ML20083J124

Structural Steel Analysis for Limerick Generating Station, Control Structure Elevation 180-Ft Corridor 166,Fire Area 1B

ML20083J124
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
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References
NUDOCS 8401090691
Download: ML20083J124 (4)

Text

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t y(( Professional Loss Control, Inc.

I STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Control Structure El.180' Corridor 166 Fi,re Area 1B 1

l December 20, 1983 8401090691 840104 PDR ADOCK 05000352 E

PDR P. O x 446 e Oak Ridge Tennessee 37830 e (615) 482 3541 I

1.--..

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LIMERICK GENERATING STATION 1.

AREA DESCRIPTION The area under consideration is Corridor 166 on the 180' elevation of the Control Structure (Fire Area 1B) (see Attachment A for sketch of area).

Bounding walls are of reinforced concrete construction with an average i

thickness cf 3 feet. Total surface area for heat transfer is approximately 2 (184 m2) (see Attachment A for calculation of areas).

1980 ft 2.

COMBUSTIBLE LOADING Combustible loading in this area consists of two cable trays which run north-south across the corridor. The total surface area cf the trays is 32 ft2 The average combustible loading of the cable trays is 3 lbs/ft2 of tray surface area. There are no combustible liquids in this area.

3.

VENTILATION PARAMETERS Both ends of the corridor are open. The west end opening measures 8' wide by 8' high. The east end of the c.orridor leads to an open stairwell. serving the upper elevations.

4.

CASES EXAMINED With the light combustible loading in the area, the assumption that all cables are burning simultaneously would present the ' orst case. With all w

cable trays burning, a surface area of 32 ft2 would be involved. This corresponds to a heat output of approximately 60kW. With all cables assumed to be burning simultaneously, the duration of the fire would be I

3 las/ft2 1 lb

= 30 minutes.

4 min ft2 5.

RESULTS With all cable trays in the area burning simultaneously, a fire temperature of 90*F was reached after 30 minutes (see Attachment B). None of the cable l

trays in the area were positioned so as to present a localized heating exposure to structural steel.

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Control Structure El.180'

f Corridor 166 Surface Area Calculations Walls Nortn wall (45' x 18')

810 ft2 South wall (45' x 18')

810 ft2 Ceiling (45' x 8')

360 ft2 Total Surface Area for Heat Transfer 1980 ft2 I

i ATTACHMENT A f

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j-CASE NUMBER:

1 BUILDING:

CONTROL STRUCTURE ELEVATION AND AREA DESCRIPTION:

180' CORRIDOR 166 CASE DESCRIPTION:

OPEN CORRIDOR ENDS ALL CABLES BURNING oc**********************************************************************

CEILING /W/.LL CEILING / WALL Ao Ho Aw Q

THICKNESS

-MATERIAL (ft)

(ft2)

(ft)

(kW)

• u******************************************************(*ft2) j 3.0 CONCRETE 64.0 8.0 1980 60 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (etin)

(deg.F) c 5

79 t'

i 10 82 15 85 20 87 25 89 30 90 l

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ATTACHMENT B

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