ML20083H971

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 201-Ft Cooling Water HX Area Room 207,Fire Area 41

ML20083H971
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
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References
NUDOCS 8401090599
Download: ML20083H971 (10)

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(([ Professional Loss Control, Inc.

STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 201' Cooling Water HX Area Room 207 Fi,re Area 41 l

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December 20, 1983 l

l 8401090599 840104 PDR ADOCK 05000352 E PDR l

P. O. Box 446

• Oak Ridge. Tennessee 37830 * (615) 482-3541

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LIMERICK GENERATING STATION

1. AREA DESCRIPTION The area under consideration is the Cooling Water Heat Exchanger Area Room 207 on the 201' elevation of the Unit 1 Reactor Building (Fire Area 41).

The bounding walls of the area are of reinforced concrete construction with an average thickness of 3 ft. The total surface area for hest transfer is 8985 ft2 (see Attachment A for sketch and calculation of surface areas).

2. COMBUSTIBLE LOADING Combustible loading in this area consists of cable insulation located in cable trays. The total surface area of cable trays is 702 ft2 with an average combustible loading of 3.5 los/ft2 of cable tray surface area.

There are no combustible liquids in this area.

3. VENTILATION PARAMETERS There are two doors which enter this area. Both measure 3' wide by 7' nigh.

One door is located in the east wall and the other is located in the west wall and enters stair No. 2.

4. CASES EXAMINEn Two cases were examined, each assuming that all the cable trays in the area were burning simultaneously. Case number one assumed one door open while case number two assumed both doors open.

5. RESULTS Case number one assumed all cables burning simultaneously witn one 3' x 7' door open. This resulted in a ventilation controlled fire with a burning rate of 4504 kW and a duration of 90 minutes. The gas temperature at this time would be 601*F which is below the critical temperature of the struc-tural steel (see Attachment B).

Case number two assumed all cables burning simultaneously witn both 3' x 7' doors open. This resulted in a ventilation controlled fire with a burning rate of 9008 kW and a duration of 45 minutes. The gas temperature at this time would be 820 F which is below the critical temperature of the struc-tural steel (see Attachment 3).

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The position of cable trays relative to structural members were examined throughout the area in' order to assess the potential for localized heating.

Cable tray 10CQA is located within 12 inches of member types W27X84, W21X44, W18X40 and W27X102.

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Attachment C Contains the results 'of Calculations performed to determine the response of the structural steel members to localized heating. Tnese calculations are conservative because they assume that the entire lengtn of the structural steel member is subjected to a temperature of 1300*F when',

- in actuality, only a small section of the steel would be subjected to

' localized heating. As can be seen from the results, none of the members exceeded the single point failure temperature of 1300*F during the 35 minute exposure period (time required for tray to burn to completion),

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Unit 1 Reactor Building El. 201' Cooling Water heat Exchanger Area Room 207 Surface Area Calculation Wall s North wall (95' x 15') 1425 ft2 East wall (132' x 15') 1980 ft2 South wall (33' x 15') 495 ft2 West wall (105' x 15') 1575 ft2 5475 ft' Ceiling Area 1 (12' x 48') 576 ft2 Area 2 (19' x 11') 209 ft2 Area 3 (29' x 74') - (18' x 8') 2002 ft2 Area 4 1/2(48')(32') 768 ft2 3 55 ft' Total Surface Area for Heat Transfer 9030 ft2 s

ATTACHMENT A

bnSt i4UMSER 1 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 201' COOLING WATER HX AREA ROOM 207 CASE DESCRIPTION: ONE DOOR OPEN ALL CABLES BURNING

• • o***x**********************x*****x************xxxx***********x***x****

CEILING / WALL CEILING / WALL Ao Ho Aw Q THICKNESS MATER I AL (ft) (ft2) (ft) (ft2) (kW)

• • • • • • • • • • • • • • • x**xxxxxx**********xxx**xxx*******xx*******xx**xx*xxxxx**

3.0 CONCRETE 21.0 7.0 9030 4504 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPER ATUR$

(nin) (deg,F) 5 197 10 249 15 288 20 322 25 351 30 378 35 402 40 425 45 446 50

• 466 55 486 60 504 65 522 70 539 75 555 80 571 05 586 90 601 ATTACHMENT S

' CASE' NUMBER: 2 BUILDING: UNIT 1 REACTOR BUILDING

. ELEVATION AND AREA DESCRIPTION: 201' COOLING WATER HX AREA ROOM 207 CASE DESCRIPTION: TWO DOORS OPEN ALL CABLES BURNING en**********************************************************************

CEILING / WALL -CEILING / WALL Ao Ho Aw Q THICKNEES MATERIAL (ft) (ft2) (ft) (ft2)

• n**********r*************************************x**************x(*kW) 3.0 CONCRETE 42.0 7.0 9030 9000 FIRE IS FUEL CONTROLLED

. FIRE DURATION GAS TEMPERATURE (nin) (deg.F) 5 322 10 425 15 504 20 571 25 630 30 683 -

35 732 40 778 45 820 i 4

l ATTACHMENT S

s CASE. NUMBER: 1 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 201' COOLING WATER HX AREA ROOM 207 CASE DESCRIPTION: LOCALIZED HEATING OF MEMBER TYPE W10x40 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE (deg. F): 1300 WEIGHT OF STEEL MEMBER (1bs./ft): 40 SURFACE OF STEEL MEMBER HEATED (sq.ft./ft): 4.38 TIME STEEL TEMPERATURE (min) (deg.F) 5.00 601 10.00 903 15.00 1075 20.00 1172 25.00 1227 30.00 1259 35.00 1277 e

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ATTACHMENT C

CASE NUMBER: 2 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 201' COOLING WATER HX AREA ROOM 207 CASE DESCRIPTION: LOCALIZED HEATING OF MEMBER TYPE U21x44 EFFECTS OF LOCAL HEATING ON STRUCTUR AL STEEL FIRE TEMPERATURE (deg. F): 1300 WEIGHT OF STEEL MEMBER (1bs./ft): 44 SURFACE OF STEEL MEMBER HEATED (sq.ft./ft): 4.94 TIME STEEL TEMPERATURE (min) (deg.F) 5.00 614 10 .00 910 15.00 1008 20.00 1102 25.00 1234 30.00 1263 35.00 1280 l

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ATTACHMENT C

CASE NUMBER: 3 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 201' COOLING WATER HX AREA ROOH 207 CASE DESCRIPTION: LOCALIZED HEATING OF MEMBER TYPE W27x84 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE (deg. F): 1300 l WEIGHT OF STEEL MEMBER (1bs./ft): 84

' SURFACE OF STEEL MEMBER HEATED (sq.ft./ft): 6.70 TIME STEEL TEMPERATURE (min) (deg.F) 5.00 461 10.00 728 15.00 911 20.00 1035 25.00 1119

30.00 1177 35.00 1216 r

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ATTACHMENT C

CASE NUMBER 4 DUILDING: UNIT 1 REACTOR BUILDING ELEVATION'AND AREA DESCRIPTION: 201' COOLING WATER HX AREA ROOM 207 CASE DESCRIPTION: LOCALIZED HEATING OF MEMBER TYPE W27x102 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPER ATURE (deg . F): 1300 WEIGHT OF STEEL MEMBER (1bs./ft): 102 SURFACE OF STEEL MEMBER HEATED (sq.ft./ft): 6.05

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TIME STEEL TEMPERATURE (min) (deg,F) 5.00 395 10.00 635 15.00 811 20.00 941 25.00 1036 30.00 1106 35.00 1158 ATTACHMENT C