ML20083J054
| ML20083J054 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/20/1983 |
| From: | PROFESSIONAL LOSS CONTROL, INC. |
| To: | |
| Shared Package | |
| ML20083H823 | List:
|
| References | |
| NUDOCS 8401090657 | |
| Download: ML20083J054 (4) | |
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(([ Professional Loss Control, Inc.
STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Control Structure El. 180' Backwash Receiving Tank Room 163 Fi.re Area 1G l
l December 20, 1983 0401090657 840104 PDR ADOCK 05000352 E
PDR P. O. Box 446 e Oak Ridge, Tennessee 37830 e (615) 482-3541
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LIMERICK GENERATING STATION 1.
AREA DESCRIPTION The area under consideration is the Backwash Receiving Tank Room 163 on the 180' elevation of the Control Structure (Fire Area 1G) (see Attachm for sketch of area). The bounding walls in the area are of reinforced concrete construction with an average thickness of 3 ft.
The total surface area for heat transfer is approximately 2772 ft2 (257 m2)'(see Attachment A for calculation of areas).
2.
COMBUS,TIBLE LOADING Combustible loading in the area consists of two cable trays which run east-west across the room.
The total su.rface area of the trays is 164 ft2 The average combustible loading of the tray.s is 3.5 lbs/ft2 of tray surface There are no combustible liquids in this area.
area.
3.
VENTILATION PARAMETERS There is one door leading into this area.-
The door measures 3' wide by 7' high and is located in the northwest corner of the room.
4.
CASES EXAMINED With the light combustible loading in the area, the 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 i
3.5 lbs/ft2
.1 lbs = 35 minutes 4
min /ft2 5.
RESULTS With all cable trays in the area burning simultaneously and the door enter-ing the area open, a fire temperature of 764*F was achieved after 35 min-utes, which is below the critical temperature for the structural steel (see Attachment B).
None of the cable trays in the area was positicaed so as to present a localized heating exposure to the structural steel.
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Control Structure El. 180' Backwash Receiving Tank Room 163 Surface Area Calculation Walls Nortn wall (40' x 18')
South wall (40' x 18')
720 ft2 East wall (17' x 18')
720 ft2 West wall (17' x 18')
306 ft2 306 ft2 Ceiling 40' x 18 '
__720 ft2 Total Surface Area for Heat Transfer 2772 ft2 i
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ATTACHMENT A w,-
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P 1
BUILDING:
CONTROL STRUPTURE ELEVATION AND AREA DESCRIPTION:
CASE DESCRIPTION:
180' ONE DOOR OPEN ALL BACKWASH RECEIVING TANK AREA x * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- w x
- 163 CEILING / WALL
- xx*******************
THICKNESS CEILING / WALL Ao Ho (ft)
MATERIAL Aw Q
u*************************************(ft2)
(ft)
CONCRETE
- * * * * * * * * * * * * * * * *( f t 2 )*
- 3.0 (k
21 7
2772 2900 FIRE IS FUEL CONTROLLED FIRE DURATION (nin)
GAS TEMPERATURE
<een,y) 5 10 334 15 442 20 525 25 595
'30 657 35 713 764 1
f ATTACHMENT 8
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