ML20115A300
| ML20115A300 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 10/06/1992 |
| From: | NORTH ATLANTIC ENERGY SERVICE CORP. (NAESCO) |
| To: | |
| Shared Package | |
| ML20115A298 | List: |
| References | |
| NUDOCS 9210140207 | |
| Download: ML20115A300 (8) | |
Text
_.
4 e
CORE OPERATING IIMITS REPORT SEABROOK STATION UNIT 1 CYCLE 3 s
C 9210140207 921006 PDh ADOCK 05000443 P
~
).O CORE OPERATING LIMITS REPORT This Core Operating Limits Report for Seabrook Station Unit 1, Cycle 3 has been prepared in accordance with the requirements of Techmeal Specillcation 6.8.1.6.
The Technical Specifications affected by this report are:
1) 3.1.1.1 Shutdown Margin Limit for MODES 1,2,3,4 2) 3.1.1.2 Shutdown Margin Limit for MODE 5 3) 3.1.1.3 Moderator Temperature CoefIlcient 4) 3.1.3.5 Shutdown Rod Insertion Limit 5) 3.1.3.6 Control Rod Insertion Limits 6) 3.2.1 Axial Flux Difference 7) 31.2 Heat Fhix Ilot Channel Factor 8) 3.2.3 Nuclear Enthalpy Rise Hot Channel Factor 2.0 OPERATING LIMITS The cycle-specille parameter limits for the specifications listed in section 1.0 are presented in the following subsections. These limits have been developed using the NRC-approved methodologies specifled in Technical Specification 6.8.1.6.
2.1 Shutdown Margin Limit For MODES 1,2,3, and 4: (Specification 3.1.1.1)
A) 'lhe Shutdmvn Margin shall be greater than or equal to 1.3 % AK/K (n MODES 1, 2, and 3.
D) The Shutdown Margin shall be greater than or equal to 1.8 % AK/K in MODE 4.
2.2 Shutdown Margin Limit For MGuE 5- (Spectfication 3.1.1.2)
The Shutdown Margin shall be greater than or equal to 1.8 % AK/K.
2.3 Ifod:rator Tcmptratura Coeffici:nt: (Specification 3.1.1.3) 2.3.1 The ModeratorTerrperature Coefficient (MTC) shall be less positive than 0 AK/K/'F for Beginning of Cycle Life (BOL), All Rods Out (ARO), Hot Zero Thermal Power conditions.
3.3.2 hfI'C shall be less negative than -4.2 x 10~' AK/K/*F for End of Cycle Life (EOL), ARC, Rated Thermal Power conditions.
2.3.3 The 300 ppm ARO, Rated Thermal Power hrfC shall be less negative than
-3.3 x 10~4 AK/K/'F (300 ppm Surveillance Limit)
^ 4 Shutdw.s Rod Insertion Limit: (Specincation 3.1.3.5) 2.4.1 The shutdoum ods shall be Iully withdrawn. The fully withdrawn position is denned as use interval within 225 steps withdrawn to the mechanical fully withdrawn position inclusive.
2.5 Control Rod Insertion Limits: (Specincation 3.1.3.6) 2.
The control rcyl banks shall be limited in physical insertion as speciBed in Figure 1.
2.6 Axial Flux Difference: (Specincation 3.2.1) 4 2.6.1 The Axial Flux DilTerence (AFD) Target Band is + 3 %. - 12 %.
2.6.2 The indicated AFD may deviate outside the required band specified in 2.6.1 (above) at greater than or equal to 50 % but less than 90 % of RATED THERMAL POWER provided the indicated AFD is within the Acceptable Operation Limits as specifled in Figure 2.
2.7 Heat Flux Hot Channel Factor: (Specification 3.2.2) 2.7.1 F"o = 2.32
u:
2.7.2 -
K(Z) is specifled in Figure 3.
2.7.3 PFxy = 0.2 1
'2.7.4 The Fxy limits for Rated '1hermal Power within specific core planes shall be:
I 2.7.4.1 Fxy (RTP) less than or equal to 1.850 for all phnes containing banks D + C control rods; 2.7.4.2 Fxy (RTP) less timn or equal to 1.800 for all planes containing bank D control rods; 2.7.4.3 Fxy (RTP) less than or equal to 1.640 for all unrodded planes for cycle burnup from 0 up to 1.000 MWD /MTU 2.7.4.4 Fxy (RTP) less than or equal to 1.670 for all unrodded planes for cycle burnup from 1.000 up to 2.000 MWD /MTU; 2.7.4.5 Fxy (RIT) less than or equal to 1.680 for all unrodded planes for cycle burntip from 2.000 up through 8.000 MWD /MTU:
2.7,4.6 Fxy (RTP.i less than or equal to 1.630 for all unrodded planes for cycle
^
b?tmup from 8.000 up through 12.000 MWD /MTU:
2.7.4.7 Fxy (RTP) less than or equal to 1.620 for all unrodded planes for cycle burnup from 12,000 MWD /MTU onward; and 2.7.4.8 See Figure 4 for a plot of F (Z) x P(REL) versus axiq core height.
o 2.8 Nuclear Enthalpy Rise Hot Channel Factor: (Specillcation 3.2.3) 2.8.1 F%n= 1,49 2.8.2 PF n = 0.2 i
~
SEABROOK CYCLE 3 JUNE 1992 FIGURE 1 ROD BANK INSERTION LIMITS VERSUS TIIERMAL POWER FOUR-LOOP OPERATION I
(0.286,225)
(0.830,225) l
- 225 y
i ii
!i yi ;
i I
/l i
i
/ ;I l
l /
BANK B
/
I 200 I/
i
/
I
/
I/
I
/
,A l
l E
160 (0.0,164)
/
I l
3 1
/ ',
I (1.0,146)_
,/
I I
,,,/
m
/
BANK C i/
l en l
l j120 y'<
l /<
m
/
1
/
l l
/
/1 i
I
'I 80 l
8
/
I
/
l-1 I l
/
l f
/-
l ii l
CD u
B Z
1 I
/
BANK D I
l cc
-(0.0,4 91,i 7
40 i
7 i
l I
I
/l l
l 1
I V
!I i
I A l (0,31,0,0)
I I '
l 0
i i
O.0 0.2 0.4 0.6 0.8 1.0 1
Fraction of Rated Thermal Power l
Bank A must tw fully withdrawn
- prior 6 power operation.
Fdly Wnhdrawn is defined as the All-Rode-Oat posidon. The control rod insertion limits have been revised to permit ARO reposition ing between 225 and 232 steps withdrawn Rev. 05/27/92 12 54pm A-5 j
- pg)tj SEABR.OOK CYCLE 3 JUNE 1992
~
FIGURE 2 l-pse AXIAL FLUX DIFFERENCE LIMITS AS A FUNCTION 4y OF RATED TIIERMAL POWER l
6 120
- i i
i;}
i l
l i i
II I
unacceptableoperason I
,UnacceptzbieOpen6on -
l 100 I
II
(-1k,9k kl1.h)-
g i
7 g
d' 80 V
NI I
I w
7 f;
is i
l 1
/i I
i I\\
i I
7~ AcceptabeOperation.\\
i 6--
/
1 i
l
\\l Tu' oO =
, ji i
!.x
~g I !/
\\
E I
I 9 1,50)
(31,sr4 E
g I
l M
A l
I 20 I
I I
i i
i i i
- i
,;,j l
l l
l l l 1
iili I
I l
l l l l l
I I
I I
I i
l i i Ii I
III I
i 0
l i
i i
i i
i i
i 46 20 -10 0
10 20 30 40 50 Flux Difference (AI)%
Rev. 05/27/92 12:13pm A-6
" NN4 SEABROOK CYCLE 3 JUNE 1992 FIGURE 3 K(Z). NORMALIZED F (Z) AS A FUNCTION o
OF CORE IIEIGIIT
\\
1.2 l 10.0, 1.0! l l (6.0, 1.0) l l
l 110.8, 0.94 ) l 1.0
~
t
'N 7
N v
C l
l Lt
.80 n
O l
[
W N
\\
]
l(12.0,0.651
}
$.60 2
E O
l
{
I 40 K(Z)
ELEVATION (Feet) -'
l m
N 1.0 0.0 v
1.0 6.s M
0.94 10.8 g
}
0.65 12.0 l
.20 BASIS:
FQT = 2.32 I
l i
I i
1 0.00 0
2 4
f 8
10 12 i
CORE HEIGHT (FEET)
I g
h Rev. 05/19/92 2:4&pm A-7
fg '!,;
pg$1 SEABROOK CYCLE 3 JUNE 1992 FIGURE 4
)
MAXIARIM [F x P(REL)] VERSUS CORE IIEiGIrr q
k I
1 E
1 2>
i i
i i
i
}f0.0, 2.32)l
' ~l(6.0, 2.32)l
~
cro * *" r~6 i(10.8, 2.?8)l a
c g
0 D
i N
l
__o n.c,-c usour D
D o c oeo c
c.
2.0 o
l
~
1 oh
=
e a
(12.0. 1.51)l \\
- 1. a, o
.l 3
e 5
o l
o y
I.u-
~'
l i
n O~
1 2
3 4
5 6
7 8
9 10 11 12 CORE HEIGHT (FT)
Rev, 05/19/92 2:48pm A-8 l
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