ML20126J825

Rev 0 to Structural Steel Analysis for Peach Bottom Generating Station:Calculation 24,Unit 2,3,Turbine Bldg El 116 Ft Common Equipment Area (Beneath Switchgear Rooms),Fire Area 78B

ML20126J825
Person / Time
Site:	Peach Bottom
Issue date:	05/20/1985
From:	Dewey J, Melly B PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20126J788	List: ML20126J783 ML20126J825 ML20126J840 ML20126J858 ML20126J886 ML20126J909 ML20126J926 ML20126J952 ML20126J976 ML20126J990
References
NUDOCS 8506100706
Download: ML20126J825 (12)

Text

.

_PL C "+a-a "" a""" '"'

(

1 4

4-

' STRUCTURAL STEEL ANALYSIS

for PEACH BOTTOM GENERATING STATION Calculation-No.24 Unit 2,3 Turbine Building El. 116" Common Equipment Area (Beneath Switchgear Roome)

Fire Area 78B 77 PDR Prepared by:

Date:_[_2d_((

7 Reviewed by:

h O

Revision: O 7922 West Chester Pike e Upper Darby, Pa. 19082 * (215) 853-1700

l l

[

PEACH BOTTOM GENERATING STATION 1.

ARgA_QgggRIPTIgN The area under conalderation la the Common Equipment Area on the 116' elevation of the Turbine Building (Fire Area 78B).

The bounding walls are constructed of reinforced concrete with an average: thickness of 3 ft.

The total surface area for. heat transfer is 9,552 ft2 (see Attachment A for a sketch of the area under consideration).

2.

"ggnBygIIBLg_LgAgINg This area contains cable trays.

The avarage loading in the-cable trays is 8.93'1bs/ft2 of cable tray surface area.

The total surface area of cable trays in this area is 1,964 ft2, There are no combustible liquida in this area.

Enclosed combustibles.auch as cabling in conduit have not been considered in this analysia.

3.

VENTILATIgN_ PARAMETER @

There are 3 doors which enter this area.

999E_Numbgg

______gigg________

Locgtign 73 6"-4 1/2 x 3'-O" West wall 134 6'-4 1/2 x 3'-O" West wall 149 6'-4 1/2 x 3'-O" West wall 1

There is an opening on the east side of this area which measures 117'-O" wide by 18'-O 1/2".

In addition, there is a 6'-O" wide i

Eby 18'-O 1/2" opening in the north and south wall.

l 4.

CAggg_EXAMNED

.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 ft.-per hour and instantaneously up any vertical trays encountered.

The fire will spread a distance of 15 feet in each direction along the cable trays before the original point

(-

source dies out after 89 minutes.

A maximum surface area of 184 ft2 of cable trays (see Attachment B for a list of trays)

.will be involved at any one time, which corresponds to a heat output'of 3,235 kW.

This heat output is assumed constent 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.

5.

RggULT@

The only case examined was that of a spreading cable fire occurring when one personnel door was open.

The fire duration was taken to be 180 minutes.

The maximum temperature reached was 717 OF, which is below the critical temperature for the 1

structural steel (see Attachment for results of analysis.)

Since L

the resulting fire was fuel controlled with one door open, it

~

will also be fuel controlled if any additional doors are open.

2

~ _

The positions of cable trays relative to structural steel members were examined throughout the area in order to anaeas the potential for localized heating.

Attachment D contains the results of calculations performed to determine the response of the affected structural members to localized heating.

These calculations are conservative because they assume that the entire length of the member la sub ected to the exposure temperature, J

whereas, in reality only a short section would be.

The duration of each cable tray fire is taken to be 90 minutes which is the time required for a, cable tray to burn to completion.

The cable tray exposures and beam responses are tabulated as follows:

Final Beam Caae Member Exposure

(

C 0

_Ngz_

_Irgg_

Iggez1 El Iggez_1 El 1

W16x36 15000F 1500 2

W12x27 15000F 1500 3

W1'2x27 13OOOF 1300 4

W16x36 13OOOF 1300 5

Same as Case 1 6

Same as Case 2 7

Same as Case 2 8

Same as Case 1 9

Same as Case 3 10 Same as Case 4 11 Same as Case 3 12 Same as Case 3

\\

3

1

.(

i 6.-

gggggIg_gg_IgaggIggI_ggggggIIgggg i

The worst case fire examined was fuel controlled with a duration of 180 minutes.

The maximum additional heat release rate due to transient materials in the area which will result in en area 0

temperature.less than 1100 F is listed below.

2 Eigg_Durgtign 946__1hWfm y ggggy 180 6.5 2,533 The distance between the floor and the deepeat beams supporting the ceiling in 16'-8 1/2".

The heat release rates required of floor level transient combustible fires to produce plume temperatures of 11000F, 13OOOF and 15000F at the bottom

-(

flange of the beam have been determined and tabulated below.

For 0

..the temperatures greater than 1100 F the time requirsd to heat the sizes;of the beams supporting the ceiling have also been determined.

Time =te_1199 F1migl II 1 IBW1 W12_E_2Z W19_E_2s W19_E_99 1100 7,257 1300 9,549 13 14 38 1500 12,042 9

10 26 4

c.

'k e

A C

)

l l

\\

\\

\\

A U

U' i

(

Unit 2,3 Turbin Building, Elevation 116'-0" Common Equipment Area

> Surface Area Calculation,

Walls 2

North wall (57' x 18')

l',026 ft South wall (57' x 18')

1,026 ft2 West wall (128' x 18')

2,304 ft i

2 4,356 ft 2

Ceiling (128' x 57') - (50' x 42')

5,196 ft 2

Total Surface Area for Heat Transfer 9,552 ft

'(-

ATTACHMENT A

SPREADING CABLE FIRE TRAYS

,y

(.

Tray Section

-Width Length

.. Surf. Area (Inches)

(Feet)

(Sq. Ft.)

2CH 010 12

?4 24 2RH 040 6

24 12 2CK 010 14 24 28 2CH 030 18 12 18 2CF 057 & 058~

30 6

15 2CJ 050~

13 24 26 2RF 050 18 24 36

'2CH 058 18 6

9 2CK-010

^

4 24 8

^

2CJ 050 4

24 8

o 184 sq. ft.

r -

k ATTACHMENT B

u..SE NO. :

1.

BUILDING: PEACH BOTTOM TURBINE BUILDING ELEVATION AND AREA DESCRIPTION: 116' COMMON EQ. AREA (BENEATH SWGR. RM)

CASE DESCRIPTION: SPREADING CABLE FIRE

++o++++++++++++++++++++++++++++++++++++++4:*+++++++++4:*++++++++++++++++++++++++++

i CEILING / WALL CEILING / WALL Ao Ho Aw Q

THICKNESS.

MATERIAL

(FT. )

SQ. FT.

FT.

SQ. FT.

KW

-++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

3. 0 CONCRETE 19.1

6. 4 9552 3235 FIRE IS FUEL CONTROLLED FIRE DURATION GAS TEMPERATURE (MIN.)

(DEG. F) 10 522 20 538 30 552 40 565 50 578 50 590

- (-

70

'601 80 613 90 624 100 535 110 545 120 G56 130 667 140 677 150 G87 150 E97 170 707 180 717

'(

ATTACHMENT C

l 9.

"f' 7E NO. :. :1 L_ALDING: PEACH BOTTOM TURBINL' C'JILDING

~ ELEVATION AND AREA DESCRIPTION: 11L' COMMON EQ. AREA (BENEATH SWGR. RM)

CASF DESCRIPTION:.W12X27 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE.(DEG. F):

1300

. EIGHT OF STEEL' MEMBER (LBS./FT.):

27 W

SURFACE OF. STEEL MEMBER HEATED (SQ. FT./FT):

4.12

. TIME STEEL TEMPERATURE (MIN.)

(DEG. F) 5 811 10 1106 15 1223 20 1269 25 1288 30 1295 35 1298 40

,1299 445

'1300-50 1300 55 1300

-(

60 1300 65 1300 70 1300 75 1300

~

80 1300 85 1300 90 1300 f

e ATTACHMENT D v

e i

CASE NO.:

2.

BUILDING: PEACH BOTTOM TURBINE BUILDING ELEVATION AND AREA DESCRIPTION: 116' COMMON EG. AREA CASE DESCRIPTION: W12X27 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE (DEG. F):

1500 WEIGHT OF STEEL MEMBER (LBS./FT.):

27 SURFACE OF STEEL MEMBER HEATED (SQ. FT./FT):

4.12 TIME STEEL TEMPERATURE (MIN.)

(DEG. F) 5 932 10 1275 15 1411 20 1465 25 1486 30 1494 35 1498 40 1499 I

45 1500 50 1500 55 1500 60 1500 65 1500 70 1500 75 1500 80 1500 85 1500 i

90 1500

(~

ATTACHf1ENT D L

J.

[

CASE NO.':

'3 BUILDING:- PEACH -BOTTOM TURBINE BUILDING ELEVATION AND AREA DESCRIPTION: 116' COMMON EQ. AREA CASE DESCRIPTION: W16X36 EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMP'ERATURE (DEG. F):

1300 WEIGHT OF STEEL MEMBER (LBS./FT.):

36 SURFACE OF STEEL MEMBER HEATED (SQ. FT./FT):

4.28 TIME STEEL TEMPERATURE (MIN.)

(DEG. F) 5 647 10 954 15 1117 20 1203 25 1248 30 1273 35 1286 40 1292

(.

45 1296 50 1298

.55 1299 60 1299 65 1300 70 1300 75 1300 80 1300 85 1300 90 1300

's ATTACHMENT D L_

r t

ll r-I

-CASE NO.:

4 BUILDING: PEACH: BOTTOM TURBINE BUILDING

ELEVATION AND AREA DESCRIPTION: 11G' COMMON EQ. AREA CASE DESCRIPTION: W16X3G EFFECTS OF LOCAL HEATING ON STRUCTURAL STEEL FIRE TEMPERATURE (DEG. F):

1500

' WEIGHT OF STEEL MEMBER (LBS./FT.):

3G SURFACE OF STEEL MEMBER HEATED (SQ. FT./FT):

4.28 TIME STEEL TEMPERATURE

-(MIN.)

(DEG. F) 5

-741 10 1098 15 1287 l

20 1387 25 1440 30-14G8 35 1483

-(-'

40 1491

- 45 1495 50 1497 55 1499 50 1499 65 1500 70 1500 75 1500 80 1500 85 1500 90 1500 1

ATTACHMENT D G