ML20100F620

Potential Significant Deficiency Rept SD-48 Re Main Control Board Lugs.Initially Reported on 831110.Seismic Testing & Repairs Completed.Final Test Rept Being Prepared.Next Rept Due by 850227

ML20100F620
Person / Time
Site:	Millstone
Issue date:	11/20/1984
From:	Counsil W NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
F0502A, F502A, SD-48, NUDOCS 8412060703
Download: ML20100F620 (2)

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j[ (203) 665-5000 November 20,1984 Docket No. 50-423 F0502A Dr. Thomas E. Murley Regional Administrator Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406

References:

(1) W. G. Counsil letter to T. E. Murley, F0433A, dated December 9,1983.

(2) W. G. Counsil letter to T. E. Murley, F0450A, dated March 1, 1984.

Dear Dr. Murley:

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

Main Control Board Lugs (SD-48) in a November 10,1983 telephone conversation between your Mr. T. Elsasser and our Mr. J. Festa, 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 involved inadequate terminations of #14 AWG Tefzel and ITT Exane wire to AMP PIDG 53983-1 16-14 HD lugs in the main control board supplied by Reliance Electric Company. In addition, Reliance Electric identified two other areas of concern in their inspection regarding configurations not included in the original seismic test report. The first of these concerned 16-14 AWG lugs that were used to terminate 20 AWG resistor leads on Cutler-Hammer Type E-30 switches and on Stanwick terminal blocks. The second area regarded 16-14 AWG lugs : hat were terminated to the conductors using an ETC crimper. We completed our evaluation of the problem regarding inadequate terminations to the lugs in the main control board and determined that it is a significant deficiency (see References I and 2).

Reliance Electric Company has completed a 100% inspection of all lugs within their supplied panels. In addition, our architect-engineer, Stone & Webster Engineering Corporation, has completed all of the repair work for the improperly crimped lugs in the pre-turned-over panels. NNECO is in the progress of repairing the subject post-turned-over panels.

Regarding the other two areas of concern, Reliance Electric has completed the seismic testing of these two configurations in accordance with the seismic 8412060703 841120 PDR ADOCK 05000 s

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portion of IEEE-323. The mild environment qualification plan (Report Number SQP-99X2087-A) has also been revised accordingly.

Reliance Electric is in the process of developing their final test report. We will provide you with an update on this matter by February 27,1985.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY 30Z&Y&f 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 r

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