ML20106G122

Evaluation of Fire Detection Placement at Fermi 2

ML20106G122
Person / Time
Site:	Fermi
Issue date:	01/31/1985
From:	Olaughlin R PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20106G081	List: ML20106G079 ML20106G101 ML20106G122 ML20106G132
References
NUDOCS 8502140230
Download: ML20106G122 (11)

Text

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PROFESSIONAL LOWS CONTROL, INC.

EVALUATION OF FIRE DETECTION PLACEMENT AT FERMI 2 DETROIT EDIS0N C0.

Date Submitted: January 31, 1985 Prepared by: Robert J. 0'Laughlin, P.E., CSP Senior Fire Protection Engineer Professional Loss Control, Inc.

8502140230 850204 PDR ADOCK 05000341 F PDR -

P. O. Dox 446

• Oak Ridge. Tennessec 37831 e (615) 482-3541

O O TABLE OF CONTENTS Subject Page 1.0 Introduction.............................................. 1 2.0 Control Room Complex...................................... 1 2 .1 F i r e A r e a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.2 Fire Hazards.......................................... 1 2.3 Safe Shut Down Equipment.............................. 2 2.4 Fire Protection....................................... 2 2.5 Conclusion............................................ 2 3.0 Torus Area................................................ 3 3 .1 F i re A r e a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 . 2 F i r e H a z a rd s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.3 Fire Protection....................................... 3 3.4 Safe Shut Down Equipment.............................. 3 3.5 Conclusion............................................ 4  ;

4.0 Refueling Floor - 5th Floor of the Reactor Building....... 4 4.1 Fire Area ............................................ 4 4 . 2 F i r e H a z a rd s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4.3 Safe Shut Down Equipment.............................. 5 4.4 Fire Protection....................................... 5 4.5 Conclusion............................................ 5

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.. 1.0 Introduction This report reviews the fire detectors placement in three specific nuclear safety related areas:

Control Room Complex Torus, f geactor Mr ef the E '?ieri Building Refueling Floor - 5th floor The following sections will evaluate the need for fire detection in these three areas with specific emphasis on:

The fire area Fire hazards Safety related equipment Fire protection 2.0 Control Room Complex 2.1 Fire Area The control room is separated froin the reactor building and tur-bine building by 3. hour fire resistance wall and floor / ceiling assemblies. The control room has a drop ceiling approximately 22 ft above the floor. The main ceiling is approximately 32 ft above this floor. The stairwell in the northeast corner of the room is enclosed by two hour fire resistive construction.

The ventilation air is supplied by the control center HVAC sys-tem. Supply and return ducts are provided with fire dampers at the three hour barriers.

The exterior finish material within the control room has a maxi-mum flame spread of 25, smoke developed of 50 and fuel contribu-tion of 50. The control room contains no carpet.

2.2 Fire Hazards Combustibles in this area consist of electrical cable insulation, paper and plastics. The combustible loading within the room is less than 10 lb/ft2. No flammable or combustible liquids are used in this area except very small quantities permitted by procedures.

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O O The amount of combustible material above the drop ceiling is

. negligible. The combustible loading is less than 1 lb/ft . 2 2.3 Safe Shutdown Equipment The control room contains the control and instruments necessary for safe shutdown.

2.4 Fire Protection The control room is manned all of the time. The computer room (a peripheral room) is protected by an automated Halon 1301 fi re suppression system. This system protects the computer room and the computer room underfloor area. A manual hose station is lo-cated just outside the south wall of the control room. Portable fire extinguishers (Halon and CO2 ) are located within the control room.

Ionization smoke detectors are located inside each of the control board panels. Smoke detectors are provided above the drop ceil-ing but do not conform to the spacing requirements of NFPA 72E (beam pocket criteria).

The kitchen room is provided with a spot thermal detector.

2.5 Conclusion The fire detection capability within the control room complex is adequate to detect incipient smoldering and flaming mode fires.

This is based upon:

The control room is manned all of the time.

The control room panels are provided with smoke detectors.

The amount of combustibles above the drop ceiling is negligible (<1 lb/ft )2 Therefore, placing additional detectors above the drop ceiling to conform with the spacing requirements in NFPA 72E will not sig-

.nificantly enhance the fire protection for the control room.

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O O 3.0 Torus

. 3.1 Fire Area The torus area is an octagonally shape room in the reactor build-ing which extends from Elev. 540'-0" up to Elev. 583'-6". The room contains piping, cabling and the suppression pool (torus) .

The walls and floor are constructed of reinforced concrete. The ceiling assembly is constructed of reinforced concrete over steel beams.

The ventilation in the torus area is provided by conditioned air from the four basement corner rooms. The exhaust air is ducted to the main exhaust system.

3.2 Fire Hazards The combustible material in this area consists of electrical cable insulation. The total combustible loading for the torus area is 19,000 BTU /ft 2. No in-situ flammable or combustible liquids are located in the torus area.

EPRI tests have demonstrated that electrical shorts will not pro-pagate a fire in this type of insulation material. The EPR/Hy-palon jacketed cable has a high degree of fire retardance.

3.3 Safe Shutdown Equipment The torus area contains Division I and 11 shutdown cables. The torus room conforms to the requirements of Appendix R except for filed deviations.

3.4 Fire Protection The torus area has an automatic sprinkler system that protects the entire area. This system will protect any exposed structure steel from thermal degradation during any fire condition. The water flow alarm for the sprinkler system transmits signals to the control room upon actuation.

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O O Fire detection in the torus area consists of 8 ionization smoke

. . detectors which are located adjacent to the exhaust duct grills.

These detectors do not conform to the spacing requirements of NFPA 72E (beam pocket criteria).

3.5 Conclusion The fire protection in the torus area is adequate to protect the safe shutdown capability of this area. The automatic sprinkler system will protect at least one of the functionally redundant systems which is needed for safe shutdown.

Additional fire detectors will not enhance to a sufficient degree the fire protection provided by the current configuration based upon:

Light combustible load (19,000 BTU /ft2)

Complete automatic sprinkler protection High ceiling height (approximately 43 ft - will not detect a smoldering fire due to the lack of a thermal plume).

Spatial separation of functionally redundant equipment.

EPR/Hypalon cable insulation.

No in-situ flammable or combustible liquids in the area.

4.0 Refueling Floor - 5th Floor of Reactor Building 4.1 Fire Area The refueling floor (El. 684'-6") of the reactor building is en-closed by outside walls on the north, south and west sides; the east wall separates the reactor building from the auxiliary

-building. The east wall is constructed of reinforced concrete up to Elev. 701' and provides a three hour fire resistance barrier between this area and the auxiliary building.

The roof consists of steel frame and built-up roof deck conform-ing to Factory Mutual Class 1 roof construction. The ceiling height is approximately 51 ft. The total volume of the room is 911,000 ft 3, 4

O O The refueling floor contains the fuel storage pool, the dryer /

separator pool, and the decontamination area.

l The HVAC system supplies air directly thorough ducts to the floor area. Air is exhausted from these areas through ducts to the reactor / auxiliary building ventilation system.

4.2 Fire Hazards The types of combustibles on the refueling floor primarily con-sists of lubricating oil for the gear box in the fuel handling crane. The estimated total heat of combustion is 12,000,000 BTU with a combustible loading of 600 BTU /ft2 ,

Transit combustibles will be in the area during refueling peri-ods.

4.3 Safe Shutdown Equipment The refueling floor contains n_o,osafe shutdown equipment.

4.4 Fire Protection Fire suppression equipment consists of four (4) manual hose sta-tions and portable fire extinguishers (dry chemical and water types).

Ionization smoke detectors (8) are located at ceiling level but l

do not conform to the spacing rgquirements of NFPA 72E (beam pocket criteria).

4.5 Conclusion The fire protection provided on the refueling floor is capable of preventing the spread of fire from the refueling floor to areas containing safe shutdown equipment.

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O Additional detectors will not enhance the fire protection to a significant degree based upon:

A low combustible loading (<1 lb/ft2)

No in-situ flammable liquids in the area A high ceiling height (51 ft) - smoldering fires will not be detected at this height. A significant thermal fire plume would have to be developed in a fire to cause the fire by-products to rise to the detectors on the ceiling.

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DEVIATION REQUEST FOR FIRE DETECTOR REPLACEMENT

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4 FOR 1

REACTOR BUILDING BASEMENT CORNER ROOMS

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PERFORMED.BY DETROIT EDISON I

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r O O 1.0 Basement Corner Rooms 1.1 Fire Zones The basement Corner Rooms consist of four unconnected triangular shaped rooms, one of which is located in each corner of the Reactor Building.

Each room is comprised of two floors, one at elevation 540', the other at elevation 562'. An open stairwell in each room connects each floor.

Walls and floors are reinforced concrete with unprotected openings. Specifically this evaluation is for the 562' elevations.

1.2 Fire Hazards At the 562' elevation, combustibles consist of electrical cable insulation. Each room has 2 or 3 trays which run along the wall separating the Corner Room from the Torus Room. The trays are lightly: loaded (less than 50% visual) and are located approximately 15 ft. off the floor. Each room has instrument racks located in it. No other fixed combustibles are present.

1.3 Safe Shutdown Equipment

' Each room contains only one functionally redundant division of Appendix R shutdown equipment and cables.-

1.4- Fire Protection Fire detection is provided at each level. The basement level (562' elevation) detector does-not meet the spacing requirements of NFPA 72E when-evaluated against the beam pocket criteria con-tained within this standard.. Additionally, the-detector is' located on the beam approximately 24

' inches from the ceiling.

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Manual hose stations and portable fire extin-guishers are available in the zones.

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1.5 conclusion i

The' fire protection in the Corner Rooms is 3

adequate to protect the safe shutdown capability 1

aof these areas.' Placement of additional fire detectors does not enhance to a significant degree the fire protection provided by the current-j configuration based upon:

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0 0 Light Combustible Loading EPR/Hypalon Cable Insulation Physical Separation of Functionally Redundant Equipment ..

No Insitu Flammable or Combustible Liquids at the 562' elevation In-addition, statification of smoke is a distinct possibility due to the small fire loading. If a small delay of fire detection is postulated, the safe shutdown capability of the plant will not be jeopardized.

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