ML20065C659

Interim Deficiency Rept 82-08 Rept Re Potential Problem W/ Electrical Penetration Assemblies.Initially Reported on 820817.Pull Test Revealed Cables Failed 180-lb pull-out Force.Final Rept or Updated Schedule Expected by 821227

ML20065C659
Person / Time
Site:	LaSalle
Issue date:	09/16/1982
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, 5042N, NUDOCS 8209240267
Download: ML20065C659 (2)

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p j{ ;\ Commonwrith Edison

/ One First National Plaza. C;hicago, Ilknois f i V - Address Reply to: Post Office Box 767 Chicago. Illinois 60690 l

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I j September 16, 1982 Mr. Jame s G. Kepple r , Regional Administrator Directorate of Inspection and Enforcement - Region III

U.S. Nuclear Regulatory Commission 1

799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

LaSalle County Station Unit 2 Electrical Penetration Assemblies 10 CFR 50.55(e) In terim Report 82-08 NRC Docke t No . 50-374 t

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Dear Mr. Keppler:

On August 17, 1982, Commonwealth Edison Company notified

! Mr. R. C. Knop of your staf f of a potential problem with the LaSalle County Station Unit 2 Electrical Penetration Assemblies. The purpose of this letter is to provide an interim report in accordance with the provisions o f 10 CFR 50.55(e) .

4 Description o f Deficiency Each Electrical Penetration Assembly contains seven (7) round " epoxy" modules through which extra flexible cables are fed.

The extra flexible cables were butt spliced by the manufacturer (Bunker Ramo) to seven (7) strand cables on both the inboard and outboard sides of the penetration.

Based on problems experienced by Consumers Power Company at their Midland Plant, a sample of four (4) butt splices which connected #2 AWG cables was tested. Two o f the four splices f ailed to meet the 180 lb. pull-out force indicated in Underwriters Laboratories Standard UL 486A. The butt splice connecting the two

1. 2 cables was uninsulated, indent-crimped once for each cable and stamped "2 - AIR " . Inspection of splices which connected #6 and #10 cables indicated the same configuration, i.e. an extra flexible cable spliced to a seven (7) strand cable. These butt splices were also uninsulated, indent-crimped once for each cable and stamped "6- AIR " (for #6 AWG) and "6 9YSB12 10" (for #10 AWG). No pull tests have been performed on either #6 or #10 cables at this time.

d r Si 8209240267 820916 l DR ADOCK 05000374 PDR eg N g

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Corrective Action Commonwealth Edison Company Pr_oject En'gineering'is in the ,

process of determining what additional testing is required on the splices. Discussion has been conducted with: Consumers .Powe.r Company, who have the same problem at Midland; Burndy, the manufacturer of the butt splices; ANCO Engineering, .which1 acquired the product rights and document' a tion' from Bunker Ramo when the Amphenol Sams Division went out o f the penetration business. 'At present, no decisions have been made concerning the scope of the, additional testing. .

Schedule ,

i Commonwealth Edison anticipates completi.on of test'ing in approximately three (3) months. Region III will receive a final report or updated schedule on or about December 27, 1982.

If there are any questions in this matter, please contact this office.

Very truly yours,

~lflGf%L C. W. Schroeder Nuclear Licensing Administrator cc: Director of Inspection and i En forcement Washington, DC NRR Resident Inspector - LSCS 5042N l

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