ML20063A798

Submits Addl Info on Fire Barrier Qualifications,In Response to Generic Ltr 92-08.Note That Fire Zone 3.1-1 (U-1 Cable Tunnel) Addition to Listing of Fire Zones Provided in Initial Response to NRC Bulletin 92-001

ML20063A798
Person / Time
Site:	Byron
Issue date:	01/13/1994
From:	Vonk M COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
References
GL-92-08, GL-92-8, IEB-92-001, IEB-92-1, NUDOCS 9401270027
Download: ML20063A798 (2)

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Ccmmsnwtalth Edissn

,_~.-.;.s 1400 Opus Place

• Downers Grove, Ithnois 60515 i .

January 13,1994 1 4

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. U.S. Nuclear Regulatory Commission l Office of Nuclear Reactor Regulation Washington, DC 20555 l

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Attention: Document Control Desk '

1

Subject:

Byron Station Units 1 and 2 i

, Additional Information on Fire  :

Barrier Qualifications Docket Numbers 50-454 and 50-455 i

References:

(1) Letter from M.A. Jackson to U.S. NRC dated July 23,1992

, (2) Letter from M.A. Jackson to Dr. T.E. Murley

dated September 29,1992 (3) Letter from D.J. Chrzanowski to Dr. T.E. Murley dated April 16,1993-1

! As a result of, and in preparation for, addressing Generic Letter 92-08,

Byron Station has been in the process of evaluating the station's Safe Shutdown Analysis as it applies to cabling protected by TSI Thermo-Lag 330-1 material. It i

is anticipated that this evaluation,in conjunction with detailed in-plant

, walkdowns, will result in an overall reduction in the quantity of fire barrier

! materials needed in order to be in compliance with 10CFR50, Appendix R. ,

I

During the evaluation process, several discrepancies have been identified

between the Safe Shutdown Analysis and the as-built installation of the Thermo-Lag fire barriers. In general, there are mismatches between what the Safe Shutdown Analysis states will be protected and what is actually protected in the plant. The following is a summary of the discrepancies identified listed by fire zone. Please not that Fire Zone 3.1-1 (U-1 Cable Tunnel)is an addition to the listing of fire zones provided in Byron Station's initial response to NRC Bulletin 92-01, dated July 23,1992.

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9401270027 940113 h 2

PDR ADOCK 05000454 PDR g

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Doc'ument Control Desk (2) - January 13,1994

FIRE ZONFs DISCREPANCY

3.1-1 Conduits not wrapped with a fire barrier. (Not listed in

{ 07/23/92 response) j 3.1-2 Conduit not wrapped with a fire barrier.

) 11.3-0 Conduits and a cable tray not wrapped with a fire barrier.

l 11.3-1 Cable tray and risers not wrapped with a fire barrier.

i 11.5-0 Conduits, trays, and a junction box not wrapped with a i fire barrier.

1 11.6-0 Cable riser not wrapped with a fire barrier. -

In each case, the appropriate compensatory action (one hour fire watches) ,

had been implemented for each discrepancy. These discrepancies pose a minimal

challenge to the station's ability to achieve and maintain the plant in a safe

shutdown condition. Each discrepancy has been documented and is being tracked

to resolution.

Please direct any questions regarding this response to D. Brindle ((815) 234-

. 5441 ext. 2280).

j Sincerely, 4f ? e

Martin J. Vonk i

Generic Issues Administrator Nuclear Regulatory Services f

cc: J. Martin, Regional Administrator-RIII J. Dyer, Directer of Directorate III-2 R. Assa, Byron Project Manager-NRR/PDIII-2 H. Peterson, Senior Resident Inspector (Byron) 4 i

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