ML20092M617

Interim Deficiency Rept SD-50 Re phase-to-phase Electrical Fault in Motor Control Ctr Supplied by Gould,Inc.Initially Reported on 840116.Next Rept Will Be Provided by 840802

ML20092M617
Person / Time
Site:	Millstone
Issue date:	06/20/1984
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
F0529A, F529A, SD-50, NUDOCS 8407020324
Download: ML20092M617 (2)

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June 20,1984 Docket No. 50-423 F0529A Dr. Thomas E. Murley Regional Administrator Region I ,

U. S. Nuclear Regulatory Commission 631 Park Street King of Prussia, PA 19406

Reference:

(1) W. G. Counsil to T. E. Murley, F0467A, dated Feburary 15, 1984.

(2) W. G. Counsil to T. E. Murley, F0493A, dated March 23,1984.

Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies In Design and Construction:

Phase-to-Phase Electric Fault in a Motor Control Center (SD-50)

In a January 16, 1984 telephone conversation between the NRC Resident inspector, Mr. T. Rebelowski and our Mr. D. B. Vail, Northeast Nuclear Energy Company (NNECO) reported a potential significant deficiency in ~ the construction of Millstone Unit No. 3 as required by 10CFR50.55(e).

Subsequently, this was followed up with another telephone conversation with your Mr.T. Elsasser on Janaury 17, 1984. The potential significant deficiency involves a phase-to-phase electrical fault which occurred in a motor control center (MCC) supplied by Gould, Inc. while a technician was testing with a clamp-on ammeter. The fault occurred between adjacent phases of the uninsulated cable adapters used to terminate oversized cables to MCC circuit breakers and starters.

We have received the seismic qualification data from Gould, Inc. regarding the uninsulated cable adapters which were used to terminate oversized cables to the MCC circuit breakers and starters. This information is presently being reviewed by our architect-engineer, Stone & Webster Engineering Corporation.

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