ML20069E475

Interim Deficiency Rept Re Fire Damper Failure.Initially Reported on 821029.Hooks on All Seismic Fire Dampers Mfg by Air Balance,Inc Will Be Reversed to Point Open End Away from Blade.Final Rept Will Be Submitted by 830615

ML20069E475
Person / Time
Site:	Zimmer
Issue date:	03/07/1983
From:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, QA-2280, NUDOCS 8303220064
Download: ML20069E475 (2)

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. x, TIIE CINCINNATI GAS & ELECTRIC COMPANY set - "

CINCINN ATI, OHIO 45201 Mmxh 7,1983 QA-2280 L A. BORG MANN SEmoR VICE PRESIDEPe?

U.S. Nuclear Regulatory Commission Region III Roosevelt Rd.

Glen Ellyn, Illinois 60137 Attention: Mr. J. G. Keppler Regional Administrator RE: WM. H. ZIMMER NUCLEAR POWER STATION UNIT 1 10CFR50.55(e) - ITEM M FIRE DAMPER FAILURE DOCKET NO. 50.358, CONSTRUCTION PERMIT NO. CPPR-88, W.O. 57300, JOB E-5590, FILE NRC-8, M-62 Gentlemen:

This letter constitutes an interim report concerning the

, subject condition initially reported to the NRC on October 29, i 1982 under the requirements of 10CFR50.55(e).

As stated in our previous report, QA-2228, dated January 21, 1983, fire dampers, manufactured by Air Balance, Inc. (ABI) of Chicago, Illinois, and supplied to the Zimmer Project by Waldinger, Young and Bertke Company, are located in various safety related systems in the plant. Catalog data for these dampers show "J" hooks joined by a fusible link. This configuration restrains the damper from closing until ambient temperatures reach 160 F when, by design, the link melts and the hooks fall allowing the damper blade to drop, isolating the asscciated ductwork.

One damper, IVD04YA, located in the Diesel Generator Ventilation System was identified in which the fusible link had melted and the hooks latched onto the damper blade, prohibiting proper closure of the damper. This problem is attributed to the fact that the hooks were installed by the manufacturer with the open ends of the hooks pointed upward toward the blades.

To prevent recurrence of this problem, the orientation of the hooks on all seismic ABI fire dampers will be reversed so that the open end is pointed away from the blade. The appropriate design changes and physical work is expected to be completed and a final report submitted by June 15, 1983. We trust the above 8303220064 g30307 PDR S ADOCK 05000358 PDR hlAR 171983 f2d * ,

Paga 2 10CFR50.55(o) - Itca M-62 F.pbruary 28, 1983

'OA-2280 will be found acceptable as an interim report under 10CFR50.55(e).

Very Truly Yours, THE CINCINNATI GAS & ELECTRIC COMPANY By E. A. BORGMANN Senior Vice President EAB/FKP/apc cc: NRC Office of Inspection and Enforcement Washington, D.C. 20555 NRC Senior Resident Inspector ATTN: W. F. Christianson NRC Zimmer Project Inspector Region III 5

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