ML20140E038

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Rev 0 to 96-R-2015-02, ANO - Unit 2 COLR for Cycle 13
ML20140E038
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 06/04/1997
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20140E036 List:
References
96-R-2015-02, 96-R-2015-02-R00, 96-R-2015-2, 96-R-2015-2-R, NUDOCS 9706110216
Download: ML20140E038 (14)
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i ENTERGY OPERATIONS I ARKANSAS NUCLEAR ONE - UNIT 2 4

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. CORE OPERATING LIMITS REPORT f FOR CYCLE 13 I

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I 96-R-2015-02 Revision 0 I

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CORE OPERATING LIMITS REPORT FOR CYCLE 13 4

INDEX PAGE I. INTRODUCTION 3 II.

SUMMARY

OF CHANGES 3 III. AFFECTED TECHNICAL SPECIFICATIONS 4 I

IV. CORE OPERATING LIMITS 5 i

V. METHODOLOGES 7 VI. LIST OF FIGURES 8 1

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i ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 13 h

L IN TRODUCTION

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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 ?J. The core operating limits have been developed using the NRC approved methodologies specified in Section V. This is Revision 0 of the Cycle 13 COLR.

IL

SUMMARY

OF CliANGES Listed b: low are the changes to the COLR from the latest revision of the Cycle 12 COLR.

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  • The specifc values for MTC have been upf,ated for cycle 13.
  • The PDIL for Group 6 and P has been combined into one PDIL with a restriction regarding simultaneous insertion above 80% power.

e The COLSS cut of service limit lines have been updated. Additionallines were added to the I g CEAC operable plot to reflect the new analyses.

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  • The CENTS code was added to the reference list.

i The statement of' Movable Control Assemblies' was removed from the CESEC reference to be j consistent with the actual technical specification title.

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[; 3 96-R-2015-02 Revisica o

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. [IL- AFFECTED TECHNICAL SPECIFICATIONS l

1) 3/4.1.1.1 Shutdown Margin - Tavg > 200*F I
2) 3/4.1.1.2 Shutdown Margin - Tavg s200 F ,

l 3) 3.1.1.4 Moderator Temperature Coefficient l

l 4) 3.1.3.1 CEA Position

5) 3.1.3.6 Regulating CEA Insenion Limits
6) 3/4.2.1 Linear Hect Rate
7) 3.2.3 Azimuthal Power Tilt - Tq
8) 3/4.2.4 DNBR Margin I
9) 3.2.7 Axial Shape Index 1

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IV. ' CORE OPERATING LIMITS The cycle-specific operating limits for the specifications listed are presented below.

1) 3/4.1.1.1 - SHUTDOWN MARGIN- Ta> 200*F The SHUTDOWN MARG {N shall be greater than or equal to 5.0 % Ak/k in Modes 1,2, ,

3, and 4.

2) 3/4.1.1.2 - SHUTDOWN MARGIN - T 3yg s 200*F 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 Modernor Temperature Coefficient (MTC) shall be:

a) in accordance with Figure 1 b) less negative than - 3.4 E-4 A k/k/*F at RATED THERMAL POWER

4) 3.1.3.1 - CEA POSITION With one or more CEAs trippable but misaligned from any other CEAs in its group by more than the Technical Specification 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 INSE~ R TION LIMITS The regulating CEA groups (groups 6 & P) shall be limited to the withdrawal and insertion limits shown on Figure 3. Figure 3 assumes that Banks 1 through 5 are fully withdrawn.

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6) 3/4.2.1 - LINEAR HEAT RATE With COLSS out of service, the linear heat rate shall be maintained s 13.5 kw/ft .
7) 3.2.3 - AZIMUTHAL POWER TILT- T2 The measured AZIMUTHAL POWER TILT shall be maintained s 0.03.
8) 3/4.2.4 - DNBR MARGIN The DNBR limit shall be maintained by one of the following methods:

With COLSS in service and neither CEAC operable - Maintain COLSS calculated  ;

a)  !

core power less than or equal to COLSS calculated core power operating limit '

based on DNBR decreased by 13%. 1 With COLSS out of service and at least one CEAC operable - Operate within the b)

Region of Acceptable Operation shown on Figure 5, using any operable CPC channel.

With COLSS out of service and neither CEAC operable - Operate within the c)

Region of Acceptable Operation shown on Figure 6, using any operable CPC channel.

9) 3.2.7 - AXIAL SHAPE INDEX The core average AXIAL SHAPE INDEX (ASI) shall be maintained within the following limits:

a) COLss IN SERVICE

- 0.27 s ASI s + 0.27 b) COLSS OUT OF SERVICE (CPC)

- 0.20 s ASI s + 0.20 6

96-R-2 "

Rivi . < a

V. ' METHODOLOGIES The analytical methods used to determine the core operating limits listed above are those previously reviewed and approved by the NRC in:

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 l l

CEAInsertion Limits.

2) "CE Method for Control Element Assembly Ejection Analysis," CENPD-0190-A, January j 1976. Methodology for the CEA Insenion Limits and Azimuthal Power Tilt.  ;
3) " Modified 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.

" Calculative Methods for the CE Large Break LOCA Evaluation Model," CENPD-132-P, 4)

August 1974. Methodology for the limits on the Linear Heat Rate and Azimuthal Power

' Tilt.  ;

" Calculational Methods for the CE Large Break LOCA Evaluation Model," <

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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. l

" Calculative Methods for the CE Large Break LOCA Evaluation Model for the Analysis 7) of CE and y{ 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.

" Calculational Methods for the CE Small Break LOCA Evaluation Model,"

8) j 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, CEA Position, CEA Insenion Limits, and DNBR Margin.

" Technical Mar.ual for the CENTS Code," CENPD 282-P-A, February 1991 Methodology 10) for the Tunits on the Shutdown Margins, MTC, CEA Position, CEA Insenion Limits, and DNBR Margin.

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VL LIST OF FIGURES Figure 1. Moderator Temperature Coefficient 4

Figure 2. Required Power Reduction After CEA Deviation Figure 3. CEA Insertion Limits Versus Thermal Power Figure 4. Intentionally Deleted Figure 5. DNBR Margin Operating Limit Based on Core Protection

  • Calculators (COLSS Out of Sewice, CEAC Operable) 4 Figure 6. DNBR Margin Operating Limit Based on Core Protection l

Calculators (COLSS Out of Service, Bo:h CEACs Inoperable) i j

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i FIGURE 1 MODERATOR TEMPERATURE COEFFICIENT 5.00E-05 l I I ~

Unacceptable ~

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Operating Region (0,0 33) N .

(20,0.2) 0.00E+00 (50'0)

N N

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-5 00E-05 (90,.0.4) (100,. 42)

-1.00E-04 j Acceptable Operating' -

Region

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W g 2 00E-04 s

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-3.50E-04 40 50 60 70 60 90 100 0 10 20 30 CORE POWER (% OF RATED THERMAL POWER) 96-R-2015-02 9 Revision 0

t FIGURE 2 REQUIRED POWER REDUCTION AFTER CEA DEVIATION

  • aWhen core power is reduced to 60% of rated power per this limit curve, further reduction is not required 30 1

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  1. MISAUGNMENT i

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3 FIGURE 3 4

CEA INSERTION LIMITS VERSUS TilERMAL POWER Groups 6 and P PDil(1)

Simultaneous insertion of Group 6 AND P Prohibited unless during a downpower 110

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(112.5,100) r" 100 - Transient insertion Line 90

! (60,82.5) A 80 (135,74)l. 'y

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(O. 82.5) g 70 s (112.5, 65)

~ 60  %

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(60, 44)

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  • 40 E .3  %
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  • Isth 30 P*L  %

(0,20 20 S$ $$3$$  %

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0 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 -10 CEA Position, Inches WKi;. .tawn ,

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1) Regulating Banks 1 through 5 in Full-Out Position i

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FIGURE 4 ,

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GROUP P INSERTION LIMIT VERSUS THERMAL POWER  ;

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INTENTIONALLY DELETED j

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96-R-2015-02  :

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FIGURE 5 4

DNBR MARGIN OPERATING LIMIT BASED l ON CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, CEAC OPERABLE)

ANO-2 Cycle independent COOS Limit

! Minimum 1 CEAC Operable 2.8 ACCEPTABLE OPERATION Any Power Level 27' (om,2.es) f 1

(o.03,2.se) l 2.6- j ACCEPTABLE OPERATION 2.5 - Power at or above 80%  !

l 1 (4.20 2.4s) l (0.20,2.as)

D 2.4-N (4.to,2.as)

B R 2.3 - (4.2o, tso)

ACCEPTABLE OPERATION Power at or above 90%

(

2.2-(4. o,2.ce) 2.1 om,2.oe) l

( 4.20, 2.01) 2.0 - UNACCEPTABLE OPERATION l Any Power Level 1.9

-0.30 -0.20 -0.10 0.00 0.10 0.20 0.30 CPC Indicated ASI 13 96-R-2015-02 Revision 0 W

, 1 FIGURE 6 i

DNBR MARGIN OPERATING LIMIT BASED f ON CORE PROTECTION CALCULATORS (COLSS OUT OF SERVICE, BOTH CEACS INOPERABLE) j i

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ANO-2 Cycle Independent COOS Limit

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Both CEACs Inoperable

3.2 ACCEPTABLE OPERATION

' Any Power level 3.0 -

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J R j 2.6 (4.20,2.as) l UNACCEPTABLE OPERATION j

! Any Power Level i

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-0.10 0.00 0.10 0.20 0.30

-0.30 -020 CPC Indicated ASI

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