ML20072L923: Difference between revisions

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#REDIRECT [[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]]
| number = ML20072L923
| issue date = 07/08/1983
| title = 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
| author name = Counsil W, Sears C
| author affiliation = NORTHEAST UTILITIES
| addressee name = Murley T
| addressee affiliation = NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
| docket = 05000423
| license number =
| contact person =
| document report number = 10CFR-050.55E, 10CFR-50.55E, B10837, SD-41, NUDOCS 8307140241
| document type = DEFICIENCY REPORTS (PER 10CFR50.55E & PART 21), TEXT-SAFETY REPORT
| page count = 1
}}
 
=Text=
{{#Wiki_filter:_ _ - _ _ _        __
General Offices
* Seldon Street. Berlin. Connecticut
                            '"C"C'*#""*'"'"""
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[o",            $7""                                                                              HARTFORD. CONNECTICUT 06141-0270 g        .omm.sv utuns navics cow-                                                                          (203) 666-6911
                            .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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