ML20004A425
| ML20004A425 | |
| Person / Time | |
|---|---|
| Site: | Zimmer |
| Issue date: | 05/14/1981 |
| From: | Borgmann E CINCINNATI GAS & ELECTRIC CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8105150287 | |
| Download: ML20004A425 (4) | |
Text
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-j)Iwd-THE CINCINNATI GAS & ELECTRIC COMPANY set -
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/h E. A. BoRGMAN N f N" 4 g
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Docket No.50-35e 4 ray 1 4393j g May 14, 1981 Mr. Harold Denton, Director .
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Office of Nuclear Reactor Regulation '>. 6
~ ZPS- REVISION 18' t
MAY- 1981 '
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, j remove and destroy the follawing pages and. insert pages and figures-as indicated.
REMOVE INSERT Page Q4-1 Page Q4-l' Figure Q4-1 -Figure Q4-1 O'
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P00R 011GINAL
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ZPS-1. -
ISI N 18 i
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r QUESTION 4 (OUTSIDE AUXILIARY BUILDING)
"A fire in the main auxiliary transformer or the reserve auxiliary.
f transformer outside at the southeast- corner of the ' auxiliary building i would create excessive smoke. Describe how the smoke from this postulated fire, or any other fire on the south or' east side of the I building, will;be prevented from entering the air intake plehums ;
(for the diesel-generator rooms or other areas) which are located
~
i on the south wall of *.he auxiliary building directly above the l transformers, and thereby activating the ionization detectors which ;
will discharge CO2 into the diesel-generator rooms."
r i
dESPONSE
- Smoke from an outside s rce, such as a transformer fire, could possibly I enter the air intake louvers located in the auxiliary building wall at .i column row 15. The ventilation filters will remove 50% of all particles ;
in the 3 micron range and 100% of particles in the 10-micron range; !
therefon , the major amount of smoke particles would be removed by the ;
ventilation system filters. Additional filtration is available when '
the evaporative cooling units are operating in the summer, j The diesel-generator rooms are normally ventilated and maintained at a !
slight positive pressure by the turbine building ventilation system. !
The diesel-generator air intake fr operate only when a diesel generator t is operating. The CO 2systems in t . diesel-generator rooms are actuated r by fixed temperature detectors, thus the presence of smoke in the diesel- :
generator rooms will not cause an inadvertent discharge of the C0 7 ;
systems. !
The actuation of the heat detectors in the diesel-generator rooms init-7 iates an alarm both Iccally and in the' control roon prior to actuation of the CO fire pr te:ti n system.
2 l 17 At the south end of the auxiliary building, a sheet metal enclosure is provided. Its main purpose is to provide air from the northerly direction !
and 1%it DEG fumes and smoke from entering the south minimum outside-air 18 -
intake of the control room HVAC snd Division 2 diesel ventilation system. I I
Since Division 1 and Division 2 diesels provide redundant power supplies to saf- Nt down the plant, the ventilation and combustion air i intakr *a
~
Division 2 diesel is routed to the auxiliary building roof l (elevs.<'n S' f t 7 in.) to provide a separate and diverse intake for 15 i this c > o .ompared to Division 1 (and 3) intakes. The separate and _[
diverse. takes, therefore, provide protection from concentrated ;
combustion products produced by a fire from the main transformer located (
south of the diesel building at grade (elevatior 520 ft 0 in.). [
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REVISION 18 {
,. MAY 1981 TURBINE O DIESEL GENERATOR x BUILDINo i j
(DIV. 2 ) REACTOR l AND BUILDING 1 AUXILIARY BUILDING AUXILIARY ,
AIR-INTAKE BUILDING /
ENCLOSURE .-'
P' DIESEL GENERATOR DIV.2)
', m,/ AIR4 ROOF INTAKE OPENIN s.
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- H.V.AC.
AIR-INTAKE
/ l LOUVERS -
% DIESEL -
/ GENERATOR (DIVh. I 8 3) l / AIR-INTAKE LOUVERS O '
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Noiesc' eesea*Toa coiv. 2)
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/' AIR-INTAKE LOUVERS (SEALED CLOSED)
DIESEL GENERATOR
/ /
BUILDING '
l I DIESEL GENERATOR y EXHAUSTS AUXILIARY \ MAIN POWER RESERVE AUXILIARY l TRANSFORMER TRANSFORMER TRANSFORMER !SOMETRIC i h[g [ll llll MI'RNbNIIIIIIIIIIIllI i ENCLOSUREm %f$ DlWT / 018.INTAKg ,OPNG 4 , , ,
l:8 VENTILATION EQUIPMENT ROOM EL. 567 '- 5" *
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n f"5 SWITCHGEAR ROOM CONTROL ROOM EL. 54 6'-O" f '
- - EL. 520'-0"
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\ WM. H. ZIMMER NUCLEAR POWER STATION. UNIT 1 0 '- '
DIESEL lM l r>ac eao'cor'oa ateoar GENERATOR ROOM FIGURE Q4-1 SECTION ISOMETRIC VIEW 0F DIVISION 2 ,
DIESEL AIR INTAKE c t