ML20079G202

Structural Steel Analysis for Limerick Generating Station: Spray Pond Pump Structure,El 251 Ft,Rhr Svc Water Valve Compartment,Fire Area 122E

ML20079G202
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20079G166	List: ML20079G163 ML20079G181 ML20079G188 ML20079G196 ML20079G202 ML20079G216 ML20079G220 ML20079G223 ML20079G227 ML20079G233
References
NUDOCS 8401190466
Download: ML20079G202 (4)

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STRUCTURAL STEEL ANALYSIS for i LIMERICK GENERATING STATION Spray Pond Pump Structure El. 251' l RHRSW Valve Compartment Fire Area 122E s

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i December 20, 1983 P. O. Box 446 e Oak Ridge Tennessee 37830 e (615) 482-3541 8401190466 840113 PDR ADOCK 05000352 F PDR

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9r LIMERICK GENERATING STATION

1. AREA DESCRIPTION The area under consideration is the RHRSW Valve Compartment on the 251' elevation of the Spray Pond Pump Structure (Fire Area 122E). Tne bounding

. walls of the area are of reinforced concrete construction with an average thickness of 2.5 ft. The total surface area for heat transfer is 1871 f t2 (see Attachment A for sketch and calculation of surface areas).

2. COMBUSTIBLE LOADING Combustible loading in the area consists of the cable insulation in a single cable tray. ~ The total surface area of the cable tray is 64 ft2 with L an average combustible loading of 3 ids /ft2 of cable tray surface area.

There are no combustible liquids in the area.

'3. VENTILATION PARAMETERS Ventilation to the area is through an open stairwell which leads to the 268' elevation.

4. CASES EXAMINED With the light combustible loading in the area, the assumptinn that all cables were burning simultaneously would present the worst case. With all cables burning, a cable tray surface area of 64 ft2 would be involved. This corresponds to a heat output of 1130 kW. The fire duration with all cables burning would be 3 los/ft 2 '4 .1 lbs = 30 minutes.

min /ft2

5. RESULTS With cables burning simultaneously, a gas temperature of 442 F would be achieved af ter 30. minutes, which is below the critical temperature of the structural steel (see Attachment B).

Tne: position of the cable tray relative to the structural steel members was examined in the area. The cable tray was positioned so as to not present a localized heating exposure to the structural steel.

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Spray Pond Pump Structure El. 251',

RHRSW Valve-Compartment Surface ; Area ' Calculation -

Walls North wall. ' (31' x 14'.)- 434 ft2 South wall (31'.x.14') 434 ft2 East wall (17' x 14') 238 ft2 West wall ' (17' x 14'.) . 238 ft2 1344 fte jCeiling . (31' x 17')' 527 ft2 g Total-Surface Area for Heat Transfer 1871-ft2 e

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w ATTACHMENT A-

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CASE NUMBER: 1 BUILDING: SPR AY POND PUMP STRUCTURE U ,

ELEVATION AND AREA DESCRIPTION: 251' RHRSW VALVE COMPARTMENT CASE DESCRIPTION: OPEN STAIRWELL ALL CABLES BURNING coo x * * *

• x

• x * * * * * * *

• x

• x x x *

• x x x * * * * * * *

• x x

• x w * * *

• x *

• x u * * *

• x x x

• x x x *

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• x x x x x CEILING / WALL CEILING / WALL Ao Ho Au Q THICKNESS MATERIAL (ft) (ft2) (ft) (ft2) (kW) noo******x**********x****xx*x**xx****x**x********xw*xxx*x*****xx***xx***

H2 . 5 CONCRETE 36.0 12.0 1871 1130 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (min) (deg.F) 2 168 4 208 6 230 8 264 10 286 12 306 14 325 16 342 18 359 20 -

374-22 389 24 403 26 417 28 '430

. 30 442 ATTACHMENT B

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