism of Valve FCV-74-73 in RHR Sys.Initially Reported on 731222. Failure Due to Lock Nut Failure to Secure Nut.Final Rept Will Be Provided by 740221

ML20085M363
Person / Time
Site:	Browns Ferry, 05000000
Issue date:	01/23/1974
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	Knuth D US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085M352	List: ML20085M358 ML20085M363
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8311080319
Download: ML20085M363 (1)

Text

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TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNESSEE 37401 January 23, 1974 num,vens,ny

. 05ETNEn's"HN Mr. Donald F. Knuth, Director Directorate of Regulatory Operations T U.S. Atomic Energy Commission Washington, DC 20545

Dear Mr. Knuth:

Initial report of a deficiency involving FCV-74-73 in Browns Ferry Nuclear Plant unit 2 was made on December 22, 1973. In accordance with paragraph 50.55(c) of 10 CFR 50, this is submitted as an interim report.

During Preoperational Test No. G-31, the operator mechanism of FCV-74-73 in the Residual Heat Removal System failed mechanically.

The failure was apparently caused by the lock nut's failure to secure the stem nut which allowed the stem nut to travel without actuating the valve.

We are assembling and evaluating information from TVA files, the .

manufacturer, and the Browns Ferry site relative to this failure in order to determine the cause of the failure, the appropriate corrective action, and the measures to be taken to prevent a recurrence of the failure. We expect to submit. a final report by February 21, 1974.

Very truly yours,

/

, J. E. Gilleland Assistant to the Manager of Power CC: Mr. Norman C. Moseley, Director Directorate of Regulatory Operations U.S. Atomic Energy Commission Region II - Suite 818 4

230 Peachtree Street, NW.

Atlanta, Georgia 30303

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