ML19350A857
| ML19350A857 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 03/10/1981 |
| From: | Mayer L NORTHERN STATES POWER CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8103170158 | |
| Download: ML19350A857 (20) | |
Text
b e
e NSF NORTHERN STATES POWER COMPANY u ssN aapou s. wis s e s va ss4os I
AN
$[7 REW[h
'4 // \\
March 10, 1981
'YE $1 g
Director of Nuclear Reactor Regulation U S Nuclear Regulatory Commission d
@on Washington, D C 20555
<,h
/
Prairie Island Nuclear Generating Plant 4
Docket No. 50-282 License No. DPR-42 50-306 DPR-60 Supplemental Information - License Amendment Request Dated January 31, 1980 Attached is the fourth set of responses to questions sent to L 0 Mayer from R A Clark on November 5, 1980, concerning the Prairie Island NGP Fuel Storage Facility modification. The first, second and third set of answers were sent on November 21, 1980, January 14,1981 and February 3, 1981 re spect ive ly.
Attached is the answer to Auxiliary Systems Branch (ASB) question 5 and a report titled " Prairie Island Spent Fuel Pool Modification -- Spent Fuel Pool Ccoling System Analysis" which will supplement the response to ASB-2 dated February 3,1981. This completes the answers to the November 3, 1980 questions.
l
@s l
L 0 Mayer, PE l
Manager of Nuclear Support Services LOM/TMP/bd cc: J G Keppler l
C Charnoff MPCA Atta: J W Ferman NkC Resident Inspector i
8108170 M P
Attachment to March 10, 1981 Letter AUXILIARY SYSTEMS BRANCH (ASB)
QUESTION ASB 5:
In regard to section 3.4.4.6 of Exhibit C, describe, discuss and verify that all the handling tools, that are to be handled above the stored spent fuel assemblies will not result in unacceptable consequences when dropped from their maximum operational elevations.
RESPONSE ASB 5:
Spent fuel pool operations have been reviewed and the following restrictions will be adhered to following the installation of the new fuel racks:
Items weighing less than 1625 lbs (the weight of a fuel assembly,1275 lbs, and its tool, 350 lbs) shall be restricted when they are suspended by the Spent Fuel Pool Bridge Crane over a pool containing fuel. The height of such items shall be restricted such that their potential energy will not be greater than 3250 ft-lbs. (relative to the top of spent fuel assemblies in the racks).
Identification marks will be located on the shafts of the tools to indicace how high the tools may be raised.
Items weighing less than 1625 lbs carried by the Auxiliary Building Crane will not be restricted due to the large capacity of the crane relative to 1625 lbs, hign factors of safety of slings used, and the low frequency of moving the tools with the Auxiliary Building Crane.
In the review of this question the spent fuel pool canal gates were also investigated. AFthough the gates are not considered handling tools, they do weigh more than a fuel assembly and its handling tool. The Technical Specifications as originally issued and currently worded, prohibit the movement of " heavy loads" in the spent fuel pool. Although not specifically defined, this was meant to restrict shipping casks and heavy equipment and not gates.
However, recently issued NRC documents have defined " heavy loads" to be loads greater than a fuel assembly and its haniling tool. Therefore, a review of gate handling procedures was conducted. To reduce the likelihood i
of one failure causing the dropping of a gate, it will be handled by'both hoists on the Spent Fuel Pool Bridge Crane when being moved in a spent fuel pool containing fuel. The weight of a gate is approximately 2600 pounds and each hoist has a 6000 pound capacity.
In conclusion, the proposed method of handling the gates makes the possibility of dropping-a gate extremely low. With these precautions, the gates will not be considered
" heavy loads" as referred to in Technical Specifications 3.8.B.1.
4
Acccchment to March 10,19811.etter PRAIRIE ISLAND SPENT FUEL POOL MODIFICATION SPENT FUEL POOL COOLING SYSTEM ANALYSIS The analysis of the spent fuel pool cooling system (SFPCS) and resulting pool water temperatures for various conditions is described in Exhibit C.
Section 3.5 of the License Amendment Request dated January 31, 1980. The purpose of this report is to update the results presented in Section 3.5 to account for two changes. First, the application of the uncertainty factor in the heat generation computation is changed to confonn exactly with the method of Branch Technical Position ASB 9-2.
Second, the abnormal condition of Section 3.5 was based on the assumptions that a flow rate of 2200 gpm would be distributed evenly between the two heat exchangers. Recent calculations have shown that the system is capable of handling 2600 gpm (the maximum pump output), and that the flow can be distributed unequally between the heat exchangers.
Therefore, in response to NRC coments and including the above changes, new results are presented in this report. The following conditions have been analyzed:
I.
Normal condition, main heat exchanger and one pump at 1300 gpm II. Normal condition, backup heat exchanger and two pumps at 2600 gpm total III. Abnonnal condition, both heat exchangers (main 1600 gpm and backup 1000 gpm IV. Faulted condition, main heat exchanger and one pump at 1300 gpm V.
Faulted ccndition, backup heat exchanger and two pumps at 2600 gpm total The methods used are_ the same as described in Section 3.5, except for the uncertainty factor change. The results of the analyses are shown in Figures 1 through 15 anc in Table 1..
The peak pool temperatures and applicable ' figures for each condition are given below.
Peak Pool Applicable Condition Temperature- (CF)
Figures I
133 1, 2 & 3 II 137 4, 5 & 6 III 145 7, 8 & 9 IV 175 10, 11 & 12 V
183 13, 14 & 15 Table 1 lists the peak heat generation, and heat exchanger inlet and outlet temper &tures and flow rates.
/
i O
9 1
8 5
R PRAIRIE ISLAND NORMAL DISCHARGE HEAT GENERATION g
MAIN HEAT EXCHANGER d
1300 GPM 3
n v
O e
~
cr.
=
r.
E o
~
m o
2 o
I w<
QC tuz tu
.O W
o o
tu f,
r n
4 8
d 8
i I
i I
l l
1 0.00 20.00 40.00 60 00 DAYS FROM SHUTDOWN FIGURE 1 O
e -
8 5
2 PRAIRIE ISLAND NORMAL DISCHARGE HEAT REMOVED g
MAIN HEAT EXCHANGER d
1300 GPM S_
n n-o E
o saE o
Ow
>ar W
x H
o o
W d
fd_
L
.8 d
5 1
1 1
I i
1 0.00 20.00 40.00 60.00 DAYS FROM SHUTDOWN FIGURE 2
8 5:-
PRAIRIE ISLAND NORMAL DISCHARGE POOL TEMPERATURE MAIN HEAT EXCHANGER O
9 1300 GPM N
^u y
r.
D H
cIW w
a o
O Q.
8 b
~
~.
8
- a S
L i
i i
i i
1 0 00 20 00 40.00 S0.00 DAYS FROM SHUTDOWN FIGURE 3
8 1
PRAIRIE ISLAND NORMAL DISCHARGE HEAT GENERATION g
BACKUP HEAT EXCHANGER d
2600 GPM S_
n T
C W
s
!E o
o 8L Cr t.LIz w
O H
o o
W d
I esu 8
- a IR 1
I I
I l-1
-0.00 20.00 40.00 60.00 DAYS FROM SHUT.DOWN FIGURE 4 9
8 5
8 PRAIRIE ISLAND NDRMAL DISCHARGE HEAT REMOVED BACKUP HEAT EXCHAMGER c
O d
2600 GPM 3
O T
C Y
f $
C sa8 m_
O t.u O
E l
w Cd H
O
<C-o W
5 I
c4
- j..
N-l l
W o
I b
l.
e i
I I
I I
I 0,00 20.00-40.00 60.00 l
DAYS FROM SHUTDOWN FIGURE 5
-w 4
8 4
PRAIRIE ISLAND NORMAL DISCHARGE POOL TEMPERATURE BACKUP HEAT EXCHANGER o
9 2600 GPM M
u r.
o "D.
o H
=
4 E
W H-J O
O Q
5 L'_
i I
c.'
8
'4 l
l l
1 I
I I
I 0.00 20.00 40.00 60.00 DAYS ~FROM SHUTDOWN FIGURE 6
(
a_--
4 0
8 b
PRAIRIE ISLAND FULL CORE DISCHARGE HEAT GENERATION MAIN HX - 1600 GPM C
BACKUP HX - 1000 GPM 8m m
D O
Y y""C E8 g
i N<
tr W
Zw C'
H O
O W
I a
m g 8
s i
I I
I I
I 0.00 20.00 40.00 60.00 D AYS FROM SHUTDOWN FIGURE 7
8 l
s PRAIRIE ISLAND FULL CORE DISCHARGE HEAT REMOVED MAIN HX - 1600 GPM 3
BACXUP HX - 1000 GPM 52_
too
=
8 m-Ow
>arw x
H o
a w
r R
8 I
i i
l l
1 0.00 20.00 40.00 60.00 DAYS FROM SHUT.DOWN FIGURE 8 ~
~
1.
e a
S_
PRAIRIE ISLAND FULL CORE DISCHARGE POOL TEMPERATURE MAIN HX - 1600 GPM C
9 BACKUP HX - 1000 GPM
~
w Of D
S 25 g-a.
EW O
Q.
8 a
e o
- 1 i
i l
I l
0.00 20.00 40.00 60.00 DAYS-FROM SHUTDOWN FIGURE 9
~
8 5
8_
PRAIRIE ISLAND FAULTED HEAT GENERATION MAIN HEAT EXCHANGER o
9 1300 GPM 8
m_
^
tn o
a e
g
.a.
5 8
5 Z
u o
r<a:wzw e
H o
a w
I e
l 8
I I
I I
I l
0.00 20.00 40.00
'60.00 DnYR FROM SHUTDOWN FIGURE 10
8 5
M-PRAIRIE ISLAND FAULTED HEAT REMOVED MAIN HEAT EXCHANGER o
?o 1300 GPM Pc n
mo E
o s
o g
5 Pc Ow
>arw c::
H o
a W
d I
ca Q
\\
.8 b
i l-1 I
I I
i 0.00 20.00 40.00 60.00 DAYS FROM SHUTDOWN 1
FIGURE 11
~ '
R 8
i l
PRAIRIE ISLAND FAULTED POOL TEMPERATURE MAIN HEAT EXCHANGER O
9 1300 GPM
?s xo 8
F-S x
W
/
Q..
E W
F--
J m
8 l
l r
i O
N l
- Om I
l l
l l
l 0.00 20.00 40.00 60.00 DAYS FROM SHUTDOWN FIGl]RE 12
8 5
E_
PRAIRIE ISLAND FAULTED HEAT GENERATION BACKUP HEAT EXCHANGER o
g 2600 GP.f1 m
es e
O e
es Rg e.
e 8
5 E.-
-s<
a::wzw O
H o
o l
w r
2
~
l
~..
8 b-.-
l 1
l 1
l l
l l
0 00 20.00 40.00 s0,00 DAYS FRot1 SHUTDOWN l
FIGURE 13-a --
8g L
PRAIRIE ISLAND FAULTED HEAT REMOVED BACKlJP HEAT EXCHANGER oo 2600 GP.51 o
E n
Lt>o e
k S
iE d
a_
Cw>
f C
l EW OC o
o w
d r
a
~
i.
. o 5
I i
i i
l I
0.00 20.00 40.00 60.00 DAYS FROM SHUTDOWN FIGURE 14 l
l
C 9
I PRAIRIE ISLAND FAULTED POOL TEMPERATURE BACKUP HEAT EXCHANGER C
9 2600 GPM E
C W
QC D
H
+
5
~s i
Q EW W
.J O
O Q
8 n
~' N s.
8
~
l l
I I
I I
I i
0.00 20.00 40.00 l
60.00 DAYS FROM SHUTDOWN FIGURE 15
4 l
i i
1 l
SFP CCll PEAK SPENT FUEL P0OL HATER C0lf0flENT COOLING HATER I
C0f1DIT10N E
EXCim GER u/
(LBS/liR)
INLET OUTLET (LBS/IIR)
INLET OUTLET i
j 1 pump 7
5 5
1.197 X 10 132.0
\\ 114.3 6.506X 10 95 107.8 9 X 10 f
?.
2 pumps l
NORMAL BACKUP 6
95 108.3 9 X 106 1.197 X 107 135.6 126.4 1.301 X 10
~
split flow 5
m.6 9XM ABNORMAL 2.509 8.008X10 X 107 2 Pumps -
split flow 5
i BACKUP 5
95 102 9 X 10 144.5 132.0 5.005X10 1 pump 2.509 X 107 171.2 134.4 6.506 X10 95 121.6 9 X 105 6
FAULTED MAlfi 2 pumps 6
5 FAULTED BACVUP 2.509 X 10 178.5 159.1 1,301X10 95 i
123.04 9 X 10 TABLE 1 SPEllT FUEL P0OL COOLING DATA
..