ML20079G188

Structural Steel Analysis for Limerick Generating Station: Unit 1 Turbine Bldg,El 239-Ft,Feedwater Heater Room,Fire Area 88B

ML20079G188
Person / Time
Site:	Limerick
Issue date:	01/04/1984
From:	PROFESSIONAL LOSS CONTROL, INC.
To:
Shared Package
ML20079G166	List: ML20079G163 ML20079G181 ML20079G188 ML20079G196 ML20079G202 ML20079G216 ML20079G220 ML20079G223 ML20079G227 ML20079G233
References
NUDOCS 8401190457
Download: ML20079G188 (7)

Text

_ - _ _ _ _ _ _ _ _ _ _ _ _

.d

_ PL C 'w"' ""' "" c*"'"' '"'-

STRUCTURAL STEEL ANALYSIS for

' w LIMERICK GENERATING STATION Unit 1 Turbine Building El. 239' Feedwater Heater Room Room 441 Fir,e Area 88B January 4, 1984 6

P. O. Box 446 e Oak Ridge, Tennessee 37830 * (615) 482-3541 8401190457 840113 PDR ADOCK- 05000352

LIMERICK GENERATING STATION

1. AREA DESCRIPTION The area under consideration is the Feedwater Heater Room, Room 441, on the

^ 239' elevation of the Unit 1 Turbine Building (Fire Area 88B). The bounding walls of the area are of reinforced concrete and concrete masonry unit

construction with an average thickness of 2 ft. The total surface area for heat transfer is 5048 ft2 (see Attachment A for sketch and calculation of surface areas).

2. COMBUSTIBLE LOADING Combustible loading in the area consists of five vertical cable trays r located along the west wall of the room. The total surface crea of the l cable trays is 208 ft2 with an average combustible loading of 3 lbs/f t2 cf I cable -tray surface area. There are no combustible liquids in this area.

3. VENTILATION PARAMETERS ..

There are two doors which enter this area, both measuring 3' wide by 7' high. One door is located in the south wall, th? other in the north wall.

4. CASES EXAMINED With the light combustible-loading in the area, the assumption that all

~ cables are burning simultaneously would present the worst case. With all cable trays burning, a surface area of 208 ft2 would be involved. This cor rasponds to a heat output of approximately 3765 kW. With all cables assumed to burning simultaneously, the duration of the fire would be 3 lbs/ft2 4 .1 lbs < 30 minutes min /ft2

5. RESULTS With all cable trays in the area burning simultaneously and one door open,

-the resulting fire was fuel controlled. A gas temperature of 529*F would be achieved after 30 minutes which is below the critical temperature of the

~

structural steel members (see Attachment B).

1 i ,

The position of cable trays relative to structural members was examined throughout'the area ~to assess the potential for localized heating. Cable trays were located within 12 inches of member types W24X68 and G1(W24X293).

~

Attachment C contains the-results of the calculations performed to deter-

' mine the response of. the st'ructural steel members to localized heating.

These calculations ara conservative because they assume that the entire length of .the structural steel members is subjected to a temperature of

.1300*F when in actuality only-a small section of the steel would be sub.

jected to-localized heating. As can be seen from the results, none of the members exceeded the single point failure temperature. of 1300*F during the 30 minute exposure period (time required for tray to burn to completion).

2

c-se ,

's.

b Q

Lsl - Y Unit 1 Turbine Building El. 239' Feedwater Heater Room 441

.Sytrface Area Calculation

. Walls North wall . (60' x 16') 960 ft2 1 South wall (60' x 16') 960 ft2 East wall (34'.x-16') 544 ft2 West wall (34' x 16') 544 ft2 3008 ft' yCeiling'  :(34' x 60') 2040 ft2 Total Surface Area for Heat Transfer 5048 ft2 l-

)

E ATTACHMENT A F

L l

' CASE NuttDER:

1 BUILDING: UNIT 1 TURBINE liUILDING ELEVATION AND AREA DESCRIPTION: 239' FEEDWATER HEATER ROOM 441 CASE DESCRIPTION: ONE DOOR OPEN ALL CABLES DURNING X X QOO K E R M K X X X X X-K X K K K X X X h K X K X X X X X M X Y K X X t X X X X X X X X X X X X X X X KK X X X X K X X K X X A M X M M X CEILItJG/ WALL CEILING / IJALL Ao Ho Aw Q THICKNESS MATERI AL (ft) (ft2) (ft) (ft2) (kW)

O Q G OC K K X X X X X X X X X X X K K X X X X W K -X X X X X X X X X X X X X X X X X X X X- X X X X M X X X X X-X X K -X X y X X K K K X X X X X 2.0 CONCRETE 21.0 7.0 5048 3765 FIRE IS FUEL CONTROLLED FIRE DURATION CAS TEMPERATURE (rsin) ( d eo . F )

2 191 4 240 6 277 0 300 10 336 12 361 14 304 16 406 18 ,

426

, 20 445 22 463

! 24 431 26 497 28 513 30 529 l

l ATTACH!!ENT B

.. t

' CASE NUMBER: -1 BUILDING: UNIT:1 TURBINE BUILDING ELEVATION:AND AREA DESCRIPTION: 239' FEEDWATER HEATER ROOM 441 CASE DESCRIPTION: LOCALIZED HEATING OF MEMBER TYPE W24x60 EFFECTS OF LOCAL-HEATING ON'STROCTURAL STEEL FIRE TEMPERATURE (den. FT): .1300-WEIGHT 10F STEELu MEMBER (lbs ./f t ) : 68

SURFACE OF STEEL MEMBER HEATED (sq.ft./ft):

6.06-

- TIME- STEEL -TEMPER ATURE (min, (deg.F)

.5.00 502 10.00 733 15 00 V65 20'.00 1083 25.00 1159 30.00 1209 e

M

- ATTACliMENT C-

.e. ,

^

f- CASE-NUMBER: 2

,4

. BUILDING: UNIT -11 TURDINE.-BUILDING 3

ELEVATION AND= AREA DESCRIPTION: 239' FEEDWATER HEATER ROOM 441 CASE. DESCRIPTION: -LOCALIZED HEATING OF' MEMBER TYPE G1(W24x293)

EFFECTS'0F LOCAL' HEATING ON STRUCTURAL-STEEL-l'

~

~ FIRE TEMPERATURE (deg. F): 1300 WEIGHT OF' STEEL MEMBER ,(lbs. /f t ) :- 293

. SURFACE OF STEEL MEMBER. HEATED (sq'. f t . /f t ) : 7.37

i. I l, . TIME STEEL TEMPERATURE lL (min) -(deg.F)

! 5.00 190

[ 10.00 301 15.00 400

,. 20.00 409 l' 25.00 ~570 l 30.00- 642 1

1 -

L 1

f L

i ATTACHMENT C

_ _ _ _ _ _ _ _ . _ _ _ . _ _ _ - _ _ _ . _ _ _ _ _ _ . _ _ _ _ _ - _ _ - _ _ _ _ _ _ _ _ _ - _ _ _ . _