ML20083J085
| ML20083J085 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 11/01/1983 |
| From: | PROFESSIONAL LOSS CONTROL, INC. |
| To: | |
| Shared Package | |
| ML20083H823 | List:
|
| References | |
| NUDOCS 8401090672 | |
| Download: ML20083J085 (17) | |
Text
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(([ Professional Loss Control, Inc.
STRUCIUNAL STEEL ANALYSIS for LIMERICK GENERATING STATION Units 1 & 2 Control Structure El. 217' Switchgear Area Fire Area 2 November 1, 1983 G401090672 840104 PDR ADOCK 05000352 E
PDR 7922 West Chester Piice
- Upper Darby, Pa. 19082 * (215) 853 1700
-- - - ~ * - - '
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LIMERICK GENERATING STATION 1.
AREA DESCRIPTION The area under consideration is the switchgear area on the 217' eleva-tion of the Control Structure (Fire Area 2) (see Attachment A for sketch of area). Bounding walls are of reinforced concrete construction with an average thickness of 3 ft. Total surface area for heat transfer is approximately 13,836 ft2 (1285 m2) (see Attachment A for calculation of areas).
2.
COMBUSTIBLE LOADING Combustible loading in this area consists of cable trays which are stacked three high along the south wall of the room. At three locations the cable trays are joined by several vertical cable trays. There three areas are located at the east side, center, and west side of the south wall and represent the areas of heaviest combustible loading. There are no combustible liquids in this area.
3.
VENTILATION PARAMETERS Three sets of double doors serve this area. Each set has 2 leaves.
The door leaves located in the east and west walls ea:h measura 4' wide by 10' high. The door leaves in the north wall measure 5' wide by 11' high.
4.
CASES EXAMINED Three cases were examined each with a different ventilation parameter i
and a different quantity of cable assumed to be burning. The average 2
combustible loading of the cable trays in this area is 3.5 lbs/ft.
l Case number 1 assumed a spreading cable fire in the center area of cable trays along the south wall, with all doors in the room closed.
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 feet per hour.
The fire will spread east and west along the south wall, a distance of 6 feet in each direction along the cable trays before the original point source dies out after 35 minutes. A maximum surface area of 96 1
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[
ft2 of cable trays (see Attachment B for a list of cable trays) will be invol'ved at any one time, which corresponds to a heat output of 1700 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 at any one time would be less. With all doors leading into the room closed, the only air for combustion will be the air available in the room. The duration of the fire is given by f= 29 Ve (m3) in Q(kW) minutes where the volume of the room is 3686 m3 and Q = 1700. The duration of the fire will be 64 minutes.
Case number 2 assumed the same spreading cable fire as in case 1, with one 4' wide by 10' high door leaf open.
Case number 3 assumed all exposed combustibles in the room burning simultaneously with one 4' wide by 10' high door open. The heat output of this fire would be 10,254 kW and would last for approximately 150 minutes.
5.
RESULTS Case number 1 resulted in a fire temperature of 182*F at 64 minutes which is below the critical temperature for the structural steel (see Attachment C for results of analysis).
Case number 2 resulted in a fire temperature of 256*F when the fire duration was taken to 180 minutes. This temperature is below the criti-cal temperature for the structural steel (see Attachment C for results of analysis). This fire was fuel contrclied, therefore having addi-tional door leaves open would not change the results.
Case number 3 resulted in a fire ttmperature of 1087'F at 150 minutes.
This temperature is below the critical temperature for the structural steel (see Attachment C for results of analysis).
Since the fires evaluated were assumed to occur in the area of heaviest combustible loading, the results are considered to be representatiave for the entire switchgear area on the 217' elevation of the Control Structure.
2
______________.._________m__
The position of cable trays relative to structural steel members were examined throughout the 217' elevation of the Control Structure to assess the potential for localized heating. Cable trays 21CQA and 11CQA i
are located 12 inches below the bottom of structural steel members of l
the following types: W36X230. W36X245, W36X260, W36X300, W33X118, I
W30X99, and W27X84.
l Attachment D contains the results of the calculations performed to determine the reponse of the structural steel to localized heating. The exposure time was taken to be 35 minutes which is the time required for I
the tray to burn to completion. These calculations are conservative because they assume that the entire length of the member is subjected to a temperature of 1500*F when in actuality only a small section of the steel would be subjected to localized heating. As can be seen from the results, the member types W36X230, W36X245, W36X260, and W36X300 will not reach their critical temperature during the 35 minute exposure period. Member types W33X118, W30X99, and W27X84 will exceed their critical temperature within the exposure period. Appendix D includes a sketch of the structural members which will fail due to localized heat-ing.
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LL Control Structure El. 217' Switchgear Area l
l Surface Area Calculation Walls North wall
/126' x 21')
2646 ft2 West wall 56' x 21')
1176 ft2 South wall 126' x 21')
2646 ft2 East wall 56' x 21')
1176 ft2 7644 ft2 Ceiling 126 ' x 56 ' (-20 ' x 16 ' ) - (16 ' x 34 ' )
6192 ft2 Total Surface Area for Heat Transfer 13,836 ft2 (1285 m2)
S ATTACHMENT A
The -following cable trays are present in the center area along the south wall and all of the trays are assumea to be burning simultaneously:
Surface Tray No.
Tray Width (ft)
Tray Length (ft)
Area (ft )
2 21CQA60 2
4.5 9
21CQA59 2
1.5 3
22CPA60 2
4.5 9
1 22CPA59 2
1.5 3
)
20C5060 2
4.5 9
20CSD59 2
1.5 3
11CQA60 2
5 10 11CQA59 2
1 2
12CPA60 2
5 10 12CPA59 2
1 2
10CS060 2
5 10 10CSD59 2
1 2
12CPB 2
6 12 22CPB 2
6 12 96 ft2 i
Heat output with the above cable trays burning simultaneously:
2 96 ft _
_x 190 kW/m2 = 1700 kW 10.76 ft'/m4 1
1 ATTACHMENT B
t I-CASE NUMBER:
1 BUILDING:- CONTROL STRUCTURE UNITS 1 &2 ELEVATION AND AREA DESCRIPTION:
217' SWITCHGEAR AREA CASE DESCRIPTION:
NO DOORS OPEN l
.MOMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMXXMMMXMWWWWWWWMXMMMMMMMMMMMMXX
-CEILING / WALL CEILING / WALL Ao Ho Aw Q
THICKNESS
~ MATERIAL (ft)
(ft2)
(ft)
(ft2)
(kW) i
~
DOM M MM M MM kM X M M M AW M M M M MM X X X-M M M M X X M M M M X M M M X M MMMM M M MM X W X MXM M X M X X K M M MMMMM M X 3.0 CONCRETE 13036 1700 I
NO OPENINGS INTO ROOM FIRE DUR ATION GAS TEMPERATURE (min)
(deg.F) 2 91 4
99 s
6 106 8
til 10 115 12 120 14 123 16 127 18 130 20 133 22 136 24 139 2e 142 28 145 30 147 32 150 l
34 152 36 154 38 157 40 159 42 161 44 163 46 165 48 167 50 169 52 171 54 173 56 175 58 177 160 173 62.
100 64 182 ATTACHMENT C
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CASE. NUMBER:
2 BUILDING:
CONTROL STRUCTURE. UNITS 1 &2 ELEVATION AND AREA DESCRIPTION:
217' SWITCHGEAR~ AREA CASE DESCRIPTION:
DNE DCOR LEAF OPEN 4'x-~10'
- * * * * * *
- x *
- u * * * * * * * *
- x *
- x * * * * *
- r * *
- x x * * * *
- x * * * * *
- x * * *
- x * *
- x. * * * *
- x *, *
- x x x CEILING /WhLL CEILING / WALL Ao Ho Aw Q
THICKNESS MATERIAL (ft)
(ft2)
(ft)
, (ft2).
(kW)
- K w * * *
- M * * * * * * * * * * *
- i x X X * * * * *
- X * * * * * * * *
- W X X * * * * * * *
- X
- X * *
- X;
- x * * * * *
- x *
- X *
- 3.0 CONCRETE 40 10 13836 1700 FIRE IS FUEL CUNTROLLED -
FIRE DURATION GAS TEMPERATURE (min)-
(dog.F) __
10 115 20 133 30 147 4 ()
169 50 169 60 170 70 107 80 195 90 202
[
100 209 1
110 216 120 222 130 229 l
140 234 L
150 240 160 246 170 251 180 256 1
4 ATTACHMENT C
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CASE. NUMBER:
-3
'h BUILDING:
CONTROL STRUCTURE UNITS 1 &2 ELEVATION AND AREA DESCRIPTION:
217' SWITCHGEAR AP.EA CASE DESCRIPTION:
ONE DOOR LEAF OPEN 4'x 10' i
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- x * * * * * * * * * * * * * * * * *
- x x x * * * * * * * * * *
- x x x x x * *
- y: * * *
- x * * * * * * * * -y. x x x
- x
- x *
- x- *
- CEILING / WALL CEILING / WALL Ao Ho AK Q
' THICKNESS M ATER I AL (ft)
(ft2)
(ft)
(,Pt2)
(MW) w o * * * * * * * * * * * * * * * * *
- x * * * *
- x * -x-
- x * *
- x * * * * * * * * * * * * * * *
- x *
- a k.
- x
- u x * * -x * * * * * *
- 3.0 CONCRETE 40 10 133?6 10254 i:
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FIRE DURATION GAS TEMPERATURE
~
(min)
( d eg. F )
g a
10 335
-i 20 443 30 526
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40 596 i ;
e 50 658 60 714 70 765 80 013 90 858 i
3 100 901 y
110 941
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120 980 130 1017 N
140 1053
't 150 1087 b
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ATTACHMENT C
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CASE NUMBER:
1 BUILDING:- CONTROL STRUCTURE UNITS 1 &2 ELEVATION AND-AREA DESCRIPTION:
217' SWITCHCEAR AREA CASE DESCRIPTION:
LOCALIZED HEATING OF MEMBER TYPE W36x230 EFFECTS OF LOCAL. HEATING ON STRUCTURAL STEEL FIRE. TEMPERATURE- (deg. F):
'1500 WEIGHT OF STEEL MEMBER (1bs./ft):
230
' SURFACE OF STEEL MEMBER HEATED (sq.ft./ft):
9.84 TIME STEEL TEMPERATURE
( M in ) '
(deg.F) 5.00-310 l
10.00 511 1
15.00 670 l
20.00' 817 25.00 932' 30.00 1028 35.00 1108 I
ATTACHMENT D
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2
~
BUILDING:
CONTROL STRUCTURE UNITS l' & 2 ELEVATION-AND ANEA DESCRIPTION:
217' SWITCHGEAR AREA CASE. DESCRIPTION:
LOCALIZED. HEATING OF HEMBER TYPE W36x245 EFFECTS-OF L OCAL HEATING ON-STRUCTURAL STEEL FIR E. TEMPER ATURE (deg. F):
1500 WEIGHT OF STEEL MEMBER (1bs./ft):
245
-SURFACE OF STEEL MEMBER HEATED (sq.ft./ft):
9.87 TIME STEEL TEMPERATURE (Min)
(deg,F) 5.00 296
.10.00
-407 15.00 649 20.00 784 25.00
.098 30.00 994 35.00 1074 S
4 ATTACHMENT D
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g CASE. NUMBER:
3-BUILDING: ' CONTROL STRUCTURE UNITS 1 & ~ 2' ELEVATION AND'ANEA DESCRIPTION:
217' SWITCHGEAR AREA CASE'. DESCR IPTION :
LOCALIZED HEATING OF MEMBER TYPE W36x260 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL'-
. FIRE TEMPERATURE (deg. F):
1500 L-WEIGHT 0F' STEEL MEMBER (1bs./ft):-
260 SURFACE OF STEEL MEMBER HEATED (sq.ft./ft):
-9.90 TIME STEEL TEMPERATURE
-(Min)
(deg.F) 5.00 283 10.00 466 15.00 622 L
20.00 754 25.00 866 30.00 961 35.00 1042 O
4 ATTACHMENT D
' L.
CASE NUMBER:
-- 4 BUILDING:'-CONTROL STRUCTURE ~ UNITS 1-& 2 ELEVATION AND A#EA DESCRIPTION:
217'.SWITCHGEAR AREA CASE DESCRIPTION:
LOCALIZED. HEATING OF MEMBER TYPE W36x300.
L EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE (deg. F):.
1500 WEIGHT.0F STEEL MEMBER (lbs./ft):
300
- SURFACE OF STEEL MEMBER HEATED (sq.ft./ft):
9 99
~ TIME STEEL' TEMPER ATURE
( riin )
(deg.F) t i:
5.00 256 10.00 420 i
15.00 562 l
20.00 685 25.00 792 30.00 886 35.00 966 y
9 l
s ATTACHMENT D m
CASE NUMBER:
5 BUILDING: ' CONTROL STRUCTURE UNITS 1 &2
-ELEVATION AND AREA ~ DESCRIPTION:
217' SWITCHGEAR AREA CASE DESCRIPTION:
LOCALIZED' HEATING OF HEMBER TYPE W33x113 EFFECTS OF LOCAL HEATING ON STRUCTURAL GTEEL FIRE TEMPERATURE. (deg. F):
1500
~ WEIGHT'0F STEEL < MEMBER (lbs./ft):
110 SURFACE OF STEEL MEMBER HEATED (sq.ft./ft):
8.15 TIME STEEL TEMPERATURE (min)
(deg.F) 3.00 459
' 10'.00 743 15.00 949 20.00 1099
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25.00 1209 30.00 1288 35.00 1346 se e
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ATTACHMENT D
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O, CASE. NUMBER:
7 BUILDING:
CONTROL STRUCTURE UNI.TS 1 &2 ELEVATION AND AREA DESCRIPTION:
217' SWITCHGEAR AREA CASE DESCRIPTION: ' LOCALIZED HEATING OF MEMBER TYPE W27x84 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE (deg. F):
1500 WEIGHT OF STEEL MENDER (1bs./ft):
84 SURFACE OF STEEL MEMBER HEATED ( sq. f t. /.'t ) :
6.78 TIME STEEL TEMPERATURE (Min) i
. (deg.F)
~5.00
~524 10.00 835 15.00 1047 20.00 1192 25.00 1290 30.D0 1357 35.00 1403
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ATTACHMENT D
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-CASE NUMBER:
6
-BUILDING:
CONTROL STRUCTURE UNITS 1 &2 ELEVATION AND AREA ~ DESCRIPTION:- 217' GWITCHGEAR AREA
-CASE DESCRIPTION:
LOCALIZED HEATING OF MEMBER TYPE W30x99
' EFFECTS 0F LOCAL HEATING ON STRUCTURAL STEEL a
FIRE TEMPEoATURE (deg. F ) :..
1500
, WEIGHT OF' STEEL. MEMBER (lbs.7ft):
99 SURFACE '0F STEEL MEMBER -HEATED (sq.ft./ft):
7.37 TIME STEEL TEMPERATURE (min)
-( deg.F) -
5.00 "409 10.00 786 15.00 996 20.00-1144 25.00 1249 30.00' 1323 35.00-1375 e
e ATTACHMENT D
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