ML20065L830

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COLR for Cycle 11
ML20065L830
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 04/13/1994
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20065L650 List:
References
94-R-2003-01, 94-R-2003-01-R00, 94-R-2003-1, 94-R-2003-1-R, NUDOCS 9404220001
Download: ML20065L830 (12)
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Text

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  • ENTERGY OPERATIONS ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 11 1

94-R-200341. Revision 0 9404220001 DR ADOCK 0500 8

ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 11 INDEX PAGE I. INTRODUCTION 3 II. AFFECTED TECHNICAL SPECIFICATIONS 3 III, CORE OPERATING LIMITS 4 IV. METIIODOLOGIES 6 V. LIST OF FIGURES 7 I

l 2

94-R 2003-01, Revision 0 i

ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 11 I. 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 11. The core operating limits have been developed using the NRC approved methodologies specified in Section IV. This is the initialissuance of the

, Cycle 11 COLR.

II. AFFECTED TECIINICAL 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 Coeflicient
4) 3.1.3.1 Movable Control Assemblies - CEA Position
5) 3.1.3.6 Regulating CEA Insertion Limits
6) 3.1.3.7 Part Length CEA Insertion Limits
7) 3/4.2.1 Linear Heat Rate
8) 3.2.3 Azimuthal Power Tilt - T q
9) 3/4.2.4 DNBR Margin
10) 3.2.7 Axial Shape Index 3

94-R-2003-01, Revision 0

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

1) 3/4.1.1 1 - SHUTDOWN MARGIN- Tg ?00 F The SHUTDOWN MARGIN shall be greater than or equal to 5.5% Ak/k in Modes 1,2,3, and 4.
2) 3/41.1.2 - SHUTDOWN MARGIN - Tg 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 Moderator Temperature Coeflicient (MTC) shall be:

a) less positive than + 0.5 E-4 A k/k/ F whenever TFERMAL POWER is s 70% ofRATED TIERMAL POWER b) less positive than 0.0 A k/k/ F whenever THERMAL POWER is > 70%

of RATED THERMAL POWER c) 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 full length or part length 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 Modes 1 and 2 core power reduction is specified in Figure 1.
5) 3 1.3.6 - REGULATING CEA INSERTION LIMITS The regulating CEA groups shall be limited to the withdrawal sequence and to the insertion limits shown on Figure 2.

4 94-R-20034)l, Revision 0

.. . . . . . ~ - - -. . . .. . - - - .- .

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6) 3.1.3.7 - PART LENGTH CEA INSERTION LIMITS The part length CEA group shall be limited to the insertion limits shown on Figure 3.
7) 3/4.2.1 - LINE21WEAT RATIi With COLSS out of service, the linear heat rate shall be maintained s 12.1 kWM .
l
8) 3.2.3 - AZlMUTHAL POWER TILT- T g The measured AZIMUTHAL POWER TILT shall be maintained s 0.03.
9) 3/4.2.4 - DNBR MARGIN ]

l The DNBR limit shall be maintained by one of the following methods:

a) With COLSS out of service and at least one CEAC operable - Operate within the Region of Acceptable Operation shown on Figure 4, using any operable CPC channel.

b) With COLSS out of service and neither CEAC operable - Operate within the Region of Acceptable Operation shown on Figure 5, using any operable CPC channel.

10) ,12.7 - AXIAL SIIAPFulNDEX 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 5

94-R 2003-01, Revision 0 k,

IV. 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, and the Regulating CEA Insertion Limits.
2) "CE Method for Control Element Assembly Ejection Analysis," CENPD-0190-A, _

January 1976. Methodology for the Regulating CEA Insertion Limits and Azimuthal Power Tilt.

3) " Statistical Combination of Uncertainties Combination of System Parameter Uncertainties in Thermal Margin Analyses for Arkansas Nuclear One Unit 2" CEN-139(A)-P, November 1980. Methodology for the limits on the DNBR Margin and the ASL
4) " Calculative Methods for the CE Large . Break LOCA Evaluation Model,"

CENPD-132-P, August 1974. Methodology for the limits on the Linear I Heat Rate and Azimuthal Power Tilt.

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

CENPD-132-P, Supplement 1, Febmary 1975. Methodology for the limits on the MTC, Linear Heat Rate, Azimuthal Power Tilt and ASI. I 1

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 ASL q

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

CENPD-137-P, August 1974. Methodology for the limits on the MTC, 'l Linear Heat Rate, AzimuthalPower Tilt and ASI.

8) "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, Regulating  !

CEA Insertion Limits, Part Length CEA Insertion Limits and Azimuthal Power Tilt.

6 94-R 2003-01, Revision 0

)

I V. LIST OF FIGURES l l

Figure 1. Required Power Reduction AAer CEA Deviation Figure 2. CEA Insenion Limits Versus Thermal Power Figure 3. Part Length CEA Insertion Limit Versus Thermal Power Figure 4. DNBR Margin Operating Limit Based on Core Protection  :

Calculators (COLSS Out of Service, CEAC Operable)

Figure 5. DNBR Margin Operating Limit Based on Core Protection Calculators (COLSS Out of Service, Both CEACs Inoperable) 7 94-R-2003-01, Revision 0 '

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FIGURE 1 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 z

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94-R 2003 01, Revision 0 l

-. - 1- +-r -* e- A FIGURE 2 CEA INSERTION LIMITS VERSUS TIIERMAL POWER

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94-R 2003-01, Revision 0

FIGURE 3 PART LENGTII CEA INSERTION LI.MIT VERSUS TIIERMAL POWER o

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10 94 R 2003-01. Revision 0 i

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FIGURE 4 DNDR MARGIN OPERATING LIMIT BASED ON CORE PROTECTION CALCULATORS (COL SS OUT OF SERVICE, CEAC OPERABLE)

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s g- CORE AVERAGE AXIAL SHAPE NDEX O

_ _ _ _ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . . _ . _ _ _ _ . __ ___m__ __ _ _ . _ _ _ _ _ ___ _ . _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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