ML20083J035

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 177-Ft Core Spray Pump Room 114,Fire Area 37

ML20083J035
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
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References
NUDOCS 8401090642
Download: ML20083J035 (5)

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STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 177' 4

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Core Spray Pump Room 114 Fire Area 37 i

December 20, 1983 t

h 0401090642 840104 PDR ADOCK 05000352 j

E PDR h

P. O. Box 446

• Oak Ridge, Tennessee 37830 * (615) 482-3541

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LIMERICK GENERATING STATION i

1.

AREA DESCRIPTION j

The area unaer consideration is the Core Spray Puap Room, Room 114, on the 177' elevation of the Unit 1 Reactor Building (Fire Area 37) (see Attach-l ment A for sketch of area).

The bounding wall.s in the area are of rein-forced concrete construction with an average thickness of 3 ft.

Tne total i

surface area for heat transfer is 2784 ft2 (see Attachment A for calcula-tion of areas).

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COMBUSTIBLE LOADING

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Combustible loadir.g in the area consists of 24 gallons of lubricating oil contained in the core 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 is located along the east wall.

3.

VENTILATION PARAMETERS A single watertight door measurir g 3' wide by 5'10" high is located in the east 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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IlESULTS l

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 this time would be 909*F which is below the critical temperature of the structural steel (see Attachment B).

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The ventilation controlled burning rate of 3426 kW is eouivalent to the l

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) relations will be used:

I Virtual point source determination:

Zo = -1.020 +.083 Q.4 = 1.01 m Plume temperature at bottom of steel supporting the room ceiling:

ATo = 9.1[Tg /(gcp j,2)].333 gc.667 (Z - Zo)-1.67 2

ATo = 282'X temperature rise T = 576"F temperature of fire plume The plume 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 roon..

The cable tray in the area was positioned such thet it did not present a localized neating exposure to thg structural steel.

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1 Unit 1-Reactor Building Core Spray Pump Room 114 Surface Area Calculation Walls North wall 29' x 23')

667 ft2 South wall 12' x 23')

276 ft2 East wall 25' x 23')

575 ft2 West wall (30' x 23')

690 ft2 l

2208 ft2 i

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Ceiling Area 1 (10' x 24')

240 ft2 Area 2 1/2(24' x 28')

336 ft2 Total Surface Area for Heat Transfer 2784 ft2 l

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ATTACHMENT A l

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CASE NUMBER:

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BUILDING:

UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION:

177' CORE SPRAY PUMP ROOM ROOM 114

' CASE DESCRIPTION's ONE DOOR OPEN LUBE DIL FIRE i

oc*************************************x********************************

CEILING / WALL-CEILING / WALL Ao Ho Aw Q

l THICKNESS MATERIAL i

(ft)

(ft2)

(ft)

(ft2)

(kW) oc**********************************************************************

i 3.0 CONCRETE 17.5 5.8 2784 3426 FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPERATURE (min)

(deg.F) 1 211 2

268 3

311 4

348 5

380 6

410 7

437 i

8 462 9

485 10 508 11 529 12 549 13 568 14 587 15 605

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16 623 17 640 18 656 19 672 20 688 21 703 22 718 23 732 24 746 25 760 26 774 27 787 28 800 29 813 30 826 31 838 32 850 i

33 862 I

34 874 35 886 36 898 37 909 ATTACHMENT B

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