ML20129E820

Rev 2 to Evaluation of Spent Fuel Pool for Westinghouse High Density Racks

ML20129E820
Person / Time
Site:	San Onofre
Issue date:	05/02/1994
From:	Blaschke R, Reed K, Schafer D SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20129E795	List: ML20129E789 ML20129E820 ML20129E830
References
C-259-1.01.11, C-259-1.01.11-R02, C-259-1.01.11-R2, OIR-92-086, OIR-92-86, NUDOCS 9610280173
Download: ML20129E820 (18)

Text

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! W. NOTICE (CCN) Evaluation of Spent Fuel Pool for Westinghouse High Density i - e: ,j.

J Racks .o j  ;

OCLASS ENGNEERNO SYSTEM NUMBERmMARY STATON SYSTEM ~ 4, ,

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d,. .gThis.CCN;re-examinesthespentfuel'poolgatedrofo,e 1

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!' 2 i; ' density spent fuel racks. Sheets 6A, and 292B to 292N are.added.n Sheets 6 5 and 292A are also revised. This calculation change minimizes conservatisms n" used in the previous Westinghouse analysis. Buoyancy, rack and gate The .

W - geometry are used to determine the depth of penetration in the rack. <

O effects of rigging and the load blocks of the cranes are also considered. 3 M "~' .

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4 The results of this CCN show that only one fuel ass'e'mbly * # 9ptfESSlog

• l would be damaged in the event of a gate drop. fuel, 9 sc

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{f' assemblies must not be stored on reconstitution spacers to ensure damage is limited to 1 assembly.

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Sheet No. 4A Subject _ Evaluetten of Soent Fuel Pool for West. Eh Density Racks lat Daft sty omsmAfon sait tat cAftlarv omcRATOR DATE f

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SHEET 7 FOLLOWS l REFERENCES (Continued)

18. 5023-207-7-93, Rev 3; " Design Report for Two Region Spent Fuel Storage Racks, Volume 1 of 3' dated September 30, 1991.

5023-207-1-76, Rev 3; " Spent Fuel Pool Liner Bulkhead Gate, Sh. l' j 19.

5023-207-7-44, Rev 3; " Spent Fuel Storage Rack Assemt,1c (R2)" -j 20.

21. AWS D1.1-1988: " Structural Welding Code'

22. " Formulas for Stress and Strain," Roark and Young, 5th Edition

23. 5023-1-6.157, Rev. O, TCH 0-11; " Spent Fuel Pool Gate Removal /

Installation Procedure *

24. " Wright Electric Wire Rope Hoists"; Catalog; Babcock Industries, Inc.

"Spect fuel Pool Reracking Licensing Report". Revision 6 25.

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! CALCULATION SHEE CCN CDsMLA90N ttuNo.CCN-Project or DCP/MMP _ SONGS 2 & 3 Calc No. C-259-1.01.13 Subject Evaluation of Soent Fuel Pool for West. Hirh Density Ras.ks Sheet No. ZN 3

) l REV ORICmATOR OATE tRE DATE 086CMATOR DATE IRE DATE RIV ~

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SPENT FUEL POOL GATE DROP ON WESTINGHOUSE HIGH DENSITY RACKS j

i The following pages (Sheets 292B through 292N) evaluate the drop of the spent fuel pool gate on a Westinghouse high density spent fuel rack. This I

i calculation minimizes conservatisms used in the Westinghouse analysis and takes into account the gate and rack geometry as well as buoyancy to 2

determine the depth of rack penetration. This analysis also considers the i

effects of rigging and the load blocks in accordance with NUREG-0612 guidelines.

l l The drop of the gate was previously evaluated in Section 3.2.4.4 of j Reference 18. This analysis supersedes the Westinghouse evaluation. There i

are two types of racks, Region I and 11. The gate drop on a Region II rack j will govern since there is a single cell wall between each assembly rather than 2 cell walls in a Region I.

The Westinghouse analysis considered the shape of the gate to be a 3/4" i

]

thick plate, 41 inches wide. The actual gate has a 3/4 by 4 inch stiffener 1 J

plate perpendicular to the 3/4 inch plate at 5 inches from the bottom of

! the gate extending up the sides at 3% inches from each edge. The stiffener

plate will also transfer energy into the '

rack and reduce the penetration depth. , 3' 5* ,

5 l l (Ref.19) ,

%"  %" Spent Fuel N

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Project or DCP/MMP _ SONGS 2 & 3 Calc No. C-259-1.01.11 l

i Subject Evaluation of Set Fuel Pool for West. Hieh Density Racks Sheet No. 292 C-j DATI 1RI CATE f aty OmCmAtos DAff IRE DAff l b!V CmCRATOR l M15. m. scurra 4/22/94 e. c. $c5rt 4M i i l i

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The gate drop height is limited to 30" per Technical Specification 3/4-9.7.

1 ,

This height is necessary to clear the bottom of the gate through the 1

opening into the cask pool and maintain a 10" maximum clearance with a 1/2 inch margin.

1 l'

This analysis conservatively considers that the spent fuel pool water elevation is at its lowest allowed height. As the gate strikes the rack,

'i the rack deforms. The max height of any fuel is 13.2 inches below the top l i

of the rack (Ref. 18). The depth of penetration into the rack will l

j determine if any fuel assemblies could be potentially damaged. For l

purposes of this calculation, any contact of the gate with a fuel assembly will result in that assembly being considered as damaged. ,

The rack will absorb all impact energy by deforming the rack. The elastic li strain energy is negligible compared to the plastic strain energy. Since the bulk of the gate is a 3/4 inch thick plate, as compared to the cell i wall thickness of 0.11", there will be minimal energy absorption by the

gate.

4

}

I GATE HANDLING HETHODS (Ref.23) e There is a gate at each end of the pool to consider. The transfer pool gate is handled by the new fuel crane without any special provisions. The i cask pool gate is handled using the cask crane and requires special

} rigging. The cask crane will not travel far enough to allow centering of 1

either hook over the gate. An offset pull is required using slings and

come-alongs attached to the Spent Fuel Handling Machine (SFHM) rails or the  ;

SFHM bridge. l The come-alongs are supported by either the SFHM or rails with long slings to the gate. The come-alongs do not support any vertical weight of the gate. The come-along weight would not be seen by the gate during an impact due to the sling lengths being much longer than the drop height and each '

weighing less than 50 pounds l

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Project or DCP/MMP SONGS 2 & 3 i

Sheet No. 392. D i 1 Subject Evaluation of Soent Fuel Pool far West. Hirh Density Racks DATE 1Rt DAff h!V CRIGIEATOR CAft tal DAff AEV OMGINATG4 j l M u. seuren 4nv9t n.c.Eas' cut 4f4d f' l l i

i GATE RIGGING OFF-SET PULL 2 AND REMOVALSEQUENCE ,

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- CASK POOL 1

I The cask crane load block for the main and auxiliary hoists cannot travel over the spent fuel pool. If the supporting wire rope broke, the hook and lower block would fall straight down into the cask pool. As the hook falls, the rigging goes slack and the hook will continue to fall straight I. down into the cask pool never reaching the spent fuel pool.

The main book and load block dimensions are physically larger in all dimensions to the canal opening width. As such, the cask crane main hook

,2 and load block need not be included in the drop weight. However, the g' auxiliary hoist load block should be included because it could fit through u the canal opening and be pulled toward the pool. The aux. hoist is a 10

' ton electric wire rope type by Wright Hoists. The hook and load block x weight is approximately 265 pounds per manufacturer's catalog data (Ref.

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Project or DCP/MMP SONGS 2 & 3 Calc No. C-259-1.01.1I l

Sheet No. 2 9 2 (

Subject Evaluation of Spent Fuel Pool for West. Hieh Density Racks patE 1 erv cetetuAttst . eATE tRE DATE set f Ierv mictaAten ears NF. n. senarra 4 nom e.c.stAsk MM '

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If the gate were to drop while halfway between the pools, it will land on

= the floor of the opening which is above the rack. This scenario is bounded i

by the gate drop analysis for the pool liner plate. l The 5 ton new fuel handling crane can pass directly over the spent fuel '.

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pool to remove the transfer pool gate. For this case, the rigging and load block shall be included as part of the dropped weight. i l

I The cask crane auxiliary hoist load block governs by inspection since the l p )

l hoist has twice the capacity of the new fuel crane. Therefore, conrider l the drop of the gate on a Region !! rack with the rigging and load block f, weight for the cask crane auxiliary hoist.

l f' f

, CASE 1: Straight Drop i

urg f The worst case drop configuration results in the gate striking the

~

a j middle of 4 cell walls. All j

other potential drop scenarios strike more cell wall length such 5'  ;

that there is a greater resisting \  ;

j force.

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,' 8.85'CTC SPACING GATE

' ' Typ. Fuel Assemblies 1

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After the gate penetrates 5 inches, the

[ side stiffener plate will strike the l

f g ] ] rack. Since the gate bottom is only 3/4" thick, the initial failure mode

g. 41.o- expected is a local " knife edge" cut into the cell wall as shown.

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Project or DCP/MMP SONGS 2 & 3 Calc No. C 259-1.01.11 888 "0. CCN - d Subject Evaluation of Soent Fuel Pool for Wcst. Hieh Demity Racks Sheet No. 297_ F f cair ist cara omcmaton oatt int cart l arv encmatos l l arv l l b. m. scuren 4mm e. Cdascur 4SI l l t f I 1

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! 6 DETERMINE DROP WEIGHT

< t The drop weight of the gate shall CRANE HOOK include the rigging and load block as l

required by NUREG-0612. Use the cask  ; 3ng gg).

l crane aunliary hoist hook weight.

j Rigging weights are based on published /: ioK NK) LOAD MCMOR

' manufacturer data for typical j components for the configuration shown in the gate removal procedure: _ toK(uR)CHAmrAu. ,

I 1oK NR) SHACKLE j (Ref.23) 4

' Weights w toKN R)SUNGS l (3 FT. MR) j i 10T Hook & Block = 265 lbs V V

! Load Cell = 50 lbs.

l 3 Slings = 30 lbs.

Chainfall = 100 lbs. GATE l 20 lbs.

j 3 Shackles = ........

j Total = 465 lbs.

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_ _ . SheetNo ./) d___ ___ .

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!!v'.=.st.snee unie. s.c$sse.ue Gate Weight:

The gate is made from stainless steel plates with a rubber scol. The m,yor components are summarized below:

I ITEM SIZE QiY UNIT WI lbs.

SS Plate 3/4 x 28'-1" x 3'-5" 1 32.123 psf 3082 SS Plate 3/4 x 4" x 22'-0" 2 10.21 p/f 449 SS Plate 3/4 x 4" x 2'-8.5" 8 10.21 p/f 221 SS Plate 7/8 x 8 x 3'-5" 1 23.82 p/f 81 SS Clip Plates 3/16 x 2" x 2" 254 0.2127 8 54 Rubber Seals 3/16" x 3" x 58'-6" 2 1.25 p/f 146

, Misc. Items Bolts / Guide Rollers Lot 150 Riggin9 Lot 465 l

TOTAL 4648 Total Gate Wt = 4.65 Kips Buoyant Gate Weight:

Consider the minimum allowable low water elevation for maximum impact weight.

Low water elevation H, = 57'-6" Bottom elevation of gate before drop H3= 36'-4" Top of gate is: Gate Length - ( Water Elev. - Drop F, lev.)

[28'-7%") - ([57'-6"] - [36'-4"] ) = 7'-5%"

out of the water l Gate is approximately 75*5 submerged before the postulated drop.

NOTE: Gate will not be totally submerged at the time of impact.

i

, t!8&L DEPARTCINT y., y y ,

-oe CALCULATION SHEET - " - si ccscceteva Project of DCP/MMP M)NGS 2 & 3 Calc No. C.M110L1L__

ccesio CCN Sub}ect ISah.ation o[Sptn@l for We,t. lifrh Demit, Ratb_ _ ___ Sheet No 2_/2 M air ensamATOR SAff CAft AfV ca:cysAlea caft iat CAft Itt l

W

$o. m. se w te Arnist e. c. Went

_ _ _a _

l for the drop, take 3/4 of the gate as submerged. The gate will become lighter from buoyant forces as it drops. For conservatism, gate weight will be taken as a constant weight and the rubber seal water displacement will be neglected.

Max. Normal Pool Operating Temperature = 140-F (Ref. 25)

Use density, p = 61.4 pcf Buoyant weight 3(P ) - Wt of object (P) - Wt displaced water (P,)

P, e .75 x 61.4 pcf x x 28.625 ft

( 144 in'/ft'

+

x ( 2 x 27.5 ft + 8 x 2.71 ft )

144in'/ft' P, =355 lbs.

P, = 4650 - 355 - 4295 lbs.

OETERMINE DEPTH OF PENETRATION:

From Reference 18, the depth of penetration, d, is obtained by j conservatively assuming that perfect plastic deformation is initiated when the shear stress in the cell wall reaches 57% of the compressive yield strength. The stainless steel material yield stress is also given as 27,500 psi which includes temperature variation effects. This analysis I assumes shear behavior dominates. Since the cells are stainless steel l

plate material, formed into square welded boxes, which are in turn, welded to each adjacent cell, there is very little chance that the cell walls would buckle under load. Therefore, a shear behavior analysis is adequate.

1 For a uniformly distributed load, P, across the edge of a plate, the maximum shear stress is:

f, = 0.318 P / (t

• w) [Ref. 22. Table 33, Case 7)

Where: f = 0.57 F P'= Total [oad on cell wall edge t = Cell wall thickness = 0.110 in, w = Width of dist. load = 0.75 in.

sCE 26428 NEW 490

BES&L DEPARTCitT gc, ,n ,

CALCULATION SHEET ==~~~o x> ,

em em m sca towsrs P , t or DCP/MMP _ SONGS 2 & 3 Calc No. Q:59.I

. .01.1 i CC"40 CCN- k Subject E*aluntlan of hent Fuel Pool for Wat. Illah Demity Raeb Sheet No. g /Z [

att ossmates catt ist patt arv oscinatos cate_ _

iat _

cart l

'al'.e.m.seuese unfos s. e etasens d4M s

The load, P per inch depth, to cause plastic flow for 3/4" Plate:

p , 0.57 f, t " , 0.57 x 27,500 ps f x 0.110 in x 0.75 In 2

0.318 0.318 P, = 4067 lbs.

The 3/4 inch plate has already penetrated the rack and continues to penetrate 5 inches below the 4" reinforcing plate. When the 4" wide reinforcing plate hits the top of the cell, the wall will already be damaged from the initial impact from the vertical plate. The damaged area will make approximately a 20 to 30 degree angle with the bottom of the vertical plate as it penetrates the wall. As such, only a fraction of the wall remains available for further energy absorption. Take an angle of 30' from the bottom of the vertical angle.

4* ' - - - -

GATE 2.88* I i

3 f- - ' , ' ' ~ , RACK

• , .12* \ f^ CELL WALL i

y

• 30{al .- :'

i ;f Use Plate Width = 1*

I Nh

> I The load, P, per inch depth, for 3/4 inch plate plus 1" of reinforcing plate: where w = 1.75 in.

1 0.57 f,t w , 0.57 x 27,500 psi x 0.110 in x 1.75 in p' ,

O.318 0.318 P, - 9489 lbs.

sCE 2s426 Ntti s.90

NEs&L DEPARit:EgT

, g., 3n ,

CALCULATION SHEET mua ~~ a si -a/N e ccw convinow l Project or DCP/MMP SONGS 2 & 3 Calc No C.2591.0Lig cceno CCN Subject Evaluation of Noent Fuel Pool for West. Ilich Density Racks Sheet No. ,391 ")

l arv emensaten east ist cart l arv caacinates case card iae M. m. semann oma e. cQasene AlxM l J  !

i l

l The 3/4" plate alone will hit for the first 5 inches of penetration. Then the f reinforcing plate hits to a depth of (d - 5) inches. The impact energy must equal the resisting energy. The depth of penetration is also included as part of the impact energy to account for the additional energy to its final resting depth. This is conservative since the velocity is decrear.ing once the gate hits the rack.

Impact Energy = Energy absorbed P, x ht(in) =

4 walls x[P (5 in) 3

+ P, (dd)in ]

4295 lbs x ( 30 + d ) in > 4 x 4067 lbs x 5 in + 9489 lbs x ( d - 5 ) in d = 7.0 in. < 13.2 In.

OK in this case, the gate could we.

potentially damage 5 rack - 7 *9" cells. None of the fuel /

assemblies would be directly o, or hit by the gate. Penetranon 132' FUEL ASSEMBLY l

Consider a rigging failure that would result in an angled impact:

l The worst case energy impact occurs as the center of gravity is directly over the gate bottom corner. If the gate impacted at a 45 degree angle only a portion of the dropped weight would strike at the bottom corner.

A 45 degree impact is not likely to occur. The very top of the gate would have to travel nearly 9 times further than the drop height. The postulated rigging failure is the breakage of a sling.

f

, . t!8&L DLP ARTMikT g.g 3,y CALCULATION SHEET - ~ ~ Ni ~,a. mo. is (ce to=vissa Project or DCP/MMP SONGS 2 & 3 Calc No. ,[.jffjn11 ccaed CCN k j Subject Evaluation c{jpent Fuel l'ont for Wnt. Ifigh DerlSD ltaLb SheetNo y f{ X_

arv enecisatos f cAtt int cAfg att valCIN A f D a CAff IA! CAff l b. a. senm e unm e. c. 'Nc re 1/h l

] . _ . _ _ _ _ _ _._. . _

l Two lifting points are used on top of the gate per procedures. If a lower sling breaks, the center of gravity would be directly below the remaining lift point. If the gate dropped after the second lift point failed, the gate would land at a slight angle on the rack. Since the center of gravity is over the corner the gate could inen fall on its (dge toward the center of the pool af ter the initial impact. Because the center of gravity is so high, the effects of this secondary collision must also be evaluated. Case 2 evaluates the angled corner drop and Case 3 evaluates the secondary impact.

CASE 2: Angled Drop MAXIMUM IMPACT ANGLE:

e = arctan (41"/343.5")

= 6.8 degrees Say 7 degrees The net absorbed energy remains a linear function of the depth. And tne depth of penetration at the gate physical center will remain approximately the samc. That is the depth of penetration increases to:

d'= 7.0 + 41/2 (tan 70 ) = 9.5 inches < 13 2 inches OK There is additional conservatism from a rigging failure that occurs with the gate already at 30" above the rack. Neglecting any additional elongation in the rigging, the drop height decreases to:

ht = 30 - (41" x sin 7*) / 2 = 27.5 inches HENCE, N0 FUEL 15 IHpACTED BY THE GATE.

, NIS&L DEPARTMENT y.g so ,

CALCULATION SHEET =>=~~~o si .m e a

CC4 (04 v185104 Project et DCP/MMP SONG 9 2 & 3 Calc No. C 259 l.01.!! ctw60 CCN k Subject Evaluatioruf Focnt FucLl' col for %tJiit hI) emit

• RacLE_____.._.__ Sheet No . i 2 L.

j att calcinatos CAff sai caft any caicitarca cast ont cast l dA. . se.m. omu . . c'.% s c.n 1/4, l

Case 3: Secondary impact

)

As the gate strikes the rack with the center of gravity over a bottom corner, there is a 50/50 chance of it falling over on its side toward i

the center of the spent fuel pool. Ilie new drop height becomes the j difference between the center of gravity from a standing position to that o') its side.

Diop height = 343.5/2 - 41/2 =

151.25 inches I

The gate will impact: 343.5 / 8.85 = 38 cell walls The Resistive forces remain approximately the same as in Case 1, except that the reinforcing plate strikes at 3.5 inches (free edge on side)

J instead of 5 inches (Ref. 19).

l 4295 lbs x ( 151.25 + d ) in

- 38 x 4067 lbs x 3.5 in + 9489 lbs x ( d - 3.5 ) in

\ d - 3.8 in. < 13.2 in.

1 OK In this case up to 76 cells could be damaged. Again, no fuel assemblies would be impacted.

{ As the gate rotates, it will penetrate deeper into the first cell. For l ccnservatism, let the gate rest flat at a depth of.94. inches from the

) angled drop in Case 2. As it rotates to 45 degrees, the corner will go deeper into the cell by 1/2 the cell width.

d = 9.5 + 8.85/2 = 13.9 inches > 13.2 inches Hence, I fuel assembly may be directly impacted during the secondary impact. The cell walls will cause the corner of the gate to remain cente ed within the cell. It is therefore, not credible for this impact to occur between any cells such that a second fuel assembly could be damaged.

sCE 2S42f NCN 493 m _ . . _ . . ._

k!$&L DEPARTMENT g.,.,y g ,

CALCULATION SHEET 2" 'u a= si ~m % i s CCN CONVI ASiON Project er DCP/MMP MON (iEM,, Calc No. _C.JJ9.l.01.!! _ . , _ _

CC* n CCN -

Subject Evaluation of %nt Fuel Pool for West. Ilich Demity Hacks Sheet No.

_ {f 2 /4 aty omictuatca CATC Af DAff) SIV O A!Gl4 Af 0 R CATE lkt CAff

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CHECK GATE ST!ffENEF. PLATE It was assumed that the gate remains rigid when the 3/4 x 4" stiffener plate impacts the rack. The stiffener plate should resist the force applied by the rack cell.

p , 0.57 f,I w , 0.57 x 27,500 psi x 0.110 in x 1.00 in 0.318 0.318 P, a 5422 lbs.

Check stiffener as a cantilever plate:

M = 5422 x 4" = 21.7 K-in Cell spacing = 8.85 in.

S = 8.85 x (.75)' / 6 = 0.83 in3 f, = M/S = 26.1 Ksi < . 7 5 F, = 27 Ksi OK Check Weld:

P = 5422 / 8.85" = 613 #/in.

Weld provided = 3/8" Fillet 2" Length every 6" both sides (Ref.19)

Weld capacity (Ref. 21, AWS 0412 E60XX)

P, = ( 2 x 2" / 6" ) x 4.77 k/in

= 3.18 K/in > 0.6 K/in OK Therefore, the stiffener plate is okay.

SCE Pfd26 NEW 490 '

NES&L DtPARTMENT g.g g ,

CALCULATION SHEET ~ " iu "~ ~a Ni

- /> is CCh C0'.V1 ASON Project or DCP/MMP Jf)NG4 2A3_ _ _ Calc No. .C.]ff LOLjJ,._ _

tch 40 CCN - k Subject F*aluation of SPIOL&rt Ihllor_ Wot,_jlich Demitt Ra(ky_ _ _ _

__ Sheet No _f 72 N_

agy enjoistica call in! DAff lOAff

[R(V O RJClh A TO R IRf CAff i Njo'm.sc.uea 4inic. e.c.[IcnE [d41'

.]__

Sheet 293 follows GATE DROP ON SPENT FUEL RACK CONCLUSIONS The gate can strike and damage a single fuel assembly during a drop scenario. The rotation of the gate af ter an initial impact will cause the gate to touch a fuel assembly. Since the cell walls will keep the gate corner centered within the cell there is no chance that another assembly could be affected. The cell walls above the assemblies may be damaged in as many as 76 cells. This will make removal of fuel assemblies in those cells very difficult. Adjacent cells may also experience some deformations t?sulting in assemblies being stuck within the racks. This is considered acceptable since the fuel assemblies will remain intact.

This calculation is based on all fuel assemblies being at or below 13.2 inches from the top of the rack. Fuel assemblies should not be stored on spacers while the gate is being removed or installed to ensure only one assembly could be damaged. (That is, no fuel on reconstitution spacers.)

There will not be gross deformations in the body of the rack that would alter the center to center spacing of the fuel assemblies. As such, fuel criticality for the spent fuel assemblies in the vicinity of the damaged rack cells would not be adversely affected.

i I

sCE P6425 fic// 4 90 t'.

C-259-1.01.11 CCN 4, Pages 1 and 8 through 18 I

1 I

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