ML20083F828

Interim Deficiency Rept,Item M-46 Re Turning Vane Failures in Essential HVAC Sys.Initially Reported on 820510.Design Mods Completed.Adequacy of Vanes Less than 30 Inches Wide in Elbows Will Be Verified

ML20083F828
Person / Time
Site:	Zimmer
Issue date:	12/29/1983
From:	Williams J CINCINNATI GAS & ELECTRIC CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
10CFR-050.55E, 10CFR-50.55E, LOZ-83-0256, LOZ-83-256, M-46, NUDOCS 8401100383
Download: ML20083F828 (2)

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THE CINCINNATI GA'S & ELECTRIC COM PANY GE CINCINNATI,OHto 45201 December 29, 1983 s.wiu Aus,an LOZ-83-0256 SENIOR vtCE PRESIDENT NUCLEAR OPERATIONS Docket No. 50-358 U.S. Nuclear Regulatory Commission Region III 799 Roonevelt Road Glen Ellyn, Illinois 60137 Attention:' Mr. J.G. Keppler Regional Administrator Gentlemen:

RE: WM. H. ZIMMER NUCLEAR POWER STATION - UNIT 1 10CFR50. 55 f e) , ITEM M-46 TURNING VANE FAILURES IN ESSENTIAL HVAC SYSTEM W.O. 57300, JOB E-5590, FILE NO. 956C, This letter constitutes an interim report concerning the subject reportable condition reported to the Commission on May 10,- 1982 under 10CFR50.55 (e) . Our previous report LOZ-83-0121 was submitted September 9, 1983.

The design of the modifications to essential turning vanes has been completed. The modifications will be applicable to approximately 160 essential elbows having one of the following characteristics:

1) . Vane width greater than 30 inches, or 2). Located within 5 duct diameters of a fan discharge, or

3) . Located within the Control Room boundary.

An inspection program will be used to verify the adequacy of turning vanes less than 30 inches wide in essential elbows. The inspection program will consist of visually inspecting a random sample of' elbows for vane failures after verifying from plant operating logs that the HVAC system and related ductwork have been operated for a minimum of 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br />. Control Room HVAC (VC), Reactor Building Ventilation (VR) and Switchgear Heat Removal (VX) systems will be involved in the inspection program.

Any deficiencies discovered during the inspection program will be corrected. Completion of Air Test and Balance of HVAC systems VC, VR, VX will not be required prior to the inspection program.

0l0 8401100383 831229 PDR ADDCK 05000358 JAN 5 584 4M S PDR.

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Mr.'J.G. Keppler Regional Administrator December 29, 1983 LOZ-83-0256 Page 2 Implementation of the modification work to the turning vanes and the inspection program will be performed in accordance with the programs outlined in CG&E's Course of Action.

A final report will be submitted upon completion of the ,

corrective actions.

We trust the above will be found acceptable as an interim report under 10CFREO.55 (e) .

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY By , - C J. WILLIAMS, . A SENIOR VICE PRESIDENT DJS/sfr cc: NRC-Office of Inspection & Enforcement Washington, D.C. 20555 NRC Resident Site Supervisor ATTN: W.M. Hill NRC Zimmer Project Inspector, Region III ATTN: E. R. Schweibinz

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