ML20083J119

Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg Elevation 177-Ft HPCI Pump & Turbine Room - Room 109,Fire Area 34

ML20083J119
Person / Time
Site:	Limerick
Issue date:	12/20/1983
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
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References
NUDOCS 8401090688
Download: ML20083J119 (5)

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(([ Professional Loss Control, Inc.

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i STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION I

UNIT 1 Reactor Building El. 177' l

HPCI Pump & Turbine Room Room 109 Fi,re Area 34 i

December 20, 1983 l

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4 8401090688 840104

, PDR ADOCK 05000352 l

E PDR l P. O. Box 446

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

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-A fo .

i LIMERICK GENERATING STATION I

1. AREA DESCRIPTION l Tne area under consideration is the High Pressure Coolant Injection (HPCI)

Pump and Turbine Room, Room 109 on the 177' elevation of the Unit 1 Reactor f

. Building (Fire Area 34). Bounding walls in the area are of reinforced con-l crete construction with an average thickness of 3 ft. The total surface area for heat transfer is 4760 ft2 (see Attachment A for sketch and calcul-ation of areas).

2. COMBUSTIBLE LOADING Combustible loading in the area consists of 155 gallons of lubricating oil contained in the HPCI turbine. For the analysis this quantity was doubled to account for 'possible maintenance activities in the area. A single cable tray having 18 ft2 of surface area and an average combustible loading of 1.5 lbs/ft2 of cable tray surface is located near the east wall of the i r room.

3. VENTILATION PARAMETERS Two watertight doors eacn measuring 3' wide Dy 5'10" high enter the room.

One door is located in the north wall, the other in the south wall.

4. CASES EXAMINED A lube oil fire was assumed in the area involving 310 gallons of lubricat-ing oil. One door entering the area was assumed to be open. This is an i opening area of 17.5 ft2 which results in a ventil& tion controlled maximum heat output of 3426 kW.

5. RESULTS With one door open, the resultirig ventilation controlled heat output of 3426 kW will consume the 310 gallons of fuel in 238 minutes. Due to the excessive fuel quantity, the fire duration was taken to 180 minutes which resulted in a gas temperature of 1149 F (see Attachment B) which is above the critical temperature of the structural steel.

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v The ventilation controlled burning rate of 3426 kW is equivalent to the output from a pool fire with an acea of 11 ft2 (pool diameter of approxi-mately 4 ft). In order to assess the effect of the plume of heated gases above the pool fire on the Structural steel located above the fire, Heskestad* _ relations will be used:

Virtual point source determinatian:

j Zo = -1.020 + .083 Q 4 = 1.01 m Plume temperature at bottom of steel supporting the. room ceiling:

To = 9.1 (T /(gc p2 2)) 333 gc 667 (Z - Zo) 1 67 To = 282*K temperature rise T = 576*F temperature of fire plume The temperature is below the critical temperature for the structural steel.

t It can be concluded that there is no problem due to localized heating as a result of the maximun pool fire that can be supported by the available air flow into the room through a single door. The cable tray in this area is positioned such that it does not present a localized heating exposure to

. structural steel . However, the structural steel in the area will fail due to the overall gas temperature reached if the fire is permitted to Durn for 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.

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' UNIT 1 Reactor Buildin9 El. 177' HPCI Pu:::p & Turbine Room 109 Surface Area Calculation

. Walls Nortn wall (30' x 23') 690 ft2 East wall (28' x 23') 644 ft2 South wall 1058 ft2 l West wall (46' x 23') 1058 ft2 1 3450 ft2 Ceiling l

Area 1 1/2(20' x 20') 200 ft2 l Area 2 (20' x 18') - 160 ft2(Hatch) 200 ft2 j Area 3 (35' x 26') 910 ft2 1310 ft2 Total Surface Area for Heat Transfer 4760 ft2 ATTACHMENT A

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J CASE NUMBER: 1 BUILDING: UNIT.1 REACTOR BUILDING ELEVATION AND. AREA DESCRIPTION: 177' HPCI PUMP AND TURBINE ROOM

, CASE DESCRIPTION: ONE DOOR OPEN LUBE OIL FIRE

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CEILING / WALL' CEILING / WALL Ao Ho Aw Q THICKNESS M ATER I AL (ft) -(ft2) (ft) (ft2) (kW)

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3.0 CONCRETE 17.5 5.8 4760 3417 FIRE IS VENTILATION CONTROLLED j

FIRE DURATION GAS TEMPERATURE (min) (deg.F) 10 326 20 431 l

30 '

512 40 580 50 640 60 694 70 '

744

'80 790 90 833 100 875 110 914 120 951 130 987 140 1022 150 1055 160 1087 170 1118 180 1149 ATTACHMENT B

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