ML20126J840

Rev 0 to Structural Steel Analysis for Peach Bottom Generating Station:Calculation 51,Unit 2,3,Turbine Bldg El 135 Ft Corridor to Switchgear Rooms,Fire Area 78A

ML20126J840
Person / Time
Site:	Peach Bottom
Issue date:	05/30/1985
From:	Dewey J, Melly B PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20126J788	List: ML20126J783 ML20126J825 ML20126J840 ML20126J858 ML20126J886 ML20126J909 ML20126J926 ML20126J952 ML20126J976 ML20126J990
References
NUDOCS 8506100710
Download: ML20126J840 (12)

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A STRUCTURAL STEEL ANALYSIS for PEACH BOTTOM GENERATING STATION Calculation No .51 Unit 2,3 Turbine Building El. 135' y Corridor to Switchgear Rooms ,,

Fire Area 78A

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i Prepared by: Date: ' b

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-Reviewed by: _.

Revisions O 8506100710 850606

. (. ~ PDR ADDOK 05000277 F PDR 4

7922 West Chester Pike

• Upper Darby, Pa. 19082 * (215) 853-1700

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[ PEACH BOTTOM GENERATING STATION 1- 6869_DESGBIPTIQN The area under consideration is the corridor to the Switchgear

- Rooms on the 135' elevation of the Turbine Building (Fire Area 78A). The bounding wa71s are constructed of concrete block with

.an- average thickness of 1 ft. The total surface area for heat transfer is 4,432 ft 2 (see Attachment A for a sketch of the area under consideration).

2. GQMBUSTIBLE LOADINQ' This area contains cable trays. The average loading in the cable trays is 4.77 lbs/ft2 of cable tray surface area. The total surface area of cable trays in this area is 241 ft , 2 There are no combustible liquids in this area. Enclosed combustibles such,as cabling in conduit have not been considered in this analysis.

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3. ygNTILATIQN__ PARAMETERS There are 11 doors which enter th2s area. Eight doors measure 3' wide by 7' high and three doors measure 3'-7 1/2" wide and l

6' -9 3/4 " high.

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(- 4. G8SES_EKAMINER A spreading cable fire was assumed to originate in the area of heaviest cable concentration in order to present the worst case.

The fire is assumed to start at a point source and spread horizontally along the cable trays in each direction at a rate of 10 ft. per hour and instantaneously up any vertical trays encountered. The fire will spread a distance of 8 feet in each direction along the cable trays before the original point source dies out after 48 minutes. A maximum surface area of 49 ft2 of cable trays (see Attachment B for a list of trays) will be involved at*any one time, which corresponds to a heat output of 861.6 kW. This heat output is assumed constant throughout the fire duration. The actual heat output as the fire spreads out of the area originally involved would be less since the quantity of cabling involved at any one time would be less.

5. BESULTS

• The first case examined was that of a spreading cable fire.

The fire duration was taken to be 180 minutes which is the maximum fire resistance rating required for the barrier The maximum temperature reached was 527 OF, which is below the critical temperature for the structural steel (see Attachment C for results of analysis.) Since the resulting fire was fuel controlled with one door open, it will also'be fuel controlled if any additional doors are open.

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[ The positions of cable trays relative to structural steel members were examined throughout the area in order to assess the potential for localized heating. Attachment D contains the results of calculations performed to determine the response of the affected structural members to localized heating. These calculations are conservative because they assume that the entire len th of the member is subjected to the exposure temperature, whereas, ir reality only a short section would be. The duration of each cable tray fire is taken to be 48 minutes which is the time required for a cable tray to burn to completion. The cable tray expo'sures and beam responses are tabulated as follows:

Case Exposure Separation Member Exposure Final Beam

( _Ngu_ _ Trayg_ Distance _Tygg_ Igsgu191 Temg._(CEL 1 ZC2CVO30 (2' W12x27 1300 _ 1300 2 ZD2CVO40 (l' W12x27 1500 1500 3 ZC3PVO2, (2' W16x36 1300 1299 4 ZD2CNO70 1'-5 1/2" Same as Case 1 5 ZD30VO2 (1' Same as Case 2 6 3CGB86 1'-11 1/2" Same as Case 3 ZC3PVO3

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6. EEEEQTS OF TRANSIgNT.CgMBUSTIBLES' l

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The worst case ~ fire examined was fuel controlled with a duration of 180. minutes. The maximum additional heat release rate due to

- transient materials in the area which will result in an area

, temperature less than 11000F is listed below.

Eire Quration 9/A (kW/m21 91hW1 180 6. 5 1,814 The distance between the floor and the deepest beams. supporting the ceiling is it'-O 1/2". The heat release rates required of

-( floor level transient combustible fires to produce plume temperatures of 11000F, 13OOOF and 15000F at the bottom flange of the beam have been determined and tabulated below. For the-temperatures greater than 11000F the time required

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to. heat the sizes of-the beams supporting the ceiling have also r -~ been ' determined.

113g to 11QQOF1 mini

'11 1 9(kW). W1EEEZ W16x36 kW) 1100 2,576 - -

.1300- 3,38'3 10 13 1500 4,274 7 8 1

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Turbine Building Elevation 135' Corridor to Switchgear Rooms Surface Area Calculation Walls-2 North wall ,(4.5' x 14')

63 ft East wall (132.5' x 14) I055 ft 2 South wall (4.5' x 14') 63 ft 2 2

West wall (132.5' x 14) 1855 ft Ceiling (132.5' x 4.5') 596 ft 2 Tetal Surfact Area - for Heat Transfer 4432 ft 2 ATTACHMENT A

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.f SPREADING CABLE FIRE TRAY TRAY SECTION LENGTH WIDTH SQUARE FEET 3CQB 86 16 2 32 2C3PV 02 4.5 2 9 2C3PV 03 4 2 8 49 Sq. Ft.

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ATTACHliENT B

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1 CASE NO.: 1 l BUILDING:. PEACH BOTTOM TURBINE BUILDING ELEVATION AND AREA DESCRIPTION: 135' CORRIDOR IN FRONT OF THE SWGR. ROOMS

. CASE DESCRIPTION: SPREADING CABLE FIRE )

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CEILING / WALL CEILING / WALL Ao Ho Aw Q

' THICKNESS MATERIAL (FT.). SQ. FT. FT. SQ. FT. KW I F .o+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

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CONCRETE BLOCK 21.0 7. 0 4432 852 FIRE IS FUEL CONTROLLED  !

FIRE DURATION GAS TEMPERATURE (MIN.) -

(DEG. F) 10 408 20 419 30 428 40 437

.( 50 EO 445 452 I

70 459 80 456 90 473 100 480 110 486 120 '

492 130 498 140 504 150 510 160 516 170 522 180 527

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ATTACHMENT C

CASE NO.: 1 '

-BUILDING: PEACH BOTTOM UNITS 2&3 TURBINE BUILDING ELEVATION AND AREA DESCRIPTION: 135' CORRIDOR TO THE SWGR. ROOM r ' ~ CASE DESCRIPTION: W12X27 I

EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL t

FIRE TEMPERATURE (DEG. F): 1300

' WEIGHT OF STEEL MEMBER (LBS./FT.):- 27 SURFACE OF STEEL MEMBER HEATED (SQ. FT./FT): 4.12 TIME STEEL TEMPERATURE (MIN.) (DEG. F) 5 811 10 1106 15 -

1223 ,

20 1259 25 1288 30 1295 -

35 1298 40 1299

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45 50 1300 1300 ATTA0Yl?ENT D

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CASE NO.: 2

'CUILDING: PEACH BOTTOM UNITS 2&3 TURBINE BUILDING

' ELEVATION AND AREA DESCRIPTION: 135' CORRIDOR TO THE SWGR. ROOM CASE DESCRIPTION: W12X27 EFFECTS OF-LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE (DEG. F): 1500 WEIGHT OF STEEL MEMBER (LBS./FT.): 27 SURFACE OF STEEL MEMBER HEATED ~(SQ. FT./FT): 4.12 TIME STEEL TEMPERATURE (MIN.) (DEG. F) 5 932 10 1275 15

• 1411 20 1465 25 1486 30 1494 35 1498

,. 40 1499

(' 45 1500 50 1500 W

ATTACHMENT D

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CASE NO.: 3 -

BUILDING: PEACH BOTTOM UNITS 2&3. TURBINE BUILDING ELEVATION AND AREA DESCRIPTION: 135' CORRIDOR TO THE SWGR. ROOM CASE DESCRIPTION: W1SX3S-EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIREITEMPERATURE'(DEG. F): 1300 WEIGHT OF STEEL MEMBER (LBS./FT.): 3S SURFACE OF STEEL MEMBER HEATED (SQ. FT./FT): 4.87 TIME

• STEEL TEMPERATURE (MIN.) (DEG. F) 5 727 10 1933 15 -

1176 .

20 1242 25 1273 H30 1288 35 1294 40 1297

( 45 50 ~*1299 1299 ,

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l ATTACHMENT D

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