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| p j{ ;\ Commonwrith Edison
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| / 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
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| ; U.S. Nuclear Regulatory Commission 1
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| 799 Roosevelt Road Glen Ellyn, IL 60137
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| ==Subject:==
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| 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:==
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| On August 17, 1982, Commonwealth Edison Company notified
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| ! 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) .
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| 4 Description o f Deficiency Each Electrical Penetration Assembly contains seven (7) round " epoxy" modules through which extra flexible cables are fed.
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| 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.
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| 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
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| #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.
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| 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 ,
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| 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. .
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| Schedule ,
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| 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.
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| If there are any questions in this matter, please contact this office.
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| Very truly yours,
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| ~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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