ML20083J017

Structural Steel Analysis for Limerick Generating Station, Control Structure Elevation 200-Ft West Chiller Equipment Room,Room 258,Fire Area 11

ML20083J017
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
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References
NUDOCS 8401090631
Download: ML20083J017 (5)

Text

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(([ Professiona! Loss Control, Inc.

STRUCTURAL STEEL ANALYSIS for LIMERIC; GENERATING STATION Control Structure El. 200' West Chiller Equipment Room, Room 258 F.1.re Area IL l

l December 20, 1983 l

l l

0401090631 840104 PDR ADOCK 05000 E

P. O. Box 446

• Oak Ridge, Tennessee 3"830 * (615) 482-3541

4 .

LIMERICK GENERATING STATION

1. AREA DESCRIPTION The area under consideration is the West Chiller Equipment Room, Room 258, on-the 200' elevation of the Control Structure (Fire Area IL). The bound-ing walls of the room are of reinforced concrete and concrete masonry unit construction with an average thickness of 2.5 ft. The total surface area for heat transfer is 5944 ft2 (see Attachment A for sketch and surface area calculations).

2. COMBUSTIBLE LOADING Combustible loading in this area consists of cable insulation in cable trays. The total surface area of the cable trays is 195 ft2 with an average combustible loading of 2 lbs/ft2 of cable tray surface area. There are no combustible liquids in this area.

3. VENTILATION PARAMETERS There are four doors which enter,the area. Two of the doors are double doors, each measuring 8' high by 10' wide. One door is located in the west wall while the other door is located in the east wall. The remaining two doors are 3' wide by 7' high. These are both located in the north wall of the room.

4. CASES EXAMINED 4

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 195 ft2 would be involved. This corresponds to a heat output of approximately 3446 kW. With all cables

assumed to be burning simultaneously, the duration of the fire would be l 2.0 lbs/ft2 4 .1 lbs = 20 minutes.

I min /ft2

5. RESULTS With 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 362*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

mm - &

. . ~

controlled with only one door open, tne 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, h

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Control Structure El. 200' West Chiller Ec,uipment P.com 258 Surface Area Calculation Walls Nortn wall (72' x 16') 1152 ft2 East wall (35' x 16') 560 ft2 South wall (72' x 16') 1152 ft2 West wall (35' x 16') 560 ft2 3424 ft2 Ceiling (72' x 35') 2520 ft2 l Total Surface Area for Heat Transfer 5944 ft2 ATTACHMENT A

.. s CASE NUMBER: 1 BUILDING: CONTROL BUILDING ELEVATION-AND AREA DESCRIPTION: 200' WEST CHILLER EO. RM. FIRE ZONE 1L CASE DESCRIPTION: ONE-DOOR OPEN.'ALL CABLES DURNING no****************************************x*****************************

CEILING / WALL . CEILING / WALL Ao Ho Aw Q THICKNESS MATERIAL (ft) (ft2) (f t) (ft2) (kW)

• u*********************************************************x************

2.5 CONCRETE 21.0 7.0 5944 3446 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (min) (deg F) 1 138 2 165 3 185 4 202 5 218 6 231 7 244 8 256 9 2b7 10 -

277 11 287 12 297 13 306 14 315 15 323 16 332 17 340 18 347 19 355 20 362 -

ATTACHMENT B

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