ML20094D211

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Forwards Analysis of Thermal Response of Junction Between Partially Protected Member Which Protrudes Thermo-Lag 330 Fire Barrier & Cable Tray & Summaries of Test Results for Configurations of 3M Fire Protection Envelope
ML20094D211
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 08/04/1984
From: Jens W
DETROIT EDISON CO.
To: Youngblood B
Office of Nuclear Reactor Regulation
Shared Package
ML20094D217 List:
References
EF2-69-218, NUDOCS 8408080299
Download: ML20094D211 (3)


Text

'i; s 5' Coyne H. Jus I

Mce Prewdert tlaticar operaNns Forme 2 6400 North Dnie Hghway

  • [$Ni7 *" August 4, 1984
BF2-69,218 i

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Director of Nuclear Reactor Regulation Attention: Mr. B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U.S. Nuclear Regalatory Commission Washington, D. C. 20555

Dear Mr. Youngblood:

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References (1) Fermi 2 NRC Docket No. 50-341 4

(2) Underwriters Laboratories, Inc.

File R10125, Project 82NK21937, i " Report on Electrical Circuit Materials", October 19, 1983 (3) Detroit Edison to NRC Letter, " Submittal of Deviations from Staff Interpretations of Fire Protection Features in 10CFR50, Appendix R and Justification",

E P2-72 717, dated August 3, 1984

Subject:

Transmittal of Fire Protection Information In accordance with an agreement made in an April 1, 1984 meeting between Edison and NRC personnel, Edison is hereby providing the following information in support of the present Fermi 2 fire protection position:

1. TSI Technical Note 42584, " Analysis of the Thermal Response of the Junction Between a Partially Protected Member'Which Protrudes the Thermo-Lag 330 Fire Barrier and a Cable Tray", April, 1984.
2. Summaries of Test Results for Fermi 2 Configurations of the 3M Fire Protective Envelope (5 summaries).

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0408080299 84 4  !

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Mr. B. J . Youngblood:

August 4,1984 EF2-69,218 Page 2 The TSI report is being provided in support of the Fermi 2 design of fire stops being used for " cross-over" cables in the relay room stairwell as discussed in the meeting with your staff in June 1983. The configuration in the analysis (square tube not filled with silicone) is considered more conservative than'the Fermi 2 configuration of conduit filled with silicone.

The reference (2) UL report and additional information concerning the 3M fire protective envelope design were previously provided to your staff at the April, 1984 meeting. . The 3M fire. protective envelope is the preferred design for fire barriers used in the plant for cable protection, outside of the relay room stairwell. Since the

, reference (2) report is complex and many of the configura-l tions discussed in the report are not applicable to Fermi 2, l

the five summaries are provided to outline and reference the information and configurations which are applicable. The

! summaries provide the information relevant to all the basic configurations of the 3M fire protective envelope design at Fermi 2. The justification that the 3M fire protective envelope provides adequate one (1) hour protection is l

contained in reference (3).

! If you have any questions, please contact Mr. Keener Earle at (313) 586- 4211.

l Sincerely,

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cca Mr. P. M. Byron

  • Mr. M. D. Lynch
  • Mr. R. Eberly*

USNRC, Document Control Desk

  • With Attachment l

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The attached' analysis demonstrates that_the crossover protection used at Fermi 2 in the relay room stairwell area provides th,e required protection.

The crossovers protrude through the T.S.I. three (3) hour barrier.on cable tray 1K-034. The analysis concludes that by protecting the protruding-member 18 inches from the barrier interface, in all directions; the ciaximum temperature attained.at the junction at-the end of the three (3) hour fire exposure is 295'F. This is true as indicated _in the analysis,.even if the unprotected conduit outside the'18 inches of_ protected surface was infinite. Additionally, the conduit is sealed with a three (3) hour fire rated stop.

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