ML20116P181

Final Deficiency Rept (SD-53) Re Lugs Not Crimped in Accordance W/Manufacturer Specs in Isolator Cabinets,Main Ventilation & Air Conditioning Supplied by Sys Controls. Rework on Lugs Expected to Be Completed by 850615

ML20116P181
Person / Time
Site:	Millstone
Issue date:	04/16/1985
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
(SD-53), F0643A, F643A, NUDOCS 8505070546
Download: ML20116P181 (2)

Text

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N. .c N HARTFORD. CONNECTICUT 06141-0270 L t T; C'* j *l'= "*,* (203) 666-6911 April 16,1985 Docket No. 50-423 F0643A Dr. Thomas E. Murley Regional Administrator U.S. Nuclear Regulatory Commission Region I 631 Park Avenue King of Prussia, PA 19406

References:

(1) W. G. Counsil letter to T. E. Murley, F0500A, dated March 16,1984.

(2) W. G. Counsil letter to T. E. Murley, F0517A, dated June 1, 1984.

(3) W. G. Counsil letter to T. E. Murley, F0569A, dated September 26,1984.

Dear Dr. Murley:

Millstone Nuclear Power Station, Unit No. 3 Reporting of Potential Significant Deficiencies in Accordance with 10CFR50.55(e):

Isolator Cabinets, Main Ventilation, Air Conditioning, and Other Miscellaneous Panels with Improperly Crimped Lugs (SD-53)

In a February 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 construction of Millstone Unit No. 3 as required by 10CFR50.55(e). The deficiency involved lugs which were not crimped in accordance with the manufacturer's specifications in isolator cabinets, main ventilaticn, air conditioning, and other miscellaneous panels supplied by Systems Control. We have determined that this condition represents a significant deficiency in the final design of Millstone Unit No. 3.

Our architect-engineer, Stone & Webster Engineering Corporation, has completed the repair of all improperly crimped lugs in the pre-turned-over panels for which they were responsible, including the installation of the approximately 130 resistors which were discussed in Reference (3). NNECO has also completed all of the repair work for the lugs in the post-turned-over panels.

However, NNECO is still in the~ process of repairing the lugs in several energized, turned-over circuits within pre-torned-over panels. Rework on these lugs is expected to be complete by June 15,1985.

I 8505070546 850416 PDR ADOCK 05000423 /10 FEM g S PDR f

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. 7 We consider this to be our final report for SD-53. We trust that the above information satisfactorily responds to your concerns.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY W. G. Counsil Senior Vice President cc: Mr. 3. M. Taylor, Director Division of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, D.C. 20535