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 PDR E

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 I

a heat output from a pool fire with an area of 11 f?.2 (pool diameter of approximately 4 ft). In order to assess the effect of the plume of heated 1

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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:

{ ATo = 9.1[Ts /(gcpf 2 ,2)].333 Qc.667 (Z - Zo)-1.67 ATo = 282*K temperature rise I T = 576*F temperature of fire plume The plume temperatus is below the critical temperature of the structural i steel. It is conc.bded that there is no problem due to localized heating

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

I 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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4 CEILING / WALL CEILING / WALL Ao Ho Aw Q j THICKNESS MATERIAL (ft2) (ft) (ft2) (kW) l ocw**(*f t)

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • x*******************

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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