ML20129E830

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Rev 2 to Evaluation of Spent Fuel Pool for W High Density Racks
ML20129E830
Person / Time
Site: San Onofre  Southern California Edison icon.png
Issue date: 02/06/1995
From: Castello T, Pellet S, Regalado J
SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20129E795 List:
References
C-259-1.01.11, C-259-1.01.11-0, C-259-1.01.11-R02, C-259-1.01.11-R2, N-4072-001, N-4072-1, NUDOCS 9610280176
Download: ML20129E830 (12)
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Text

- . _ _ _ _. - . __ __ .-

, Sfisthrn California CALC NO. ICCN NOJ N-3 PAGE TOTAL NO. OF Edison Company PRELIM. CCN NO.

INTERIM CALCULATION C-259-1.01.11 O BASE CALC. REV. UNIT CCN CONVERSION CHANGE NOTICE (ICCN)/ 2 CCN NO. CCN-CALCULATION CHANGE 2 &3 CALC.REV)g 2

NOTICE (CCN) CALWTION

SUBJECT:

1

,' Evaluation of Spent Fuel Pool for Westinghouse High Density  ;

Racks I

CALCULATION CROSS-INDEX ENGINEERING SYSTEM NUMBER / PRIMARY STATION SYSTEM O-CLASS

( 11C New/ Updated index Included DESIGNATOR 2202 / XE1 D Existing Index is Complete II CONTROLLED PROGRAM OR PROGRAM / DATABASE NAME(S) VERSION / RELEASE NO.(S)

DATABASE IN ACCORDANCE O ALSO, USTED BELOW WTTH NES&L 41-5-1

1. brier Des:RIPTION OF ICCN/CCN: .

O PROGRAM O DATABASE I

g74 During the refueling outage for cyc'e 8, the Control Element Assemblies (CEAs) will be removed from the

!_ reactor and replaced with new CEAs. The old CEAs will remain within the spent fuel pc.o1 for storage.

1 The top of the CEA will be closer to the top of the storage rack than the fuel. This CCN re-evaluates

' load drop accident scenarios (e.g., fuel assembly, test equipment and bulkhead gate) above the fuel storage racks while considering storage of CEAs. Additional limitations for CEA storage are imposed within this calculation. Recent changes in the radiological evaluations [35] also require modifications j to the reconstitution procedure limitations.

i This calculation shows that fuel damage consequences subsequent to all postulated accidents will remain within the boundaries discussed within the UFSAR, provided that the limitations setforth within this j calculation are implemented as procedural control .

} This CCN is being perfonned in parallel with

, CCN N-2, whica consid m the drop of a consolidated canister onto cells containing CEAs.

Sheets 6A, 8, 292G, 2921, and 292L are revised. T30fESSlo4'4

  • [,**f * ., 4

! Sheet 292M has been rent.mbered to 292Q. O '. 6 4

Sheet 292N has been revised and renumbered to 292R.

Sheet 325 is voided and replaced by a new Sheet 325. - MhV:.

Sheets 6B, 8A, 8B, 292M thru 292P, ** '

d and 325A through 32 K are added. ,#C038574 X M Wshd

. y 5 Note: This calculation does not contain any computations *.,No e 3h//f/ '/ )

performed directly as part of a word processor. /

All calculations are performed using a hand held calculator and are manually typed.

8 **..kh,g..**p k OF CAO i 1

i INinATING DOCUMENT (DCP/MMP, FCN, OTHER SCE Calculation N-4072-001 Rev. 4 1

2. OTHER AFFECTED DOCUMENTS (CHECK AS APPLICABLE FOR CCN ONLY);

a j O YES O NO OTHER AFFECTED DOCUMENTS EXIST AND ARE ICENTIFIED ON ATTACHED FORM 26-503,

3. APPROVAL:

DISCIPLINE / ESC: CIV!L 1

Scott H. Pellet 51656 ORIGINATOR (Print namelinttist) PAX

/% id5 5 GS (S' .rbr)e , OTHER (signatur s)

/

3061. Rfh AtA PO /JTR M3lt IR ; (Print name/intbal) PAX 6/

"NES&L DM (Signature)

//2.5[57.'5 Date

4. ASSIGNED SUPPLEMENT ALPHA DESIGNATOR:

CONVERSION TO CCN DATE [# h 8-(/ SCE COM-SONGS 9610280176 961023 PDR ADOCK 05000361 P PDR

~

CALCULATION SHEET r= ccu so- *r exasics is CCN CONVERSION

/ ,g

' Project or DCP/MMP SONGS 2 & 3 Calc No. C-259-1.01.11 CCN NO. CCN - s T l Subject Evaluation of Soent Fuel Pool for West. Wh Density Racks Sheet No. _29 2, C,-

REY ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE tRE DATE l b M. SCHAFER 4/22/94 R. C. ASCHKE 4 S R th f '/,3hs a 'khs

]

j Gate Weight:

' The gate is made from stainless steel plates with a rubber seal. The major components are summarized below:

2 ITEM SIZE QTY UNIT WT lbs. g SS Plate 3/4 x 28'-1" x 3'-5" 1 M psf N 2

SS Plate 3/4 x 4" x N 2 10.21 p/f N 1

SS Plate 3/4 x 4" x 2'-8.5" 8 10.21 p/f 221 '

l

, 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 # 54

] Rubber Seals 3/16" x 3" x 58'-6" 2 1.25 p/f 146 Misc. Items Bolts / Guide Rollers Lot 150 Riggingd 1 nl.dc Lot 465

)

4 TOTAL

  1. h Total Gate Wt = 4.6h Kips 5W 4 6 K '

l Buoyant Gate Weight:

l Consider the minimum allowable low water elevation for maximum impact  ;

weight.

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

[28 ' -7%"] -

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

a out of the water 2

Gate is approximately 75% submerged before the postulated drop.

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

4 .

l SCE 26-426 NEW 4,90

" " - ^ . ..

.NEStil. DLPAHiM2N1 ICCN NO./

CALCULATION SHEET r= cc""o N-3 mos % _

een ecaR.

eCN NO. CCN -

Project or DCP/MMP SONGS 2 & 3 Calc No. C-259-1.01.11 Subject _ Evaluation of Soent Fuel Pool for West. Wh Densite Racks Sheet No. Z92.T.

rey ORIGINATOR DATE 1RE DATE REV ORIGINATOR DATE IRE DATE h.M.SCHAFER 4/22/94 R. C ELASCHKE I

/\ 6. /ef6/ 4/6[$lg. JTA D i i 1

g The load, P 1 1, to cause plastic flow tor 3/4" Plate:

p, 0.57 F, t v , 0.57 x 27,500 psi x 0.110 in x 0.75 in i 1 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 1 i 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.

)

z ,,

4=

GATE

+-

j 2.88" es ae i RACK I

1.12' CELLWALL

! . 5"  :

30

37

! Use Plate Width = 1" l .

! b i

The load, P gr inch dep., for 3/4 inch plate plus 1" of reinforcing 2

. plate: where w = .3 in.

p= 0.57 F, t w u 0.57 x 27,500 psi x 0.110 in x 1.75 in 2

0.318 0.318 P, = 9489 lbs.

~

' ~ _ - - _ _ - - - - - -

, ~~ ~ NES&L DEPARiNiEN 1CCN Nod

N-3 io CALCULATION SHEET cca no-
  • rws ao, e e

I CCN CONVIRSION

  • Projech or DCP/MMP _ SONGS 2 & 3 i Calc No. C 259-1.01.11 CCN NO. CCN .

Subject Evaluation of Soent Fuel Pool for West. Hieh Density Racks

< Sheet No. _2 9 2 L.

REY ORIGINATOR DATE

] 1RE DATE RIV O RIGINATO R DATE IRE DATE M. SCKAFER 4/22/94 R. C ASCHKE k4Y b <; . VeQfgf kJy- m Vis{st k

l 3 Case 3: Secondary Impact i 1 As the gate strikes the rack with the center of over a bottom corner, there is a 50/50 chance of it falling o on ts side toward the center of the spent fuel pool. The new becom the i difference between the center of gravity fr ng p ion to j that on its side.

Drop height = 343.5/2 - 41/2 = 151.25 The gate will impact: 343.5 / 8.85 1 walls The Resistive forces remain approxim y the s as Case 1, exce that the reinforcing plate stri s at inch e edge on side) pt instead of 5 inches (Ref.

4295 lbs x ( 151.25 + d ) in 8x 4 b5 x 3.5 f 9489 3.5 ) in d - 3.8 in. < '

.3.

OK In this case 11s c am , no fuel assemblies would be impa As the gate rotat it w etrate deepe nto the first cell. For conservatism, let the gate re flat at a depth of 9.5 inches from the angled drop in case 2. As it otates 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,1 fuel assembly may be directly impacted during the secondary impact. The cell walls will cause the corner of the gate to remain centered 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 26-426 NEW 4/90

NES&L DEPARTMENT = a.;

.. CALCULATION SHEET == cc= " 3 raos 11 er

, . .. . CCN CONVERS!CN [

CCN NO. CCN -

Project or DCP/MMP SONGS 2 & 3 Cale No. C-259-1.01.11 Subject Evaluation of Soent Fuel Pool for West. High Density Racks Sheet No. 2 9 2 L.

O RIGIN ATO R DATE IRE DATE REV O RIGINATO R DATE IRE DATE REV ,

. M. SCHAFER I./22/94 R. C. ASCHKE kd l 6 $. /6Def "4h4 Jm '2/'ha l

Case 3: (SpenNuel P5ol1GatejSecondary Impact As the gate strikes the rack with the center of gravity over a bottom corner, i there is a 50/50 chance of it falling over on its side toward the center of the spent fue g Subsequent to the initial imp _act,_the aate could topple over onto the racks b '

r a secondary impact. As the gate rotates, it will penetrate deeper in o the first ceT1. or conservatism, let the gate rest flat at a depth of 9.5 l 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, Cone fuel assembly may beMed subsequent to the primary impact The b '

l cell wa7Fs will cause the corner of the gate to remain centered w1InirT" he cell. It is therefore, not credible for this impact to occ between_any , 1 1ls_such that_a second_ fuel _a_ssembly could be dama e It is conservatively assumed that the impacted fuel assembTy is damaged and releases all of its contained gases into the spent fuel pool.

There are many paths which the gate can topple through prior to the secondary impact. The secondary drop will conservatively be analyzed as a knife edge impact onto the top of the racks similar to the primary impact. A knife edge impact may be considered as worst case, since considering the gate to topple in its own plane and cut through the water to strike the top of the racks on edge will produce the least water friction and the greatest impact velocity. .

1 i

NES&L DEPARTMENT cc8 was CALCULATION SHEET "" " " '='*'

CCN CONVERSION I

, Project or DCP/MMP SONGS 2 & 3 Calc No C.259-1.ol.11 CCN NO. CCN - -

Subject Evaluation of Spent Fuel Pool for West. Hinh Density Racks Sheet No. 292 M I REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE i

5. H. PELLET 1/13/9s JTK 7h5 i

The sketch below provides the dimensions of concern to describe the secondary I I

gate drop.

Note: The gate position shown below is subsequent to initial impact and prior to toppling. The initial penetration into the rack is neglected here providing a greater center of gravity height.

,co o**

i E

=- e _-

- e te v. 57- 6 "

d

{ n

= a J6 h-T*

9

-i 00 i

N -

g

\ .

l

_Y ,

agg 1

(cesf)(3Ahh +-

33L /o" 2

(5w 7*X,4 0

. 6 A TE DR o? n4 TER P1EDIA TE POSir/ON

. To simplify the analysis of this accident, the following conservative assumptions will be used as a basis for the model shown in the sketch below.

The gate is in a horizontal position prior to its drop, and remains in this position throughout its entire drop duration.

The gate is initially located with the top just below the surface of the water. This position is conservat'ive, since it raises the gate's center

of gravity much higher than the initial position subsequent to the initial impact previously postulated.

The only drag to be considered will be for the front (leading) surface of the gate. The drag on the trailing lip (which would be nearly equal to the leading surface) and the skin friction will be neglected.

I SCE 26-426 NEW 4/90

NES&L DEPARTMENT .cc~ e

~ " ~ * * =0 CALCULATION SHEET CCN CONVERSION i

Project or DCP/MMP SONGS 2 & 3 Calc No. C-259-1.01.11 CCN NO. CCN - h Subject Evaluation of Spent Fuel Pool for West. Hieh Density Racks Sheet No. 29Z N REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE

5. H. PELLET 1/13/95 JTR YllNI 1

s i

The sketch below shows the initial and final position of the gate as modeled {

i and considering the assumptions stated above for the postulated secondary '

drop. This model will be conservative for the actual gate drop configuration.

The elevation of the top of the racks will be taken to be 33'-10". This elevation is lower than the actual elevation, which is conservative, since the j greater the drop distance is, the higher the kinetic energy will be.

j i

TDP of WA TGR I

__ [ -

,e '

E L E.v', 5 726" a

  • g C4 c3 r C

Q , '

i

_n_  : _

8f =

z%6 --

I b.m 8 i .

o i

N et.c v 53'- 10 "

l IT

)

Tbf o f AACKS L -

l GATE DROP mod &L The methodology outlined in BC-TOP-9A [10], and previously used on sheets 288 through 292A, will be used to determine the impact velocity and kinetic energy of the gate. The weight of the gate will be taken as 4,650 lbs, as determined

(

on sheet 292G, considering the rigging and load block.

The' coefficient of drag (Co) is 1.27, also given on sheet 288. This value is conservative due to the greater cross sectional area of the side of the gate compared to the bottom of the gate.

SCE 26-42S NEW 4/90

NES&L DEPARTMENT m eos t

",a e CALCULATION SHEET " " """"

  • CCN CONVERSION Project or DCP/MMP SONGS 2 & 3 CCN NO. CCN -

Calc No. C-259-1.01.11 Subject Evaluation of Spent Fuel Pool for West. Ilieh Density Racks Sheet No. 292 O l nEV ORIGINATOR DATE IRE DATE REY ORIGINATOR DATE IRE DATE s.w.PEttET@ 12/s/94 JTR %hd Since the gate is assumed to be completely submerged prior to dropping, the V term is equal to zero. The remaining terms necessary to determine the 3 velocity of impact with the racks are computed as follows:

4 H = 284" ; L = 41"

) A" = (27. 5) ft (4.75) inches = 10. 8 9 f t2 (12) inches /ft f a= 5 A" C# = (0.0624) Rips /ft3 (10. 89 ) f t2 (1.27) 2W 2 (4.6 5) kips. = 0.0928 /fc.

{ The terminal velocity is given by 3

r i

!' V'2 = E 11 j

a' b"'

, where 6, is given on page 288 as 0 49 k/ft . .

J y,2 ,

32.17 h _ 0.0.490624I 0.0928\ / = 302.5 f t.2/second2 The impact velocity when the gate strikes the top of the racks is then given by the formula

{

1 l V2 . y,2 (1 _ g -2. <u - u )

1 Plugging in values gives a velocity of

./ l -2(0.C928) (284 - du g

V = y (302.5) \1 - e 12 j

=

17. 2 f t. /second The kinetic energy of the gate which must be dissipated by the rack during penetration will be 1

K. E. = 1- MV , (46 50) Bs. (17 . 2 ) ; f t. /second j 2 27,499 fg_3gg,

. 2 (32 .17 ) f t. / second2

} = 256, B00 inch-lbs.

The gate overall height is approximately 343.5". Tnis dimension can be used to determine the number of storage rack cell walls which will be impacted by 1

the secondary drop of the gate. Region II racks will control, since there is only one cell wall between assemblies. The number of cell walls which will be j impacted is given by:

1 J

j SCE 26-426 NEW 4/90 1

NES&L DEPARTMENT me

" " " " " " " = #"

CALCULATION SHEET ,

CCN COFNERSION i

Project or DCP/MMP SONGS 2 & 3 Calc No. C-259-1.ol.11 CCN NO. CCN - h Subject Evaluation of Spent Fuel Pool for West. Ilieh Density Racks Sheet No. 292 P REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE

$. H. PELLET D 1/16/95 J. REGALADO J% 1/16/95 343.5 ,39 ggyy ygyyg 8.85 where 8.85" is the cell center to center spacing in a region 11 storage rack.

The depth of rack penetration will be determined using the methodology employed on sheet 292J as d, 56,800 inch-lbs.

=

(38) call walls (4,067) lbs/ cell wall 1.67 inches Since this calculated penetration value is conservative and is less than the 13.2" dimension from the top of the racks to the top of fuel, there will be no fuel impacted by the secondary drop. Therefore, storage of standard fuel is acceptable in the secondary impact of the gate drop.

See sheet 325P for a discussion of CEA storage provisions within the secondary impact zone of the gate.

SCE 26-426 NEW 4,90

NES&L DEPARTMENT ,

CALCULATION SHEET r==.cca no. a - 3, mcemw CCN CONVERSION

. 'e e a

Calc No. C-259-1.01.11 CCN No. CCN .

Projset oi DCP/MMP SONGS 2 & 3 Subjset Evaluation of Soent Fuel Pool for West. High Density Racks Sheet No. 292.Q lb REV ORIGINATOR DATE IRE , DATE REV ORIGINATOR DATE IRE DATE g M. SCHAFER 4/22/94 R. C. ASCHKE Ab '

)

b 5 feQQd '%hs- JTR "I'/fa l l

CHECK GATE STIFFENER 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, t w , 0.57 x 27,500 psi x 0.110 in x 1.00 in '

1 0.318 0.318 P = 5422 lbs.

3 l

Check stiffener as a cantilever plate: l

' I M = 5422 x 4" = 21.7 K-in l

Cell spacing = 8.85 in.

S = 8.85 x (.75)2 /6 = 0.83 in f 3= M/S = M.1 Ksi < .M Fy = 27 Ksi OK Check Weld:

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

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

Weld capacity (Ref. 21, AWS D412, 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 2G426 NEW 4/90

~

NES&L DEPARThlENT

- IccN NO.I rd.3 17 CALCULATION SHEET ""* cc" " - " "**'

  • 4 *

' CCN CONVERSION

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

i Subject Evaluation of Spent Fuel Pool for West. Wh Density Racks Sheet No. 7 7Z N j REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE g M. SCHAFER 4/2?/94 R. C. B CHKE l

b 'S. fd&J \)a}7;- m 'h,I s 1 Sheet 293 Follows 4

GATE DROP ON SPENT FUEL RACK CONCLUSIONS i

The gate can strike and damage a sing 1 uel sembl during a drop scenario. The rotation of the gate af an ial impact will cause the

gate to touch a fuel assembly. Sinc cel" lls will keep the gate  ;

i corner centered within the cell ther o iance that another assembly l could be affected. The cell wall bo h ssemblies may be damaged in

as many as 76 cells. This will rem of fuel as blies in those j cells very difficult. Adja t is y also experi e some deformations
resulting in assemblies bei u in the rack This is considered l acceptable since the fuel a 'e 11 remain i l This calculation is based on assemblies b ' r below 13.2 inches from the to of the rac uel assemblie t be stored on spacers while the bein oved or i ensure only one j assembly could be a ( at is, no f r onstitutionspacers.) ,

j There will not be o deformations in the ra that would alter the cen t ter spacing of th emblie As such, fuel

criticality the fuel assemblies i vicinit th damaged j rack cells ld ot b ersely a ScE 26-426 NEW 4/90

NES&L DEPARTMENT ,rr._,.,,,,

u: CALCULATION SHEET ac = cc""o N - 3 ucela g CCN CONVERSION CCN NO. CCN .

Project or DCP/MMP SONGS 2 & 3 Calc No. C-259-1.01.11 Subject Evaluation of Spent Fuel Pool for West. Hich Density Racks Sheet No. '2 % (2 I!

REV ORIGINATOR DATE IRE DATE REV O RIGIN ATOR DATE IRE DAT OI H. SCHAFER 4/22/94 R. C. B CHKE d h $.10)N $h4 .M $l%

i l

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 after an initial impact will cause the gate t touch a fuel _assemblMt is conservatively assumed UTEt- g 1mpacte ue assembly Ts damaged and releases all of its contained gases l into the spent fuel pool.

Since the cehwalls will keep the gate corner centered within the cell cou ing topp1Tiig to a-secomFTiirpac't)there a

t is no chance that another assembly o d. ine cell waiis above the assemblies may be damaged in lb j as many au 76 cells. This will make removal of fuel assemblies in those  ;

cells very difficult. Adjacent cells may also experience some deformations ' '

resulting in assemblies being stuck within the racks. This is considered l

/acceptabletsince the fuel assemblies will remain intact. ~

There will not be gross deformations in tiie body of the rack that would

~

lO l 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 i rack cells would not be adversely affected. l, For a discussion of the gate drop evaluation with consideration of CEAs b within the impact areas, see sheets 325JT through 325)(.

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