ML20083J100
| ML20083J100 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 11/01/1983 |
| From: | PROFESSIONAL LOSS CONTROL, INC. |
| To: | |
| Shared Package | |
| ML20083H823 | List:
|
| References | |
| NUDOCS 8401090679 | |
| Download: ML20083J100 (8) | |
Text
o 9
(([ Professional Loss Cor: trol, Inc.
STRUCTURAL STEEL ANALYSIS for
, LIMERICK ATOMIC GENERATING STATION Unit 1 Reactor Building, El. 253' General Floor Area Fire Area 45A November 1, 1983 )
8401090679 E40104 PDR ADOCK 05000352 E PDR 7922 West Chester Pike
- Upper Darby, Pa. 19082 * (215) 853-1700
. s LIMERICK GENERATING STATION
- 1. AREA DESCRIPTION The area.under consideration is the general floor area on the 253' ele-vation of the Unit 1 Reactor Building (Fire Area 45A). The heaviest combustible loading encountered on this elevation is found in the CRD Hydraulic Equipment Area and- Neutron Monitoring System Area. The area of heaviest combustible loading is bounded by column lines 19.4 & 23 and J & Fa (see Attachment A for a sketch of the area under considera-tion). The total surface area for heat transfer is approximately 11,774 ft .2 The bounding walls are constructed of reinforced concrete with an average thickness of 1.5 ft.
- 2. COMBUSTIBLE LOADING -
The heaviest concentration of cabling found within this area was along the east wall. The average combustible loading of the cable trays in this area is 4.7 lbs/ft2 of tray surface area. There are no combustible liquids in this area. Enclosed combustibles are not included in the combustible loading.
- 3. VENTILATION PARAMETERS The area under consideration is open to the remainder of this elevation on its south side. This opening is approximately 28.5 ft. wide and 29 ft. nigh.
- 4. CASES EXAMINED A spreading cable fire was assumed to originate in the area of heaviest cable concentration in order to present the worst case. 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 north and south along the east wall and westward a distance of 8 feet in each direction along the cable trays before the original point source dies out after 47 minutes. A maximum surface area of 386 ft2 of cable trays (see Attachment B for a list of trays) will be involved at any one time, which corresponds to a hea't output of 6816 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 would be less since the quantity of cabling involved at any one time would be less.
1
l ~.
f 6
- 5. RESULTS The fire duration was taken to be 180 minutes and the fire temperature reached after 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> was 940*F which is below the critical temperature for the structural steel (see Attachment C for results of analysis).
Since the fire is assumed to occur in the area of heaviest combustible loading, the results are con'sidered to be representative for the entire general floor area on the 253' elevation of the Reactor Building.
The positions of cable trays relative to structural steel members were examined' throughout the 253' elevation of the Reactor Building in order to assess the potential for localized heating. Cable tray 1AGYO5 is located 12" below the bottom of a girder type G-52 (54WF366).
Attachment 0 contains the results of calculations performed to deter-mine the response of the girder to localized heating. These calcula-tiens are conservative because they assume that the entire length of the girder is subjected to a temperature of 1500 F when in actuality only a small section of the steel would be subjected to localized heat-ing. As can be seen from the results, the girder does not reach its single point failure temperature of 1300*F during the 50 minute expo-sure period (time required for a tray to burn to completion).
e 2
.._;1. l ' '
I LJ l I O
a l
Il N . . L 1
r w y\\@ i l
b ==
t ,
l 9
\i s i I g
_.L '
i f , 1-~i I I 1 i j . 0 81 ~
\ M- r r -i .
, l. , t s\ f .
l t
L I
4/
c 7 0
.9 Unit 1 Reactor Enclosure 253' El.
Surface Area Calculation
-Walls North wall above Neutron Mon. (18' x 19') 342 ft2 North wall Neut. Mon. to Stairway (35' x 28.5') 997.5 ft2 North wall stairwell (8' x_28.5') - (3' x 7') 207 ft2 East wall _ (67' x 28.5') 1909.5 ft2 Column North & South Faces East Wall- (16'x28.5') 456 ft2 Dryweli Access Wall Drywell wall above Neutron Mon. (16' x 28.5') 456 ft2 (22' x 19') 418 ft2 Drywel.1 wall from Neut. Mon. to Access (49' x 28.5') 1396.5 ft2 Neutron Monitoring Walls (63' x 9.5') - (3' x 7') 577.5 ft2 6969 ft2 ATTACHMENT A .
-e.* m- -n--,,ww y
i, . ,
I ~ Ceiling -
Area 1 (27' x 11') 297 ft2 Area 2 -
1/2(27' x 41') - 240 ft2 313.5 2 Area'3 (46' x 74') 3404ft{t Area 4 1/2(22' x 6') - 21 f t2 45 ft2 Area 5 (4' x 61') 244 ft2 i 3.rea 6 (4' x 4') 16'ft2 Area 7 (4' x 42') 168 ft2 Area 8 (21' x 12') 252 ft2 Area 9 1/2(11' x 12') 66 ft2 4805.5 ft2 Total Surface Area for Heat Transfer = 11,774 ft2 h .
O ATTACHMENT A
l The following cable trays are present in' the area defined for the source fire and all of the trays are assumed to be burning simultaneously:
Surface
-Tray No. Width (in) Length (ft) 2 IDCPA79 24" Area (ft )_
2' 4
' 10CAA74 24" 16' 32 10CVA72 24" 5' 10 10CBA72 24" 10' 20 10CQA21 24" 12' 24 11CCA21 24" 16' 32 10CZA21 24" 9.5' 19 10CPA74 24" 7' 14 1 CDP A75,76,78 24" 5' 10 10CQA76 24" 11' 22 11CLA74 24" 11' 22 10C0A74 24" 11' 22 10lYA74 24" 11' 22 10CZA74 24" 8' to 11CCA74 24" 8' 16 10CBA74 24" 8' 16 10C0B13 24" 11.5' 23 10lYB13 24"
- 15' 30 10 COB 12 24" 8' 16 10lYB12 24" 8' 16 386 ft2 Average Combustible Loading per Tray Surface Area = 4.7 lb/ft2 Fire Duration for Free Burning Cholg Tray Fire =
4.7 lb/ft + 0.1 l b = 47 minutes ft'/ min Heat output with all trays in source fire area (above) burning simultaneously:
386 ft2 _ x 190 kW/m2 = 6816 kW 10.76 ft'/m'
/
ATTACHMENT B f
.. _ _ _ - _ _ - _ _ _ _ _ _ - -_. .___l
CA$if NUMBER : 1
. BUILDING: REACTOR ENCLOSURE UNIT 1 ELEVATION AND AREA DESCRIPTION: 253'EL. NORTHEAST CORNER CASE DESCRIPTION: SPREADING CABLE FIRE
- x******
, . CEILING / WALL . CEILING / WALL' Ao Ho Aw . Q-THICKNESS- -MATERIAL (ft) (ft2) (ft) (ft2) (kW) 1.5 CONCRETE 826 29 11774 6G16 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE
+: (min) (deg F) 10 277 20 362 30 427 40 "
482 50 530 60 573
-70 614 80 651 90 686 100 719 110 751 120- 781 ,
130 810 140 838 150 865 160- 891 170 916 100 940 i
O ATTACHMENT C e
d
- hmmun masula e i i ie i - - - . - - - - - - - - - . - - .
- . _ = - - -.
CASE NUMDER: 1 BUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND Af(EA DESCRIPTION: 253' GENERAL FLOCR AREA CASE DESCRIPYION: LOCALIZED HEATING OF MEMBER TYPE G-52 (54WF366)
EFFECTS OF LOCAL HEATING ON STRUCTUR AL STEEL FIRE TEMPER ATURE (aeg. F): 1500 WEIGHT OF STEEL MEr1 DER (lbs./ft): 366 SURFACE OF STEEL MEMBER HEATED (sq.ft./ft): 13.30 TIME STEEL TEMPERATURE (nin) (deg.F) '
5.00 274 10.00 450 15.00 600 20.00 729 25.00 040 20.00 935 35.00 1016 40.00 1005 45.00 1145 50.00 1196 4
ATTACHMErlT D
-. .. y
. J.
(([ Professional Loss Control, Inc.
STRUCTURAL STEEL ANALYSIS for LIMERICK GENERATING STATION Unit 1 Reactor Building El. 283' 1
General Floor Area Fire Area 47A November 1, 1983 Dub
.DH4fod46 7922 West Chester Pike e Upper Darby, Pa. 19082 * (215) 853-1700
r - o
- 9 LIMERICK GENERATING STATION
- 1. AREA DESCRIPTION The area under consideration is the general floor area on the 283' eleva-tion of the Unit 1 Reactor Building (Fire Area 47A). The heaviest combusti-ble loading encountered on this elevation is found in the northeast corner.
The area of heaviest combustible loading is bounded by column lines 20 & 23 and J & H (see Attachment A for sketch of area). Bounding walls are of reinforced concrete construction with an average thickness of 3 ft. Total 2
surface area for heat transfer is 6947 ft (645 m2) (see Attachment A for calculation of areas).
- 2. COMBUSTIBLE LOADING The heaviest concentration of cabling found within this area is located five feet to the west of column line 21.5. The average combustible loading of the cable trays in this area is 4 lbs/ft2 of tray surface area. There are no combustible liquids in this area. Enclosed combustibles are not included in the combustible loading.
- 3. VENTILATION PARAMETERS The area under consideration is open to the remainder of this elevation on its south side, however, there are several rooms at floor level that extend a height of 12 ft from the floor. This leaves a ventilation opening above these rooms approximately 54' wide by 17' high.
- 4. CASES EXAMINED A spreading cable fire was assumed to originate in the area of heaviest cable concentration in order to present the worst case. 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 is assumed to extend along the north wall and southwest, a distance of 7 feet before the original point source dies out after 40 minutes. A maximum surface area of 172 ft2 of cable trays (see Attachment B for list of cable trays initially burning) will be involved at any one time, which corresponds to a heat output of approximately 3050 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 would be less because concentrations of cabling that would be involved at any one time would be less.
1 a
(.i:;,j ', l 1:N Q $. % W :..; O -N ! b :. W Y h !~ 5 ' ~ O W N "W ' ' ! $ A 5 U ' Y $$h.-
,( y ,
[ -:j ,. 5
. y .j
- y 1
.j,-
L-y-
.z: 5. RESULTS xiP.'
li V The fire was assumed to last 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> with no action taken by plant per-2"c f-i
'4..o.,;-;j sonnel to extinguish the fire. The peak gas temperature reached was fg.,
x
'.).f j 731*F (see Attachment C) which is below the critical temperature for Mw- i M
p , -: "... the structural steel. Since the fire was assumed to occur in the area ?N q.
4s of heaviest combustible loading, the results are considered to be J k- . representative for the entire general floor area on the 283' elevation l.p ;,. . .
of the Reactor Building.
f
?s %ca s. , 4' p%.<
'% l' - -
1 The position of cable trays relative to structural steel members were .
, 1' examined throughout the 283' elevation of the Reactor Building in order r.y29.y ,p to assess the potential for localized heating. Cable trays were encoun-4,
,.? ,a(.' , ,
tered within 1 foot of type 36WF230 beams in numerous locations. Cable M. ,
f f ,' trays ICCRA, ICCTA, IMIAB, and 1ACYA were positioned 12 inches below a f
p/. 18WF45 beam located northeast of the drywell near column line 20. .h
- p. . 3.
l f ..t 'i . ..
1 Attachment 0 contains the resu'ts of calculations performed to deter- ?, -
Jgp mine the response of the structural members. The exposure time for the p-Yb k localized heating was taken to be 40 minutes which f s the time required '
,,3
,pa. 5 : for a tray to burn to completion. As can be seen from the results, the $a w -
.?j?f] member types 36WF230 will not reach their critical temperature during ?f, j the 40 minute exposure ;'eriod. The member type 18WF45 will exceed its n*.. .:k.A, critical temperature well within the exposure period. Appendix 0
.i -
A
[k includes a sketch showing the location of the structural member which '
%f - will fail due to localized heating effects. R.
3.s.g- y
..; y s
. ' ~.pk,,- '-
[ti
" .L. . i ~ .k-/
,3 A
,j.
b Ij ,'I 3 .
.3 e i r. -a-3
- n
-, # f.' .' ..
3 y, kQ.
,p e
.). '
.p a n ,6 +
f ';) Q u ~ -p n llt
, aj.,. '
}-- , ,
c.
f ,
$.c y. :: 2 %
2
.. . , h '
-A
.. f+
- w. .
- s
- .J{ "P
.4
- 4
~I.j C
~.'N ., 1 , 'Y
- ., :f
y
[
El-tv-
~1; i l en i
[ !
E- l I I
._J :_
h ----_-___
y l
_ l~
) '
i
\ l
.---.._(d.._ _.f [.
Unit 1 Reactor Building El. 283' Surface Area Calculation Walls North wall (61' x 29') 1769 ft2 South wall (48' x 12') 576 ft2 East wall (44' x 29') 1276 ft2 West wall (46' x 29') 1334 ft2
~
4955 ft2 Ceiling
/ ea 1 (30' x 60') - (18' x8' stairwell) 1656 ft2 Area 2 (24' x 14') 336 ft2 1992 ft2 Total Surface Area for Heat Transfer 6947 ft2 (645 m2) kTTACHMENT A
i
\
%# # + IMAGE EVALUATION
((///
5 ,
// TEST TARGET (MT-3) 6
// ,
+ .
=
1.0 Em Baa
- 5 88 LE
! l.l !. EE i 4;, l.8 f _
l.25 1.4 1.6 3
i
< 150mm >
a jm < 6" >
ll h
- y%f4 // A4
!#+v.
2 o
7/
<>#+s+
m 5 -
A 'd= . . . . . . _
-~. ,
- b i Cable Trays The folidwing cable trays are present in the area defined for the source fire and all of the trays are assumed to burn simultaneovely.
Surface Cable Tray No. Tray Width (in) . Tray Length (ft) Area (ft2)__
IM1AC01-02 24 16 30 1M1AD01-02 24 15 30 1M1AE01-02 24 15 30 10CVA18 24 15 30 ,
101SA73 24 2 4 IBCWA91 24 7 14 1BCWA92 24 5 10 1BCWA80 24 7 14 1BCWA75 24 5 10 172 172 ft2 _ x 190 kW/m2 = 3050 kW 10.76 ft'/m' Average Combustible Loading per Tray Surface Area = 4.0 lb/ft2 Fire Duration for Free Burning Tray Fires = .
4.0 lb/ft2 + 0.1 lb = 40 minutes ft'/mir.
ATTACHMENT B
V -.
i CASE NUMBER:- 1
' BUILDING UNIT 1 REACTOR BUILDING ELEVATION:AND AREA DESCRIPTION: 203' NORTHEAST CORNER
. CASE' DESCRIPTION: ONE OPENING SPREADING CABLE FIRE 00*********************************************************x**x****x****
CEILING / WALL CEILING / WALL ~Ao Ho Aw Q -
~THICXNESS MATERIAL (ft) (ft2) (f t) (ft2) (kW)
- x.**x***********-x**********************************************x.********
3.0 CONCRETE .918 17. 6947 3050
~
FIRE IS ' FUEL C0NTROLLED FIRE DURATION GAS TEMPERATURE (min) (deg.F)
' 10 ' 228 20 -
292 30 341 40 383 50 419 60 452 70 483 80 511 90 538' 100 '563 110 587 ^
120 610 130 632 140 653 150 673 160 693 170 712 180 731 O
O 4
~
ATTkCHMENTC m.
x . ..
r M.I! ~ ! ,
6,/ ,' !$N I E iFn 4'
I C f-<
1 ~~ ~ ~ \ s l'O -x-OG rit f' l - Z - Es s I ,v .
sc
'i
-}! % 4H3V11V I t, [9 6i i dt,'b)2ElGV.1 i lli. i mI llT-El t . . . . . .
l
~3 i!. ( ' , -A - C6F vgl ' I - 6.' s 73 M j l
\ ,.O -S/ I hi k
~ ,,' O) i' Gol-X E*12t2 -X- 0G t V t.,1 % '
~
Z- 97 tlN m 9px ?tM dl >
8% $'---
n ,-6 : i =
iQ 6,/-) Bij n I 57Er.1 l I'
~
'Q ,E*5
'5 ',y-X-O&vve, I - 3I - @L
- VZ M QY ius T
%.?
b 5
~
E l
-h.. jS S OrI-) . . , n :ney.l.
lfL3 N t% Y WM l 95 x 13 M % \
We gm. sy u[a '.
h '., \
u, -r_+ b S < ( a, y o p
- a. qN1 p/g// nu /
+ .
v.
% ,/ ,/ o /
- \os' i O / -
N \ \I /e-'$ I
// //
kN,M
'/, r,i . , l/
\\
i h\'\\[
y, E- .s
-- ~
kkNN\ \ N' \' N m NY y oc w
N <
k*h ,
' 7 v ,/
o //,-/
s s 2' s l' 4 i
3
\y .
N s
n c
.%<s,m ,
e l
\ , e%-
l.
cz,
%) ,
s ,
w .; -, w s
. E' y *
=
~ n %
N\ $2 $i D Ck l
l - A,x\ '
-/
N. dT'.
'. b E
l .y t
1 . ! __._ . .._ -. m? '
l ,j-// 4 .-
~
'. h l % i
'la -~
l i..i s
, ~
Q/
I\'
l f.
or / \
'O j -
ty kT s, -
g
, - -vl N.i u- .-
Gs s
[b' 9 7 ~ .grf ' N'/N &,}: q3} '. ' ,W
$~~ t u w ,s so
CASE NUMBER: 1 DUILDING: UNIT 1 REACTOR BUILDING ELEVATION AND AREA DESCRIPTION: 283' GENER AL FLOOR AREA CASE DESCRIPTION: LOCALIZED HEATING OF MEMBER TYPE ISWF45 EFFECTS'0F LOCAL HEATING 04 STRUCTURAL STEEL FIRE TEMPER ATURE (dtsg . F): 1500 WEIGHT OF STEEL MEtiBER (lbs./ft): 45 SURFACE OF STEEL MEMBER HEATED (sq.ft./ft): 4.41 TIME STEEL TEMPERATURE (Min) (deg.F) 5.00 622 10.00 962 15.00 1170 20.00 1298 25.00 1376 30.00 1424 35.00 1453 40.00 1471 O
e ATTACHMENT D
7- . - - ~
...s; -
CASE NUMBER: 2 BUILDING: = UNIT'l-REACTOR BUILDING
. ELEVATION- AND AREA ' DESCRIPTION: 283' GENERAL FLOOR AREA CASE. DESCRIPTION: LOCALIZED HEATING OF MEMBER TYPE-36WF230 EFFECTS' 0F LOCAL HEATING ON STRUCTURAL STEEL .
FIRE TEMPERATURE- (deg. F): 1500 WEIGHT ~OF STEEL' MEMBER (lbs./ft): 230 SURFACE OF STEEL MEMBER HEATED (sq . f t ./f t): 9.04
. TIME STEEL 1EtiPERATURE
- (Min) (deg.F) 5.00 310 10.00 511 15.00 678 '
20.00 817 25.00 932
- 30.00 1028 35.00 1100 40.00 1174 i
l l^
O I #
ATTACHMENT D
~
.; . _ . * *: [ ~
. .