ML20083J111
| ML20083J111 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/20/1983 |
| From: | PROFESSIONAL LOSS CONTROL, INC. |
| To: | |
| Shared Package | |
| ML20083H823 | List:
|
| References | |
| NUDOCS 8401090684 | |
| Download: ML20083J111 (4) | |
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(([ Professional Loss Control, Inc.
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i STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Control Structure El.180' Backwash Pump Rooms Rooms 161, 162, & 165 Fire Area IJ l
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L December 20, 1983 1
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8401090684 840104 1
PDR ADOCK 05000352 E
PDR P. O. Box 446 e Oak Ridge, Tennessec 37830 * (615.) 482-3541 y
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LIMERICK GENERATING STATION 1.
AREA DESCRIPTI0h The area under ccnsideration is the Backwash Pump Rooms, Rooms 161, 162, and 165 on the 1F0' elevation of the Control Structure (Fire Area 1J) (see Attachment A for sketch of area). The bounding walls in,the area are of f
reinforced concrete construction with an average thickness of 2.5 ft.
The total surface area for heat transfer is 1684 ft2 (see Attachment A for calculation of areas).
2.
COMBUSTIBLE LOADING Combustible loading ir the area consists of two cable trays which run east-west across room 161. Total surface area of the cable trays is 70 2
ft. The average combustible loading of the trays is 2.6 lbs/ft2 of tray surface area. There are no combustible liquids in this area.
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3.
VENTILATION PARAMETERS One door which measures 2'8" wide by 7' high serves the area. This door opens into Corridor 164.
4.
CASES EXAMINED j
With the light combustible loading in the area, the assumption that all j
caoles are burning simultaneously would present the worst case. With all cable trays burning, a surface area of 70 ft2 would be involved. This corresponds to a heat output of approximately 1240 kW.
Witn all cables assumed to be burning simultaneously the duration of the fire would be 2.6 lbs/ft2
.1 lbs = 26 minutes 4
min /ft2 5.
RESULTS With all caole trays in the area burning simultaneously and the door entering the area open, a fire temperature of 492 F was achieved after 26 minutes, which is below the critical temperature for the structural steel 1
(see Attachment B). The cable trays in the area were positioned so as not to present a localized heating exposure to the structural steel.
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Control Structure El.180' Backwash Pump Rooms Surface Area Calculation Walls Nortn wall (20' x 18')
360 ft2 South wall (20' x 18')
360 ft2 l
East wall (19' x 18')
342 ft2 l
West wall (19' x 18')
342 ft2 Ceiling 20' x 14' 280 ft2 Total Surface Area for Heat Transfer 1684 ft2 l
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ATTACHMENT A l
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CASE NUMBER:
1 BUILDING:
CONTROL STRUCTURE ELEVATION AND AREA DESCRIPTION:
180' BACKWASH PUMP ROOMS CASE DESCRIPTION ONE DOOR OPEN ALL CABLES BURNING
- cw*****************************n*******************************x**x*x**
CEILING / WALL
. CEILING / WALL Ao Ho Aw Q
THICKNESS MATERIAL i
i (ft)
(ft2)
(ft)
(ft2)
(kW)
{ c o * * * *
- x * * * * * * * * * * * * * * * *
- x- * * * * * * * * * * * * *
- x x x * * * * * * * -x x x x x x * * * *
- x x x * * * * * * *
- 2.5 CONCRETE 19.0 7.0 1684 1240 FIRE IS FUEL CONTROLLED FIRE DUR ATION GAS TEMPERATURE (nin )
(deg.F) 1 156 2
190 3
216 4
238 5
257 6
274 7
290 8
305 9
320 10 333 11 346 12 358 13 369 14 380 15 391 16 402 17 412 18 422 19 431 20 440 21 450 22 458 23 467 24 476
.25 484 26 492 ATTACHMENT B
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