ML20083J019

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 313-Ft Laydown Area Room 601, Fire Area 48A

ML20083J019
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
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References
NUDOCS 8401090632
Download: ML20083J019 (4)

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(([ Professional Loss Control, Inc.

i STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 313' Laydown Area Room 601 Fire Area 48A December 20, '983 0401090632 840104 PDR ADOCK 05000352 E PDR P. O. Box 446

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

• C LIMERICK CENERATING STATION

1. AREA DESCRIPTION

• The area under consideration is the Laydown Area, Room 601, on the 313' elevation of the Unit 1 Reactor Building (Fire Area 48A). The bounding

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walls of the area are of reinforced concrete construction with an average f thickness of 3 ft. The total surface area for, heat transfer is 5136 ft2 l (see Attachment A for sketch and calculation of surface areas).

2. COMBUSTIBLE LOADING '

Combustible loading in the area consists of the cable insulation in a single cable tray which runs north / South through the area. The total sur-face area of the cable tray is 90 ft2 with an average combustible loading of 4 lbs/ft2 of cable tray surface area. There are no combustible liquids in the area.

3. VENTILATION PARAMETERS This area is open to the remainder of the 313' elevation of the Reactor Building.

4. CASES EXAMINED With the light combustible loading in the area, the assumption that all l cable trays are burning simultaneously would present the warst case. Witn all cables burning, a surface area of 90 ft2 would be involved. This cor-responds to a heat output of approximately 1600kW. With all combustibles burning simultaneously, the fire duration would be 4 lbs/ft2 4 .1 lbs = 40 minutes. min ft2 l S. RESULTS With all cable trays in the area burning simultaneously and the large ventilation opening, the resulting fire was fuel controlled. A gas tempera-ture of 292*F was achieved after 40 minutes, which is below the Critical temperature for the structural steel (see Attacnment B).

The position of the cable tray relative to structrual steel members was examined in the area. The cable tray was positioned so as not to present a localized heating exposure to the structural steel.

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_gt 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 Surface 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 601 CASE DESCRIPTION: ALL CABLES BURNING CEILING / WALL CEILING / WALL Ao Ho Aw Q THICKNESS MATER I AL (ft) (ft2) (ft) (ft2) (kW) 3.0 CONCRETE 608 38.0 5136 1600 FIRE IS FUEL CONTROLLED FIRE DUR ATION GAS TEMPER ATURE (min) (deg.F) 5 150 10 182 15 207 20 228 25 246 30 263 35 270 40 292 ATTACHMENT :B 1

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