ML20083J082

Structural Steel Analysis for Limerick Generating Station, Control Structure Elevation 304-Ft Fan Room,Fire Zone 27

ML20083J082
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 8401090671
Download: ML20083J082 (8)

Text

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(([ Professional Loss Control, Inc.

STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Control Structure El. 304' Fan Room Fire Zone 27 December 20, 1983 e401090671 840104 PDR ADOCK 05000352 E PDR P. O. Box 446 e Oak Ridge, Tennessee 3"830 * (615) 482-3541 l'

e LIMERICK GENERATING STATION .

1. AREA DESCRIPTION The area under consideration is the Fan Room on the 304' elevation of the Control Structure (Fire Area 27). The bounding walls in the area are of reinforced concrete with an average thickness of 2 ft. The total surface area for heat transfer is 17,071 ft2 (see Attachment A for sketch and calculation of areas).

2. COMBUSTIBLE LOADING Combustible loading in the area consists of cable insulation located in cable trays. Total cable tray surface area is 748 ft 2. The average combustible loading of the cable trays is 3.6 lbs/ft2 of tray surface area.

There are no combustible liquids in this area. Enclosed combustibles are not included in the combustible loading.

3. VENTILATION PARAMETERS Five doors serve this area, four , measuring 3' x 7' and one measuring 9' x 10' . Two 3' x 7' doors are located in the north wall, one is located in the east wall while the fourth door is located in the west wall. The 9' x 10' door is also located in the west wall.

4. CASES EXAMINED With the light comoustible loading in this area, the assumption that all cables are burning simultaneously would present the worst case. With all cable trays burning, a surface area of 748 ft2 would be involved (see Attachment B for a list of trays). Tnree cases were examined; the first l case involving a ventilation opening of 21 ft2 , one 3' x 7' door open. The j second case examined involved a ventilation opening of 42 2ft , two 3' x 7' doors open. The third case examined involved a ventilation opening of 63 t ft ,2 three 3' x 7' doors open.

5. RESULTS For the three cases examined, all cable trays in the area are burning l simultaneously. In the first case, a gas temperature of 374 F was achieved l after 105 minutes. In the second case, a gas temperature of 506 F was

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l achieved after 54 ininutes. In the third case, a gas temperature of 591'F l

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O s was achieved after 36 minutes (see Attachment C for results of all three ,

analysis).. All three temperatures are below the critical temperature for the structural steel. The cable trays in the area were positioned so as to not present a localized heating exposure to the structural steel.

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LJ Control Structure El . 304' Fan Room Fire Zone 27 -

Surface Area Calculation Walls North wall (27' x 129') 3483 ft2 East wall (27' x 58') 1566 ft2 South wall (27' x 129') 3483 ft2 West wall (27' x 58') 1566 ft2

. 10,098 ft2 Ceiling Area 1 (58' x .29') - [(21' x 17') + (8' x 19')] 6973 ft2 Total Surface Area for Heat Transfer 17,071 ft2 ATTACHMENT A

.)

The following cable trays are assumed to be burning simultaneously.

Surface Tray No. Width (in.) Length (ft.) Area (ft2) 1DCKM01 24 2 4 1DCKM02 24 5 10 10CKM03 24 17 34 1DCKM04 24 13 26 10CKM05 24 13 26 10CKM06 24 25 50 10CKM07 24 37 74 10CKM08 24 23 46 10CKM09 24 9 18 1CCKM02 24 4 8 1CCKM03 24 10 20 1CCKM04 24 13 26 1CCKM05 24 9 18 1CCKM06 24 12 24 1CCKM07 24 9 18 1CCKM08 24 7 14 1CCKM09 24 23 46 1CCKM10 24 5 10 10CGF01 24 17 34 10CGF03 24 10 20 10CGF04 24 .. 12 24 10CGF05 24 2 4 10CGF06 24 17 34 10CGF07 24 17 34 10CGF08 24 24 48 10CGF09 24 31 62 10CGF10 24 8 16 748 ft2 Average combustible loading per tray surface area = 3.6 lbs/ft 2 Fire duration for free burning tray fires = 3.6 lbs/ft2 + .1_ l b = 36 mins.

l fB/ min

. Heat output with all trays in fire area (above) burning simultaneously:

748 ft2 _ x 190 kW/m2 = 13,208 kW 10.76 ft'/mc ATTACHMENT B l

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--+-e-- .. . - - , ,,

CASE NUMBER: 1 BUILDING: CONTROL STRUCTURE ELEVATION AND AREA DESCRIPTION: FAN ROOM EL 304' CASE DESCRIPTIONi ONE 3'x7' DOOR OPEN ALL CABLES BURNING no***********************************************************x**********

CEILING / WALL CEILING / WALL Ao Ho Aw Q THICKNESS MATERIAL (ft) (ft2) (ft) (ft2) (kW)

-*n****************************************************m*****************

2.0 ,

CONCRETE 21.0 7.0 17071 4504 FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPERATURE (Min) (deg.7) 5 138 10 166 15 106 20 204 25 220 30 234 35 247 40 -

259 .

45 270 50 281

'55 291 -

60 301 65 310 70 319 75 327 80 330 85 344 90 352 95 360

100 367 l 105 374 l

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l ATTACHMENT C

CASE NUMDER: '2 BUILDING: CONTROL STRUCTURE ELEVATION AND AREA DESCRIPTION: FAN ROOM EL 304' CASE DESCRIPTION:' TWO 3'x7' DOORS OPEN ALL CABLES BURNING nor***************************w****************xxx**********************

CEILING / WALL CEILING / WALL Ao Ho Aw Q THICKNESS MATERIAL (ft) (ft2) (ft) (ft2) (kW) uno*********************************************************************

2.0 CONCRETE 42.0 7.0 17071 9000 FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPERATURE (min) (deg.F) 2 156 4 191 6 217 8 239 10 259 12 277 14 293 16' 308 18 323 20 336 l 22 349 24 361 26 373 28 384 30 395 32 406 34 416

36 426 38 436 40 445 42 454 44 463 l 46 472 48 481 50 489 52 498 54 506 ATTACHMENT C

_ _ _ ~ . _ . _ _ .__ , _

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CASE NUMBER: 3 BUILDING: CONTROL STRUCTURE ELEVATION AND AREA DESCRIPTION: FAN ROOM EL 304' CASE DESCRIPTION! THREE 3'x7' DOORS OPEN ALL CABLES BURNING

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • x*************************************** ,

CEILING / WALL CEILING / WALL Ao Ho Aw Q THICKNESS MATERIAL (ft) (ft2) ( f' t ) (ft2) (kW)

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 17071 13208 2.O CONCRETE 63.0 7.0 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (min) (deg.F) 2 196 4 246 6 285 8 317 10 346 12 372 14 396 16 418 18 439 20 459 22 478 24 496 26 513 28 530 30 546 32 562 34 577 36 591 i

ATTACHMENT C h -c ..s-..-.~.., - . ... ~~ - - -

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