ML20083J088
| ML20083J088 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 12/20/1983 |
| From: | PROFESSIONAL LOSS CONTROL, INC. |
| To: | |
| Shared Package | |
| ML20083H823 | List:
|
| References | |
| NUDOCS 8401090674 | |
| Download: ML20083J088 (5) | |
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_f(( Professional Loss Control, Inc.
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STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION g
Unit 1 Reactor Building El. 177' Core Spray Pump Room 110 Fi,re Area 35 i
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December 20, 1983 l
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i 8401090674 840104 i
PDR ADOCK 05000352 E
PDR l'
l P. O. Box 446 e Oak Ridge, Tennessec 37830 * (615) 482-3541
LIMERICK GENERATING STATION 1.
AREA DESCRIPTION The area under consideration is the Core Spray Pump Room, Room 110, on the 177' elevation of the Unit 1 Reactor Building (Fire Area 35) (see Attach-ment A for sketch of area). The bounding walls in the area are of rein-forced concrete construction with an average thickness of 3 ft.
The total surface area for heat transfer is 2749 ft2 (see Attachment A for calcula-tion of areas).
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COMBUSTIBLE LOADING Combustible loading in the area consists of 24 gallons of lubricating oil
- contained in the enre spray pump. For the analysis this quantity was doubled to account for possible maintenance activities in the area. A single cable tray having 37 ft2 of surface area with an average combustible loading of.5 lbs/ft2 of tray surface area.
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VENTILATION PARAMETERS A single watertight door measuring 3' wide by 5'10" high is located in the west wall of the room.
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CASES EXAMINED A lube oil fire was assumed in the area involving 48 gallons of lubricating oil. The door entering the area was assumed to be open. This is an opening area of 17.5 ft2 which results in a ventilation controlled maximum heat output of 3426 kW.
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RESULTS With one door open, the resulting ventilation controlled heat output of 3426 kW will consume the 48 gallons of lube oil in 37 minutes. The gas temperature at tnis time would be 920*F which is below tne critical temper-ature of the structural steel (see Attachment B).
The ventilation controlled burning rate of 3426 kW is equivalent to the heat output from a pool fire with an area of 11 ft2 (pool diameter of approximately 4 ft).
In order to assess the effect of the plume of heated 1
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gases above the pool fire on the structural steel located above the fire, Hesketad',s (1) relation will be used:
i Virtual point source determination:
Zo = -1.020 $.083 Q.4 = 1.01 m t
Plume temperature at bottom of steel supporting the room ceiling:
ATo = 9.1[Tg/(gc 2 2)].333 Oc.667 (Z - Zo)-1.67 p
ATo = 282*K temperature rise T = 576*F temperature of fire plume The plurae temperature is below the critical temperature of the structural steel.
It is concluded that there is no problem due to localized heating of the structural steel as a result of the maximum pool fire that can be supported by the available air flow into the room.
The cable tray in the area was positior.ed such that it did not present a localized heating exposure to the, structural steel.
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r Unit 1 Reactor Building Core Spray Pump Room 110 Surface Area Calculation Walls North wall (27' x 23')
621 ft2 South wall (20' x 23')
460 ft2 East wall (24' x 23')
552 ft2 West wall (24' x 23')
552 ft2 2185 ft2 f
Ceiling Area 1 (20' x 24')
480 ft2 Area 2 1/2(24' x 7')
84 ft2 Total Surface Area for Heat Transfer 2749 ft2 ATTACHMENT A l
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GASE NUMBER:
1 BUILDING:
UNIT.1 REACTOR BUILDING l
ELEVATION AND AREA DESCRIPTION:
177' CORE SPRAY ROOM 110 CASE DESCRIPTION:
ONE DOOR OPEN LUBE OIL FIRE xo**********************************************************************
l CEILING / WALL CEILING / WALL Ao Ho Aw Q
THICKNESS MATERIAL (ft)
(ft2)
(ft)
(ft2)
(kW) 3 un**********************************************************************
3.0 CONCRETE 17.5 5.8 2749 3426 1
FIRE IS VENTILATION CCNTROLLED FIRE DURATION GAS TEMPERATURE (min)
(deg.F)
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213 2
270 3
314 4
352 5
384 6
414 7
441 8
467 9
491 10 513 11 535 12 555 13 575 14 594 15 612 16 630 17 647 18 663 19.
680 20 695 21 711 22 726 23 740 24 755 25 769 26 783 27 796 28 809 29 822 30 835 31 848 32 860
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33 873
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34 885 i
35 896 36 908 37 920
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i ATTACHMENT B
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