ML20083J045

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 177-Ft Core Spray Pump Room 113,Fire Area 36

ML20083J045
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
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References
NUDOCS 8401090650
Download: ML20083J045 (5)

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STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION f

Unit 1 Reactor Building El.177' Core Spray Pump Room 113 F1.re Area 36 December 20, 1983 l

l 0401090650 840104 PDR ADGCK 05000352 E

PDR P. O. Box 446

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

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LIMERICK GENERATING STATION

'1.

AREA DESCRIPTION The area under consideration is the Core Spray Pump Room, Room 113, on the

~177' elevation of the Unit 1 Reactor Building (Fire Area 36) (see Attach-ment A for sketch of area). The bounding walls in the area are of rein-

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forced concrete construction with an average thickness of 3 ft.

The total surface area for heat transfer'is 2976 ft2 (see Attachment A for calcula-tion of areas).

2.

COMBUSTIBLE LOADING Combustible loading in the area consists of 24 gallons of lubricating oil contained in the Core spray pump. For the analysis this quantity was I

doubled to account for possible maintenance activities in the area. A single cable tray having 34 ft2 of surface area with an average combustible loading of.5 lbs/ft2 of tray surface area is located along the north wall.

3.

VENTILATION PARAMETERS A single watertight door measuring 3' wide by 5'10" high is located in the

, west wall of the room.

4.

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 i

area of 17.5.ft2 which results in a ventilation controlled maximum heat output of 3424 kW.

5.

RESULTS l

With one door open, the resulting ventilation controlled heat output of I

3424 kW will consume the 48 gallons of lube oil in 37 minutes. The gas temperature at this time would 853*F which is below the critical temperature of the structural steel (see Attachment B).

The ventilation controlled burning rate of 3424 kW is equivalent to the heat output from a pool fire with an area of 11 f?.2 (pool diameter of I

a approximately 4 ft).

In order to assess the effect of the plume of heated l

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l' gases above the pool fire on the structural steel located above the fire, Hesketad'.s (1) relation will be usec:

j Virtual point source determination:

Zo = -1.020 +.083 0 4 = 1.01 m l

Plume temperature at bottom of steel supporting the room ceiling:

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ATo = 9.1[Ts /(gc 2,2)].333 Qc.667 (Z - Z )-1.67 pf o

ATo = 282*K temperature rise I

T = 576*F temperature of fire plume The plume temperatus is below the critical temperature of the structural steel.

It is conc.bded that there is no problem due to localized heating i

of the structural steel as a result of the maximum pool fire that can be Support' d by the available air flow into the room.

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

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Unit 1 Reactor Building Core Spray Pump Room 113 Surface Area Calculation Walls North wall (34' x 23')

782 ft2 South wall (40' x 23')

920 ft2 East wall (5' x 23')

115 ft2 West wall (24' x 23')

552 ft2 2369 ft2 Ceiling Area 1 (11' x 19')

209 ft2 Area 2 (34' x 5')

170 ft2 Area 3 1/2(24' x 19')

228 ft2 Total Surface Area for Heat Transfer 2976 ft2 ATTACHMENT A J

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CASE NUMBER:

1 BUILDING:

UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION:

177' CORE SPR AY ROOM 113 FIRE AREA 36 CASE DESCRIPTION:

ONE DOOR OPEN LUBE OIL FIRE

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CEILING / WALL CEILING / WALL Ao Ho Aw Q

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THICKNESS MATERIAL l

ocw**(*f t )

(ft2)

(ft)

(ft2)

(kW)

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j 3.0 CONCRETE 17.5 5.0 2976 3417 i

FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPERATURE

-(nin)

(deg.F) 1 202

-2 255 3

295 4

330 5

360 6

387 7

412 8

436 9

458 10 478 11 498 12 517 13 535 14 553 15 570 16 586 17 602 18 617 19 632 20 646 21 661 l

22 674 23 688 24 701 25 714 26 727 l

27 739 l

28 751 29 763 30 775 i

31 787 l

32 798 i

33 810 34 821 35 832 36 842 37 853 l

ATTACHMEtiT B

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