ML20094L248

Submits Response to follow-up Request for Addl Info Re GL 92-08, Thermo-Lag 330-1 Fire Barriers

ML20094L248
Person / Time
Site:	Davis Besse
Issue date:	11/08/1995
From:	Stetz J CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
2339, GL-92-08, GL-92-8, TAC-M85542, NUDOCS 9511200128
Download: ML20094L248 (2)

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. 300 Modison Avenue John P. Stetr Toledo OH 43652 0001 Vice President Nuclear 419 249 2300 Davis-Beses i

Docket Number 50-346

-License Number NPF-3 Serial Number 2339 November 8, 1995 1

1 United States Nuclear Regulatory Commission  !

Document Control Desk Washington, D. C. 20555

Subject:

Response to Follow-up Request for Additional Information Regarding Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers" (TAC No. 85542)

Ladies and Gentlemen:

The Nuclear Regulatory Commission (NRC) issued Generic Letter 92-08 on December 17, 1992 (Toledo Edison Log Number 3916). Toledo Edison (TE) responded, as applicable for the Davis-Besse Nuclear Power Station (DBNPS), i on-April 16, 1993 (TE Serial Number 2132). The NRC issued subsequent I requests for additional information regarding Generic Letter 92-08 on December 21, 1993 (TE Log Number 4125), September 15, 1994 (TE Log Number 4398), and December 23,1994 (TE Log Number 4464) . Toledo Edison responded on February 11, 1994 (TE Serial Number 2201), December 8, 1994 (TE Serial 1 Number 2258), and March 22, 1995 (TE Serial Number 2282), respectively. In l addition, a comprehensive update of TE's current progress and plans regarding Thermo-Lag 330-1 fire barrier issues was provided on June 13, 1995 (TE Serial Number 2298).

On October 18, 1995, TE received a follow-up request for additional information regarding ampacity derating parameters for the installed Thermo-Lag fire barriers. Specifically, TE was requested to provide the NRC,-within 30 days of receipt of the request, a schedule for submitting a description of the anticipated analytical methodology, including typical calculations which will be used to determine the ampacity derating parameters for the Thermo-Lag fire barriers.

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• Docket Number 50-346 License Number NPF-3 Serial Number 2339 Page 2 ,

The June 13, 1995 letter described the various approaches under consideration to achieve Appendix R compliance for Thermo-Lag 330-1 fire barrier concerns, including raceway, radiant energy shields, and structural steel applications. The letter further stated that an approach would be established by June, 1996, and described activities which would be completed in order to support this schedule. As also stated in the letter, based on plant-specific calculations which used ampacity derating factors provided by the Thermo-Lag 330-1 manufacturer, ampacity derating is not expected to be a concern.for power cable circuits protected by Thermo-Lag 330-1 at DBNPS, even if significant adjustments to the ampacity derating factors previously provided by the vendor need to be applied.

Toledo Edison recognizes that ampacity derating is a consideration for whatever choice of approach is utilized to achieve Appendix R compliance, and that the plant-specific calculations will need to be revised. Toledo Edison will establish an approach for addressing the ampacity derating issue, in parallel with the overall Appendix R resolution strategy.

Accordingly, Toledo Edison. expects to be able to submit a description of the anticipated analytical methodology, including typical calculations which will be used to determine the ampacity derating parameters for the Thermo-Lag fire barriers, by June 30, 1996.

l l If you have any questions, please contact Peter W. Smith, acting Manager -

Regulatory Affairs, at (419) 249-2366.

Very truly yours, c A/M f-MKL/laj cc: L. L. Gundrum, NRC/NRR DB-1 Project Manager H. J. Miller, Regional Administrator, NRC Region III S. Stasek, NRC Region III, DB-1 Senior Resident Inspector Utility Radiological Safety Board

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