ML20084J646
| ML20084J646 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/08/1984 |
| From: | Jens W DETROIT EDISON CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| EF2-68-302, NUDOCS 8405100013 | |
| Download: ML20084J646 (3) | |
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W;yne H. J:n2 V(e Prssident Nuclear Operato1s Detroit Edison =000 Second Avenue =r-no 8. w84 2
EF2-68,302 Director of Nuclear Reactor Regulation Attention:
Mr. B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing U.S.
Nuclear Pegulatory Commission Washington, D.C.
20555
Dear Mr. Youngblood:
Reterence:
Fermi 2 NRC Docket No. 50-341 Sub]ect:
Additional Information Concerning Fire Protection Features of Control Room Panels In an April 3, 1984 meeting with Mr. Lynch of your staff and members of the Chemical Engineering Branch (Ferguson, Eberly, et al), Detroit Edison.commited to notify the NRC of Edison's decision relative to the ventilation arrangement and overall fire protection design of the Fermi 2 control room panels.
The Edison decision and its basis, indicating that no control room panel modifications are required and that the existing fire protection features for the panels are adequate, were provided to Mr. Ferguson and Mr.-Eberly in an Apr.il 17, 1984 telephone conversation.
Mr. Ferguson requested Detroit Edison document the basis.for this decision.
Accordingly this basis is provided below.
I.
The fire loading in these panels is light (see attached Figure).
PANEL #
TOTAL BTU EQUIVALENT FIRE 601 778,000
~12 min.
602 892,000 14 min.
808 557,000 09 min.
809-334,000 05 min.
810 446,000 07 min.
817 502,000 08 min.
The above'information-is based on cross linked poly-ethylene cable-insulation conservative estimate of cable containment per panel, and a conservative 50 square. foot floor area.
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Mr.'B. J. Youngblood EF2-68,302 Page 2 II.
Based upon the judgement of Edison's fire protection engineer,' we are convinced that 50-60% of the heat gen-erated zin a -panel would go.up and away from the adja-cent panels with the residual ~ heat being absorbed by the panel. ;It'is our engineering judgement that this heat release is 'not suf ficient to impair the function of any of the cables in the adjacent panels, since test data (3M test number-9380030601) for the Fermi 2 cables has~ uhown them to be free of faults up to 610*F.
Edison regards this test data to be equally applicable to unsheathed cables exposed to radiant heat, since the sheathing has a mimimal thermal insulating value.
Based on the aforementioned, the Fermi 2 control room panels are adequately designed and can easily accommodate the postulated panel fire without modification.
We must again state that the aralyzed case probably will not exist because:
- 1) the panels have two (2) ionization detectors each; 2) the control room.is continuously manned by well trained operators; and 3) the panels contain only low energy cables, such'as control, indication,'and low power circuitry
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for control room instrumentation.
If.you should:have any questions,1please-contact Mr.
O. Keener Earle,'(313) 586-4211.-
Sincerely, cc:
Mr.
P.
M. Byron Mr.
M.
D.
Lynch
,(
Mr.
R.
Eberly (NRC-ChEB)
USNRC, Document Control Deski Washington, D.C.
20555 l
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