NRC-95-0058, Responds to NRC ,Confirmimg That W/Listed Differences,Mods Described in Util Re Removal, Replacement & Reclassification of Thermo-Lag 300-1 Fire Barriers at Facility Implemented,Per GL 92-08

Responds to NRC ,Confirmimg That W/Listed Differences,Mods Described in Util Re Removal, Replacement & Reclassification of Thermo-Lag 300-1 Fire Barriers at Facility Implemented,Per GL 92-08

ML20085G800
Person / Time
Site:	Fermi
Issue date:	06/15/1995
From:	Gipson D DETROIT EDISON CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
CON-NRC-95-0058, CON-NRC-95-58 GL-92-08, GL-92-8, NUDOCS 9506200369
Download: ML20085G800 (2)

Text

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. Dzuglse R.hipson e

Senior Vice President i

Nuclear Generation

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Edis' on. 6400 North Duie Highway.

l-(313) 586-5249 i

June 15,.1995 NRC-95 0058 -

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l U. S. Nuclear Regulatory Co., a ission -

Attn: Document Contro' De3i:

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Washington, D. C. 205,i5 l-References; l)- Fermi 2 1

NRC Docket No.50-34i L

NRC Licen'se No, NPF-43

2) ~ NRC Generic Letter 92-08, "Thermo-Lag 330-1 Fire Barriers," dated December 17.1992.-

3)

Detroit Edison Letter to NRC, " Detroit Edison Response to NRC Generic Letter 92-08," NRC-93-0043, dated April 8, l

1993 i

4)

NRC Letter to Detroit Edison," Request for Additional Information Regarding Generic Letter 92-08. Thermo-Lag.

330-1 Fire Barriers," dated December 22,1993 5)

Detroit Edis an Letter to NRC, ' Detroit Edison Response to l

NRC Request for A'dditional Information Regarding Generic Letter 92-08," NRC-94-0011, dated February 11,1994 6)

NRC Letter to Detroit Edison," Response to Request for Additional Information Regarding Use of Thermo-Lag 330-1 at Fermi 2 (TAC No. M85550), dated April 18c 1995 '

Subject Confirmation of Moditications Regarding Removal, Replacement.

and Reclassification of Thermo-Lag 330-1 Fire Barriers 'at Fermi 2 The purpose of this letter is to protide Detroit Edison's response to the NRC l

letter of April 18,1995 (Reference 6). As requested in that letter, Detroit Edison confirms that, with the following differences, the modifications described in the Detroit Edison letter dated Febmary 11,1994 (Reference 5) have been

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implemented during the last refueling outage (RFO4):

9506200369 950615 I

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USNRC June 15,1995

. NRC-95-0058 Page 2 4

Cable Trav Enclosure'for Cable Trays IC-037 and 1P1070'. CCHVAC -

Area: El. 677' - 6" -

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Subsequent to Reference 5, this enclosure was replaced with an :

approved one hour fire rated assembly instead 'of the stated 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> rated assembly, to be consistent with the.one hour divisional' separation in~this area.

Relav Room Stairwell Enclosure in the Northeast Corner of the Relav 4

Room on El. 613' - 6" Subsequent to' Reference 5, an approved 3 hour3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> fire rated barrier was-installed on the underside ceiling of the stairwell, instead of the stated 3 -

hour fire rated cementitious mixture for~ ease ofinstallation.

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' All documentation related to the resolution of the concerns with Thermo-Lag fire barrier systems at Fermi 2 are being retained for future NRC inspectionsJThis '

documentation also includes an evaluation of the amp'acity impact of Thermo-Lag.

material on cable life for previous operation of safety related circuits.

This letter also satisfies the confirmation request of Generic Letter 92-08 (Reference 2). No new commitments are being made in this letter.

Ifyou have any questions, please contact Mr Girija S. Shukla at (313) 586-4270..

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1 Sincerely, -

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L cc: T. G. Colburn J. B. Martin M. P. Phillips A. Vegel L

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