ML20117M363
| ML20117M363 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/05/1996 |
| From: | ENTERGY OPERATIONS, INC. |
| To: | |
| Shared Package | |
| ML20117M271 | List: |
| References | |
| 95-R-2003-01, 95-R-2003-01-R01, 95-R-2003-1, 95-R-2003-1-R1, NUDOCS 9609170407 | |
| Download: ML20117M363 (14) | |
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ENTERGY OPERATIONS ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 12 1
95-R-2003-01 j
Revision 1 hDR ADOKOS000b68 P
l CORE OPERATING LIMITS REPORT FOR CYCLE 12 INDEX PAGE I.
INTRODUCTION 3
II.
SUMMARY
OF CHANGES 3
III.
AFFECTED TECHNICAL SPECIFICATIONS 4
IV.
CORE OPERATING LIMITS 5
V.
METHODOLOGIES 7
VI.
LIST OF FIGURES 8
i 2
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ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 12 L
INTRODUCTION This CORE OPERATING LIMITS REPORT (COLR) has been prepared in accordance with the requirements of Arkansas Nuclear One - Unit 2 (ANO-2) Technical Specification 6.9.5 for ANO-2's Cycle 12. The core operating limits have been developed using the NRC approved i
methodologies specified in Section V. This is Revision 1 of the Cycle 12 COLR.,
IL
SUMMARY
OF CHANGES Listed below are the changes to the COLR from Revision 0 of the Cycle 12 COLR.
i The Long Term Steady State Insertion Limit line shown on Figure 4, Group P Insertion Limit e
Versus Thermal Power," was moved to the left. The intersection point is now 112.5 and 0.65.
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k 95-R-2003-01 Revision 1 i
l
I l
IIL AFFECTED TECHNICAL SPECIFICATIONS 1) 3/4.1.1.1 Shutdown Margin - Tavg > 200'F 2) 3/4.1.1.2 Shutdown Margin - Tavg s 200 F 3) 3.1.1.4 Moderator Temperature Coefficient 4) 3.1.3.1 Movable Control Assemblies - CEA Position 5) 3.1.3.6 Regulating CEAInsertion Limits 6) 3/4.2.1 Linear Heat Rate 7) 3.2.3 Azimuthal Power Tilt - Tq l
8) 3/4.2.4 DNBR Margin 9) 3.2.7 Axial Shape Index e
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l IV.
CORE OPERATING LIMITS The cycle-specific operating limits for the specifications listed are presented below.
1) 3/4.1 1.1 - SHUTDOWN MARGIN-Tava > 200 F The SHUTDOWN MARGIN shall be greater than or equal to 6.5 % Ak/k in Modes 1, 2, 3, and 4.
g ; 200 F 2) 3/4.1.1.2 - SHIJTDOWN MARGIN - T s
The SHUTDOWN MARGIN shall be greater than or equal to 5.0% Ak/k in Mode 5.
3) 3.1.1.4 - MODERATOR TEMPERATURE COEFFICIENT The Moderator Temperature Coefficient (MTC) shall be:
a) in accordance with Figure I i
b) less negative than - 3.4 E-4 A k/k/ F at RATED THERMAL POWER 4) 3.1.3.1 - MOVABLE CONTROL ASSEMBLIES - CEA POSITION With one or more CEAs trippable but misaligned from any other CEAs in its group by more than the Technical Spectfication 3.1.3.1 allowed value, the minimum required core power reduction for Modes 1 and 2 is specified in Figure 2.
5) 3.1.3.6 - REGULATING CEA INSERTION LIMITS The regulating CEA. groups shall be limited to the withdrawal and insertion limits shown on Figure 3. Figure 3 assumes that Banks 1 through 5 are fully withdrawn.
Group P shall be limited to the insertion limits shown on Figure 4. Figure 4 assumes Banks I through 5 are fully withdrawn.
5 95-R-2003-01 Revision 1
l 6)
?/4.2.1 - LINEAR HEAT RATE With COLSS out of service, the linear heat rate shall be maintained s 13.5 kW/ft.
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7) 3.2.3 - AZIMUTHAL POWER TILT T g
The measured AZIMUTHAL POWER TILT shall be maintained s 0.03.
i i
8) 3/4.2.4 - DNBR MARGIN The DNBR limit shall be maintained by one of the following methods:
I l
a)
With COLSS in service and neither CEAC operable - Maintain COLSS calculated core power less than or equal to COLSS calculated core power operating limit based on DNBR decreased by 13%.
j b)
With COLSS out of service and at least one CEAC operable - Operate within the Region of Acceptable Operation shown on Figure 5, using any operable CPC
]
channel.
c)
With COLSS out of service and neither CEAC operable - Operate within the Region of Acceptable Operation shown on Figure 6, using any operable CPC channel.
1 9) 3.2.7 - AXIAL SHAPE INDEX The core average AXIAL SHAPE INDEX (ASI) shall be rnaintained within the following limits:
a)
COLSS IN SERVICE
. 0.27 s ASI s + 0.27 b)
- 0.20 s ASI s + 0.20 6
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V.
METHODOLOGIES The analytical methods used to determine the core operating limits listed above are those previously reviewed and approved by the NRC in:
l 1)
"The ROCS and DIT Computer Codes for Nuclear Design," CENPD-266-P-A, April 1983. Methodology for the limit on Shutdown Margins, MTC, DNBR Margin and the CEAInsertion Limits.
2)
"CE Method for Control Element Assembly Ejection Analysis," CENPD-0190-A, January j
1976. Methodology for the CEA Insertion Limits and Azimuthal Power Tilt.
l 3)
" Modi 6ed Statistical Combination of Uncertainties," CEN-356(V)-P-A, Revision 01-P-A, May 1988. Methodology for the limits on the DNBR Margin and the ASI.
4)
" Calculative Methods for the CE Large Break LOCA Evaluation Model," CENPD-132-P, August 1974. Methodology for the limits on the Linear Heat Rate and Azimuthal Power Tilt.
5)
" Calculational Methods for the CE Large Break LOCA Evaluation Model,"
CENPD-132-P, Supplement 1, February 1975. Methodology for the limits on the MTC, Linear Heat Rate, Azimuthal Power Tilt and ASI.
6)
" Calculational Methods for the CE Large Break LOCA Evaluation Model,"
CENPD-132-P, Supplement 2-P, July 1975. Methodology for the limits on the MTC, Linear Heat Rate, Azimuthal Power Tilt and ASI.
7)
" Calculative Methods for the CE Large Break LOCA Evaluation Model for the Analysis of CE and W Designed NSSS," CEN-132, Supplement 3-P-A, June 1985. Methodology for Specification 3.1.1.4 for MTC,3.2.1 for Linear Heat Rate,3.2.3 for Azimuthal Power Tilt, and 3.2.7 for ASI.
8)
" Calculational Methods for the CE Small Break LOCA Evaluation Model,"
CENPD-137-P, August 1974. Methodology for the limits on the MTC, Linear Heat Rate, Azimuthal Power Tilt and ASI.
9)
"CESEC - Digital Simulation of a Combustion Engineering Nuclear Steam Supply System," December 1981. Methodology for the limits on the Shutdown Margins, MTC, Movable Control Assemblies - CEA Position, CEA Insertion Limits, DNBR Margin and Azimuthal Power Tilt.
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VL LIST OF FIGURES i
Figure 1.
. Moderator Temperature Coefficient Figure 2.
Required Power Reduction After CEA Deviation Figure 3.
CEA Insertion Limits Versus Thermal Power f
Figure 4.
Group P Insertion Limit Versus Thermal Power
. Figure 5.
DNBR Margin Operating Limit Based on Core Protection
)
Calculators (COLSS Out of Service, CEAC Operable)
Figure 6.
DNBR Margin Operating Limit Based on Core Protection Calculators (COLSS Out of Service, Both CEACs Inoperable) i i
l l
l I
l i
k 4
1 l
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FIGURE 1 MODERATOR TEMPERATURE COEFFICIENT 8.5E 04
\\,,,,33 N
UNACCEPTABLE X
CPERATING REGION
.i
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i
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l (50.01 1
(70. B.88)
(108. 0.2) i
-0.5E 04 i
t b
^
LL W
-1.0E 84 W
T i
4 O
W i
O N
(
-1.5E 04 M
4-ACCEPTABLE
[
OPERATING REGION W
9
-2.0E 04 0
t--Z 2.5E 04 3.0E 84 3.4E 94
-3.5E 84 8
19 29 39 48 58 68 78 80 98 184 CORE POWER (% OF RATED THERMAL POWER) 3 95,R-2003-01 Revislom 1
.. _. _. _ _ -.. _ ~ _ _ _ _ _. _. _ _ _
i
.\\
FIGURE 2 s
REQUIRED POWER REDUCTION AFTER CEA DEVIATION
- i
- When core power is reduced to 60% of rated power per this limit curve, j
further reduction is not required i
i M
i Z
9 i
B i
3 Q
(60 MIN.;20%)
)
mi r
3o
.ar' wg
.ar Og
- n" f
Nig
& Q m%
.d
0 d
J A
1 s <z 10 c
w
\\
o ar W#
CEA s
E~
MISAUGNMENT i
r 2
3 l-3
, s j
0 l
3 0
15 30 45 60 TIME AFTER DEVIATION (MINUTES) 4 k
10 l
95-R-2003-01 i
Revision 1 1
)
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I 4
FIGURE 3 CEA INSERTION LIMITS VERSUS THERMAL POWER i
j 1.1 4
' ::.:,1 ;
insertion Limit j
i w
h0'9 o
!I i
l
/
- "sm
/
Q. 0.8 '
0.7 (o.s m 0.6 3"
l1l il D
l
" 0.3 30.2.
LL, 0.1 O
150 Y20 90 60 ' -
30 0
CEA Bank 6 Position, inches withdrawn (Regulating Banks i through 5 in FuM)ut Position) 11 95-R-2003-01 Revision 1
i FIGURE 4 GROUP P INSERTION LIMIT VERSUS THERMAL POWER j
l 1.1 l
l l
1 0.9 uO3o 0.8 Transkmt O-Insertion Umit 74) g
,4 E 07 s
J,.es) d p.0.6 f
e ~5 l))
N 0
O 0.4 f
D 0.3 I
li ci I
1 7
OJ2 0.1' O
150 -
120 90' 60 30 0
CEA Bank P Position, inches withdrawn (Regulating Banks 1 through 51n Full-Out Position) 12 95-R-2003 01 Revision 1
l I
FIGURE 5 l
DNBR MARGIN OPERATING LIMIT BASED ON CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, CEAC OPERABLE) y I
e d
E 3
"(
.k T
E s
\\
g h
a W
I
\\
g N
(
b K
W 8
g s
N3 I
A
?
e1$
N k
EfGNO 3'19YMO 17Y WnNNIW Odo 13 95-R-2003-01 Revision 1
4 o
i FIGURE 6 i
DNBR MARGIN OPERATING LIMIT BASED ON CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, BOTH CEACS INOPERABLE) i 1
N g
S
^
i 1
g j
i I
W k
l
=
g s
a a
a g
l T'
i I
n e4 e
9 4
N N
hiGNG 3'IGYMOT1Y WONNIW Odo 14 95-R-2003-01 Revision 1
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