ML20099G822
| 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
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P.O. BOX 270
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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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