ML20206S254

Confirms Resolution of Thermo-Lag Fire Barriers in Fire Zones OB-FZ-6A & OB-FZ-6B (480 Switchgear Rooms) IAW Previous Commitments Contained in Gpuns Ltrs to NRC & 971001

ML20206S254
Person / Time
Site:	Oyster Creek
Issue date:	01/20/1999
From:	Roche M GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1940-98-20735, NUDOCS 9901280296
Download: ML20206S254 (1)

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{ GPU Nuclear,inc.

( U.S. Route #9 South NUCLEAR Post Office Box 388 Forked her, NJ 087310388 Tel 609-9714000 January 20,1999 1940-98-20735  !

U. S. Nuclear Regulatory Commission Attention: Document Control Desk .

Washington,DC 20555 Gentlemen:

Subject:

Oyster Creek Nuclear Generating Station (OCNGS)

Docket No. 50-219 Facility Operating License No. DPR-16 10 CFR 50 Appendix R Fire Protection -Thermo-Lag Resolution This letter confirms resolution of the Thermo-Lag fire barriers in fire zones OB-FZ-6A and OB-FZ-6B (480V Switchgear Rooms) in accordance with previous commitments contained in GPU Nuclear's letters to the NRC dated October 19,1996 (6730-96-2210) and October 1,1997 (6730- )

97-2247). Upgrade or modification of the existing installed Thermo-Lag 1-hour fire barriers using Mecatiss fire barrier material has been completed for these fire zones. Reevaluation ofinstalled

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Thermo-Lag on ventilation system duct work within these fire zones has detennined that this l protection is not required for the subject duct work. Additionally, in response to OCNGS LER 98-  !

002, a circuit bypass modification has been installed in the 480V Switchgear Room ventilation system fan control logic to correct an identified deficiency in the original installed fire barrier protection. Accordingly, GPU Nuclear considers the Thermo-Lag fire barrier issue resolved for i fire zones OB-FZ-6A and OB-FZ-6B and compensatory measures have been removed from these j two fire zones since the effected fire barriers have been restored to operable status.

If any additional information is needed, please contact Mr. David J. Distel, Corporate Regulatory

' Affairs, at (973) 316-7955.

Sincerely, kg h 00 Michael B. Roche 1

Vice President and Director y l 9901290296 9901207 O' l DR ADOCK o 2 Oyster Creek p ]

gba/DJD N"'

cc: Administrator, Region 1 OCNGS Senior Project Manager OCNGS Senior Resident inspector