ML19322A091

Repts Significant Deficiency of Bif Industries Butterfly Valves on 781024:shaft Key Locking Operator Spline Adapter to Valve Stem & Spline Adapter May Vibrate Loose,Disengaging Valve Driving Torque,Rendering Valve Inoperable

ML19322A091
Person / Time
Site:	Hope Creek, 05000355
Issue date:	11/20/1978
From:	Martin T Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19322A090	List: ML19322A091
References
NUDOCS 7901020213
Download: ML19322A091 (2)

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%cmas J. Martin Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 201/430-8316 '

ce Prtsident ng.nwing end construction November 20, 1978 Mr. Boyce H. Grier, Director ,

U. S. Nuclear Regulatory Commission a Office of Inspection'and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

BIF INDUSTRIES - BUTTERFLY VALVES 10CFR50.55(e), "SIGNIFICANT DEFICIENCY" NO. 1 AND 2 UNITS HOPE CREEK GENERATING STA TION On October 24, 1978 a verbal report was made to Region 1, Office of Inspection and Enforcement representative Mr. S.

Ebneter advising that the subject vendor had notified our architect engineer, Bechtel Power Corporation, of a possible operating defect on Limitorque' motor and manual operators.

This report was provided in accordance with the provisions of 10CFR50.55(e).

The following supplemental information is hereby submitted pursuant to our initial report and in accordance with the re-quirements of 10CFR50.55(e):

1. Description of the Deficiency The shaft key that locks the operator spline adapter to the valve stem and the spline adapter may vibrate loose, disengaging the driving torque to the valve, rendering the valve inoperable.

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This problem will most likely occur when the valve is in-stalled in a horizontal pipeline with the valve shaft in the vertical plane and with the operator under the valve.

2. Analysis of the Condition and Safety Implication

. A total of twelve (12) valves are involved. Their applica-tion was intended as isolation valves for RHR heat ex-changers and Safety Auxiliaries Cooling Systems (SACS) 790102 02/.3

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Mr. B. H. Grier 11/20/78 pumps. Had this condition gone undetected and the operator spline vibrated loose under flow conditions, the valves would have closed, isolating the systems to

-which they belong.

3 Corrective Action The following corrective action, as recommended by the manufacturer, has been completed on November 2, 1978 by Bechtel personnel under the supervision of the BIF j factory representative:

(a) Removed pointer cap from operator.

(b) Positioned spline adapter flush with the end of the valve stem. Positioned shaft key slightly below (1/16") the face of the spline adapter.

(c) Utilizing a center punch, staked the edges of the spline adapter and the valve shaft around the end of the keyway to prevent the key from slipping past the flush position.

(d) Reinstalled pointer cap.

Bechtel has also e stablished a temporary hold point at BIF to verify that the valve shaft key is properly installed and staked or tacked as required. They have also instructed their supplier representative to verify the proper key in-stallation in a quality surveillance report until confidence is developed that BIF is following the new instructions.

If you require additional information, we will be pleased to discuss it with you.

Very truly yours, t

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! CC Mr. John H. Davis Bethesda, Md.

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