ML20150F236
| ML20150F236 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 07/06/1988 |
| From: | WISCONSIN ELECTRIC POWER CO. |
| To: | |
| Shared Package | |
| ML20150F235 | List: |
| References | |
| NUDOCS 8807180193 | |
| Download: ML20150F236 (4) | |
Text
_ - _ _ - _ _
15.5.4 FUEL STORAGE Applicability Applies to the capacity and storage arrays of new and spent fuel.
Objective To define those aspects of fuel storage relating to prevention of criticality in fuel storage areas.
Specification 1.
The new fuel storage and spent fuel pool structures are designed to withstand the anticipated earthquake loadings as Class I structures.
The spent fuel pool has a stainless steel liner to ensure against loss of water.
l 2.
The new and spent fuel storage racks are designed so that it is impossible to store assemblies in other than the prescribed storage locations.
The fuel is stored vertically in an array with sufficient center-to-center distance between assemblies to assure K,ff<0.95 with the storage pool filled with unborated water and with the fuel loading in the assemblies limited to 44.8 grams of U-235 per axial centimeter of standard fuel assemblies and 46.8 grams of U-235 per axial centimeter of 0FA fuel assemblies with or without axial blanket loadings.
An inspection area shall allow rotation of fuel assemblies for visual inspection, but shall i
not be used for storage.
3.
The spent fuel storage pool shall be filled with borated water at a concentration of at least 1800 ppm boron whenever there are spent fuel assemblies in the storage pool.
4.
Except for the two storage locations adjacent to the designated slot for the spent fuel storage rack neutron absorbing material surveillance specimen irradiation, spent fuel assembly storage locations immediately adjacent to the spent fuel po.-
p4rimeter or divider walls shall not be occupied by fuel assemblies v ich have been subcritical for less than one year.
j Unit 1 Amendment Unit 2 Amendment 15.5.4-1 1
8807180193 890706 PDR ADOCK 05000266 F'
FIGURE 2
~
Point Beach Spent Fuel Racks
- - ~ ~
Neutron Multiplication Factes.
,__r===
.r - -
l Fuel Assembly Initial Enrichment
., _ ~
7
____3 I
+--
.....r_.-
0.93 l
s'
/
i
_.i_
,f Y~2 -
s l
+ - ~ ~
.a 1
0.92!
/
- ~ *
's.
r_
.n R
N. ~ _
=
a Z
t. _.r--
s_
_p.._..__
.Ih =. _.
7',
w u
m u.
0.91 c
m--
---m'~-
+!--
0, gyr],g_,,,,
u.. _......
m 4...=.._.=.=_______._-_
up.=_;
. =. _; a -
, - - + - - - -
.5=;._,__..._,
t-
.=-
r-- -
2.;,
._4________.g C.
,- ?.::: 2 o, 9 0;--- = r _=___:_ _ =
-+.==.:.: _=_=j
.._.. _J _. _ _t. 7 s==a== =--- ---2EE 4:=2==2c-- - i -.E=E===t =_==u==t===+===-:= = =" =_ t 3
2-I---
- -t=== V
=
_. _. :y l_-
.__:=_.
._. J
- --t===
- =.:- =. t = --- - -
- ==t = - +-- r.- t= = t.==__.=._ _- :___..
c 7 ;_ -
.J.r.
o h m =_== =. _.... _ _ _ _. _. _.
__4 m_
y n.
D
- .=='
.:=p_ _ _ -
=._
---:=-
g 2: 0.89.
==
j [im _. Id* i i=
.:tI _ T --
=
'~~I N ' " ' -
-~
_m:.}- - M 21= 5'[:_:
e-------
.-j--
y r
c
--t= :---. _. _ a __. _.. t - /. _ i _- ___ v.
_ at== =-t=.: = ! =.t 2. t=== ! : = r -- I -
-- 4.=-- - r.
p=
/_.__t_....--;___._._-.__._._m g
t_ _ _
. --- - d-~-..e==:i -- - :- =+- -
-~
.-----t__.
a_.
. ______ y
__....q: --
m_.___,__._.__l 0.88
.__..= r- - ---q-
_1 _ -
. q -- -. Ent: y
_=.==L _
- JEE = t__.
= -+-------t =. =i= E } = = l=.=xr= := n==.::= = : =p.:1
=
.-_-.a --f.t r=
...u._-t e-r_==r : :-t=.t =h =r-+-- - __t==- t==': n === t._ __ r- ~ 2=t - --t = = u+
- =l=
=d__ __i [
_6
.-.___r
. _e._p.___--_
L.= _i.:iiii'. =I.f..:_EEi-
= = - + _ _ _ _ _ +
1
_ ______- _ - = - 1.___... c__._ m _ t= ___=.. r:--- -
. _E_E_ __=_E_ F.__=.
=i-0.87
- = ~ ~"'
E~
' ~~I
- ~~-
^!-
- ~
. U=T- :E.lETEENEL==U ;iL3 9 -==l+J' U=~
-- ~--
~ _ _
' ' = -=" " Is!.a===El==== F =2. iEl ~=- le !.=.
~-
E=#2f5 r. -
. :t= d ::i n :- - = i = 2 L~~=.i= E..-- ' _
-=.r== FEE $r
. : r--f..-ET_.= tr-"I 2E i=-:=r=:
2.===j._-_. _...._.-_.g-_
, g_., g_ _ gg. _ = : r- - -4_.
2 i g;,--_
_L. 0. 3 6 i f
"~"' ' E=F3 HE-
~"
~ ~ ~ ~
~ """""--
=""
'"" " f E =
._.l..
2 a.... > _ w.- - k=. _= !. :.
..=l in * --
=I=4.== l==-
... h. _:_ :t=_:.h_.r== ;: r:..=
-~
au n:
- - =
.- u:=
i_.
5.0 =_
... A.... l. 3. 5 a _ =........ t=.. :. =, =..,==. m.. 4. O _ r: :: m _..% _=-r=, _4. 5 L
i.
-- rt
. i. - -. _. ! _. :.. =- r-1-
- i
_ __42. -- f' : d.=.. -
.. -..._t._....-___.,_.
__L_-..'--
- --.-~'j
-====i
_.: =...:::
Initial Enrichment (w/o)
- -".E.'.~'~~~
l-
.kri-r.s:r _.
.i.t
-,---!E= r h===1r= '=2m r_E.EJ u _ __ _
1
- f. '
TABLE $
SUWARY OF PERTURBATIONS TO THE MULTIPLICATION FACTOR OF THE BASIC CELL Description ok effect k.
Basic cell at 68'F, 4.0 w/o U-235,
.8993 W 14x14 optimited fuel assembly Calculational Biases Increase in temperature from Note 1 68' to 200*F Variation of water density from Note 1 that at 68'F LEOPARD /PDQ Model Bias
+.0069 Mesh spacing effect
.0004 Axial and radial leakage Note 1 Basic cell including biases
.9058 Tolerances and Uncertainties Tolerance on SS box thickness
+.0001 Dimensional tolerances on SS bcx
+.0027 Dimensional tolerance on Boraflex
+.0020 thickness Fuel position uncertainty Note 1 Maximum fuel pellet density
+.0012 Calculational uncertainty (2o)
+.0022 Total Uncertainty (statistical)
+.0042 Maximum k. including Biases and
.9100 Uncertainties Note 1.
This reactivity perturbation is negative and ignored for conservatism.
i l
L
4 Table 1. Summary of Perturbations to the Multiplication Facto of the Basic Cell for the New Fuel Storage Rack with 5.5 w/o U 235 Fresh Fuel Description Ak k,
Basic Cell at 68'F,5.5 w/o U 235 0.9064 Calculational Blases LEOPARD /PDQ Model Blas
+ 0.0011 Most Reactive Pool Temperature in the Range of 68'F to 200'F
+ 0.0006 Most Reactive Water D'ensity
+ 0.0049 Axial and Radial Leakage Note 1 Basic Cellincluding Blases 0.9190 Tolerances and Uncertainties Fuel Position Uncertainty i o.0006 Maximum Feel Pellet Density 0.0009 Calculctional Uncertainty (95/95) i O.00:9 Total Uncertainty (Statistical) i 0.0031 Maximum k, including Blases and Uncertainties 0.9221 Note 1. This reactivity perturbation is negative and is ignored for conservatism, except un1er accident conditions.
I