ML20083J070

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 313-Ft Reactor Vent Supply Fan Room,Room 607,Fire Area 49

ML20083J070
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20083H823	List: ML20083H820 ML20083H839 ML20083H856 ML20083H867 ML20083H971 ML20083H990 ML20083J007 ML20083J017 ML20083J019 ML20083J022 ML20083J026 ML20083J030 ML20083J033 ML20083J035 ML20083J038 ML20083J045 ML20083J052 ML20083J054 ML20083J058 ML20083J062 ML20083J070 ML20083J073 ML20083J079 ML20083J082 ML20083J085 ML20083J088 ML20083J093 ML20083J096 ML20083J100 ML20083J107 ML20083J111 ML20083J115 ML20083J119 ML20083J124 ML20083J127 ML20083J136 ML20083J144 ML20083J148
References
NUDOCS 8401090665
Download: ML20083J070 (4)

Text

y .

. . t

}(( Professional Loss Control, Inc.

1 STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 313'

. Reactor Vent Supply Fan Room Room 607 Fire Area 49 V

December 20, 1983 0401090665 040104 PDR ADOCK 05000352 E PDR P. O. Box 446 e Oak Ridge, Tennessec 37830 * (615) 482-3511

- .- - ~,-- ....- - __,

. LIMERICK GENERATING STATION

1. AREA DESCRIPTION

[ The area under consideration is the Reactor Vent Supply Fan Room, Room 607, on the 313' elevation of the Unit 1 Reactor Building (Fire Area 49). The

! bounding walls of the area are of reinforced concrete construction with an average thickness of 2 ft. The majority of the south wall is louvers open to the outside. The total surface area for heat transfer is 7720 ft? (see Attachment A for sketch Snd Calculatidn of surface areas).

2. COMBUSTIBLE LOADING Combustible loading in the area consists of the cable insulation located in cable trays. The total cable tray surface area is 89 ft2 with an average combustible loading of 3.5 lbs/ft2 of cable tray surface area. There are no combustible liquids in the area.

3. VENTILATION PARAMETERS The south wall of the area contains louvers whicn measure 16' high by 75' wide and are open to the outside.

4. CASES EXAMINED With the light combustible loading in the area, the assumption that all cable trays were burning simultaneously would present tne worst case. Witn all cables burning, a cable tray surface area of 89 ft2 would be involved.

This corresponds to a heat output of 1575 kW. With all combustibles burning simultaneously the fire duration would be 3.5 lbs/ft2 + .1 lbs = 35 minutes.

min /ft2

5. RESULTS With all cable trays in the area burning simultaneously and the large area of louvers, tne resulting fire was fuel controlled. A gas temperature of ,

207'F would be acnieved after 35 minutes, which is below the critical temperature for the structural steel (see Attachment B).

The position of tne cable trays relative to structrual steel members were examined in the area. No cable trays were positioned so as to present a localized heating exposure to the structural steel.

1

_ _ _ _ _ __.______-___-m_ _ _ _ _ _ _ _

o ---

, 6 e}=

_.Y -

N ,

l LOUVERS) -

I! nit 1 Reactor Building El. 313' Reactor Vent Supply Fan Room Room 607 Surface Area Calculation Walls North wall 111' x 16') 1776 ft2 South wall 38' x 16') 608 ft2 ,

East wall 40' x 16') 640 ft2 West wall 40' x 16') 640 ft2 Ceiling (111' x 40') - (12' x 16') airlock 4056 ft2 Total Surface Area for Heat Transfer 7720 ft2 ATTACHMENT A

, . s CASE NUMBER: 1 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION A!4D AREA DESCRIPTION: 313' REACTOR VENT SUPPLY FAN ROOM CASE DESCRIPTION: LOUVERS OPEN ALL CABLES BURNING oce******x********************x*************************xx******xx******

CEILING / WALL CEILING / WALL Ao Ho Aw Q THICKNESS MATERIAL (ft) (ft2) (ft) (ft2) (kW) ocm*****************************x**********************************x****

2.O CONCRETE 1200 16.0 7720 1575 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (nin) (deg.F) 5 123 10 144 15 160 20 174 25 186 30 197 35 207 O

e b

ATTACHMENT B

. _ _ _ _ _.