ML20083J079
| ML20083J079 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/20/1983 |
| From: | PROFESSIONAL LOSS CONTROL, INC. |
| To: | |
| Shared Package | |
| ML20083H823 | List:
|
| References | |
| NUDOCS 8401090668 | |
| Download: ML20083J079 (4) | |
Text
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}(( Professional Loss Control, Inc.
l STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION t
Unit 1 Diesel Generator Enclosure El. 217' Diesel Generator Cell 1A Fire Area 79 December 20, 1983 8401090668 840104 PDR ADOCK 05000352 E
PDR P. O. Box 446 e Oak Ridge, Tennessee 37830 e (615) 482-3541
{
u LIMERICK GENERATING STATION 1.
AREA DESCRIPTION The area under consideration is the diesel generator cell 1A on the 217' elevation of the Unit 1 Diesel Generator Building (Fire Area 79).
(See Attachment A for a sketch of the area.) The bounding walls in the area are of reinforced concrete with an average thickness of 2 feet. The total sur-face area for heat transfer is 5579 ft2 (see Attachment A for calculation of areas).
2.
COMBUSTIBLE LOADING Combustible loading in the area consists of 198 ft2 of cable tray, 250 gallons of lubricating oil, and 800 gallons of fuel oil which is assumed to have leaked into the diesel generator cell from a postulated break in the fuel oil supply line.
3.
VENTILATION PARAMETERS Two intake louvers for the diesel, generator cell serve this area, each measuring 5.25' high x 6.5' wide. Both louvers are located in the south wall.
4.
CASES EXAMINED -
l The case examined assumes a fuel oil fire with both louvers serving the area open which results in a ventilation controlled fire with a maximum j
heat release rate of 12,678 kW.
This case assumes tnat the pre-action j
sprinkler system in the room does not operate and/or the fire brigade takes no action toward extinguishing the fire.
5.
RESULTS As can be seen f rom the results in Attachment B, the critical temperature of the structural steel will be exceeded within 20 minutes. This is due to the large ventilation openings in the area and the large quantity of fuel oil available for combustion.
I i
s.
l 312Al 1
DIESEL GENERATOR CEU.
[311 Al iI1 l
Q Diesel Generator Room 311A Surface Area Calculation Walls North wall (25' x 29')
725 ft2 East wall (51' x 29')
1479 ft2 South wall (25' x 29')
725 ft2 West wall (51' x 29')
1479 ft2 Ceiling 4408 ft2 (51' x 25') - (8' x 13')
1171 ft2 5579 ft2 ATTACHMENT A a
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CASE NUMBER:
1 BUILDING:
UNIT 1 DIESEL GENERATOR BUILDING ELEVATION AND AREA DESCRIPTION:
217' CELL 1A FIRE AREA 79 CASE. DESCRIPTION 4 TWO 5.25'x6.5' VENTS OPEN LUBE OIL FIRE ce************************************************x****x****x***********
CEILING / WALL CEILING / WALL Ao Ho Aw 0
THICKNESS NATER I AL (ft)
(ft2)
(ft)
(ft2)
(kW) xe*******************x***w****************************x*****************
2.0 CONCRETE 68.3 5.3 5579 12678 FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPERATURE (nin)
(deg.F) 10 876 20 1209 30 1464 40 1679 50 1869 60 2040 70 2198 80 2345 90 2483 100 2613 110 2737 120 2856 130 2970 140 3079 150 3184 160 3287 170 3386 180 3482 ATTACHMENT B y
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