ML20083H839

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 177-Ft Sump Room 115,Fire Area 39

ML20083H839
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20083H823	List: ML20083H820 ML20083H839 ML20083H856 ML20083H867 ML20083H971 ML20083H990 ML20083J007 ML20083J017 ML20083J019 ML20083J022 ML20083J026 ML20083J030 ML20083J033 ML20083J035 ML20083J038 ML20083J045 ML20083J052 ML20083J054 ML20083J058 ML20083J062 ML20083J070 ML20083J073 ML20083J079 ML20083J082 ML20083J085 ML20083J088 ML20083J093 ML20083J096 ML20083J100 ML20083J107 ML20083J111 ML20083J115 ML20083J119 ML20083J124 ML20083J127 ML20083J136 ML20083J144 ML20083J148
References
NUDOCS 8401090485
Download: ML20083H839 (5)

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}(( Professional Loss Control Inc. [Q ft GLC STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El.177' Sump Room, Room 115 Fire Area 39 December 20, 1983 8401090485 840104 PDR ADOCK 05000352 E PDR P. O. Box 446 e Oak I?idge. Tennessec 3"S30 e (615) 43%3MI

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LIMERICK GENERATING STATION

1. AREA DESCRIPTION The area under consideration is tne Sump Room, Room 115, on the 177' eleva-tion of the Ur.it 1 Reactor Building (Fire Area 39). The bounding walls of the area are of reinforced concrete construction with an average thickness of 2.5 ft. Tne total surface area for heat transfer is 2595 f t2 (see Attachment A for sketch and calculation of surface areas).

2. COMBUSTIBLE LOADING The combustible loading in tnis area consists of cable insulation in cable trays. The total surface area of the cable trays is 96 ft2 with an average combustible loading of 1.5 lbs/ft2 of cable tray surface area. There are no combustible liquids in the area.

3. VENTILATION PARAMETERS This room is open to tne Corridor Passageway, Roca 118. Tnere are two doors which enter into the Sump Room. .One door measuring 3' wide by 5'10" high is located in the east wall, and one door measuring 3' wide by 7' high is located at the entrance to the stairwell.

4. CASES EXAMINED Witn the lignt comoustible loading in this area, the assumption tnat all cables are burning simultaneously would present the worst case. With all cables burning siceltaneously, a surface area of 96 ft2 would be involved.

This corresponds to a heat output of approximately 1700 kW. With all combustibles assumed to oe burning simultaneously, the duration of the fire would be 1.5 lbs/ft2 + .1 lb = 15 minutes.

min /ft2

5. RESULTS With all the cable trays in the area assumed to be burning simultaneously and a 3' wide by 5'10" door open, the resulting fire was fuel controlled.

A gas temperature of 356'F was acnieved after 15 minutes, which is below the critical temperature for the structural steel (see Attachment 3),

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

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W Unit 1 Reactor Building El. 177' Sump Room 115 Surface Area Calculation Walls

' ~ North wall (24' x 23') 552 ft2 East wall (24' x 23' 552 ft2 South wall (21'x~23' 483 ft2 West wall (24' x 23') 552 ft2 2139 ft2 Ceiling (24' x 25') - (18' x 8') 456 ft2 Total Surface Area for Heat Transfer

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C'ASE' NutiBER : 1 BUILDING: UNIT 1 REACTOR DUILDING ELEVATION AND AREA DESCRIPTION: 177' SUMP ROOM FIRE 20tlE 39 CASE DESCRIPTION; ONE DOOR OPEN ALL CADLES BURNING X GMMW X X X X M XX X X MKM X X X MX X X X XM X X X X X X-X

• X X X% XWX X X X X X X WW EM-X X 4XW X X XX X X X > X X XX% XM CEILING / WALL CEILING / WALL Ao Ho Aw Q THICKNESS MATERIAL

'ft) (ft2) (f t) (Pt2) (ku) g g y. .x. X X X K X X K X W M -X M M X W -X X X M X 4 X X X X X M X X X X X X X X -X X X u k X X X X X X X X X X X X X X M X X X X .t X X X X X W A 4 2.5 CONCRETE 17.5 5.3 2595 1700 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (nin) (deg,F) 1 147 2 177 3 200 4 219 5 237 6 252 7 266 8 200 9 292

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10 304 11 315 12 326 13 337 14 346 15 356 ATTACHMEtiT B l

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