ML20083J007

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 313-Ft Corridor Room 605,Fire Area 48A

ML20083J007
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 8401090619
Download: ML20083J007 (4)

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s y(( Professional Loss Control, Inc.

l STRUCTURAL STEEL ANALYSIS -

for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 313' Corridor. Room 605 Fir,e Area 48A December 20, 1983 8401090619 840104 PDR ADOCK 05000352 E PDR P. O. Box 446 e Oak Ridge, Tennessee 37830 e (615) 482-3541 l

a. V.

LIMERICK GENERATING STATION 1.-' AREA DESCRIPTION The area under consideration is the Corridor, Room 605, on the 313' eleva-tion of the Unit 1 Reactor Building (Fire Area 48A). The bounding walls of p the area are of reinforced concrete construction with an average thickness of 2.5 ft. The total surface area for heat transfer is 12,460 ft2 (see Attachment A for sketch and calculation of surface areas).

2. COMBUSTIBLE LOADING Combustible loading in the area consists of the cable insulation located in cable trays. The total cable tray surface area is 508 ft2 with an average combustible loadng of 3.5 lbs/ft2 of cable tray surface area. There are no combustible liquids in the area.

3. VENTILATION PARAMETERS This area is open to the remainder of the 313' elevation of the Reactor Building. ~

4. CASES EXAMIN'ED All cables in the area were assumed to be burning simultaneously. With all cable trays burning a surface area of 508 ft2 would be involved. This cor-respnds to a heat output, of approximately 8970 kW. With all combustibles burning simultaneously, the fire duration would be 3.5 lbs/ft2 4 .1 lbs =

35 minutes. -

min ft2

5. RESULTS With all cable trays in the area burning simultaneously and the large ventilation opening, the resulting fire was fuel controlled. A gas tempera-ture of 548'F would be achieved after 35 minutes, which is below the criti-cal temperature for the structural steel (see Attachment B).

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

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Unit 1 Reactor Building El. 313'

. Corridor Room 605 Surface Area Calculation Walls North wall (160' x 38') 6080 ft2 South wall (112' x 38') 4256 ft2

, East wall (9' x 38') 342 ft2 West wall (9' x 38') 342 ft2 l

l Ceiling (160' x 9') 1440 ft2 Total Surface Area for Heat Transfer 12,460 ft2 ATTACHMENT A l

CASE ~ NUMBER: 1 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 313' CORRIDOR ROOM 605 CASE DESCRIPTION: ALL CABLES BURNING c***********************************************************************

CEILING / WALL CEILING / WALL Ac Ho Aw 0 THICKNESS MATERIAL (ft) (ft2) (ft) (ft2) (kW) cw**********************************************************************

2.5 CONCRETE 304 38.0 12460- 8970 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (min) (deg.F) 5 253 10 327 15 384 20 432 25 475 30 513 35 548

, ATTACHMENT B

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