ML20083J026

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Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 177-Ft RHR HX & Pump Room - Room 102,Fire Area 32
ML20083J026
Person / Time
Site: Limerick Constellation icon.png
Issue date: 12/20/1983
From:
PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20083H823 List:
References
NUDOCS 8401090637
Download: ML20083J026 (7)
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STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 177' RHR Heat Exchanger and Pump Room - Room 102 Fire Area 32 December 20, 1983 9401090637 840104 PDR ADOCK 05000352 E PDR P O. Box 446 e Oak Ridge, Tennessee 37830 * (615) 482-3541

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LIMERICK GENERATING STATION

1. AREA DESCRIPTION The area under consideration is the RHR Heat Exchanger and Pump Room, Room
102, on the 177' elevation of the Unit 1 Reactor Building (Fire Area 32) j (see Attachment A for sketch of area). The bounding walls of the area are j- of reinforced concrete construction with an average thickness of 3 ft.

8 The total surface area for heat transfer is 7848 ft2 (see Attachment A for calculation of areas).

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2. COMBUSTIBLE LOADING Combustible loading in the area consists of 72 gallons of lubricating oil contained in the RHR pump motors. For the analysis this quantity was doubled to account for possible maintenace activities in the area. There are two cable trays in the room - one located along the east wall, the other along the west wall. The total surface area of the cable trays is 52 ft2 with an average combustible loading of 1.'i lbs/ft2 of cable tray surface. ,

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3. VENTILATION PARAMETERS -

There are four doors which enter the area. Two watertight doors measuring 3' wide by 5'10" high enter the area on the 177' elevation and two steam-tight doors measuring 3' wide by 7' high enter the area on the 201' eleva-tion.

4. CASES EXAMINED Two cases were examined, each assuming a lube oil fire involving 144 gal-lons of lubricating oil. Case number one assumed the lube oil fire with one

-steamtight door open and case number two assumed both steamtight doors open.

5. RESULTS Case number one considered only one 3' x 7' door open which corresponds to

, a ventilation controlled haat output of 4504 kW. At this heat output the

} fire would consume the 144 gallons of lube oil in 85 minutes. The gas temperature at this time would be 664*F, which is below the critical temperature of the structural steel (see Attachment B).

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The ventilation controlled burning rate of 4504 kW is equivalent to the heat output from a pool fire with an area of 14 ft2 (pool diameter of approximately 4 ft). In order to assess the effect of the plume of heated gases above the pool fire on the structural steel supporting the intermedi-ate grating at the 201' elevation, Hesketad's relations will be used:

l Virtual point source determination:

Zo = -1.020 + .083 0 4 = 1.09 m Plure temperature at bottom of structural steel supporting intermediate grating.

ATo = 9.1[T ,/(gc pf 2 ,,,2)].333 Oc .667 (Z - Zo)-1.67 ATo = 348*K temperature use T = 695"F temperature of fire plume

. i The plume temperature is below the critical temperature of the structural steel.

Case number two considered both 3' x 7' doors open which corresponds to a ventilation controlled burning rate of 9008 kW'. At this heat output the fire would consume the 144 gallons of luue oil in 44 minutes. The gas

temperature at this time would be 923*F which is below the critical ,

temperature of the structural steel (see Attachment B).

The ventilation controlled burning rate of 9008 kW is equivalent to the heat output from a pool fire with an area of 28 ft2 (pool diameter of approximately 6 ft). In order to assess the effect of the plume of heated gases above the pool fire on the structural steel supporting the intermedi-ate grating at the 201' elevation, Hesketad's relations will be used:

Virtual point source determination:

Zo = -1.020 + .083 0 4 = 1.32 m l Plume temperature at bottom of structural steel supporting intermediate grating.

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r aTo = 9.1[Tg /(gcp2 j ,2)].333 Oc .667 (Z - Zo)-1.67 i oTo = 597'X temperature rise

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T = 1194*F temperature of- fire plume l The plume temperature is below the critical temperature of the structural I steel.

i The= plume temperature is below the critical temperature of the structural steel for both cases. It is concluded that there is no problem due to localized heating of the structural steel as a result of the maximum pool fire that can be supported by the available airflow into the room through two open doors.

The cable trays in this area were positioned such that they did not present a localized heating exposure to the structural steel, i

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I IJnit 1 Reactor Building El. 177' RHR Heat Exchanger and Pump Room 102

! Surface Area Calculation Walls North wall (32' x 40') 1280 ft2 South wall (52' x 40') 2080 ft2 East wall (29' x 40') 1160 ft2 West wall (52' x 40') 2080 ft2 6600 ft2 Ceiling for area is at elevation 217' Ceiling (24' x 52') 1248 ft2 Total Stiface Area for Heat Transfer 7848 ft2 11 ATTACHMENT A l

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CASE NUMBER: 1 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 177' RHR HX & PUMP ROOM 102 CASE DESCRIPTION: ONE 3'x7' DOOR OPEN LUBE OIL FIRE cowwwww********************uwwwwwww*************************************

CEILING / WALL CEILING / WALL Ao Ho Aw -

O THICKNESS MATERIAL i (ft) (ft2) (ft) (ft2) (kW)

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3.0 CONCRETE 21.0 7.0 7840 4504 FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPERATURE (min) (deg F) 5 216 10 275 15 321 -

20 359 25 393 30 424 35 452 40 -

478 45 , 503 50 526 55 548 60 569 65 589 70 609 75 628 80 646 85 664 ATTACHMENT B

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CASE NUMBER: 2' BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 177' RHR HX & PUMP ROOM 102 CASE DESCRIPTION 1 TWO 3'x7' DOORS OPEN LUBE OIL FIRE L

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! CEILING / WALL CEILING / WALL - Ao Hc Aw 0

! THICKNESS MATERI AL (ft) (ft2) (ft) (ft2) (kW) f g oc**********************************************************************

3.0 CONCRETE 42.0 7.0 7848 9008 FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPER ATURE (min) (deg.F) 4 330 8 436 12 517 16 586 20 646 24 701 28

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798 36 842 40 884 44 923 l

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ATTACHMENT B l- . -_

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