ML20091N439

Interim Deficiency Rept SD-53 Re Inadequate Lug Crimping in Isolator Cabinets,Main Ventilation,Air Conditioning & Other Panels Supplied by Systems Control.Initially Reported by 840215 Telcon.Final Rept Expected by 840927

ML20091N439
Person / Time
Site:	Millstone
Issue date:	06/01/1984
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
F0517A, F517A, SD-53, NUDOCS 8406120315
Download: ML20091N439 (2)

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June 1,1984 Docket No. 50-423 FO)l7A Dr. Thomas E. Murley Regional Administrator Region I U. 5. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

Reference:

(1) W. G. Counsil to T. E. Murley, F00500A, dated March 16, 1984.

Dear Dr. Murley:

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

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 potential significant deficiency involves inadequate lug crimping in isolator cabinets, main ventilation, air conditioning, and other miscellaneous panels supplied by Systems Control.

Our architect-engineer, Stone & Webster Engineering Corporation, has completed a one-hundred percent lug crimping inspection for all pre-turned-over panels supplied by Systems Control. Repair work for these panels will begin in mid-June, 1984. NNECO has completed a similar inspection program for all post-turned-over panels supplied by Systems Control and approximately seventy-eight percent of the repair work has been completed for these post-turned-over panels.

The inspection programs revealed that approximately forty to sixty percent of the terminations in the panels supplied by Systems Control for Millstone Unit No.

3 had incomplete or incorrectly crimped lugs tha't met the rejection criteria specified in the manufacturer's Instruction / Maintenance / Inspection Manual. The repaired lugs will be installed to meet the manuf acturer's installation criteria.

8406120315 840601 PDR ADOCK 05000423 S PDR l0 , e. n

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~ We are not able to prcJide you with a final report at this time. We will provide an update or a final report on this matter by September 27,1984. l l

- Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY

'/ AkW W. G. Counsil

. Senior Vice President cc: Mr. R. C. DeYoung, Director Division of Inspection and Enforcement U. S. Nuclear Regulatory Commission Phillips Building 7920 Norfolk Avenue Bethesda, MD 20014 l

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