ML20055A510

Interim Part 21 Rept Re Fuse Link Assembly on Zack Co safety-related Fire Dampers,Initially Reported 820609.New Fuse Link Assemblies Should Be Installed by 820901

ML20055A510
Person / Time
Site:	LaSalle
Issue date:	07/08/1982
From:	Schroeder C COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-82-677-000 10CFR-50.55E, 4485N, PT21-82-677, PT21-82-677-000, NUDOCS 8207190094
Download: ML20055A510 (2)

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Commonwealth E1'Tson

( One first N;tionit Plan Chic:go. Ilhnois

( ) Address Reply to Post Oftce Box 767 q ,

, Chicago. Ilknois 60690 Jul y 8, 1982 Mr. Jame s G. Keppler, Regional Administrator Directorate o f Inspection and Enforcement - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

LaSalle County Station Unit 2 Zack Company Fire Dampers 10 CFR 50.55(e) Final Report

1. 82-04 NRC Docket No. 50-374 Reference (a): R. H. Holyoak letter to J. G. Keppler da te d Jul y 7, 1982, Special Report .

Dear Mr. Keppler:

C. W. Schroeder and D. L. Shamblin o f Commonwealth Edison Company notified Mr. R. D. Walker of your staff, on June 9, 198 2, o f a possible reportable deficiency on certain fire dampers provided by Zack Company . That notification was made in accordance with 10 CFR 50.55(e) for Unit 2. Re ference (a) was submitted to you for LaSalle County Station Unit 1.

Description of De ficiency On Ju ne 8, 1982, Zack Company informed Commonwealth Edison Company of a possible problem with 42 Unit 1 and Unit 2 safety related fire dampers having a blade width o f 18 inches or less.

Apparently, the manufacturer's 21/2 inch fuse link assembly was not wide enough, causing the clinch straps to be held tight against the blade stack. This may prevent the blades from dropping freely.

Corrective Action In order to correct the possible deficiency, the manufacturer recommended installing a 3 inch fuse link assembly.

This will prevent the clinch strap from interfering with the blade stack.

On Ju ne 9, 1982, clover hooks for the 3 inch fuse link assemblies were ordered by the Zack Company. These arrived at LaSalle County Station on June 28, 1982. Installation on all 42 Unit 1 and Unit 2 af fected safety related fire dampers was completed on July 1, 1982.

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o J. G. Keppler July 8, 1982 A similar problem may also affect 51 non-safety related Unit 1 and Unit 2 fire dampers with blade widths o f 18 inches or less. Commonwealth Edison is proceeding with the replacement of the 2 1/2 inch fuse link assemblies with 3 inch fuse link assemblies.

The replacement of the fuse link assemblies on all 51 non-safety related fire dampers is scheduled for completion by July 16, 1982.

As s tated in Reference (a), Commonwealth Edison commits to complete j this replacement on all 51 non-safety related fire dampers by I 9-01-82.

Please address any further questions concerning this matter to this office.

Very truly yours, t}s)%'L C. W. Schroeder Nuclear Licensing Administrator 1m cc: Director o f In spect *_an and En forcement Washington, D.C. 20555 NRC Resident Inspector - LSCS 4485N