ML20083J127

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 217-Ft Safeguard Sys Area Room 309,Fire Area 43

ML20083J127
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
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References
NUDOCS 8401090692
Download: ML20083J127 (6)

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STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 217' Safeguard System Area Room 309 Fi.re Area 43 l

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December 20, 1983 l

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i B401090692 840104 PDR ADOCK 05000352 PDR E

P. O. Box 446

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

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LIMERICK GENERATING STATION 1.

AREA DESCRIPTION l

The area under consideration is the Safeguard System Area, Room 309, on the l

217' elevation of the Unit 1 Reactor Building (Fire Area 43). Bounding l

walls to the north, south, and east are of reinforced Concrete construction while the west wall is of concrete masonry unit construction. The average wall thickness is 2 ft. The total surface area for heat transfer is 13,777 ft2 (see Attachment A for sketch and surface area calculations).

2.

COMBUSTIBLE LOADING Combustible loading in this area consists of two cable trays,10CRA and 10lWA, which are located along the south wall of the area. The total sur-face area of the cable trays is 460 ft2 with an average combustible loading of 6.5 lbs/ft2 of cable tray surface area. There are no combustible liquids l

in this area.

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VENTILATION PARAMETERS Two steam tight doors each measuring 3' wide by 7' high enter this area.

One door is located in the east wall while the other door is located in the west wall.

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4.

CASES EXAMINED Two cases were examined for this area. The first case assumed all cable trays in the area to be burning simultaneously with one door open. The l

l second case assumed all cable trays burning simultaneously with two doors open.

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RESULTS Case number one assumed one 3' x 7' door open with all cables burning simultaneously. This resulted in a ventilation controlled fire witn a heat output of 4504 kW and a duration of 120 minutes. The gas temperature at I

this time would be 472*F which is below the critical temperature of the i

structural steel (see Attachment B).

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I Case number two assumed both 3' x 7' doors open with all cables burning simultaneously. This resulted in a fuel controlled fire with a heat output of 8123 kW.

The fire duration would be 6.5 lbs/ft2

.1 lbs = 65 minutes.

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min /ft2 s

The gas temperature at this time would be 604*F, which is below the criti-i ca', temperature of the structural steel (see Attachment B).

The location of the cable trays relative to structural steel members was examined in the area. No caole trays were positioned so as to present a localized heating exposure to structural steel.

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Onit 1 Reactor Building El 217' Safeguard System Area Room 309 Surface Area Calculation Walls North wall (140' x 35')

4900 ft2 South wall (107' x 35')

3745 ft2 East wall (31' x 35')

1085 ft2 West wall (62' x 35')

2170 ft2 11,900 ft2 Ceiling Area 1 (7' x 107')

749 ft2 Area 2 1/2(32' x 36')

576 ft2 Area 3 1/2(48' x 23')

552 ft2 Total Surface Area -for Heat Transfer 13,777 ft2 ATTACHMENT A

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l CASE NUMBER:

1 BUILDING:

UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION:

217' SAFEGUARD SYSTEM AREA ROOM 309 CASE DESCRIPTIONI ONE DOOR OPEN ALL CABLES BURNING j

CEILING / WALL CEILING / WALL Ao Ho Aw Q

,THICXNESS M ATERI AL 4

f (ft)

(ft2)

(ft)

(ft2)

(kW) 9 f*n**********************************************************************

2.0 CONCRETE 21.0 7.0

'13777 4504 l

FIRE IS VENTILATION CONTROLLED i

FIRE DUR ATION GAS TEMPERATURE (Min)

(deg F) 10 188 20 236 30 272 40 303 50 331 60 355 70 378 80 399 90 419 100 438 110 455 120 472 1

i ATTACHMENT B rr-

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4 CASE NUMBER:

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BUILDING:

UNIT.1 REACTOR BUILDING l

ELEVATION AND AREA DESCRIPTION:

217' cAFEGUARD SYSTEM AREA ROOM 309 CASE DESCRIPTION!

TWO DOORS OPEN ALL CABLES BURNING

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CEILING / WALL CEILING / WALL Ao Ho Aw Q

THICKNESS MATERIAL j

(ft)

(ft2)

(ft)

(ft2)

(kW) noc*********************************************************************

2.0 CONCRETE 42.0 7.0 13777 8123 FIRE IS FUEL CONTROLLED l

FIRE DUR ATION GAS TEMPERATURE (min)

(deg.F) 5 220 9

10 281 15 328 20 367 25 402 30 433 35 462 40 489 45 514 50 538 55 561 60 583 65 604 4

ATTACHMENT B m

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