ML20043C916

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Forwards Response to 880828 Request for Addl Info Re Control Room Ventilation Sys.Appropriate Pages from Fire Protection Plan Encl.W/Four Oversize Drawings
ML20043C916
Person / Time
Site: Zion  File:ZionSolutions icon.png
Issue date: 05/21/1990
From: Chrzanowski R
COMMONWEALTH EDISON CO.
To: Murley T
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation
Shared Package
ML20043C917 List:
References
NUDOCS 9006060347
Download: ML20043C916 (13)
v • d • e


Text

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_..g, Commonwealth Edison

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Zbn Generating Station

  • Shiloh BlWI. & Lake Mchigan May 21, 1990 Zion. Illinois 60099 Telephone 708 / 746-2084 j

Dr. Thomas E. Murley, Director Office.of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555 Attn. Document Control Desk

Subject:

Zion Station Units I and 2 Response to Request for Information l.

Control Room Ventilation System j

ERC Docket Nos. 50-295 and 50-304

Dear Dr. Murley:

During a teleconference held on August 28, 1988, members of your staff requested the following information from Zion Station.

o A copy of the October 30, 1987, Zion Station Control Room Ventilation design drawing A copy of the July 26, 1984, Zion Station M-81 drawing regarding the Control Room Ventilation system An explanation of'how smoke would be purged from the l

l Control Room

(

l During a recent Region III Inspection to close the Control Room Ventilation issue, the submittal that provided this information was unable.to o

be located.

The Attachments to this letter provide a copy of the requested information.

If any additional information is required, please direct the i.

requests to this office.

Very truly yours, M

R. A.

rzanows l

Nuclear Lice ing Administrator cc:

C. Patel - NRR l

Region III Office Zion Resident Inspector

-R. Landsman - RIII 9006060347 900521 O

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Request:

Describe the method used to remove smoke from the Zion Station Main Control Room.

Answer:

In the Zion Station Fire Plan, in the section titled FIRE.

ZONE 2.0-0, MAIN CONTROL ROOM, the emergency description of-the ventilation system is described as follows:

In the event of high radiation in the outside air supply, make-up air from the Turbine Building will be supplied by charcoal unit fans.

If necessary, air is routed through HEPA and charcoal filters.

The Control Room HVAC system is protected by a smoke detector system that automatically routes smoke-filled air through charcoal-filters.

Tha following description.is suggested for the removal of smoke from the main control room:

Use portable smoke ejectors with six (6) 20' sections of flexible ducting.

Remove to Turbine Main floor elevation 642'-0", where smoke and fire gases may be directed to teh outside through window panels.

Supply ventilation must-be at least equal to portable exhaust ventilation in CFM for proper smoke removal.

Attached are the appropriate pages from the Fire Protection Plan.

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6 FIRE ZONE 2.0-0 MAIN CONTROL ROOM-

'N AUXILIARY BUILDING EL 642'-0"

- NOMO SME --

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e 4.01 11.7 4 4.02 COMPUTER ROOM AUK 9tDG CHARCOAL FILTER / VENT SYSTEM AREA COMPUTER ROOM J

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18.8-1 i'*

i CONTROL ROOM OFFICES l,

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I LEGEND.

SAFE SHUTDOWN 4

SOUND POWERED PHONE WHEEL ED CAR 80N Sp l

DeOxeDE ExTWeGUISHER h EMERGENCY LIGHisNG b

FIRE BRsGADE LOCMER l

CARSON D'OxeDE l

HvAC PENETRATION WITH EXTeseGutSHE R TELEPHONE T

FARE DAMPER i.

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DRYCHEMICAL ExfleeGueSHER b.

WATLR HOSE ST ATION HALON E N1sNGUtSHE R

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ELECTRICAL EQUIPMENT 2 480V

- POWER SUPPLY EQUIPMENT NAME bus /Mcc COM P. #

LOCATION e NONE e

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e SAFE SHUTDOWN COMPONENTS PRESENT BY SYSTEM

  • INSTRUMENTATION - MS, PMS, RHR
  • VALVES NONE FIRE HAZARDS PRESENT
  • CLASS A CABLE INSULATION, PAPER, DUCT INSULATION, RUBBER COVE BASE
  • CLASS B -

NONE e OTHER

- NONE I

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FIRE ZONE 2.0-0 MAIN CONTROL ROOM AUXILIARY BUILDING EL 642'-0" 6

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FIRE ZONE.2 0-O' 0

MAIN CONTROL ROOM III. ACCESS TO ZONE DESCRIPTION A.

PRIMARY:

Proceed west from the fire brigade locker and enter the Control Room offices and. kitchen area via the doors:near Col'. G25.

Enter the Main Control Room by the first set of double fire. doors on the right.

B.

ALTERNATE:

Proceed north from the fire brigade locker and enter the Shift Engineer's Office corridor via the doors near Col.

G15.

Enter the Main. Control Room by the double fire doors on the left after enterin Shift Engineer's Office. g the corridor by the window of the C.

RADIATION CONDITIONS NORMAL OPERATIONS:

None l

D.

EGRESS W/ LIFE SAFETY CONCERNS:

There are five (5) entries and exits from the Main Control Room:

two leading west into the Unit 1 or Unit 2 Computer Rooms; one leading north into the TSC/ Shift Engineer's I

Office; and the two entry exits listed in the normal and alternate access descriptions in A

and B of this section.

The Main Control Room is a

normally occupied. area.

Rescue operations should be conducted prior to fighting the fire.

Injured personnel treatment and transportation shall be in-accordance with station procedures.

L l

l 18-JUN-85 08:18:29 Revision:

0 Page 4 of 11

i-c' FIRE ZONE 2c0-0

..E' MAIN CONTROL ROOM IV.

CRITICAL EQUIPMENT / COMPONENTS IN ZONE

.A._

SAFE SHUTDOWN RELATED:

POWER COMPARTMENT POWER SUPPLY EQUIPMENT SUPPLY NO.

LOCATION Man. Ind. Cont. Atm.

N/A Dump Vlv. SG A (MCB)

(SSR) 1PHC-516C

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Pressurizer Level N/A Indicator (MCB) (SSR) 1LI-459A ILI-460A ILI-461

' Steam Generator A N/A Level Indicator (SSR) 1LI-501 Steam Generator D N/A Level Indicator (SSR)

ILI-503 l

Source Range N/A

(-

LMonitor Indicator (SSR)

IN-0031 IN-0032

-RCS Pressure N/A Indicator (MCB) (SSR) l L

IPI-403 i

1PI-403A L

1 i

n 18-JUN-85 Revision:

0 08:18:29 Page 5 of 11

1

. i FIRE ZONE 2.0-0 MAIN CONTROL ROOM l

SG A Pressure N/A Indicator-(MCB) (SSR) 1PI-514A 1PI-515A 1PI-516A SG D Pressure'

.N/A Indicator (MCB) (SSR) 1PI-534A 1PI-535A 1PI-536A RCS Pressure.

N/A Recorder (MCB) (SSR)

IPR-403 RCS Loop A Th N/A l

Recorder (Pen 1)

(MCB) (SSR)

L ITR-413-1 RCS Loop A Tc N/A i

Recorder (Pen 2)

E (MCB) (SSR) 1TR-413-2 l

l RCS Loop D Th N/A Recorder (Pen 1)

(MCB) (SSR)

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l ITR-433 RCS Loop D Tc N/A Recorder (Pen 2)

(MCB) (SSR)

ITR-433-2 p

-RHR Pump 1A N/A l

Flow Hand Cont.

(MCB) (SSR)

L 1 HIC-606 L

1 18-JUN-85 Revision:

0 08:18:29 Page 6 of 11

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FIRE ZONE 2 0-O' 0

MAIN' CONTROL ROOM ~

,.e RHR' Pump 1B N/A Flow Hand Cont.

(MCB) (SSR)-

I lHIC-607 RHR Heat Exch.

N/A Bypass Cont.

(MCB) (SSR) 1 HIC-618 I

5 Man.-Ind. Cont. Atm.

N/A Dump)Viv. SG A (MCB)

(SSR 2PHC-516C Pressurizer Level N/A Indicator (MCB) (SSR) 2LI-459A 2LI-460A j

2LI-461 Steam Geaerator A N/A L

Level Indicator-(SSR) 2LI-501 Steam Generator D N/A Level. Indicator (SSR) 2LI-503 l

Source Range N/A Monitor-Indicator (SSR)-

2N-0031 i

' 2N-0032 g

RCE: Pressure N/A L

Indicator (MCB) (SSR) l: t:

2PI-403' 2PI-403A i

18-JUN-85 Revision:

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s FIRE ZONE 300-0 MAIN CONTROL ROOM

'SG A Pressure N/A

' Indicator (MCB) (SSR) 2PI-514A 2PI-515A 2PI-516A SG D Pressure.

N/A Indicator (MCB) (SSR) 2PI-534A 2PI-535A 2PI-536A RCS Pressure N/A Recorder (MCB) (SSR) 2PR-403 RCS Loop A Th N/A Recorder (Pen 1)

(MCB) (SSR) 2TR-413-1

.RCS Loop A Tc N/A Recorder (Pen 2)

(MCB) (SSR) 2TR-413-2 RCS Loop D Th N/A Recorder (Pen 1)

(MCB)-(SSR)-

2TR-433-1 RCS Loop D Tc N/A Recorder (Pen 2)

(MCB) (SSR) 2TR-433-2 RHR Pump 1A N/A Flow Hand. Cont.

(MCB) (SSR) 2 HIC-606 18-JUN-85 Revision:

0 08:18:29 Page 8 of 11

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L FIRE ZONE 200-0 j.,>

MAZN CONTROL ROOM L.,

RHR Pump 2B N/A Flow Hand Cont.

(MCB) (SSR) 2 HIC-607 RHR Heat Exch.

N/A Bypass Cont.

(MCB) (SSR) 2 HIC-618 B.

SAFETY RELATED:

POWER COMPARTMENT POWER SUPPLY

-EQUIPMENT SUPPLY NO.

LOCATION l

Rad Monitoring Low-Voltage BOP i

ICB073 Rad Monitoring Low Voltage BOP 2CB073 C.

OTHER MAJOR EQUIPMENT:

l POWER COMPARTMENT POWER SUPPLY EQUIPMENT SUPPLY NO.

LOCATION None l

i V.

VENTILATION - (See System Operating Instruction SOI-71) 1 A.

NORMAL:

i The Control Room is maintained at a

positive operating pressure.

Clean outside air is drawn through a missile i

protected wall penetration (protected by a

rated fire damper).

One of two air handling units operate, with the other on standby.

Air is recirculated-by return air fans and mixed with outside air before being routed back to the room.

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18-JUN-85 Revision:

0 08:18:29 Page 9 of 11

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FIRE ZONE 200-0 i

MAIN CONTROL ROOM EQUIPMENT POWER BREAKER POWER SUPPLY UNIT / COMPONENT SUPPLY NO.

LOCATION Air Handling MCC 1381B F1 Unit l' Diesel Unit 0A Gen. lA SWGR OPV009 Room El, 617'-0" Air Handling MCC 2391 D6 Unit'2 Diesel Unit OB Gen. 2B SWGR OPV010 Room El, 617'-0" t

Return Air MCC 1381B H4 Unit 1 Diesel Fan'OA Gen. 1A SWGR OPV011 Room El. 617'-0" Return Air MCC 2391 E2 Unit 2 Diesel Fan OB Gen. 28 SWGR OPV012 Room El, 617'-0" Refrigeration Bus 138 3B

-Unit 1 Diesel Unit 0A Gen.-1A SWGR Room El. 617'-0" Refrigeration-Bus 239 SC Unit 2 Diesel Unit OB Gen. 2B SWGR Room El. 617'-0" i

B.

EMERGENCY:

In the event of high radiation in the outside air supply, make-up air from the Turbine Building will be supplied by i

charcoal unit fans.

If necessary, air is routed through HEPA and charcoal filters.

The Control Room HVAC system is protected' by a smoke detection system that ' automatically routes smoke-filled air-through charcoal filters.

EQUIPMENT POWER BREAKER POWER SUPPLY UNIT / COMPONENT SUPPLY NO.

,LG ATION L

Control Room MCC 1381B F2 Unit 1 Diesel Charcoal Unit Gen. lA SWGR Fan OA Room El. 617'-0" l

, JUN-85 Revision:

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08:18:29 Page 10 of 11

FIRE ZONE 2.0-0

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MA2N CONTROL ROOM t

C.

SUGGESTED SMOKE REMOVAL PRACTICES:

Portable smoke ejector with six (6).20' sections of flexible ducting.

Remove to Turbine Main Floor elevation 642'-0",

where smoke and ' fire gases may-be directed to the outside through window panels.

Supply ventilation must be at least equal to portable exhaust ventilation-in CFM for proper smoke removal.

WARNING:

IF MORE THAN FOUR (4) SECTIONS OF FLEX DUCTING ARE _USED, ADDITIONAL SMOKE EJECTORS MUST BE USED IN RELAY.

VI.

SPECIFIC ZONE MAZARDS/ COMBUSTIBLE LOADING o

Cable insulation, 19,636 lbs.

o Duct insulation, 1,500 lbs, o

Rubber cove base, 101 lbs.

VII.

SUGGESTED GUIDELINES FOR FIRE ATTACK /BEST EXTINGUISHMENT Portable

Halon, cog or dry chemical extinguishers are recommended for initial attack while deenergizing or securing power source.

Water may be used without restrictions;

however, care should be taken in the-application of water to minimize damage to low power electrical circuits.

VIII. DESIGN FIRE PROPAGATION CONTROL The Control Room is constructed of reinforced concrete with exposed steel supporting the roof.

Columns embedded in the east wall have one flange exposed to the zone.

Access doors are all fire-rated (although those to the Shift Engineer's Office are normally blocked open),

and vent ducts are dampered.

A

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