1CAN102203, Cycle 31 Core Operating Limits Report

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Cycle 31 Core Operating Limits Report
ML22297A101
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 10/24/2022
From: Keele R
Entergy Operations
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
1CAN102203
Download: ML22297A101 (1)
v • d • e


Text

Riley D. Keele, Jr.

Manager, Regulatory Assurance Arkansas Nuclear One Tel 479-858-7826 1CAN102203 October 24, 2022 ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

ANO-1 Cycle 31 Core Operating Limits Report Arkansas Nuclear One - Unit 1 NRC Docket No. 50-313 Renewed Facility Operating License No. DPR-51

Dear Sir or Madam:

Entergy Operations, Inc. (Entergy) Arkansas Nuclear One, Unit 1 (ANO-1) Technical Specification 5.6.5 requires the submittal of the Core Operating Limits Report (COLR) upon issuance for each reload cycle. Enclosed is the ANO-1 Cycle 31 COLR. Please note that the latest approved revision number of the Babcock and Wilcox Topical Report BAW-10179P-A is identified in the COLR as Revision 9, November 2017. In addition, the approved revision number of the Entergy Reactor Physics Methods Report is identified in the COLR as Revision 0, December 1993.

There are no new commitments contained in this submittal.

This completes the reporting requirement of the stated specification. Should you have any questions, please contact Riley Keele, Manager, Regulatory Assurance at 479-858-7826.

Respectfully, Digitally signed by Riley D. Keele Jr.

DN: cn=Riley D. Keele Jr., c=US, o=Regulatory Assurance, email=rkeele@entergy.com Reason: I am approving this document Date: 2022.10.24 09:36:24 -05'00' RDK/mar

Enclosure:

ANO-1 Cycle 31 Core Operating Limits Report (COLR)

Entergy Operations, Inc. 1448 SR 333, Russellville, AR 72802

1CAN102203 Page 2 of 2 cc: NRC Region IV Regional Administrator NRC Senior Resident Inspector - Arkansas Nuclear One NRC Project Manager - Arkansas Nuclear One Designated Arkansas State Official

Enclosure 1CAN102203 ANO-1 Cycle 31 Core Operating Limits Report (COLR)

(36 pages)

CYCLE 31 COLR ENTERGY OPERATIONS ARKANSAS NUCLEAR ONE UNIT ONE CYCLE 31 CORE OPERATING LIMITS REPORT ANO-1 1 Revision 0

CYCLE 31 COLR 1.0 CORE OPERATING LIMITS This Core Operating Limits Report for ANO-1 Cycle 31 has been prepared in accordance with the requirements of Technical Specification 5.6.5. The core operating limits have been developed using the methodology provided in the references.

The following cycle-specific core operating limits are included in this report:

1) 2.1.1.3 Variable Low RCS Pressure - Temperature Protective Limits
2) 3.1.1 SHUTDOWN MARGIN (SDM)
3) 3.1.8 PHYSICS TESTS Exceptions - MODE 1
4) 3.1.9 PHYSICS TEST Exceptions - MODE 2
5) 3.2.1 Regulating Rod Insertion Limits
6) 3.2.2 AXIAL POWER SHAPING RODS (APSR) Insertion Limits
7) 3.2.3 AXIAL POWER IMBALANCE Operating Limits
8) 3.2.4 QUADRANT POWER TILT (QPT)
9) 3.2.5 Power Peaking
10) 3.3.1 Reactor Protection System (RPS) Instrumentation
11) 3.4.1 RCS Pressure, Temperature, and Flow DNB Limits
12) 3.4.4 RCS Loops - MODES 1 and 2
13) 3.9.1 Boron Concentration Note:

The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

2.0 REFERENCES

1. "Safety Criteria and Methodology for Acceptable Cycle Reload Analyses," BAW-10179P-A, Rev. 9, Framatome ANP, Inc., Lynchburg, Virginia, November 2017.

2 "Qualification of Reactor Physics Methods for the Pressurized Water Reactors of the Entergy System," ENEAD-01-P, Rev. 0, Entergy Operations, Inc., Jackson, Mississippi, December 1993.

3. Framatome Document, "Transmittal of ANO1-31 Limits and Setpoints", FS1-0063789-1.0, August 15, 2022.
4. Framatome Document, "Transmittal of the ANO-1 Cycle 31 Reload Report",

FS1-0063813-2.0, August 31, 2022, CALC-ANO1-NE-22-00003.

5. Framatome Document, "Transmittal of ANO1-31 Core Load Plan (CLP)", FS100640591.0, September 8, 2022, CALC-ANO1-NE-22-00004.
6. "IC (Initial Condition) DNB RCS Protection Criteria," CALC-96-E-0023-02, Rev. 7.
7. Framatome Document, "Transmittal of ANO1-31 Reload Technical Document (RTD)",

FS1-0063728-2.0, August 24, 2022, CALC-ANO1-NE-22-00002.

ANO-1 2 Revision 0

CYCLE 31 COLR Table Of Contents REACTOR CORE SAFETY LIMITS Fig. 1 Variable Low RCS Pressure-Temperature Protective Limits................................. 5 Fig. 2 AXIAL POWER IMBALANCE Protective Limits..................................................... 6 SHUTDOWN MARGIN (SDM) ...................................................................................................... 7 REGULATING ROD INSERTION LIMITS Fig. 3-A Regulating Rod Insertion Limits for Four-Pump Operation From 0 to 200 +/- 10 EFPD...................................................................................... 8 Fig. 3-B Regulating Rod Insertion Limits for Four-Pump Operation From 200 +/- 10 EFPD to EOC ............................................................................... 9 Fig. 4-A Regulating Rod Insertion Limits for Three-Pump Operation From 0 to 200 +/- 10 EFPD ................................................................................... 10 Fig. 4-B Regulating Rod Insertion Limits for Three-Pump Operation From 200 +/- 10 EFPD to EOC ............................................................................. 11 Fig. 5-A Regulating Rod Insertion Limits for Two-Pump Operation From 0 to 200 +/- 10 EFPD ................................................................................... 12 Fig. 5-B Regulating Rod Insertion Limits for Two-Pump Operation From 200 +/- 10 EFPD to EOC ............................................................................. 13 AXIAL POWER SHAPING RODS (APSR) INSERTION LIMITS ............................................... 14 AXIAL POWER IMBALANCE OPERATING LIMITS Fig. 6-A1 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Four-Pump Operation from 0 EFPD to 200 +/- 10 EFPD ...................................... 15 Fig. 6-A2 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Four-Pump Operation from 200 +/- 10 EFPD to EOC ........................................... 16 Fig. 6-B1 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions for Four-Pump Operation from 0 EFPD to 200 +/- 10 EFPD ...................................... 17 Fig. 6-B2 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions for Four-Pump Operation from 200 +/- 10 EFPD to EOC ........................................... 18 Fig. 6-C1 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Four-Pump Operation from 0 EFPD to 200 +/- 10 EFPD ...................................... 19 Fig. 6-C2 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Four-Pump Operation from 200 +/- 10 EFPD to EOC ........................................... 20 Fig. 7-A1 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Three-Pump Operation from 0 EFPD to 200 +/- 10 EFPD .................................... 21 Fig. 7-A2 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Three-Pump Operation from 200 +/- 10 EFPD to EOC ......................................... 22 ANO-1 3 Revision 0

CYCLE 31 COLR Fig. 7-B1 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions for Three-Pump Operation from 0 EFPD to 200 +/- 10 EFPD .................................... 23 Fig. 7-B2 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions for Three-Pump Operation from 200 +/- 10 EFPD to EOC ......................................... 24 Fig. 7-C1 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Three-Pump Operation from 0 EFPD to 200 +/- 10 EFPD .................................... 25 Fig. 7-C2 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Three-Pump Operation from 200 +/- 10 EFPD to EOC ......................................... 26 Fig. 8-A AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Two-Pump Operation from 0 EFPD to EOC ........................................................ 27 Fig. 8-B AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions for Two-Pump Operation from 0 EFPD to EOC ........................................................ 28 Fig. 8-C AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Two-Pump Operation from 0 EFPD to EOC ........................................................ 29 QUADRANT POWER TILT LIMITS AND SETPOINTS ............................................................. 30 POWER PEAKING FACTORS Fig. 9A LOCA Linear Heat Rate Limits for Mark-B-HTP Fuel .......................................... 31 Fig. 9B DNB Power Peaking Factors ............................................................................... 32 REACTOR PROTECTION SYSTEM (RPS) INSTRUMENTATION Fig. 10 RPS Maximum Allowable Setpoints for Axial Power Imbalance ......................... 33 Fig. 11 RPS Variable Low Pressure Temperature Envelope Setpoints .......................... 34 RCS PRESSURE, TEMPERATURE, AND FLOW DNB SURVEILLANCE LIMITS .................. 35 RCS LOOPS MODE 1 AND 2 .................................................................................................... 36 REFUELING BORON CONCENTRATION ................................................................................ 36 ANO-1 4 Revision 0

CYCLE 31 COLR FIGURE 1 Variable Low RCS Pressure - Temperature Protective Limits (Figure is referred to by Technical Specification 2.1.1.3) 2300 3-PUMP 2200 4-PUMP Core Outlet Pressure, psig 2100 2000 1900 1 PUMP EACH LOOP***

1800 1700 590 600 610 620 630 640 650 Reactor Coolant Outlet Temperature, F PUMPS OPERATING (TYPE OF LIMIT) GPM* POWER**

FOUR PUMPS (DNBR LIMIT) 383,680 (100%) 110%

THREE PUMPS (DNBR LIMIT) 284,307 (74.1%) 89%

ONE PUMP IN EACH LOOP (DNBR LIMIT) 188,003 (49%) 62.2%

  • 109% OF DESIGN FLOW (2.5% UNCERTAINTY INCLUDED IN STATISTICAL DESIGN LIMIT)
    • AN ADDITIONAL 2% POWER UNCERTAINTY IS INCLUDED IN STATISTICAL DESIGN LIMIT
      • The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 5 Revision 0

CYCLE 31 COLR Figure 2 AXIAL POWER IMBALANCE Protective Limits (measurement system independent)

(Figure is referred to by Technical Specification 2.1.1 Bases) 120

- 47.4 , 112.0 41.7 , 112.0 ACCEPTABLE 4 PUMP 53.1 , 101.4

-55.2 , 101.4 OPERATION 100

- 47.4 , 87.6 41.7 , 87.6 ACCEPTABLE 80

-55.2 , 77.0 53.1 , 77.0 3 AND 4 PUMP OPERATION

- 47.4 , 61.0 41.7 , 61.0 60 The three - or two -

-55.2 , 50.4 ACCEPTABLE pump example curves 53.1 , 50.4 2, 3 AND 4 show values for an PUMP approximate 26% and 51% flow reduction 40 for three - and two -

pump operation, respectively. The actual setpoint curve will be calculated by the Reactor Protection System and will be 20 directly proportional to the indicated flow.

Themal Power Level, %

-55.2 , 0.0 53.1 , 0.0 0

-70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 Axial Power Imbalance, %

Note:

The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 6 Revision 0

CYCLE 31 COLR SHUTDOWN MARGIN (SDM)

(Limits are referred to by Technical Specifications 3.1.1, 3.1.4, 3.1.5, 3.1.8, 3.1.9, and 3.3.9)

Verify SHUTDOWN MARGIN per the table below.

REQUIRED TECHNICAL APPLICABILITY SHUTDOWN SPECIFICATION MARGIN REFERENCE MODE 1* 1 %k/k 3.1.4, 3.1.5 MODE 2* 1 %k/k 3.1.4, 3.1.5, 3.3.9 MODE 3 1 %k/k 3.1.1, 3.3.9 MODE 4 1 %k/k 3.1.1, 3.3.9 MODE 5 1 %k/k 3.1.1, 3.3.9 MODE 1 PHYSICS TESTS Exceptions** 1 %k/k 3.1.8 MODE 2 PHYSICS TESTS Exceptions 1 %k/k 3.1.9

    • Entry into Mode 1 Physics Tests Exceptions is not supported by existing analyses and as such requires actual shutdown margin to be 1 %k/k.

ANO-1 7 Revision 0

CYCLE 31 COLR Figure 3-A Regulating Rod Insertion Limits for Four-Pump Operation From 0 to 200 +/- 10 EFPD (Figure is referred to by Technical Specification 3.2.1)

  • Operating rod group overlap is 20% +/- 5% between two sequential groups, except for physics tests.

ANO-1 8 Revision 0

CYCLE 31 COLR Figure 3-B Regulating Rod Insertion Limits for Four-Pump Operation From 200 +/- 10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.1)

  • Operating rod group overlap is 20% +/- 5% between two sequential groups, except for physics tests.

ANO-1 9 Revision 0

CYCLE 31 COLR Figure 4-A Regulating Rod Insertion Limits for Three-Pump Operation From 0 to 200 +/- 10 EFPD (Figure is referred to by Technical Specification 3.2.1)

  • Operating rod group overlap is 20% +/- 5% between two sequential groups, except for physics tests.

ANO-1 10 Revision 0

CYCLE 31 COLR Figure 4-B Regulating Rod Insertion Limits for Three-Pump Operation From 200 +/- 10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.1)

  • Operating rod group overlap is 20% +/- 5% between two sequential groups, except for physics tests.

ANO-1 11 Revision 0

CYCLE 31 COLR Figure 5-A Regulating Rod Insertion Limits for Two-Pump Operation From 0 to 200 +/- 10 EFPD (Figure is referred to by Technical Specification 3.2.1) 110.0 100.0 90.0 80.0 70.0 Power, % of 2568 MWt 60.0 OPERATION IN THIS REGION IS NOT ALLOWED (272.5, 52)

(89.9, 52) 50.0 (300.0, 52)

(248.5, 44) 40.0 OPERATION SHUTDOWN (248.5, 38)

RESTRICTED MARGIN 30.0 LIMIT (50.5, 29)

(206.5, 28) 20.0 PERMISSIBLE OPERATING 10.0 REGION (21.5, 10)

(0.0, 6.2) 0.0 0 50 100 150 200 250 300 Rod Index, % Withdrawn 0 20 40 60 80 100 GROUP 7*

0 20 40 60 80 100 GROUP 6*

0 20 40 60 80 100 GROUP 5*

  • The operating rod group overlap is 20% +/- 5% between two sequential groups, except for physics tests.

Note:

1. The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 12 Revision 0

CYCLE 31 COLR Figure 5-B Regulating Rod Insertion Limits for Two-Pump Operation From 200 +/- 10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.1) 110.0 100.0 90.0 80.0 70.0 Power, % of 2568 MWt 60.0 OPERATION IN THIS (189.5, 52) (272.5, 52)

REGION IS NOT 50.0 ALLOWED (300.0, 52)

(248.5, 44) 40.0 (248.5, 38)

OPERATION SHUTDOWN RESTRICTED 30.0 MARGIN (108.5, 29)

LIMIT (206.5, 28) 20.0 PERMISSIBLE OPERATING 10.0 REGION (81.5, 10)

(0.0, 2.6) 0.0 0 50 100 150 200 250 300 Rod Index, % Withdrawn 0 20 40 60 80 100 GROUP 7*

0 20 40 60 80 100 GROUP 6*

0 20 40 60 80 100 GROUP 5*

  • The operating rod group overlap is 20% +/- 5% between two sequential groups, except for physics tests.

Note:

1. The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 13 Revision 0

CYCLE 31 COLR AXIAL POWER SHAPING RODS (APSR) INSERTION LIMITS (Limits referred to by Technical Specification 3.2.2)

Up to 450 +/- 10 EFPD, the APSRs may be positioned as necessary for transient imbalance control; however, the APSRs shall be fully withdrawn by 460 EFPD. After the APSRs withdrawal at 450 +/- 10 EFPD, the APSRs shall not be reinserted, except during the end-of-cycle shutdown when the reactor power is equal to, or less than, 30 % FP.

ANO-1 14 Revision 0

CYCLE 31 COLR Figure 6-A1 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Four-Pump Operation from 0 EFPD to 200 +10/-10 EFPD (Figure is referred to by Technical Specification 3.2.3)

ANO-1 15 Revision 0

CYCLE 31 COLR Figure 6-A2 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Four-Pump Operation from 200 +10/-10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3)

ANO-1 16 Revision 0

CYCLE 31 COLR Figure 6-B1 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions* for Four-Pump Operation from 0 EFPD to 200 +10/-10 EFPD (Figure is referred to by Technical Specification 3.2.3)

  • Assumes that no individual long emitter detector affecting the minimum incore imbalance calculation exceeds 73% sensitivity depletion. The imbalance setpoints for the minimum incore system must be reduced to 2.8% FP at the earliest time-in-life this assumption is no longer valid.

ANO-1 17 Revision 0

CYCLE 31 COLR Figure 6-B2 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions* for Four-Pump Operation from 200 +10/-10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3)

  • Assumes that no individual long emitter detector affecting the minimum incore imbalance calculation exceeds 73% sensitivity depletion. The imbalance setpoints for the minimum incore system must be reduced to 2.8% FP at the earliest time-in-life this assumption is no longer valid.

ANO-1 18 Revision 0

CYCLE 31 COLR Figure 6-C1 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Four-Pump Operation from 0 EFPD to 200 +10/-10 EFPD (Figure is referred to by Technical Specification 3.2.3)

ANO-1 19 Revision 0

CYCLE 31 COLR Figure 6-C2 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Four-Pump Operation from 200 +10/-10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3)

ANO-1 20 Revision 0

CYCLE 31 COLR Figure 7-A1 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Three-Pump Operation from 0 EFPD to 200 +10/-10 EFPD (Figure is referred to by Technical Specification 3.2.3)

ANO-1 21 Revision 0

CYCLE 31 COLR Figure 7-A2 AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Three-Pump Operation from 200 +10/-10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3)

ANO-1 22 Revision 0

CYCLE 31 COLR Figure 7-B1 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions* for Three-Pump Operation from 0 EFPD to 200 +10/-10 EFPD (Figure is referred to by Technical Specification 3.2.3)

  • Assumes that no individual long emitter detector affecting the minimum incore imbalance calculation exceeds 73% sensitivity depletion. The imbalance setpoints for the minimum incore system must be reduced to 2.8% FP at the earliest time-in-life this assumption is no longer valid.

ANO-1 23 Revision 0

CYCLE 31 COLR Figure 7-B2 AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions* for Three-Pump Operation from 200 +10/-10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3)

  • Assumes that no individual long emitter detector affecting the minimum incore imbalance calculation exceeds 73% sensitivity depletion. The imbalance setpoints for the minimum incore system must be reduced to 2.8% FP at the earliest time-in-life this assumption is no longer valid.

ANO-1 24 Revision 0

CYCLE 31 COLR Figure 7-C1 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Three-Pump Operation from 0 EFPD to 200 +10/-10 EFPD (Figure is referred to by Technical Specification 3.2.3)

ANO-1 25 Revision 0

CYCLE 31 COLR Figure 7-C2 AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Three-Pump Operation from 200 +10/-10 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3)

ANO-1 26 Revision 0

CYCLE 31 COLR Figure 8-A AXIAL POWER IMBALANCE Setpoints for Full In-Core Conditions for Two-Pump Operation from 0 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3) 110.0 100.0 90.0 80.0 70.0 60.0

(-28.14, 52) (13.98, 52) 50.0

(-34.51, 46) (25.49, 46)

Power, % of 2568 MWt

(-37.77, 40) 40.0 (32.92, 40)

(-37.88, 30) 30.0 (33.03, 30) 20.0 RESTRICTED PERMISSIBLE RESTRICTED PERMISSIBLE REGION OPERATING REGION OPERATING REGION 10.0 REGION

(-37.88, 0) (33.03, 0) 0.0

-50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 40.00 50.00 Axial Power Imbalance, %FP Note:

The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 27 Revision 0

CYCLE 31 COLR Figure 8-B AXIAL POWER IMBALANCE Setpoints for Minimum In-Core Conditions* for Two-Pump Operation from 0 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3) 110.0 100.0 90.0 80.0 70.0 60.0

(-20.19, 52) (7.66, 52) 50.0

(-25.86, 46) (17.78, 46)

Power, % of 2568 MWt

(-29.00, 40) 40.0 (24.45, 40)

(-29.35, 30) 30.0 (25.15, 30) 20.0 RESTRICTED RESTRICTED PERMISSIBLE PERMISSIBLE REGION REGION OPERATING OPERATING REGION 10.0 REGION

(-29.35, 0) (25.15, 0) 0.0

-50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 40.00 50.00 Axial Power Imbalance, %FP Note:

The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 28 Revision 0

CYCLE 31 COLR Figure 8-C AXIAL POWER IMBALANCE Setpoints for Ex-Core Conditions for Two-Pump Operation from 0 EFPD to EOC (Figure is referred to by Technical Specification 3.2.3) 110.0 100.0 90.0 80.0 70.0 60.0

(-22.78, 52) (9.11, 52) 50.0

(-29.00, 46) (20.28, 46)

Power, % of 2568 MWt

(-32.25, 40) 40.0 (27.54, 40)

(-32.57, 30) 30.0 (27.86, 30) 20.0 RESTRICTED PERMISSIBLE PERMISSIBLE RESTRICTED REGION OPERATING OPERATING REGION REGION 10.0 REGION

(-32.57, 0) (27.86, 0) 0.0

-50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 40.00 50.00 Axial Power Imbalance, %FP Note:

The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 29 Revision 0

CYCLE 31 COLR Quadrant Power Tilt Limits And Setpoints (Limits are referred to by Technical Specification 3.2.4)

From 0 EFPD to EOC Measurement System Steady State Value (%) Maximum Value (%)

60 % FP > 60 % FP Full In-core Detector System Setpoint 6.83 4.38 25.00 Minimum In-core Detector System Setpoint 2.78* 1.90* 25.00 Ex-core Power Range NI Channel Setpoint 4.05 1.96 25.00 Measurement System Independent Limit 7.50 4.92 25.00

  • Assumes that no individual long emitter detector affecting the minimum in-core tilt calculation exceeds 73% sensitivity depletion. The setpoint must be reduced to 1.50% (power levels

> 60% FP) and to 2.19% (power levels 60% FP) at the earliest time-in-life that this assumption is no longer valid.

ANO-1 30 Revision 0

CYCLE 31 COLR Figure 9A LOCA Linear Heat Rate Limits for Mark-B-HTP Fuel (Figure is referred to by Technical Specification 3.1.8 and 3.2.5)

Allowable LOCA LHR Limits LHR Limit for LHR Limit for LHR Limit for Core Elevation, ft 28,000 MWd/mtU, 62,000 MWd/mtU, 0 MWd/mtU, kW/ft kW/ft kW/ft 0.000 16.60 16.60 12.30 2.506 17.50 17.50 13.00 4.264 17.50 17.50 13.00 6.021 17.30 17.30 13.00 7.779 17.50 17.50 13.00 9.536 17.30 17.30 13.00 11.000 15.30 15.30 12.50 12.000 14.50 14.50 12.30 Allowable LOCA LHR Limits - Chrome-Coated Fuel Rods Only LHR Limit for LHR Limit for LHR Limit for Core Elevation, ft 28,000 MWd/mtU, 62,000 MWd/mtU, 0 MWd/mtU, kW/ft kW/ft kW/ft 0.000 15.70 15.70 11.60 2.506 16.60 16.60 12.30 4.264 16.60 16.60 12.30 6.021 16.40 16.40 12.30 7.779 16.60 16.60 12.30 9.536 15.10 15.10 12.30 11.000 12.50 12.50 11.50 12.000 11.80 11.80 10.90 Note:

The LOCA LHR limits may be linearly interpolated as a function of burnup between 0 MWd/mtU and 28,000 MWd/mtU, between 28,000 MWd/mtU and 62,000 MWd/mtU, and as a function of core elevation.

ANO-1 31 Revision 0

CYCLE 31 COLR Figure 9B DNB Power Peaking Factors (Limits are referred to by Technical Specification 3.1.8 and 3.2.5)

The following total power peaking factors define the Maximum Allowable Peaking (MAP) limits to protect the initial conditions assumed in the DNB Loss of Flow transient analysis. The total power peaking factors for IC-DNB 4-pump and 3-pump are identical; hence one set of IC-DNB values are provided for both 4-pump and 3-pump operation.

IC-DNB Total Power Peaking Factors Mark-B-HTP Axial Axial Axial x/L IC MAP Limits x/L IC MAP Limits x/L IC MAP Limits Peak Peak Peak 0.01 2.04426 0.01 2.94000 0.01 3.20469 0.14 2.04515 0.14 2.94000 0.14 3.20469 0.20 2.04535 0.20 2.93545 0.20 3.15423 0.30 2.04551 0.30 2.84715 0.30 3.08083 0.40 2.04470 0.40 2.76077 0.40 2.98064 1.1 0.50 2.04437 1.4 0.50 2.66671 1.7 0.50 2.89369 0.60 2.04415 0.60 2.55808 0.60 2.78037 0.70 2.04400 0.70 2.46508 0.70 2.68552 0.80 2.04329 0.80 2.34973 0.80 2.56207 0.89 2.00109 0.89 2.27714 0.89 2.49021 0.99 1.90427 0.99 2.18525 0.99 2.39515 0.01 2.33088 0.01 3.08066 0.01 3.24949 0.14 2.33287 0.14 3.08066 0.14 3.24949 0.20 2.33339 0.20 3.03513 0.20 3.20303 0.30 2.33352 0.30 2.93856 0.30 3.13047 0.40 2.33338 0.40 2.84115 0.40 3.04037 1.2 0.50 2.33285 1.5 0.50 2.75216 1.8 0.50 2.95027 0.60 2.33232 0.60 2.63946 0.60 2.84225 0.70 2.26721 0.70 2.54429 0.70 2.74696 0.80 2.16931 0.80 2.42655 0.80 2.62489 0.89 2.10460 0.89 2.35382 0.89 2.55373 0.99 2.00767 0.99 2.26040 0.99 2.45882 0.01 2.64464 0.01 3.14861 0.01 3.28611 0.14 2.64863 0.14 3.14861 0.14 3.28611 0.20 2.64909 0.20 3.09918 0.20 3.24461 0.30 2.64997 0.30 3.01573 0.30 3.17163 0.40 2.64949 0.40 2.91490 0.40 3.08589 1.3 0.50 2.56272 1.6 0.50 2.82718 1.9 0.50 3.00025 0.60 2.46600 0.60 2.71210 0.60 2.89826 0.70 2.37484 0.70 2.61653 0.70 2.80288 0.80 2.26452 0.80 2.49634 0.80 2.68386 0.89 2.19471 0.89 2.42370 0.89 2.61261 0.99 2.09988 0.99 2.32955 0.99 2.51792 Notes

1. The values above are not error corrected.
2. The values above were generated using SCD methods which incorporate a 3.8% radial peak uncertainty in the DNBR design limit. Therefore, the above IC MAP limits can be compared to predicted peaks without the addition of up to 3.8% in radial peak calculation uncertainty. These limits, however, do not incorporate any grid bias uncertainty.
3. The present T-H methodology allows for an increase in the design radial-local peak for power levels below 100% full power.

The equations defining the multipliers are as follows:

P/Pm = 1.00 P/Pm < 1.00 MAP Multiplier 1.0 1 + 0.3(1 - P/Pm)

Where P = core power fraction, and Pm = 1.00 for 4-pump operation, or

= 0.75 for 3-pump operation ANO-1 32 Revision 0

CYCLE 31 COLR Figure 10 Reactor Protection System Maximum Allowable Setpoints for Axial Power Imbalance (Figure is referred to by Technical Specification 3.3.1 and Technical Specification Bases 2.1.1) 120

- 34.0 , 107.0 27.4 , 107.0 ACCEPTABLE 100 4 PUMP

- 44.0 , 92.5 42.0 , 92.5

- 34.0 , 79.3 27.4 , 79.3 80 ACCEPTABLE 3 AND 4 PUMP

- 44.0 , 64.8 42.0 , 64.8 60

- 34.0 , 52.4 27.4 , 52.4 ACCEPTABLE The three - or two -

2, 3 AND 4 pump example setpoint curves PUMP show allowable

- 44.0 , 37.9 40 values for an 42.0 , 37.9 approximate 26%

and 51% flow reduction for three - and two -

pump operation, respectively. The actual setpoint curve will be 20 calculated by the Reactor Protection System and will be directly proportional to the Themal Power Level, %

indicated flow.

- 44.0 , 0.0 42.0 , 0.0 0

-70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 Axial Power Imbalance, %

Flux / Flow Setpoint

(% Power / % Flow)

Four Pump Operation 1.07 Three Pump Operation 1.07 Two Pump Operation 1.07 Note:

The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 33 Revision 0

CYCLE 31 COLR Figure 11 Reactor Protection System Variable Low Pressure Temperature Envelope Setpoints (Figure is referred to by Technical Specification 3.3.1) 2400 618, 2355 560, 2355 2200 Reactor Coolant Pressure, psig ACCEPTABLE OPERATION 2000 618, 1980 P = 16.25 Tout - 8063, psig UNACCEPTABLE OPERATION 1800 560, 1800 606.9, 1800 1600 560 580 600 620 640 660 Reactor Outlet Temperature, F ANO-1 34 Revision 0

CYCLE 31 COLR RCS Pressure, Temperature, and Flow DNB Surveillance Limits (Limit is referred to by Technical Specification 3.4.1)

Four-Pump Three-Pump Two-Pump Operation Operation Operation Note 10 2081.2Note 4 Minimum RCS Hot Leg Pressure (psig) Note 1 2082.2 2118.1 2120.4Note 5 Maximum RCS Hot Leg Temperature (°F) Note 2 602.6 602.9 603.15 143.36 Note 6 106.46 Note 7 70.64 Note 8 Minimum RCS Total Flow (Mlbm/hr) Note 3 138.01 Note 9 102.45 Note 9 67.96 Note 9 Note 1 -- Using individual indications P1021, P1023, P1038 and P1039 (or equivalent) from the plant computer.

Note 2 -- Using individual indications T1011NR, T1014NR, T1039NR, T1042NR, T1012, T1013, T1040 and T1041 or averages TOUTA, XTOUTA, TOUTB, XTOUTB, TOUT, XTOUT from the plant computer.

Note 3 -- Using indication WRCFT (or equivalent) from the plant computer, and can be linearly interpolated between these values provided the Tave versus Power level curve is followed.

Note 4 -- Applies to the RCS loop with two RCPs operating.

Note 5 -- Applies to the RCS loop with one RCP operating.

Note 6 -- For Tcold = 556.57 °F.

Note 7 -- For Tcold = 556.3 °F.

Note 8 -- For Tcold = 556.1 °F.

Note 9 -- For Tcold = 580 °F.

Note 10 -- The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31.

ANO-1 35 Revision 0

CYCLE 31 COLR RCS Loops - Mode 1 and Mode 2 (Limit is referred to by Technical Specification 3.4.4)

Nominal Operating Power Level

(% Power)

Four Pump Operation 100 Three Pump Operation 75 Two Pump Operation* 49 Notes:

1. Technical Specification 3.4.4 does not allow indefinite operation in Modes 1 and 2 with only two pumps operating.
2. The Operable-Comp Measure, documented CR-ANO-1-2021-00503 for Cycle 30, restricts Two-Pump operation to 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> in Modes 1 and 2. This Operable-Comp Measure will be continued for Cycle 31 Refueling Boron Concentration (Limit is referred to by Technical Specification 3.9.1)

The minimum required boron concentration (which includes uncertainties) for use during refueling is 2162 ppm Boron.

ANO-1 36 Revision 0

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