ML20203E489

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Rev 1 to 97-R-2018-03, ANO-2,COLR for Cycle 14
ML20203E489
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 02/11/1999
From:
ENTERGY OPERATIONS, INC.
To:
Shared Package
ML20203E465 List:
References
97-R-2018-03, 97-R-2018-03-R01, 97-R-2018-3, 97-R-2018-3-R1, NUDOCS 9902170202
Download: ML20203E489 (12)
v • d • e


Text

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ENTERGY OPERATIONS ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 14 I

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97-R-2018-03 9902170202 990211 P

PDR ADOCK 05000368 Revision 1 P

PDR

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CORE OPERATING LIMITS REPORT FOR CYCLE 14 INDEX PAGE i

1.

INTRODUCTION 3

II.

SUMMARY

OF CHANGES 3

III.

AFFECTED TECHNICAL SPECIFICATIONS 4

IV.

CORE OPERATING LIMITS 5

V.

LIST OF FIGURES 7

2 97-R-2018-03 Revision 1 l

i ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LD11TS REPORT FOR CYCLE 14 1.

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 14.

l II.

SUMMARY

OF CHANGES j

Listed below are the changes to the COLR from the previous Revision of the Cycle 14 COLR.

Added clarification to the Core Operating Limit for Moderator Temperature Coefficient 4

(MTC) that a less positive (burnup dependent) MTC was credited later in the cycle in safety analyses.

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3 97-k-1018-03 Revision 1

l III.

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 l

3) 3.1.1.4 -

Moderator Temperature Coefficient l

1 l

4) 3.1.3.1 CEA Position

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5) 3.1.3.6 Regulating CEAInsertion Lhnits l

6) 3/4.2.1 Linear Heat Rate 7) 3.2.3 Azunuthal Power Tilt - Tq l

8) 3/4.2.4 DNBR Margin 9)

-3.2.7 Axial Shape Index

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d-

IV.

CORE OPERATING LIMITS I

The cycle-specific operating limits for the specifications listed are presented below.

1) 3/41.1.1 - SHUTDOWN MARGIN-Tg> 200 F The SHUTDOWN MARGIN 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 s 200'F g

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 in accordance with Figure 1. The Beginning of Cycle (BOC) positive COLR MTC limit line oiFigure 1 is from BOC to 166.4 EFPD. From 332.5 EFPD to End of Cycle (EOC) the positive COLR MTC limit i

line is linear from an MTC of 0.0 E-4 Ak/k/ F at 0% power to an MTC of-1.0 E-4 Ak/k/'F at 100% power which is bounded by the BOC positive MTC limit. Between 166.4 i

EFPD and 332.5 EFPD the positive MTC limit may be interpolated linearly with burnup.

4) 3.1.3.1 - CEA POSITION i

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 INSERTION 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 Groups 1 through 5 are at or above the Programmed Insertion Limit.

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l 97-R-2018-03 Revision 1 L

T 1

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6) 3/4 2.1 - LINEAR HEAT RATE i

l 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-Tg l

The measured AZIMUTHAL POWER TILT shall be maintained s 0.03.

8) 3/4 2.4 - DNBR MARGIN l

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

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%.

1 b)

With COLSS out of service and at least one CEAC operable - Operate within the i

l Region of Acceptable Operation shown on Figure 4, using any operable CPC channel.

1 I

l c)

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

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

i 9) 3 2.7 - AXIAL SHAPE INDEX 1

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

a)

COLSS IN SERVICE l

- 0.27 s ASI s + 0.27 l

b)

COLSS OUT OF SERVICE (CPC)

- 0.20 s ASI s + 0.20 l

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97-R-2018-03 Revision 1 i

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1

)

1 V.

LIST OF FIGURES Figure 1.

Moderator Temperature Coefficient Figure 2.

Required Power Reduction After CEA Deviation Figure 3.

CEA Insertion Limits 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) i l

7 97-R-2018-03 Revision 1

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FIGURE 1 Moderator Temperature Coefficient i

5 00E.05 i (0,O S0)

HJnacceptable Opertting lugion (20, 0.32) 1 0.00E +oO

.NQ (60, 0.00)

(11)0, -0.20

-5.00E-05 u-

-1.00E-04 eng Ac:eptable Operating Regiori 1.50E-04 E.

G!,

O 2.00E-04 2

-2.50E-04

-3.00E-04

" -3.40 E-04 6

T 1

1-T-

t' i

0 3.50EW 0

to 20 30 40 50 60 70 80 90 100 Core Power (% of Rated Thermal Power)

Note:

Per Technical Specification 3.1.1.4.a. and b., the Moderator Temperature Coefficient (MTC) maximum upper l

design limit shall be less positive than +0.5 x 10" Ak/k/'F whenever THERMAL POWER is s 70% of RATED l

THERMAL POWER and less positive than 0.0 x 10" Ak/k/*F w henever THERMAL POWER is > 70% of RATED THERMAL POWER. Therefore, the actual MTC must be less than the COLR upper limit at zero power. At all other powers, the actual MTC may be equal to the COLR upper limit.

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FIGURE 2 REQUIRED POWER REDUCTION AFTER CEA DEVIATION *

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

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(60 MIN.;20%)

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15 30 45 60 TIME AFTER DEVIATION (MINUTES) 9 97-R-2018-03 Revision 1

l FIGURE 3 CEA INSERTION LIMITS VERSUS THERMAL POWER i

i Groups 6 and P PDIL 110 (112 5,100)

'00 Transient insertion une I

80 l

(60.82 5)

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(0, 20) 20 10 0

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-10 CEA Posidon, inches Nthdrewt Note: Regulating Groups 1 through 5 at or above the Programmed Insertion Limit.

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97-R-2018-03 Revision 1

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FIGURE 4 l

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

ANO-2 Cycle Independent COOS Limit Minimum 1 CEAC Operable 2.8 r

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Revision 1 i

i FIGURE 5 4

I DNBR MARGIN OPERATING LIMIT BASED ON CORE PROTECTION CALCULATORS i

l (COLSS OUT OF SERVICE, BOTH CEACS INOPERABLE) 1 ANO-2 Cycle Independent COOS Limit Both CEACs Inoperable

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