ML20099G822

Final Deficiency Rept (SD-65) Re Defective GE SAM Timing Relays.Initially Reported on 841115.Printed Circuit Cards Replaced W/New Card Design

ML20099G822
Person / Time
Site:	Millstone
Issue date:	02/20/1985
From:	Counsil W, Sears C NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(SD-65), F0662A, F662A, NUDOCS 8503150093
Download: ML20099G822 (2)

Text

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1 General Offices

• Selden Street, Berlin. Connecticut vw a=cvcur mia .o== co**

P.O. BOX 270

.a ca ..reaaomaco ,,, HARTFORD CONNECTICUT 06141-0270 g sommast urums wa.cs co (203) 666-6911 esents.37 estag.p gMEaOT CouPaste February 20,1985 Docket No. 50-423 F0662A Dr. Thomas E. Murley Regional Administrator l Region I l U. S. Nuclear Regulatory Commission l 631 Park Avenue King of Prussia, PA 19406

Reference:

(1) W. G. Counsil letter to T. E. Murley, F0640A, dated December 14,1984.

Dear Dr. Murley:

Millstone Nuclear Pow;r Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Design and Construction:

General Electric SAM Timing Relays (50-65) 1 In a November 15,1984 telephone conversation between your Mr. T. Rebelowski and our Mr. R. E. Lefebvre, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in the constructo n of Millstone Unit No. 3 as required by 10 CFR 50.55(e). The potential significant deficiency involves SAM timing relays supplied by General Electric (GE). GE notified us that there is a potential for SAM 11,13,15 and certain SAM 99 relays to operate in less time than the set time delay. Some of these relays are used in safety-related equipment.

We have completed our evaluation and determined that SAM 11 timing relays are used at Millstone Unit No. 3 and that some of these are used in safety-related applications. This is a significant deficiency for Millstone Unit No. 3.

To correct this problem, GE has provided a new printed circuit card design. Our architect-engineer, Stone & Webster Engineering Corporation, is proceeding with the replacement of all existing printed circuit cards for SAM 11 timing relays used at Millstone Unit No. 3 with this new card design.

8503150093 850220 PDR ADOCK 05000423 S PDR I D o eM

1 We consider this to be our final report for SD-65. We trust that the above information satisfactorily responds to your concerns.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY b . b .C W. G. Counsil Senior Vice President By: C. F. Sears Vice President cc: Mr. J. M. Taylor, Director Division of Inspection and Enforcement U. S. Nuclear Regulatory Commission Phillips Building 7920 Norfolk Avenue Bethesda, MD 20814 1

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