ML20085G489

Tenth Interim Deficiency Rept Re Potential Design Deficiency in Valve Yoke to Motor Maint Weld.Initially Reported on 740514.Spargers & Orifice Plate for Torus Line Installed

ML20085G489
Person / Time
Site:	Browns Ferry
Issue date:	11/26/1976
From:	Gilleland J TENNESSEE VALLEY AUTHORITY
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20085G493	List: ML20085G489 ML20085G504 ML20085G551 ML20085G575
References
NUDOCS 8308290106
Download: ML20085G489 (3)

Text

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I TENNESSEE VALLEY AUTHORITY 5 ,g CH ATTANOOGA. TENNESSEE 37401 E 2

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NOV 2 21976

, Mr. Nornaam C. Moselay, Director Office of Inspection and Enforeament U.S. helaar Regaistory Comunission Region II - Suite 818 130 Peachtree Street, NW.

Atlanta, Georgia 30303 Dear Mr. Moselays BROWNS FDtRY wnetvan PLANT UNITS 2 AND 3 - POTENTIAL DESIGN W.FICIENCY IN VALVE YOKE TO Myr0R MDUNT URLD Initial report of the senbject potential deficioney was made oe' May 14, 1974, and ws followed by our June 14, July 15. August 12 September 13, 1974 Jammary 15, 1975 March 3 and March 17, 1975, latters, J. E. G111aland to Donald F. Knuth. An eighth interim report was submitted to John G. Davis from J. E. G111 eland on March 30, 1976, and a miath interim report was submitted to Norman C. Moseley from J. E. G111ala=1 on August 5,1976. Because the yoka to motor base welds of PCV-74-58 in unit 1 failed, similar valves (FCv's 74-58 and 74-72) in unite 2 and 3 may be subject to the same type of failure.

The tenth interim report of EDE 191 is enclosed.

Very truly yours, J. E. Gi11aland Assistant hanager of Power maalaeurs CC (Realosure) .

Dr. E. Volgenas, Direster Office of InsFesties and Enforma===* ~

U.S. Nuclear Regulatory e - 4==iam Washington, DC 20555 l

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EUCLOSURE

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• v BROWNS FERRY NUCLEAR PLANT UNITS 2 AND 3 POTENTIAL FOR FAILURE OF THE UELD BEIVEEN THE YOKE AND MOTOR MOUNTING PLATE FOR FLOW CONTROL VAINES (FCV's) 74-58 A'ID 74-72 TENTH INTERIM REPORT DDN 191

, On May 14, 1974, an initial report regarding the subject deficiency was nade to W. S. Little, AEC-DRO Inspector, Region II. The report was made by L. D. Ucber and J. A. naulston in compliance with 10CFR50.55(e). There have been nine subsequent interim reports dated June 14, 1974; July 15, 1974; August 12, 1974; September 13, 1974; January 15, 1975; March 3, 1975; March 17, 1975: March 30, 1976; and August 5, 1976. The initial report was made because the veld between the joke and motor mounting plate of FCV 74-58 (4-inch globe valve) in the RHR test return line torus spray connection failed in unit 1.

Since the unit 1 failure appeared to be vibration related, the corresponding valves and valves in close proximity, such as FCV 74-59 (12-inch globe valve),

in units 2 and 3 were assumed to be potentially subject to a similar type of failure.

The spargers for all three units and the orifica plate for the unit 3 line discussed in the ninth interim report have been installed. A final fix has been proposed as described in the ninth interin report. A final report will be prepared and subnitted af ter the proposed final fix (the replacement of the 12-inch globe valves with drag-type valves) has been installed and confirmatory testing completed.

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