ML20083J148

Structural Steel Analysis for Limerick Generating Station, Control Structure Elevation 200-Ft East Chiller Equipment Room,Room 263,Fire Area 1M

ML20083J148
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 8401090701
Download: ML20083J148 (5)

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J f(( Professional Loss Control, Inc.

i STRUCTURAL STEEL ANALYSIS

[ for LIMERICK GENERATING' STATION Control Structure El. 200' East Chiller Equipment Room, Room 263 F.1re Area IM December 20, 1983 8401090701 840104 PDR ADOCK 05000352 E PDR P. O. Box 446 e Oak Ridge. Tennessee 37330 e (615) 482-3541 l --~ - -

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t LIMERICK GENERATING STATION

1. AREADE5CRIPTION The area under consideration is the East Chiller Equipment Room, Room 263, 1

on the 200' elevation of the Control Structure (Fire Area IM). The bound-ing walls of the room are of reinforced concrete and concrete masonry unit l construction with an average thickness of 2.5 ft. The total strface area for heat transfer is 4872 ft2 (see Attachment A for sketch and surface area calculations).

2. COMBUSTIBLE LOADING Combustible loading in this .<rea consists of cable insulation in cable trays. The total surface area of the cable trays is 160 ft2 with an average combustible loading of 2.0 lbs/ft2 of cable tray surface area. There are no combustible liquids in this area.

3. VENTILATION PARAMETERS There are three doors which enter the area. Two of the doors are double doors, each :neasuring 8' high by 10' wide. One door is located in the east wall while the other door is located in the west wall. The third door is 3' wide by 7' high and is located in the north wall.

4. CASES EXAMINED With the light combustible loading in this area, the assumption that all cables are burning simultaneously would present the worst case. With all cable trays burning, a surface area of 160 ft2 would be involved. This corresponds to a heat output of approximately 2828 kW. With all cables assumed to be burning simultaneously, the duration of the fire would be 2.0 lbs/ft2 4 .1 lbs = 20 minutes.

min /ft2

5. RESULTS Witn all the cable trays in the area burning simultaneously and one 3' x 7' door open, the resulting fire was fuel controlled. A gas temperature of 363*F was achieved after 20 minutes, which is below the critical tempera-ture for the structural steel (see Attachment B). Since the fire was fuel 1

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controlled with only one door open, the opening of additional doors into the area.will not effect the burn rate or final gas temperature.

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

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I sy Control Structure El. 200' East Chiller Equipment Room 263 Surface Area Calculation Walls North" wall (56'x16') . 896 ft2 East wall 35' x 16') 560 ft2 Soutn wall 56' x 16') 896 ft2 West wall 35' x 16') 560 ft2 2912 ft2 Ceiling (56' x 35') 1960 ft2 Total Surface Area for Heat Transfer 4872 ft2 ATTACHMENT A l

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CASE NUMBER: 1 BUILDING: CONTROL STRUCTURE ELEVATION AND AREA DESCRIPTION: 200' EAST CHILLER EQ. RM. FIRE ZONE 1H CASE DESCRIPTION: ONE DOCR OPEN ALL CABLES BURNING rux*************************************xx*******x*x********************

CEILING / WALL ' CEILING / WALL Ao Ho Aw Q THICKNESS MATERIAL (ft) (ft2) (ft) (ft2) un***********************************************z***********x**x*(*kW) 2.5 CONCRETE 21.0 7.0 4872 2828 FIRE IS FUEL CONTROLLED o

FIRE DURATION GAS TEMPER ATURE (min) (deg.F) 1 138 2 165 3 185 -

4 203 5 218 6 232

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7 244 8 256 9 . 267 10 278 11 288 12 297 13 306 14 315 15 324 16 332 17 340 18 348 19 355 20 363 ATTACHMENT B J,_ __

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