2CAN100305, Cycle 17 Core Operating Limits Report

Cycle 17 Core Operating Limits Report

ML032810386
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/04/2003
From:	Cotton S Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
2CAN100305 CALC-A2-NE-2003-002-00, Rev. 0
Download: ML032810386 (14)

Text

Entergy Entergy Operations, Inc.

1448 S.R. 333 Russellville, AR 72802 Tel 501 858 5000 2CAN100305 October 4, 2003 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

Subject:

ANO-2 Cycle 17 Core Operating Limits Report Arkansas Nuclear One - Unit 2 Docket No. 50-368 License No. NPF-6

Dear Sir or Madam:

Arkansas Nuclear One, Unit 2 (ANO-2) Technical Specification 6.9.5.3 requires submittal of the Core Operating Limits Report (COLR) for each reload cycle. Attached is Revision 0 of the COLR for ANO-2 Cycle 17. This completes the reporting requirement for the referenced specification.

This submittal contains no commitments. Should you have any questions, please contact me.

Sincerely, Sherrie R. Cotton Director, Nuclear Safety Assurance SRC/dbb Attachment OI

I 2CAN100305 Page 2 of 2 cc:

Mr. Bruce S. Mallett Regional Administrator U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 NRC Senior Resident Inspector Arkansas Nuclear One P.O. Box 310 London, AR 72847 U. S. Nuclear Regulatory Commission Attn: Mr. Thomas W. Alexion Washington, DC 20555-0001 Mr. Bernard Bevill Director Division of Radiation Control and Emergency Management Arkansas Department of Health 4815 West Markham Street Little Rock, AR 72205

Attachment I 2CAN1 00305 ANO-2 Cycle 17 Core Operating Limits Report

CALC-A2-NE-2003-002-00, Rev. 0 ENTERGY OPERATIONS ARKANSAS NUCLEAR ONE - UNIT 2 CORE OPERATING LIMITS REPORT FOR CYCLE 17 1

CALC-A2-NE-2003-002-00, Rev. 0 INDEX PAGE I. INTRODUCTION 3

II.

SUMMARY

OF CHANGES 3

III. AFFECTED TECHNICAL SPECIFICATIONS 3

IV. CORE OPERATING LIMITS 4

V. LIST OF FIGURES 6

2

CALC-A2-NE-2003-002-00 Rev. 0 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 Cycle 17. This is Revision 0 of the Cycle 17 COLR.

H.

SUMMARY

OF CHANGES The COLR changes for the ANO-2 Cycle 17 reload are required to support the Cycle 17 reload.

These changes are listed in the table below with reference to the pertinent section of the current Cycle 16 COLR.

Cycle 16 COLR Section and Item Cycle 17 Change Modified the breakpoints that specify the times Moderator in cycle at which a less positive (burnup depen-3.1.1.4 Temperature Text dent) MTC was credited in the safety analyses.

Coefficient Changed the second breakpoint from 353.2 EFPD to 394.7 EFPD.

Modified the limit of 13.7 kW/ft (for burnups up Linear Heat to 187 EFPD) to 13.5 kWMft (for burnups up to 3/4.2.1 Rate Text and including 200 EFPD) and modified the limit of 12.6 kW/fl (for bumups exceeding 187 EFPD) to 12.7 kW/fl (for burnups exceeding 200 EFPD).

IH. AFFECTED TECHNICAL SPECIFICATIONS

1) 3/4.1.1.1

2) 314.1.1.2

3) 3.1.1.4

4) 3.1.3.1

5) 3.1.3.6

6) 3/4.2.1

7) 3.2.3

8) 3/4.2.4

9) 3.2.7 Shutdown Margin - Tavg > 200'F Shutdown Margin - Tavg S 200 0F Moderator Temperature Coefficient CEA Position Regulating CEA Insertion Limits Linear Heat Rate Azimuthal Power Tilt - Tq DNBR Margin Axial Shape Index 3

CALC-A2-NE-2003-002-00, Rev. 0 IV. CORE OPERATING LIMITS The cycle-specific operating limits for the specifications listed are presented below.

1) 3/4.1.1.1 - SHUTDOWN MARGIN-Tavg > 200OF The SHUTDOWN MARGIN shall be greater than or equal to 5.0 % Ak/k in Modes 1, 2, 3, and 4.

3/4.1.1.2 - SHUTDOWN MARGIN - Tavg

• 2000F 2)

The SHUTDOWN MARGIN shall be greater than or equal to 5.0% Ak/k in Mode 5.

3.1.1.4 - MODERATOR TEMPERATURE COEFFICIENT 3)

The Moderator Temperature Coefficient (MTC) shall be in accordance with Figure 1.

The Beginning of Cycle (BOC) positive COLR MTC limit line of Figure 1 is from BOC to 124.9 EFPD. From 394.7 EFPD to End of Cycle (EOC) the positive COLR MTC limit line is linear from an MTC of 0.0 E-4 Ak/k/0F at 0% power to an MTC of -1.0 E-4 Ak/k/WF at 100% power which is bounded by the BOC positive MTC limit. Between 124.9 EFPD and 394.7 EFPD the positive MTC limit may be interpolated linearly with burnup.

3.1.3.1 - CEA POSITION 4)

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.

3.1.3.6 - REGULATING CEA INSERTION LIMITS 5)

The regulating CEA groups (Groups 6 and 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.

4

I CALC-A2-NE-2003-002-00, Rev. 0 6) 3/4.2.1 - LINEAR HEAT RATE With COLSS out of service, the linear heat rate shall be maintained

• 13.5 kW/ft for cycle burnup up to and including 200 EFPD; and

• 12.7 kW/ft for burnup exceeding 200 EFPD.

7) 3.2.3 - AZIMUTHAL POWER TILT-To The measured AZIMUTHAL POWER TILT shall be maintained < 0.03.

8) 3/4.2.4 - DNBR MARGIN 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 10%.

b)

With COLSS out of service and at least one CEAC operable - Operate within the Region ofAcceptable Operation shown on Figure 4, 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 5, 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* ASI * + 0.27 b)

COLSS OUT OF SERVICE (CPC)

- 0.20 < ASI * + 0.20 5

I CALC-A2-NE-2003-002-00, Rev. 0 V. LIST OF FIGURES Figure 1 Moderator Temperature Coefficient Figure 2 Required Power Reduction After Inward CEA Deviation Figure 3 CEA Insertion Limits Versus Thermal Power Figure 4 DNBR Margin Operating Limit Based on Core Protection Calculators Figure 5 DNBR Margin Operating Limit Based on Core Protection Calculators 6

CALC-A2-NE-2003-002-00, Rev. 0 FIGURE 1 MODERATOR TEMPERATURE COEFFICIENT m rlI-ml w.ww 0.OOEt00O

-5.OOE I

(, 0.50)

Unacce l--

(532 I

~~~~~~~(50, 0.

[

Otable Ppera-ing Region l

35) l,_

cuW, p.00)

(Ibo, -0.20J I

. -1.00E-04 EI-I -1.50E-04 G) -,2.OOE-04V 0

6 -2.50E-04

-3.OOE-04

-3.50E.04

-4.OOE-04 Acceptable Oper ting eglon

-.~._

~..

m

-3.80 E-04 0

10 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 design limit shall be less positive than +0.5 x 104 Ak/k/ 0F whenever THERMAL POWER is

• 70% of RATED THERMAL POWER and less positive than 0.0 x 14 Ak/k/ 0F whenever 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.

7

CALC-A2-NE-2003-002-00, Rev. 0 FIGURE 2 REQUIRED POWER REDUCTION AFTER INWARD CEA DEVIATION*

30 25 IC

~20 I-11 0 "S

C 0lu i

15 L.

I z

10 E

,EES E

5 0

0 15 30 45 60 75 90 105 Time After Deviation (minutes)

• When core power is reduced to 60% of rated power per this limit curve, further reduction is not required 120 8

CALC-A2-NE-2003-002-00, Rev. 0 FIGURE 3 CEA INSERTION LIMITS VERSUS THERMAL POWER Groups 6 and P PDIL 110 100 1i

________(112.5.

100)

Transient Insertion Line 90 l

9 l X

4

<~~~~~~~~~~~~~~~(0 82.5) 25 80

(.13574) 70 (0,620) z60 30 E

10~~~~~

150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0

-10 CEA Position, Inches Withdrawn Note: Regulating Groups 1 through 5 at or above the Programmed Insertion Limit.

9

I CALC-A2-NE-2003-002-00, Rev. 0 FIGURE 4 DNBR MARGIN OPERATING LIMIT BASED ON CORE PROTECTION CALCULATORS ANO-2 Cycle Independent COOS Limit Lines Minimum One CEAC Operable 3.0 2.91-2.8 f ACCEPTABLE OPERATION Any Power Level (A

t

~~AVYEPTARLE o 0.04,2.83) 2.7 I Z6+

(-0.20.2.58)

OPERATION Power at or above 80%

2.5 I 2.4+

D N

B R

(-0.20.2.31)

Z3 I

(-009. 2.41)

ACCEPTABLE OPERATION Power at or above 90%

(-0.10, 1.99)

(020.2.83)

(020,2.41)

(0.20. 1.99)

Z2.2 21.1 2.0-(-0.20.1.94) 1.9 I 1.8 UNACCEPTABLE OPERATION Any Power Level 1.7 1.6_

-0.3I3

-0.2

-0.1 0.0 0.1 0.2 0.3 CPC Indicated ASI NOTE:

DNBR greater than indicated at the top of the figure is acceptable, provided the indicated ASI limits remain between the bounds that are shown for lower DNBR.

10

CALC-A2-NE-2003-002-00, Rev. 0 FIGURE 5 DNBR MARGIN OPERATING LIMIT BASED ON CORE PROTECTION CALCULATORS ANO-2 Cycle Independent COOS Limit Line Both CEACs Inoperable 4.2 4.1 4.0 f 3.9 +

3.8-3.7 D

N B

R ACCEPTABLE OPERATION Any Power Level (0.00,3.48)

(020,3.48)

(-0.20,3.20)

UNACCEPTABLE OPERATION Any Power Level 3.6 4 3.5 4-3.4 +

3.3 -

3.2 -

3.1 1 3.0

-0.30

-020

-0.10 0.00 0.10 0.20 0.30 CPC Indicated ASI NOTE:

DNBR greater than indicated at the top of the figure is acceptable, provided the indicated ASI limits remain between the bounds that are shown for lower DNBR.

11