ML20083J030

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 313-Ft Laydown Area Room 602, Fire Area 48A

ML20083J030
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
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References
NUDOCS 8401090638
Download: ML20083J030 (4)

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(([ Professional Loss Control, Inc.

STRUCTU2AL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 313' Laydown Area Room 602 Fir.e Area 48A December 20, 1983 9401090630 840104 PDR ADOCK 05000352 E PDR P. O. Box 446

• Oak Ridge, Tennessee 37830 * (615) 482-3541

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l 4 LIMERICK GENERATING STATION

1. AREA DESCRIPTION The area under consideration.is the Laydown Area, Room 602, on the 313' elevation of the Unit 1 Re~ actor Building (Fire Area 48A). The bounding walls in the area are of reinforced concrete construction with an average thickness of 3 ft. Tne total surface area for heat transfer is 16,764 ft2 (see Attachment A for sketch and surface area calculations).

2. COMBUSTIBLE LOADING Combustible loading in the area consists of a single cable tray located along the north wall of the area. The total surface area of the cable tray is 164 ft2 with, an average combustible loading of 3.5 lbs/ft2 of cable tray surface area. There are no combustible liquids in this area.

3. VENTILATION PARAMETERS This area is open to the remainder of the 313' elevation by two large walk-ways in the south wall. ,

4. CASES EXAMINE 0 With the light coinbustible loading in this area, tne assumption that all cables are burning simultaneously would present the worst case. With all cable trays burning a surface area of 164 ft2 would be involved. This corresponds to a heat output of approximately 2900 kW. With all cables assumed to be burning simultaneously the duration of the fire would be 3.5 lbs/ft2 4 .1 lbs = 35 minutes.

min /ft2

5. RESULTS With all cable trays in the area burning simultaneously, a gas temperature of 186*F was achieved af ter 35 minutes, which is below the critical temper-ature for the structural steel (see Attachment B). The cable tray in the area was positioned so as to not present a localized heating exposure to the structural steel.

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Unit 1 Reactor Building El. 313' Laydown Area Room 601 Surface Area Calculation Walls North wall (12' x 38') 456 ft2 South wall (12' x 38') 456 ft2 East wall (48' x 38') 1824 ft2 West wall (48' x 38') 1824 ft2 Ceiling 576 ft2 Total Sui face Area for Heat Transfer 5136 ft2 ATTACHMENT A

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CASE NUMBER: 1 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 313' LAYDOWN AREA ROOM 602 CASE DESCRTPTIONI ALL CABLES BURNING

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CEILING / WALL CEILING / WALL Ao Ho Aw 0 THICKNESS HATERIAL (ft) (ft2) (ft) (ft2) ( ;< W )

x***********************************************************xx*******.xxx 3.0 CONCRETE 222.0 37.0 16764 2900 FIRE IS FUEL CONTROLLED FIRE DUR ATION GAS TEMPERATURE (nin) (deg.F) 1 92 2 100 3 106 4 111 5 115 6 119 7 123 8

127 9 130 10 133 11 136 12 139 13 142 14 144 15 147 16 149 17 152 18 154 19 156 20 159 21 161 22 163 23 165 24 167 25 169 26 171 27 173 28 174 29 176 30 178 31 180 32 181 33 183 34 185 35 186 ATTACHMENT B

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