ML20083J073

From kanterella
Jump to navigation Jump to search
Structural Steel Analysis for Limerick Generating Station, Unit 1 Reactor Bldg RCIC Pump Room 108,Fire Area 33
ML20083J073
Person / Time
Site: Limerick 
Issue date: 12/20/1983
From:
PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20083H823 List:
References
NUDOCS 8401090666
Download: ML20083J073 (9)
v • d • e


Text

.-

(([ Professional loss Control, Inc.

STRtlCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building RCIC Pump Room 108 Fire Area 33 December 20, 1983 8401090666 840104 PDR ADOCK 05000352 E

PDR P. O. Box 446 e Oak Ridge, Tennessec 37830 e (615) 482-3541

LIMERICK GENERATING STATION 1.

AREA DESCRIPTION The area under consideration is the RCIC Pump-Room, Room 108, on the 177' elevation of the Unit 1 Reactor Building (Fire Area 33) (see Attachment A for sketch of area). The bounding walls in the area are of reinforced con-crete construction with an average thickness of 2.5 ft. The total surface area for heat transfer is 3820 ft2 (see Attachment A for calculation of areas).

2.

COMBUSTIBLE LOADING Combustible loading in the area consists 80 gallons of lubricating oil con-tained in the RCIC turbine. For the analysis this quantity was doubled to account fo'r possible maintenance activities in the area. A single cable tray having 38 ft2 of surface area with an average combustible loading of 3.6 lbs/ft2 of cable tray surface area is located along the west Wall of the room.

3.

VENTILATION PARAMETERS There are three doors which enter this area. Two watertight doors, eac,h measuring 3' wide by 5'10" high, one d'oor is located in the north wall, the other in the east wall. One 3' wide by 7' high door is located at the entrance to stairwell No. 3.

4.

CASES EXAMINED Three cases were examined each assuming a lube oil fire involving 160 gal-

~

lons of lubricating oil. Case number one assumed one 3' x 5'10" door open, case number two assumed one 3' x 7' door open, and case number three assumed two 3' x 5'10" doors open. All cases assumed that the pre-action sprinkler system does not operate and that no actions are taken by plant personnel to extinguish the fire.

5.

RESULTS Case number one considered only one 3' x 5'10" door open, which corresponds to a ventilation controlled heat output of 3426 kW.

At this heat output 1

the fire would consume the 160 gallons of lube oil in approximately 125 minutes..The gas temperature at this time would be 1193*F which is above the critical temperature of the structural steel (see Attachment B).

The ventilation con 5 rolled burning rate of 3426 kW is equivalent to the heat output'from a pool fire with an area of 11 ft2 (pool diameter of approximately 4 ft),

in order to assess the effect of tne plume of heated gases above the pool fire in the structural steel supporting the ceiling, Hesketad's relations will be used:

Virtual point source determination:

Zo = -1.020 +.083 Q 4 = 1.01 m Plume temperature at bottom of structural steel supporting intermediate grating.

2 ATo = 9.1[T, /(gep g,2)].333 Oc.667 (Z - Zo)4.67 ATo = 283*K temperature rise T = 577*F temperature of fire plume The plume temperature is below the critical temperature of the structural steel.

Case number two considered one 3' x 7' door open which corresponds to a ventilation controlled burning rate of 4504 kW. At this burn rate the 160 gallons of lube oil would be consumed in 50 minutes. The gas tempstrature at this time would be 1004*F which is below the critical temperature of the structural steel (see Attachment B).

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:

i Virtual point source determination:

Zo = -1.02D +.083 0 4 = 1.09 m 2

l f

,-W

Plume temperature at bottom of structural steel supporting ceiling:

ATo = 9.1[Ts /(gc 2 2

p 4 )].333 Oc.667 (Z - Zo)-1.67 ATo = 348'X temperature rise T = 695'F temperature of fire plume-The plume temperature is below the critical temperature of the structural steel.

Case number 3 considered two 3' x 5'10" doors open which corresponds to a ventilation controlled heat output of 6851 kW. At this heat output the fire would consume the 160 gallons of lube oil in approximately 31 minutes. The gas temperature at this time would be 1189'F which is above the critical temperature for the structural steel (see Attachment B).

The ventilation controlled burning rate of 6851 kW is equivalent to the heat output from a pool fire with an area of 21 ft2 (pool diameter of approximately 5 ft).

In order to assess the effect of the plume of heated gases above the pool fire on the structural steel supporting the ceiling, Hesketad's relations will be used:

- Virtual point source determination:

Zo = -1.020 +.083 Q.4 = 1.23 m Plume temperature at bottom of structural steel supporting ceiling:

2 ATo = 9.1[T., /(gcp 3 2)].333 gc.667 (Z - Zo)-1.67 ATo = 482*K temperature rise T = 935'F temperature of fire plume l

The plume temperature is below the critical temperature of the structural l

steel.

The p!ume temperature for all three cases examined is below the critical temperature of the structural steel.

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 air flow into the room.

3 4

~

- = =

w

-'~ ~

~

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

Even though there are no localized h2ating problems, two of the cases examined did result in an overall gas temperaure which was above the criti-cal temperature of the structural steel.

a i

1 4

+

M'w"

l 1

I l

i e

'I i

l N

.I Unit 1 Reactor Building El 177' 3

RCIC Pump Room - Room 108

,i

'?

Surface Area Calculation l

Walls North wall (48' x 23')

1104 ft2 South wall (50' x 23')

1150 ft2 East wall (20' x 23')

460 ft2

!~

West wall (21' x 23')

483 ft2 3197 ft2 I)l' Ceiling Area 1 (23' x 21')

483 ft2 Area 2 (5' x 28')

140 ft2 Total Surf. ace Area for Heat Transfer 3820 ft2 l-(

. 3 ATTACHMENT A l

I

i CASE NUMBER:

1 BUILDING:

UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION:

177' RCIC PUMP ROOM 10G CASE DESCRIPTION *:

ONE 3'x5'10 DOOR OPEN LUBE DIL FIRE g

I co**********************************************************************

CEILING / WALL CEILING / WALL Ao Ho Aw Q

l THICKNESS MATERIAL (ft)

(ft2)

(ft)

(ft2)

(kW) co*********************x**x*xxxx***x**xxuwxxxxx***t*********************

}

-2.5 CONCRETE 17.5 5.8 3820 3426 s

I FIRE IS VENTILATION CONTROLLED l

FIRE DUR ATION GAS TEMPERATURE (min)

(deg.F) 5 297 10 390 15 461 20 521 l

25 574 30 621 35 665 40 706 45 745 50 781 55 816 60 849 65 080 k

70 911 I

75 940 l

80.

969 85 996 90 1023 95 1049 100 1075 105 1099 11 0 1124 115 1147 120 1170 125 1193 1

i ATTACHMENT B

~

1 CASE NUMBER:

3 l

BUILDING:

UNIT 1 REACTOR BUILDING.

ELEVATION AND AR,EA DESCRIPTION:

177' RCIC PUMP ROOM 100 CASE DESCRIPTION:

TWO 3'x5'10 DOORS OPEN LUBE OIL FIRE en************************************************r*********************

i

_j CEILING / WALL CEILING / WALL Ao Ho Aw Q

THICKNESS MATERIAL I

(ft)

(ft2)

(ft)

(ft2)

(kW) nuww************************************x**************************x****

2.5 CONCRETE 35.0 5.8 3820 6851 FIRE IS VENTILATION CONTROLLED i

FIRE DUR ATION GAS TEMPERATURE (min)

(deg.F) 1 275 2

357 3

421 4

474 i

5 521 4

6 564 7

603 8

640 9

67A 10 707 11 737 12 767 1

13 795 14 823 15 849 16 874 17 899 18 923 19 946 20~

969 21 991 22 1013 l

23 1034 24 1055 25 1075 26 1095 27 1114 28 1133 l

29 1152 30 1171 31 1189 i

l t

l 1

f I

ATTACHMENT B l

h I_

I CASE NUMBER:

2 BUILDING:

UNIT 1 REACTOR BUILDING ELEVATION AN" 4REA DESCRIPTION:

177' RCIC PUMP ROOM 100 CASE DESCRIPi10N:

ONE 3'x7' DOOR OPEN LUBE OIL FIRE x o * * * * * * * * * * * * * * * * * * * * *

  • x * * *
  • x * * * * *
  • x x
  • x. x x-x *.x
  • x -x x x x x x
  • x *
  • x x x x x x x a x *
  • x
  • x CEILING / WALL CEILING / WALL Ao Ho Aw Q

THICKNESS MATERIAL (ft)

(ft2)

(ft)

(ft2)

(kW)

PrOMM MW W WW WM *M* MM M X WW X WW-X M W WM MM X WM M W x M X M M X-x M W x E X X X-** M M X W W X WK MX M M X X W WW X 2.5 CONCRETE 21.0 7.0 3820 4504 i

FIRE IS VENTILATION CONTROLLED FIRE DURATION GAS TEMPER ATURE (nin)

(deg,F) 5 368 10 489 15 583 20 662

}

25 731 30 794 35 852 40 906 45 957 50 1004 1

l ATTACHMENT B

.,

Retrieved from "https://kanterella.com/w/index.php?title=ML20083J073&oldid=4365687"