B10837, Interim Deficiency Rept SD-41 Re Potential Failure of Gould Type He 4 Breakers to Close.Initially Reported on 830608. Cause Not Yet Determined.Discussions W/Vendor Initiated
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| ML20072L923 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/08/1983 |
| From: | Counsil W, Sears C NORTHEAST UTILITIES |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, B10837, SD-41, NUDOCS 8307140241 | |
| Download: ML20072L923 (1) | |
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|---|---|
Category:DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21)
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Text
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General Offices
- Seldon Street. Berlin. Connecticut
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.oatmas, wcaam swaav cow-July 8,1983 Docket No. 50-423 B10837 Dr. Thomas E. Murley, Regional Administrator Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Dear Sir:
Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Design and Construction: Gould Type HE 4 B.eakers (SD-41)
In a June 8,1983 telephone conversation between your Mr. T. Elsasser and our Mr. R. E. Lefebvre, Northeast Nuclear Energy Cornpany (NNECO) reported a potential deficiency in the design and construction of Millstone Unit No. 3 as required by Title 10, Code of Federal Regulations, Part 50, Paragraph 55(e).
The potential significant deficiency involved a Gould Type HE 4100 amp frame-size breaker in 480 V MCC which failed when the "C" pole did not close when the breaker was operated. Three-phrase loads will not operate if one pole of the supply breaker is open. The breaker was purchased on a Category 1 specification, however, it was not supplying a safety load in this instance.
The exact cause of the failure has not been determined at this time. Discussions with the vendor have been initiated and details will be provided to you as they become available.
l Very truly yours,
\D . O. &r W. G. Counsil Senior Vice President
%^L_
By: C. F. Sears Vice President Nuclear and Environmental Enginetring 8307140241 800708 PDR ADOCK 05000423 g S PDR g{p
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