ML19269D113

Submits Revision 11 to Fire Protection Rept

ML19269D113
Person / Time
Site:	Zimmer
Issue date:	02/23/1979
From:	Borgmann E CINCINNATI GAS & ELECTRIC CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 7902270338
Download: ML19269D113 (5)

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THE CINCINNATI GAS & ELECTRIC COMPANY e7T- ^2 CIN CINN ATI. OHIO 452o1 E. A. BORG MAN N v.cc passioc=r-s=oi=ta=w Docket No.30-358 February 23, 1979 Mr. Harold Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 RE: WM. H. ZIMMER NUCLEAR POWER STATION -

UNIT 1 - AMENDMENT 86 - SUBMITT71 OF REVISION 11 TO THE FIRE PROTECTION EVALUATION REPORT

Dear Mr. Denton:

The Cincinnati Gas & Electric Company on behalf of itself and as agent for Columbus and Southern Ohio Electric Company and The Dayton Power and Light Company hereby submits forty (40) copies of Revision 11 to the Fire Protection Evaluation Report for the Wm. H. Zimmer Nuclear Power Station - Unit 1 (ZPS-1) .

Very truly yours, THE CINCINNATI GAS & ELECTRIC COMPANY By O E. I BORGMANN Vice President - Engineering Services and Electric Production EAB: dew cc: Charles Bechhoefer State of Ohio )

Glenn O. Bright County of Hamilton)ss Frank F. Hooper Troy B. Conner, Jr. fworn to and subscribed before me James P. Fenstermaker this /[, # ' day of February, 1979.

Peter H. Forster William J. Moran . -

J. Robert Newlin William G. Porter, Jr. / i b<L< #

M> M[ 'Ww ,

James D. Flynn Nota ' Public / '

Thomas A. Lusbbers //

Stephen Schumacher MARY 0.'fTE"VG N: MF' "

John D. Woliver i

fly Corr.: . ,:

7902270338

ZPS-1 REVISION 11 FEBR'J ARY 1979 WM. H. ZIMMER POWER STATION INSTRUCTIONS FOR UPDATING YOUR FIRE PROTECTION EVALUATION REPORT To update your copy of the ZPS-1 Fire Protection Evaluation Report, remove and destroy the following pages and insert pages and figures as indicated.

REMOVE INSERT Page Q7-1 Page Q7-1 Page Q12-1 Page Q12-1 Page Q21-1 Page Q21-1 1

ZPS-1 REVISION 11 FEBRUARY 1979 QUESTION 7 (SECTION 8.4.2, DIVISION 1 SWITCHGEAR AREA)

" Describe the fire barriers to be provided for the Division 2 cable trays which pass through this area. Indicate the fire barrier rating to be specified."

RESPONSE

In the Division 1 switchgear area, the Division 2 (blue) redundant cable trays will be protected with Kaowool blanket material which has been qualified by test for the tray configuration to be protected. The 11 protective material will be of thickness as qualified by test to give a minimum 1-1/2-hour fire barrier.

7 Horizontal trays protected with the Kaowool blanket material will have the cables covered with a Kaowool blanket to given protection and retard propagation. Vertical trays (risers) will be euclosed with a Kaowool blanket material which has baen qualified to give a minimum 1-1/2 hour 11 fire barrier by test.

• This test titled, " Fire Protective Cable Tray Fire Test, September 1978 Through January 1979, for W7. H. Zimmer Nuclear Station,"

(Engineering Report Number 78-9-FP-1) will be included in the next Fire Protection Revision.

Q7-1

ZPS-1 REVISION 11 FEBRUARY 1979 QUESTION 12 (SECTION 8.4.9, LIFT TRUCK ROUTE INTO AUXILIARY BUILDING)

"a. Provide the results of an analysis of the effects on the redundant safety related cables and their associated systems of an exposure fire occurring in this area. Assume that the exposure fire is fueled by . combustibles that are normally carried through this area by the lift trucks. If a fire should occur in this area that could not be extinguished by the sprin-kler system or should the sprinkler system fail to operate, what are the consequences as they affect safe shutdown.

"b. Provide the design criteria for the sprinkler system to be provided for this area.

"c. This area is separated from the turbine building by a rated fire wall. A large opening is provided in this wall for the lift trucks to move between the turbine building and the reactor building. Describe the bulkhead type door, including the automatic or self-closing hardware to be provided and the fire rating of the door."

RESPONSE

a. Cable trays and cable bus for the Division 2 (blue) which cross this area will be protected by a 1-hour passive fire barrier in addition to the automatic sprinkler system. The cable trays will be protected 7 by Kaowool blanket material (see Question 7). The cable bus will be protected by an eaclosure of Kaowool blankets which have been qualified 8 11 by test.*

b. This area is protected by an automatic wet-pipe sprinkler system based on a design density of 0.30 gpm/ft2 for a total flow of 484 gpm.

The sprinkler water for this system is a separate supply from the 7 auxiliary building fire water supply header.

c. As shown on drawing M-426, Sheet 11, in Chapter 8, this area is separated from the other areas of the auxiliary building by fire rated walls. At this elevation the lift truck route through this auxiliary building is considered an extension of the turbine building for fire protection requirements.

The removable bulkhead wall is designed to protect safety-related areas from the design-basis flood as discussed in F3AR Subsection 2.4.1.4.

See paragraph three on Page QS-1 for a description of the water curtain wall at the turbine room entrance to the lift truck route. 8

• This test titled, " Fire Protective Cable Tray Fire Test, September 1978 Through January 1979, for Wm. H. Zimmer Nuclear Station,"

(Engineering Report Number 78-9-FP-1) will be included in the next Fire Proteccion Revision.

Q12-1

ZPS-1 REVISION 11 FEBRUARY 1979 QUESTION 21 (Sections 8.7.2 and 8.7.3, Fire Pump Rooms)

"The steel deck roof and supporting steel beams appear to be con-tinuous between the two pump rooms. Analyze the effcets of a fire in one pump room (i.e., rupture of the day tank in the diesel pump room) as it might affect the 'ntegrity of the wall / ceiling con-struction and possibly damage the other pump or control circuits, which could cause a loss of all fire fighting water."

RESPONSE

The structural steel beams in the diesel and motor-driven fire pump 11 rooms and the columns that support the roof are protected with a fire-resistant material. The fire resistant material has a 3-hour rating in accordance with one of the following tested assemblies: UL X-708, 7 UL N-712, X-716, X-719, X-727, and F.M. FC-206. A 3-hour rated 12-inch thick hollow concrete masenry unit firewall separates the two rooms.

Q21-1