ML22070A140

Core Operating Limits Report for Cycle 21 Operation, Revision 0

ML22070A140
Person / Time
Site:	Browns Ferry
Issue date:	03/11/2022
From:	Rasmussen M Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML22070A140 (46)

Text

Post Office Box 2000, Decatur, Alabama 35609-2000 March 11, 2022 10 CFR 50.4 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 Browns Ferry Nuclear Plant, Unit 3 Facility Operating License No. DPR-68 NRC Docket No. 50-296

Subject:

Browns Ferry Nuclear Plant, Unit 3 Core Operating Limits Report for Cycle 21 Operation, Revision 0 In accordance with the requirements of Technical Specification (TS) 5.6.5.d, the Tennessee Valley Authority is submitting the Browns Ferry Nuclear Plant (BFN), Unit 3, Cycle 21, Core Operating Limits Report (COLR). Revision 0 of the Unit 3 COLR includes all Modes of operation (Modes 1 through 5).

There are no new regulatory commitments in this letter. If you have any questions, please contact C. L. Vaughn, Nuclear Site Licensing Manager, at (256) 729-2636.

Respectfully, Matthew Rasmussen Site Vice President

Enclosure:

Core Operating Limits Report, (120% OLTP, MELLLA+), for Cycle 21 Operation, TVA-COLR-BF3C21, Revision 0 cc: (w/ Enclosure)

NRC Regional Administrator - Region II NRC Senior Resident Inspector - Browns Ferry Nuclear Plant NRC Project Manager - Browns Ferry Nuclear Plant

Enclosure Tennessee Valley Authority Browns Ferry Nuclear Plant Unit 3 Core Operating Limits Report, (120% OLTP, MELLLA+), for Unit 3 Cycle 21 Operation, TVA-COLR-BF3C21, Revision 0 (See Attached)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table of Contents Total Number of Pages = 44 (including review cover sheet)

List of Tables.................................................................................................................................iii List of Figures .............................................................................................................................. iv Revision Log ................................................................................................................................. v Nomenclature ............................................................................................................................... vi References .................................................................................................................................. viii 1 Introduction .......................................................................................................................... 1 1.1 Purpose ......................................................................................................................... 1 1.2 Scope ............................................................................................................................ 1 1.3 Fuel Loading.................................................................................................................. 1 1.4 Acceptability .................................................................................................................. 2 2 APLHGR Limits .................................................................................................................... 3 2.1 Rated Power and Flow Limit: APLHGRRATED ................................................................ 3 2.2 Off-Rated Power Dependent Limit: APLHGRP ............................................................. 3 2.2.1 Startup without Feedwater Heaters ....................................................................... 3 2.3 Off-Rated Flow Dependent Limit: APLHGRF ................................................................ 3 2.4 Single Loop Operation Limit: APLHGRSLO.................................................................... 3 2.5 Equipment Out-Of-Service Corrections ......................................................................... 5 3 LHGR Limits ......................................................................................................................... 6 3.1 Rated Power and Flow Limit: LHGRRATED..................................................................... 6 3.2 Off-Rated Power Dependent Limit: LHGRP .................................................................. 6 3.2.1 Startup without Feedwater Heaters ....................................................................... 6 3.3 Off-Rated Flow Dependent Limit: LHGRF..................................................................... 7 3.4 Equipment Out-Of-Service Corrections ......................................................................... 7 4 OLMCPR Limits ................................................................................................................. 13 4.1 Flow Dependent MCPR Limit: MCPRF ....................................................................... 13 4.2 Power Dependent MCPR Limit: MCPRP .................................................................... 13 4.2.1 Startup without Feedwater Heaters ..................................................................... 13 4.2.2 Scram Speed Dependent Limits (TSSS vs. NSS vs. OSS) ................................. 14 4.2.3 Exposure Dependent Limits ................................................................................ 14 4.2.4 Equipment Out-Of-Service (EOOS) Options ....................................................... 15 4.2.5 Single-Loop-Operation (SLO) Limits ................................................................... 15 4.2.6 Below PBypass Limits ............................................................................................. 15 5 Thermal-Hydraulic Stability Protection ............................................................................... 27 6 APRM Flow Biased Rod Block Trip Settings ...................................................................... 29 7 Rod Block Monitor (RBM) Trip Setpoints and Operability .................................................. 30 8 Shutdown Margin Limit ....................................................................................................... 32 Appendix A: MBSP Maps ...................................................................................................... A-1 Browns Ferry Unit 3 Cycle 21 Page ii Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 List of Tables Nuclear Fuel Types0F0F0F ................................................................................................................. 2 Startup Feedwater Temperature Basis ......................................................................................... 6 Nominal Scram Time Basis ......................................................................................................... 14 MCPRP Limits for All Fuel Types: Optimum Scram Time Basis7F7F7F ............................................ 17 MCPRP Limits for All Fuel Types: Nominal Scram Time Basis8F8F8F .............................................. 18 MCPRP Limits for All Fuel Types: Technical Specification Scram Time Basis10F10F10F ...................... 20 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 1 for All Fuel Types:

Nominal Scram Time Basis12F12F12F ................................................................................................... 22 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 2 for All Fuel Types:

Nominal Scram Time Basis13F13F13F ................................................................................................... 23 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 1 for All Fuel Types:

Technical Specification Scram Time Basis14F14F14F............................................................................ 24 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 2 for All Fuel Types:

Technical Specification Scram Time Basis15F15F15F............................................................................ 25 MCPRP Limits for All Fuel Types: Single Loop Operation for All Scram Times16F16F16F .................... 26 ABSP Setpoints for the Scram Region ....................................................................................... 27 Analyzed MBSP Endpoints: Nominal Feedwater Temperature ................................................. 28 Analyzed MBSP Endpoints: Reduced Feedwater Temperature ................................................ 28 Analytical RBM Trip Setpoints18F18F17F ............................................................................................... 30 RBM Setpoint Applicability .......................................................................................................... 30 Control Rod Withdrawal Error Results ........................................................................................ 31 Browns Ferry Unit 3 Cycle 21 Page iii Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 List of Figures APLHGRRATED for ATRIUM-10XM Fuel ......................................................................................... 4 LHGRRATED for ATRIUM-10XM Fuel .............................................................................................. 8 Base Operation LHGRFACP for ATRIUM-10XM Fuel ................................................................... 9 LHGRFACF for ATRIUM-10XM Fuel ........................................................................................... 10 Startup Operation LHGRFACP for ATRIUM-10XM Fuel: Table 3.1 Temperature Range 1 ........ 11 Startup Operation LHGRFACP for ATRIUM-10XM Fuel: Table 3.1 Temperature Range 2 ........ 12 MCPRF for All Fuel Types ........................................................................................................... 16 MBSP Boundaries For Nominal Feedwater Temperature ........................................................ A-2 MBSP Boundaries For Reduced Feedwater Temperature ....................................................... A-3 Browns Ferry Unit 3 Cycle 21 Page iv Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Revision Log Number Page Description 0-R0 All New document.

Browns Ferry Unit 3 Cycle 21 Page v Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Nomenclature ABSP Automatic Backup Stability Protection APLHGR Average Planar LHGR APRM Average Power Range Monitor AREVA NP Vendor (Framatome, Siemens)

BOC Beginning of Cycle BSP Backup Stability Protection BWR Boiling Water Reactor CAVEX Core Average Exposure CD Coast Down CMSS Core Monitoring System Software COLR Core Operating Limits Report CPR Critical Power Ratio CRWE Control Rod Withdrawal Error CSDM Cold SDM DIVOM Delta CPR over Initial CPR vs. Oscillation Magnitude DSS-CD Detect and Suppress Solution - Confirmation Density EOC End of Cycle EOCLB End-of-Cycle Licensing Basis EOOS Equipment OOS EPU Extended Power Uprate (120% OLTP)

FFTR Final Feedwater Temperature Reduction FFWTR Final Feedwater Temperature Reduction FHOOS Feedwater Heaters OOS ft Foot: English unit of measure for length GNF Vendor (General Electric, Global Nuclear Fuels)

GWd Giga Watt Day HTSP High TSP ICA Interim Corrective Action ICF Increased Core Flow (beyond rated)

IS In-Service kW kilo watt: SI unit of measure for power.

LCO License Condition of Operation LFWH Loss of Feedwater Heating LHGRFAC LHGR Multiplier (Power or Flow dependent)

LPRM Low Power Range Monitor LRNB Generator Load Reject, No Bypass MAPFAC MAPLHGR multiplier (Power or Flow dependent)

Browns Ferry Unit 3 Cycle 21 Page vi Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 MBSP Manual Backup Stability Protection MCPR Minimum CPR MELLLA Maximum Extended Load Line Limit Analysis MELLLA+ Maximum Extended Load Line Limit Analysis Plus MSRV Moisture Separator Reheater Valve MSRVOOS MSRV OOS MTU Metric Ton Uranium MWd/MTU Mega Watt Day per Metric Ton Uranium NEOC Near EOC NRC United States Nuclear Regulatory Commission NSS Nominal Scram Speed NTSP Nominal TSP OLMCPR MCPR Operating Limit OLTP Original Licensed Thermal Power OOS Out-Of-Service OPRM Oscillation Power Range Monitor OSS Optimum Scram Speed PBDA Period Based Detection Algorithm Pbypass Power, below which TSV Position and TCV Fast Closure Scrams are Bypassed PLU Power Load Unbalance PLUOOS PLU OOS PRNM Power Range Neutron Monitor RBM Rod Block Monitor RCPOOS Recirculation Pump OOS (SLO)

RDF Rated Drive Flow RPS Reactor Protection System RPT Recirculation Pump Trip RPTOOS RPT OOS RTP Rated Thermal Power SDM Shutdown Margin SLMCPR MCPR Safety Limit SLO Single Loop Operation TBV Turbine Bypass Valve TBVIS TBV IS TBVOOS Turbine Bypass Valves OOS TIP Transversing In-core Probe TIPOOS TIP OOS TLO Two Loop Operation TSP Trip Setpoint TSSS Technical Specification Scram Speed TVA Tennessee Valley Authority Browns Ferry Unit 3 Cycle 21 Page vii Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 References

1. ANP-3970, Revision 0, Browns Ferry Unit 3 Cycle 21 Reload Analysis, Framatome Inc., December 2021.

2. Not Used.

3. ANP-3150P, Revision 4, Mechanical Design Report for Browns Ferry ATRIUM 10XM Fuel Assemblies, AREVA Inc., November 2017.

4. ANP-3793P, Revision 0, Browns Ferry Unit 3 Cycle 21 Plant Parameters Document, Framatome Inc., June 2021.

5. BFE-4659, Revision 0, Browns Ferry Unit 3 Cycle 21 In-Core Shuffle, Tennessee Valley Authority, January 2022.

Methodology References

6. XN-NF-81-58(P)(A) Revision 2 and Supplements 1 and 2, RODEX2 Fuel Rod Thermal-Mechanical Response Evaluation Model, Exxon Nuclear Company, March 1984.

7. XN-NF-85-67(P)(A) Revision 1, Generic Mechanical Design for Exxon Nuclear Jet Pump BWR Reload Fuel, Exxon Nuclear Company, September 1986.

8. EMF-85-74(P) Revision 0 Supplement 1(P)(A) and Supplement 2(P)(A), RODEX2A (BWR) Fuel Rod Thermal-Mechanical Evaluation Model, Siemens Power Corporation, February 1998.

9. ANF-89-98(P)(A) Revision 1 and Supplement 1, Generic Mechanical Design Criteria for BWR Fuel Designs, Advanced Nuclear Fuels Corporation, May 1995.

10. XN-NF-80-19(P)(A) Volume 1 and Supplements 1 and 2, Exxon Nuclear Methodology for Boiling Water Reactors - Neutronic Methods for Design and Analysis, Exxon Nuclear Company, March 1983.

11. XN-NF-80-19(P)(A) Volume 4 Revision 1, Exxon Nuclear Methodology for Boiling Water Reactors: Application of the ENC Methodology to BWR Reloads, Exxon Nuclear Company, June 1986.

12. EMF-2158(P)(A) Revision 0, Siemens Power Corporation Methodology for Boiling Water Reactors: Evaluation and Validation of CASMO-4/MICROBURN-B2, Siemens Power Corporation, October 1999.

13. XN-NF-80-19(P)(A) Volume 3 Revision 2, Exxon Nuclear Methodology for Boiling Water Reactors, THERMEX: Thermal Limits Methodology Summary Description, Exxon Nuclear Company, January 1987.

14. XN-NF-84-105(P)(A) Volume 1 and Volume 1 Supplements 1 and 2, XCOBRA-T: A Computer Code for BWR Transient Thermal-Hydraulic Core Analysis, Exxon Nuclear Company, February 1987.

15. ANP-10307PA, Revision 0, AREVA MCPR Safety Limit Methodology for Boiling Water Reactors, AREVA NP Inc., June 2011.

Browns Ferry Unit 3 Cycle 21 Page viii Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402

16. ANF-913(P)(A) Volume 1 Revision 1 and Volume 1 Supplements 2, 3 and 4, COTRANSA2: A Computer Program for Boiling Water Reactor Transient Analyses, Advanced Nuclear Fuels Corporation, August 1990.

17. ANF-1358(P)(A) Revision 3, The Loss of Feedwater Heating Transient in Boiling Water Reactors, Advanced Nuclear Fuels Corporation, September 2005.

18. EMF-2209(P)(A) Revision 3, SPCB Critical Power Correlation, AREVA NP Inc.,

September 2009.

19. EMF-2361(P)(A) Revision 0, EXEM BWR-2000 ECCS Evaluation Model, Framatome ANP Inc., May 2001, as supplemented by the site specific approval in NRC safety evaluations dated February 15, 2013 and July 31, 2014.

20. EMF-2292(P)(A) Revision 0, ATRIUM'-10: Appendix K Spray Heat Transfer Coefficients, Siemens Power Corporation, September 2000.

21. EMF-CC-074(P)(A), Volume 4, Revision 0, BWR Stability Analysis: Assessment of STAIF with Input from MICROBURN-B2, Siemens Power Corporation, August 2000.

22. BAW-10255(P)(A), Revision 2, Cycle-Specific DIVOM Methodology Using the RAMONA5-FA Code, AREVA NP Inc., May 2008.

23. BAW-10247PA, Revision 0, Realistic Thermal-Mechanical Fuel Rod Methodology for Boiling Water Reactors, AREVA NP Inc., April 2008.

24. ANP-10298PA, Revision 0, ACE/ATRIUM 10XM Critical Power Correlation, AREVA NP Inc., March 2010.

25. ANP-3140(P), Revision 0, Browns Ferry Units 1, 2, and 3 Improved K-factor Model for ACE/ATRIUM 10XM Critical Power Correlation, AREVA NP Inc.,

August 2012.

26. NEDC-33075P-A, Revision 8, GE Hitachi Boiling Water Reactor Detect and Suppress Solution - Confirmation Density, GE Hitachi, November 2013.

Setpoint References

27. EDQ2092900118, R37, Setpoint and Scaling Calculation for Neutron Monitoring &

Recirculation Flow Loops, Calculation File, Tennessee Valley Authority, December 2020.

28. Task T0500, Revision 0, Neutron Monitoring System w/RBM, Project Task Report, GE Hitachi Nuclear Energy, June 2017.

29. Task T0506, Revision 0, TS Instrument Setpoints, Project Task Report, Tennessee Valley Authority, August, 2017.

30. NEDC-33006P-A, Revision 3, General Electric Boiling Water Reactor Maximum Extended Load Line Limit Analysis Plus, GE Energy Nuclear, June 2009.

Browns Ferry Unit 3 Cycle 21 Page ix Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 1 Introduction In anticipation of cycle startup, it is necessary to describe the expected limits of operation.

1.1 Purpose The primary purpose of this document is to satisfy requirements identified by unit technical specification section 5.6.5. This document may be provided, upon final approval, to the NRC.

1.2 Scope This document will discuss the following areas:

Average Planar Linear Heat Generation Rate (APLHGR) Limit (Technical Specifications 3.2.1 and 3.7.5)

Applicability: Mode 1, 23% RTP (Technical Specifications definition of RTP)

Linear Heat Generation Rate (LHGR) Limit (Technical Specification 3.2.3, 3.3.4.1, and 3.7.5)

Applicability: Mode 1, 23% RTP (Technical Specifications definition of RTP)

Minimum Critical Power Ratio Operating Limit (OLMCPR)

(Technical Specifications 3.2.2, 3.3.4.1, 3.7.5 and Table 3.3.2.1-1)

Applicability: Mode 1, 23% RTP (Technical Specifications definition of RTP)

Thermal-Hydraulic Stability Protection (Technical Specification Table 3.3.1.1)

Applicability: Mode 1, (as specified in Technical Specifications Table 3.3.1.1-1)

Average Power Range Monitor (APRM) Flow Biased Rod Block Trip Setting (Technical Requirements Manual Section 5.3.1 and Table 3.3.4-1)

Applicability: Mode 1, (as specified in Technical Requirements Manuals Table 3.3.4-1)

Rod Block Monitor (RBM) Trip Setpoints and Operability (Technical Specification Table 3.3.2.1-1)

Applicability: Mode 1,  % RTP as specified in Table 3.3.2.1-1 (TS definition of RTP)

Shutdown Margin (SDM) Limit (Technical Specification 3.1.1)

Applicability: All Modes 1.3 Fuel Loading The core will contain fresh, and previously exposed ATRIUM-10XM. Nuclear fuel types used in the core loading are shown in Table 1.1. The core shuffle and final loading were explicitly evaluated for BOC cold shutdown margin performance as documented per Reference 5.

Browns Ferry Unit 3 Cycle 21 Page 1 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 1.1 Nuclear Fuel Types

• 0F0F0F Nuclear Original Number of Fuel Type Fuel Names Fuel Description Cycle Assemblies (NFT) (Range)

ATRIUM 10XM XMLC-3911B-13GV80-FCH 19 45 22 FCH001-FCH240 ATRIUM 10XM XMLC-4053B-12GV80-FCH 19 75 23 FCH241-FCH344 ATRIUM 10XM XMLC-3920B-14GV80-FCJ 20 224 24 FCJ345-FCJ568 ATRIUM 10XM XMLC-3957B-12GV80-FCJ 20 88 25 FCJ569-FCJ656 ATRIUM 10XM XMLC-4000B-15GV80-FCK 21 144 26 FCK667-FCK810 ATRIUM 10XM XMLC-4001B-14GV80-FCK 21 100 27 FCK811-FCK910 ATRIUM 10XM XMLC-3986B-14GV80-FCK 21 24 28 FCK911-FCK934 ATRIUM 10XM XMLC-3992B-12GV80-FCK 21 64 29 FCK935-FCK998 1.4 Acceptability Limits discussed in this document were generated based on NRC approved methodologies per References 6 through 26.

• The table identifies the expected fuel type breakdown in anticipation of final core loading. The final composition of the core depends upon uncertainties during the outage such as discovering a failed fuel bundle, or other bundle damage. Minor core loading changes, due to unforeseen events, will conform to the safety and monitoring requirements identified in this document.

Browns Ferry Unit 3 Cycle 21 Page 2 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 2 APLHGR Limits (Technical Specifications 3.2.1 & 3.7.5)

The APLHGR limit is determined by adjusting the rated power APLHGR limit for off-rated power, off-rated flow, and SLO conditions. The most limiting of these is then used as follows:

APLHGR limit = MIN ( APLHGRP , APLHGRF, APLHGRSLO )

where:

APLHGRP off-rated power APLHGR limit [APLHGRRATED

• MAPFACP]

APLHGRF off-rated flow APLHGR limit [APLHGRRATED

• MAPFACF]

APLHGRSLO SLO APLHGR limit [APLHGRRATED

• SLO Multiplier]

2.1 Rated Power and Flow Limit: APLHGRRATED The rated conditions APLHGR for all fuel are identified per Reference 1. The rated conditions APLHGR for ATRIUM-10XM are shown in Figure 2.1.

2.2 Off-Rated Power Dependent Limit: APLHGRP Reference 1 does not specify a power dependent APLHGR. Therefore, MAPFACP is set to a value of 1.0.

2.2.1 Startup without Feedwater Heaters There is a range of operation during startup when the feedwater heaters are not placed into service until after the unit has reached a significant operating power level. No additional power dependent limitation is required.

2.3 Off-Rated Flow Dependent Limit: APLHGRF Reference 1 does not specify a flow dependent APLHGR. Therefore, MAPFACF is set to a value of 1.0.

2.4 Single Loop Operation Limit: APLHGRSLO The single loop operation multiplier for ATRIUM-10XM fuel is 0.85, per Reference 1.

Browns Ferry Unit 3 Cycle 21 Page 3 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 15 12 APLHGR (kW/ft) 9 6

3 0

0 20 40 60 80 Planar Average Exposure (GWd/MTU)

Planar Avg. APLHGR Exposure Limit (GWd/MTU) (kW/ft) 0.0 13.0 15.0 13.0 67.0 7.6 Figure 2.1 APLHGRRATED for ATRIUM-10XM Fuel Browns Ferry Unit 3 Cycle 21 Page 4 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 2.5 Equipment Out-Of-Service Corrections The limits shown in Figure 2.1 are applicable for operation with all equipment In-Service as well as the following Equipment Out-Of-Service (EOOS) options; including combinations of the options.

In-Service All equipment In-Service

• 1F1F1F RPTOOS EOC-Recirculation Pump Trip Out-Of-Service TBVOOS Turbine Bypass Valve(s) Out-Of-Service PLUOOS Power Load Unbalance Out-Of-Service FHOOS (or FFWTR) Feedwater Heaters Out-Of-Service or Final Feedwater Temperature Reduction RCPOOS One Recirculation Pump Out-Of-Service

• All equipment service conditions assume 1 SRVOOS.

Browns Ferry Unit 3 Cycle 21 Page 5 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 3 LHGR Limits (Technical Specification 3.2.3, 3.3.4.1, & 3.7.5)

The LHGR limit is determined by adjusting the rated power LHGR limit for off-rated power and off-rated flow conditions. The most limiting of these is then used as follows:

LHGR limit = MIN ( LHGRP, LHGRF )

where:

LHGRP off-rated power LHGR limit [LHGRRATED

• LHGRFACP]

LHGRF off-rated flow LHGR limit [LHGRRATED

• LHGRFACF]

3.1 Rated Power and Flow Limit: LHGRRATED The rated conditions LHGR for all fuel are identified per Reference 1. The rated conditions LHGR for ATRIUM-10XM fuel is shown in Figure 3.1. The LHGR limit is consistent with Reference 3.

3.2 Off-Rated Power Dependent Limit: LHGRP LHGR limits are adjusted for off-rated power conditions using the LHGRFACP multiplier provided in Reference 1. The multiplier is split into two sub cases: turbine bypass valves in and out-of-service. The base case multipliers are shown in Figure 3.2.

3.2.1 Startup without Feedwater Heaters There is a range of operation during startup when the feedwater heaters are not placed into service until after the unit has reached a significant operating power level. Additional limits are shown in Figure 3.4 and Figure 3.5, based on temperature conditions identified in Table 3.1.

Table 3.1 Startup Feedwater Temperature Basis Temperature Power Range 1 Range 2

(% Rated) (°F) (°F) 23 160.0 155.0 30 167.0 162.0 40 177.0 172.0 50 187.0 182.0 Browns Ferry Unit 3 Cycle 21 Page 6 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 3.3 Off-Rated Flow Dependent Limit: LHGRF LHGR limits are adjusted for off-rated flow conditions using the LHGRFACF multiplier provided in Reference 1. Multipliers are shown in Figure 3.3.

3.4 Equipment Out-Of-Service Corrections The limits shown in Figure 3.1 are applicable for operation with all equipment In-Service as well as the following Equipment Out-Of-Service (EOOS) options; including combinations of the options.

• 2F2F2F In-Service All equipment In-Service RPTOOS EOC-Recirculation Pump Trip Out-Of-Service TBVOOS Turbine Bypass Valve(s) Out-Of-Service PLUOOS Power Load Unbalance Out-Of-Service FHOOS (or FFWTR) Feedwater Heaters Out-Of-Service or Final Feedwater Temperature Reduction RCPOOS One Recirculation Pump Out-Of-Service Off-rated power corrections shown in Figure 3.2 are dependent on operation of the Turbine Bypass Valve system. For this reason, separate limits are to be applied for TBVIS or TBVOOS operation. The limits have no dependency on RPTOOS, PLUOOS, FHOOS/FFWTR, or SLO.

Off-rated flow corrections shown in Figure 3.3 are bounding for all EOOS conditions.

Off-rated power corrections shown in Figure 3.4 and Figure 3.5 are also dependent on operation of the Turbine Bypass Valve system. In this case, limits support FHOOS operation during startup. These limits have no dependency on RPTOOS, PLUOOS, or SLO.

• All equipment service conditions assume 1 SRVOOS.

Browns Ferry Unit 3 Cycle 21 Page 7 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 15 12 9

LHGR (kW/ft) 6 3

0 0 20 40 60 80 Pellet Exposure (GWd/MTU)

Pellet LHGR Exposure Limit (GWd/MTU) (kW/ft) 0.0 14.1 18.9 14.1 74.4 7.4 Figure 3.1 LHGRRATED for ATRIUM-10XM Fuel Browns Ferry Unit 3 Cycle 21 Page 8 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 1.10 1.00 0.90 Turbine Bypass Valve In-Service, TBVIS 0.80 Turbine Bypass Valve Out-of-Service, TBVOOS LHGRFACP 0.70 0.60 0.50 TBVIS, 50% Core Flow TBVOOS, 50% Core Flow TBVIS, > 50% Core Flow 0.40 TBVOOS, > 50% Core Flow 0.30 0.20 20 30 40 50 60 70 80 90 100 110 Core Power (% Rated)

Turbine Bypass In-Service Turbine Bypass Out-of-Service Core Core Power LHGRFACP Power LHGRFACP

(% Rated) (% Rated) 100.0 1.00 100.0 1.00 26.0 0.64 26.0 0.61 Core Flow > 50% Rated Core Flow > 50% Rated 26.0 0.45 26.0 0.38 23.0 0.41 23.0 0.35 Core Flow 50% Rated Core Flow 50% Rated 26.0 0.49 26.0 0.49 23.0 0.47 23.0 0.42 Figure 3.2 Base Operation LHGRFACP for ATRIUM-10XM Fuel (Independent of other EOOS conditions)

Browns Ferry Unit 3 Cycle 21 Page 9 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 1.10 1.05 1.00 0.95 0.90 LHGRFACF 0.85 0.80 0.75 0.70 0.65 0.60 0.55 20 30 40 50 60 70 80 90 100 110 Core Flow (% Rated)

Core Flow LHGRFACF

(% Rated) 0.0 0.62 30.0 0.62 75.3 1.00 107.0 1.00 Figure 3.3 LHGRFACF for ATRIUM-10XM Fuel (Values bound all EOOS conditions)

(107.0% maximum core flow line is used to support 105% rated flow operation, ICF)

Browns Ferry Unit 3 Cycle 21 Page 10 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 1.10 1.00 0.90 0.80 Turbine Bypass Valve In-Service, TBVIS Turbine Bypass Valve Out-of-Service, TBVOOS LHGRFACP 0.70 0.60 0.50 TBVIS, 50% Core Flow TBVIS, > 50% Core Flow 0.40 TBVOOS, 50% Core Flow TBVOOS, > 50% Core Flow 0.30 0.20 20 30 40 50 60 70 80 90 100 110 Core Power (% Rated)

Turbine Bypass In-Service Turbine Bypass Out-of-Service Core Core Power LHGRFACP Power LHGRFACP

(% Rated) (% Rated) 100.0 1.00 100.0 1.00 26.0 0.52 26.0 0.51 Core Flow > 50% Rated Core Flow > 50% Rated 26.0 0.42 26.0 0.34 23.0 0.38 23.0 0.32 Core Flow 50% Rated Core Flow 50% Rated 26.0 0.46 26.0 0.40 23.0 0.43 23.0 0.39 Figure 3.4 Startup Operation LHGRFACP for ATRIUM-10XM Fuel:

Table 3.1 Temperature Range 1 (no Feedwater heating during startup)

(Limits valid at and below 50% power)

Browns Ferry Unit 3 Cycle 21 Page 11 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 1.10 1.00 0.90 0.80 Turbine Bypass Valve In-Service, TBVIS Turbine Bypass Valve Out-of-Service, TBVOOS LHGRFACP 0.70 0.60 0.50 TBVIS, 50% Core Flow TBVIS, > 50% Core Flow 0.40 TBVOOS, 50% Core Flow TBVOOS, > 50% Core Flow 0.30 0.20 20 30 40 50 60 70 80 90 100 110 Core Power (% Rated)

Turbine Bypass In-Service Turbine Bypass Out-of-Service Core Core Power LHGRFACP Power LHGRFACP

(% Rated) (% Rated) 100.0 1.00 100.0 1.00 26.0 0.52 26.0 0.51 Core Flow > 50% Rated Core Flow > 50% Rated 26.0 0.41 26.0 0.34 23.0 0.37 23.0 0.32 Core Flow 50% Rated Core Flow 50% Rated 26.0 0.46 26.0 0.40 23.0 0.42 23.0 0.39 Figure 3.5 Startup Operation LHGRFACP for ATRIUM-10XM Fuel:

Table 3.1 Temperature Range 2 (no Feedwater heating during startup)

(Limits valid at and below 50% power)

Browns Ferry Unit 3 Cycle 21 Page 12 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 4 OLMCPR Limits (Technical Specification 3.2.2, 3.3.4.1, & 3.7.5)

OLMCPR is calculated to be the most limiting of the flow or power dependent values OLMCPR limit = MAX ( MCPRF , MCPRP )

where:

MCPRF core flow-dependent MCPR limit MCPRP power-dependent MCPR limit 4.1 Flow Dependent MCPR Limit: MCPRF MCPRF limits are dependent upon core flow (% of Rated), and the max core flow limit, (Rated or Increased Core Flow, ICF). MCPRF limits are shown in Figure 4.1, per Reference 1. Limits are valid for all EOOS combinations. No adjustment is required for SLO conditions.

4.2 Power Dependent MCPR Limit: MCPRP MCPRP limits are dependent upon:

Core Power Level (% of Rated)

Technical Specification Scram Speed (TSSS), Nominal Scram Speed (NSS), or Optimum Scram Speed (OSS)

Cycle Operating Exposure (NEOC, EOC, and CD - as defined in this section)

Equipment Out-Of-Service Options Two or Single recirculation Loop Operation (TLO vs. SLO)

The MCPRP limits are provided in Table 4.2 through Table 4.9, where each table contains the limits for all fuel types and EOOS options (for a specified scram speed and exposure range).

The CMSS determines MCPRP limits, from these tables, based on linear interpolation between the specified powers.

4.2.1 Startup without Feedwater Heaters There is a range of operation during startup when the feedwater heaters are not placed into service until after the unit has reached a significant operating power level. Additional power dependent limits are shown in Table 4.5 through Table 4.8 based on temperature conditions identified in Table 3.1.

Browns Ferry Unit 3 Cycle 21 Page 13 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 4.2.2 Scram Speed Dependent Limits (TSSS vs. NSS vs. OSS)

MCPRP limits are provided for three different sets of assumed scram speeds. The Technical Specification Scram Speed (TSSS) MCPRP limits are applicable at all times, as long as the scram time surveillance demonstrates the times in Technical Specification Table 3.1.4-1 are met. Both Nominal Scram Speeds (NSS) and/or Optimum Scram Speeds (OSS) may be used, as long as the scram time surveillance demonstrates Table 4.1 times are applicable.

• 3F3F3F 4F4F4F Table 4.1 Nominal Scram Time Basis Notch Nominal Optimum Position Scram Timing Scram Timing (index) (seconds) (seconds) 46 0.420 0.380 36 0.980 0.875 26 1.600 1.465 6 2.900 2.900 In demonstrating compliance with the NSS and/or OSS scram time basis, surveillance requirements from Technical Specification 3.1.4 apply; accepting the definition of SLOW rods should conform to scram speeds shown in Table 4.1. If conformance is not demonstrated, TSSS based MCPRP limits are applied.

On initial cycle startup, TSSS limits are used until the successful completion of scram timing confirms NSS and/or OSS based limits are applicable.

4.2.3 Exposure Dependent Limits Exposures are tracked on a Core Average Exposure basis (CAVEX, not Cycle Exposure).

Higher exposure MCPRP limits are always more limiting and may be used for any Core Average Exposure up to the ending exposure. Per Reference 1, MCPRP limits are provided for the following exposure ranges:

BOC to NEOC NEOC corresponds to 30,487.9 MWd / MTU BOC to EOCLB EOCLB corresponds to 33,437.4 MWd / MTU BOC to End of Coast End of Coast 35,132.2 MWd / MTU NEOC refers to a Near EOC exposure point.

• Reference 1 analysis results are based on information identified in Reference 4.

Drop out times consistent with method used to perform actual timing measurements (i.e., including pickup/dropout effects).

Browns Ferry Unit 3 Cycle 21 Page 14 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 The EOCLB exposure point is not the true End-Of-Cycle exposure. Instead, it corresponds to a licensing exposure window exceeding expected end-of-full-power-life.

The End of Coast exposure point represents a licensing exposure point exceeding the expected end-of-cycle exposure including cycle extension options.

4.2.4 Equipment Out-Of-Service (EOOS) Options EOOS options

• covered by MCPRP limits are given by the following:

5F5F5F In-Service All equipment In-Service RPTOOS EOC-Recirculation Pump Trip Out-Of-Service TBVOOS Turbine Bypass Valve(s) Out-Of-Service RPTOOS+TBVOOS Combined RPTOOS and TBVOOS PLUOOS Power Load Unbalance Out-Of-Service PLUOOS+RPTOOS Combined PLUOOS and RPTOOS PLUOOS+TBVOOS Combined PLUOOS and TBVOOS PLUOOS+TBVOOS+RPTOOS Combined PLUOOS, RPTOOS, and TBVOOS FHOOS (or FFWTR) Feedwater Heaters Out-Of-Service (or Final Feedwater Temperature Reduction)

RCPOOS One Recirculation Pump Out-Of-Service For exposure ranges up to NEOC and EOCLB, additional combinations of MCPRP limits are also provided including FHOOS. The coast down exposure range assumes application of FFWTR. FHOOS based MCPRP limits for the coast down exposure are redundant because the temperature setdown assumption is identical with FFWTR.

4.2.5 Single-Loop-Operation (SLO) Limits When operating in RCPOOS conditions, MCPRP limits are constructed differently from the normal operating RCP conditions. The limiting event for RCPOOS is a pump seizure scenario, which sets the upper bound for allowed core power and flow . This event is not impacted by 6F6F6F scram time assumptions. Specific MCPRP limits are shown in Table 4.9.

4.2.6 Below PBypass Limits Below PBypass (26% rated power), MCPRP limits depend upon core flow. One set of MCPRP limits applies for core flow above 50% of rated; a second set applies if the core flow is less than or equal to 50% rated.

• All equipment service conditions assume 1 SRVOOS.

RCPOOS limits are only valid up to 43.75% rated core power, 50% rated core flow, and an active recirculation drive flow of 17.73 Mlbm/hr.

Browns Ferry Unit 3 Cycle 21 Page 15 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 2.00 1.80 1.60 MCPRF 1.40 1.20 1.00 30 40 50 60 70 80 90 100 110 Core Flow (% Rated)

Core Flow MCPRF

(% Rated) 30.0 1.58 84.0 1.34 107.0 1.34 Figure 4.1 MCPRF for All Fuel Types (Values bound all EOOS conditions)

(107.0% maximum core flow line is used to support 105% rated flow operation, ICF)

Browns Ferry Unit 3 Cycle 21 Page 16 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.2 MCPRP Limits for All Fuel Types: Optimum Scram Time Basis

• 7F7F7F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.41 1.42 1.45 90 1.45 1.46 1.49 77.6 1.52 1.52 1.56 65 1.58 1.58 1.64

>50 1.68 1.68 1.75 Base Case 50 1.81 1.81 1.82 40 1.88 1.88 1.91 26 2.30 2.30 2.43 26 at > 50%F 2.59 2.59 2.71 23 at > 50%F 2.76 2.76 2.90 26 at 50%F 2.51 2.51 2.62 23 at 50%F 2.67 2.67 2.80 100 1.45 1.45 ---

90 1.49 1.49 ---

77.6 1.56 1.56 ---

65 1.64 1.64 ---

>50 1.75 1.75 ---

50 1.82 1.82 ---

FHOOS 40 1.91 1.91 ---

26 2.43 2.43 ---

26 at > 50%F 2.71 2.71 ---

23 at > 50%F 2.90 2.90 ---

26 at 50%F 2.62 2.62 ---

23 at 50%F 2.80 2.80 ---

• All limits, including Base Case, support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

FFWTR/FHOOS is supported for the BOC to End of Coast limits.

Browns Ferry Unit 3 Cycle 21 Page 17 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.3 MCPRP Limits for All Fuel Types: Nominal Scram Time Basis

• 8F8F8F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.42 1.43 1.49 90 1.48 1.48 1.54 77.6 1.54 1.54 1.61 65 1.61 1.61 1.69

>50 1.70 1.70 1.79 50 1.82 1.82 1.85 Base Case 40 1.89 1.89 1.95 26 2.33 2.33 2.48 26 at > 50%F 2.59 2.59 2.73 23 at > 50%F 2.76 2.76 2.92 26 at 50%F 2.51 2.51 2.64 23 at 50%F 2.67 2.67 2.82 100 1.48 1.49 1.54 90 1.53 1.53 1.59 77.6 1.59 1.59 1.65 65 1.66 1.66 1.73

>50 1.74 1.74 1.83 50 1.84 1.84 1.87 TBVOOS 40 1.91 1.91 1.98 26 2.35 2.35 2.50 26 at > 50%F 3.11 3.11 3.27 23 at > 50%F 3.38 3.38 3.54 26 at 50%F 2.85 2.85 3.03 23 at 50%F 3.14 3.14 3.33 100 1.49 1.49 ---

90 1.54 1.54 ---

77.6 1.61 1.61 ---

65 1.69 1.69 ---

>50 1.79 1.79 ---

50 1.85 1.85 ---

FHOOS 40 1.95 1.95 ---

26 2.48 2.48 ---

26 at > 50%F 2.73 2.73 ---

23 at > 50%F 2.92 2.92 ---

26 at 50%F 2.64 2.64 ---

23 at 50%F 2.82 2.82 ---

100 1.42 1.43 1.49 90 1.48 1.48 1.54 77.6 1.54 1.54 1.61 65 1.75 1.75 1.78

>50 --- --- ---

50 1.83 1.83 1.85 PLUOOS 40 1.89 1.89 1.95 26 2.33 2.33 2.48 26 at > 50%F 2.59 2.59 2.73 23 at > 50%F 2.76 2.76 2.92 26 at 50%F 2.51 2.51 2.64 23 at 50%F 2.67 2.67 2.82

• All limits, including Base Case, support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

FFWTR and FHOOS assume the same value of temperature drop. Consequently, FHOOS limits are not provided for BOC to End of COAST due to redundancy. Thermal limits for the BOC to End of COAST exposure applicability window are developed to conservatively bound FHOOS limits for earlier exposure applicability windows.

Browns Ferry Unit 3 Cycle 21 Page 18 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.3 MCPRP Limits for All Fuel Types: Nominal Scram Time Basis (continued)

• 9F9F9F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.54 1.54 ---

90 1.59 1.59 ---

77.6 1.65 1.65 ---

65 1.73 1.73 ---

>50 1.83 1.83 ---

TBVOOS 50 1.87 1.87 ---

FHOOS 40 1.98 1.98 ---

26 2.50 2.50 ---

26 at > 50%F 3.27 3.27 ---

23 at > 50%F 3.54 3.54 ---

26 at 50%F 3.03 3.03 ---

23 at 50%F 3.33 3.33 ---

100 1.48 1.49 1.54 90 1.53 1.53 1.59 77.6 1.59 1.59 1.65 65 1.77 1.77 1.80

>50 --- --- ---

TBVOOS 50 1.84 1.84 1.87 PLUOOS 40 1.91 1.91 1.98 26 2.35 2.35 2.50 26 at > 50%F 3.11 3.11 3.27 23 at > 50%F 3.38 3.38 3.54 26 at 50%F 2.85 2.85 3.03 23 at 50%F 3.14 3.14 3.33 100 1.49 1.49 ---

90 1.54 1.54 ---

77.6 1.61 1.61 ---

65 1.78 1.78 ---

>50 --- --- ---

FHOOS 50 1.85 1.85 ---

PLUOOS 40 1.95 1.95 ---

26 2.48 2.48 ---

26 at > 50%F 2.73 2.73 ---

23 at > 50%F 2.92 2.92 ---

26 at 50%F 2.64 2.64 ---

23 at 50%F 2.82 2.82 ---

100 1.54 1.54 ---

90 1.59 1.59 ---

77.6 1.65 1.65 ---

65 1.80 1.80 ---

>50 --- --- ---

TBVOOS 50 1.87 1.87 ---

FHOOS 40 1.98 1.98 ---

PLUOOS 26 2.50 2.50 ---

26 at > 50%F 3.27 3.27 ---

23 at > 50%F 3.54 3.54 ---

26 at 50%F 3.03 3.03 ---

23 at 50%F 3.33 3.33 ---

• All limits, including Base Case, support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

FFWTR and FHOOS assume the same value of temperature drop. Consequently, FHOOS limits are not provided for BOC to End of COAST due to redundancy. Thermal limits for the BOC to End of COAST exposure applicability window are developed to conservatively bound FHOOS limits for earlier exposure applicability windows.

Browns Ferry Unit 3 Cycle 21 Page 19 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.4 MCPRP Limits for All Fuel Types: Technical Specification Scram Time Basis

• 10F10F10F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.46 1.46 1.54 90 1.51 1.51 1.58 77.6 1.57 1.57 1.65 65 1.64 1.64 1.73

>50 1.73 1.73 1.83 50 1.84 1.85 1.89 Base Case 40 1.90 1.91 1.99 26 2.36 2.36 2.52 26 at > 50%F 2.60 2.60 2.75 23 at > 50%F 2.77 2.77 2.94 26 at 50%F 2.52 2.52 2.66 23 at 50%F 2.68 2.68 2.84 100 1.53 1.53 1.60 90 1.58 1.58 1.64 77.6 1.63 1.63 1.71 65 1.70 1.70 1.78

>50 1.78 1.78 1.88 50 1.87 1.88 1.92 TBVOOS 40 1.93 1.94 2.03 26 2.39 2.39 2.55 26 at > 50%F 3.13 3.13 3.30 23 at > 50%F 3.40 3.40 3.57 26 at 50%F 2.87 2.87 3.06 23 at 50%F 3.16 3.16 3.36 100 1.54 1.54 ---

90 1.58 1.58 ---

77.6 1.65 1.65 ---

65 1.73 1.73 ---

>50 1.83 1.83 ---

50 1.88 1.89 ---

FHOOS 40 1.99 1.99 ---

26 2.52 2.52 ---

26 at > 50%F 2.75 2.75 ---

23 at > 50%F 2.94 2.94 ---

26 at 50%F 2.66 2.66 ---

23 at 50%F 2.84 2.84 ---

100 1.46 1.46 1.54 90 1.51 1.51 1.58 77.6 1.57 1.57 1.65 65 1.77 1.77 1.81

>50 --- --- ---

50 1.84 1.85 1.89 PLUOOS 40 1.90 1.91 1.99 26 2.36 2.36 2.52 26 at > 50%F 2.60 2.60 2.75 23 at > 50%F 2.77 2.77 2.94 26 at 50%F 2.52 2.52 2.66 23 at 50%F 2.68 2.68 2.84

• All limits, including Base Case, support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

FFWTR and FHOOS assume the same value of temperature drop. Consequently, FHOOS limits are not provided for BOC to End of COAST due to redundancy. Thermal limits for the BOC to End of COAST exposure applicability window are developed to conservatively bound FHOOS limits for earlier exposure applicability windows.

Browns Ferry Unit 3 Cycle 21 Page 20 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.4 MCPRP Limits for All Fuel Types: Technical Specification Scram Time Basis (continued)

• 1F1F1F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.60 1.60 ---

90 1.64 1.64 ---

77.6 1.71 1.71 ---

65 1.78 1.78 ---

>50 1.88 1.88 ---

TBVOOS 50 1.91 1.92 ---

FHOOS 40 2.03 2.03 ---

26 2.55 2.55 ---

26 at > 50%F 3.30 3.30 ---

23 at > 50%F 3.57 3.57 ---

26 at 50%F 3.06 3.06 ---

23 at 50%F 3.36 3.36 ---

100 1.53 1.53 1.60 90 1.58 1.58 1.64 77.6 1.63 1.63 1.71 65 1.80 1.80 1.84

>50 --- --- ---

TBVOOS 50 1.87 1.88 1.92 PLUOOS 40 1.93 1.94 2.03 26 2.39 2.39 2.55 26 at > 50%F 3.13 3.13 3.30 23 at > 50%F 3.40 3.40 3.57 26 at 50%F 2.87 2.87 3.06 23 at 50%F 3.16 3.16 3.36 100 1.54 1.54 ---

90 1.58 1.58 ---

77.6 1.65 1.65 ---

65 1.81 1.81 ---

>50 --- --- ---

FHOOS 50 1.88 1.89 ---

PLUOOS 40 1.99 1.99 ---

26 2.52 2.52 ---

26 at > 50%F 2.75 2.75 ---

23 at > 50%F 2.94 2.94 ---

26 at 50%F 2.66 2.66 ---

23 at 50%F 2.84 2.84 ---

100 1.60 1.60 ---

90 1.64 1.64 ---

77.6 1.71 1.71 ---

65 1.84 1.84 ---

>50 --- --- ---

TBVOOS 50 1.91 1.92 ---

FHOOS 40 2.03 2.03 ---

PLUOOS 26 2.55 2.55 ---

26 at > 50%F 3.30 3.30 ---

23 at > 50%F 3.57 3.57 ---

26 at 50%F 3.06 3.06 ---

23 at 50%F 3.36 3.36 ---

• All limits, including Base Case, support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

FFWTR and FHOOS assume the same value of temperature drop. Consequently, FHOOS limits are not provided for BOC to End of COAST due to redundancy. Thermal limits for the BOC to End of COAST exposure applicability window are developed to conservatively bound FHOOS limits for earlier exposure applicability windows.

Browns Ferry Unit 3 Cycle 21 Page 21 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.5 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 1 for All Fuel Types: Nominal Scram Time Basis

• 12F12F12F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.49 1.49 1.49 90 1.54 1.54 1.54 77.6 1.61 1.61 1.61 65 1.78 1.78 1.78

>50 --- --- ---

50 1.90 1.90 1.90 TBVIS 40 2.13 2.13 2.13 26 2.74 2.74 2.74 26 at > 50%F 2.98 2.98 2.98 23 at > 50%F 3.22 3.22 3.22 26 at 50%F 2.87 2.87 2.87 23 at 50%F 3.10 3.10 3.10 100 1.54 1.54 1.54 90 1.59 1.59 1.59 77.6 1.65 1.65 1.65 65 1.80 1.80 1.80

>50 --- --- ---

50 1.93 1.93 1.93 TBVOOS 40 2.15 2.15 2.15 26 2.76 2.76 2.76 26 at > 50%F 3.47 3.47 3.47 23 at > 50%F 3.77 3.77 3.77 26 at 50%F 3.23 3.23 3.23 23 at 50%F 3.56 3.56 3.56

• Limits support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

Limits are applicable for all other EOOS scenarios, apart from TBV.

Limits are only valid up to 50% rated core power. Values shown above the valid power range are included to support CMSS functionality and Reference 1 documentation consistency.

Browns Ferry Unit 3 Cycle 21 Page 22 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.6 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 2 for All Fuel Types: Nominal Scram Time Basis

• 13F13F13F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.49 1.49 1.49 90 1.54 1.54 1.54 77.6 1.61 1.61 1.61 65 1.78 1.78 1.78

>50 --- --- ---

50 1.91 1.91 1.91 TBVIS 40 2.13 2.13 2.13 26 2.76 2.76 2.76 26 at > 50%F 2.99 2.99 2.99 23 at > 50%F 3.23 3.23 3.23 26 at 50%F 2.89 2.89 2.89 23 at 50%F 3.12 3.12 3.12 100 1.54 1.54 1.54 90 1.59 1.59 1.59 77.6 1.65 1.65 1.65 65 1.80 1.80 1.80

>50 --- --- ---

50 1.93 1.93 1.93 TBVOOS 40 2.15 2.15 2.15 26 2.78 2.78 2.78 26 at > 50%F 3.48 3.48 3.48 23 at > 50%F 3.79 3.79 3.79 26 at 50%F 3.25 3.25 3.25 23 at 50%F 3.58 3.58 3.58

• Limits support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

Limits are applicable for all other EOOS scenarios, apart from TBV.

Limits are only valid up to 50% rated core power. Values shown above the valid power range are included to support CMSS functionality and Reference 1 documentation consistency.

Browns Ferry Unit 3 Cycle 21 Page 23 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.7 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 1 for All Fuel Types: Technical Specification Scram Time Basis

• 14F14F14F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.54 1.54 1.54 90 1.58 1.58 1.58 77.6 1.65 1.65 1.65 65 1.81 1.81 1.81

>50 --- --- ---

50 1.94 1.94 1.94 TBVIS 40 2.17 2.17 2.17 26 2.79 2.79 2.79 26 at > 50%F 3.00 3.00 3.00 23 at > 50%F 3.24 3.24 3.24 26 at 50%F 2.89 2.89 2.89 23 at 50%F 3.12 3.12 3.12 100 1.60 1.60 1.60 90 1.64 1.64 1.64 77.6 1.71 1.71 1.71 65 1.84 1.84 1.84

>50 --- --- ---

50 1.98 1.98 1.98 TBVOOS 40 2.20 2.20 2.20 26 2.82 2.82 2.82 26 at > 50%F 3.50 3.50 3.50 23 at > 50%F 3.80 3.80 3.80 26 at 50%F 3.26 3.26 3.26 23 at 50%F 3.59 3.59 3.59

• Limits support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

Limits are applicable for all other EOOS scenarios, apart from TBV.

Limits are only valid up to 50% rated core power. Values shown above the valid power range are included to support CMSS functionality and Reference 1 documentation consistency.

Browns Ferry Unit 3 Cycle 21 Page 24 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.8 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 2 for All Fuel Types: Technical Specification Scram Time Basis

• 15F15F15F ATRIUM-10XM BOC BOC BOC Power to to to End of Operating

(% of rated) NEOC EOCLB Coast Condition 100 1.54 1.54 1.54 90 1.58 1.58 1.58 77.6 1.65 1.65 1.65 65 1.81 1.81 1.81

>50 --- --- ---

50 1.94 1.94 1.94 TBVIS 40 2.18 2.18 2.18 26 2.81 2.81 2.81 26 at > 50%F 3.01 3.01 3.01 23 at > 50%F 3.25 3.25 3.25 26 at 50%F 2.91 2.91 2.91 23 at 50%F 3.14 3.14 3.14 100 1.60 1.60 1.60 90 1.64 1.64 1.64 77.6 1.71 1.71 1.71 65 1.84 1.84 1.84

>50 --- --- ---

50 1.98 1.98 1.98 TBVOOS 40 2.21 2.21 2.21 26 2.84 2.84 2.84 26 at > 50%F 3.51 3.51 3.51 23 at > 50%F 3.82 3.82 3.82 26 at 50%F 3.28 3.28 3.28 23 at 50%F 3.61 3.61 3.61

• Limits support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

Limits are applicable for all other EOOS scenarios, apart from TBV.

Limits are only valid up to 50% rated core power. Values shown above the valid power range are included to support CMSS functionality and Reference 1 documentation consistency.

Browns Ferry Unit 3 Cycle 21 Page 25 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 4.9 MCPRP Limits for All Fuel Types: Single Loop Operation for All Scram Times

• 16F16F16F Power BOC to End of COAST Operating Condition (% of rated) ATRIUM-10XM 100 2.03 43.75 2.03 40 2.03 RCPOOS 26 2.54 FHOOS 26 at > 50%F 2.77 23 at > 50%F 2.96 26 at 50%F 2.68 23 at 50%F 2.86 100 2.03 43.75 2.03 RCPOOS 40 2.05 TBVOOS 26 2.57 PLUOOS 26 at > 50%F 3.32 FHOOS 23 at > 50%F 3.59 26 at 50%F 3.08 23 at 50%F 3.38 100 2.14 43.75 2.14 40 2.22 RCPOOS 26 2.84 TBVOOS 26 at > 50%F 3.52 FHOOS1 23 at > 50%F 3.82 26 at 50%F 3.28 23 at 50%F 3.61 100 2.15 43.75 2.15 40 2.23 RCPOOS 26 2.86 TBVOOS 26 at > 50%F 3.53 FHOOS2 23 at > 50%F 3.84 26 at 50%F 3.30 23 at 50%F 3.63

• All limits, including Base Case, support RPTOOS operation; operation is supported for any combination of 1 MSRVOOS, up to 2 TIPOOS (or the equivalent number of TIP channels), and up to 50% of the LPRMs out-of-service.

FFWTR and FHOOS assume the same value of temperature drop.

RCPOOS limits are only valid up to 43.75% rated core power (Values shown above the valid power range are included to support CMSS functionality and Reference 1 documentation consistency.), 50% rated core flow, and an active recirculation drive flow of 17.73 Mlbm/hr.

Browns Ferry Unit 3 Cycle 21 Page 26 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 5 Thermal-Hydraulic Stability Protection (Technical Specification 3.3.1.1)

Technical Specification Table 3.3.1.1-1, Function 2f, identifies the function.

Instrument setpoints are established, such that the reactor will be tripped before an oscillation can grow to the point where the SLMCPR is exceeded. With application of Reference 30, the DSS-CD stability solution will be used per Reference 26. The DSS-CD SAD setpoint is 1.10 for TLO and SLO.

New analyses have been developed based on Reference 26. With the implementation of the MELLLA+ operating domain expansion, an ABSP trip is required when the OPRM is out-of-service. The ABSP trip settings define a region of the power to flow map within which an automatic reactor scram occurs. The ABSP trip settings are provided in Table 5.1. If both the OPRM and ABSP are out-of-service, operation within the MELLLA+ domain is not allowed and the MBSP Regions provide stability protection. Table 5.2 and Table 5.3 provide the endpoints for the MBSP regions for nominal and reduced feedwater temperature conditions.

Table 5.1 ABSP Setpoints for the Scram Region Parameter Symbol Setting Value (unit) Comments Slope of ABSP APRM low Flow Biased Slope for Trip mTRIP 2.00 (% RTP/% RDF)

Trip Linear Segment ABSP APRM Flow Biased Trip Constant Power Setpoint Power Intercept. Constant PBSP-TRIP 35.0 (% RTP)

Line for Trip Power Line for Trip from Zero Drive Flow to Flow Breakpoint Value ABSP APRM Flow Biased Trip Constant Flow Line Setpoint Drive Flow Intercept.

WBSP-TRIP 49 (% RDF) for Trip Constant Flow Line for Trip (see Note 1 below)

Flow Breakpoint WBSP-BREAK 30.0 (% RDF) Flow Breakpoint Value Note 1: WBSP-TRIP can be set to 49.0 % RDF or any higher value up to the intersection of the ABSP sloped line with the APRM Flow Biased STP scram line.

Browns Ferry Unit 3 Cycle 21 Page 27 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 5.2 Analyzed MBSP Endpoints: Nominal Feedwater Temperature Power Core Flow Endpoint Definition

(% Rated) (% Rated)

Scram Region (Region I)

A1 75.9 52.7 Boundary Intercept on MELLLA+

Line Scram Region (Region I)

B1 35.5 29.0 Boundary Intercept on Natural Circulation Line (NCL)

Controlled Entry Region (Region A2 66.1 52.0 II) Boundary Intercept on MELLLA Line Controlled Entry Region (Region B2 25.5 29.0 II) Boundary Intercept on Natural Circulation Line (NCL)

Table 5.3 Analyzed MBSP Endpoints: Reduced Feedwater Temperature Power Core Flow Endpoint Definition

(% Rated) (% Rated)

Scram Region (Region I)

A1 64.9 50.5 Boundary Intercept on MELLLA Line Scram Region (Region I)

B1 29.4 29.0 Boundary Intercept on Natural Circulation Line (NCL)

Controlled Entry Region (Region A2 68.3 54.9 II) Boundary Intercept on MELLLA Line Controlled Entry Region (Region B2 24.5 29.0 II) Boundary Intercept on Natural Circulation Line (NCL)

Browns Ferry Unit 3 Cycle 21 Page 28 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 6 APRM Flow Biased Rod Block Trip Settings (Technical Requirements Manual Section 5.3.1 and Table 3.3.4-1)

The APRM rod block trip setting is based upon References 27 & 29, and is defined by the following:

for two loop operation:

SRB (0.61Wd + 63.3) Allowable Value SRB (0.61Wd + 62.0) Nominal Trip Setpoint (NTSP) where:

SRB = Rod Block setting in percent of rated thermal power (3952 MWt)

Wd = Recirculation drive flow rate in percent of rated (100% drive flow required to achieve 100% core power and flow) and for single loop operation:

SRB (0.55(Wd-W) + 60.5) Allowable Value SRB (0.55(Wd-W) + 58.5) Nominal Trip Setpoint (NTSP) where:

SRB = Rod Block setting in percent of rated thermal power (3952 MWt)

Wd = Recirculation drive flow rate in percent of rated (100% drive flow required to achieve 100% core power and flow)

W = Difference between two-loop and single-loop effective recirculation flow at the same core flow (W=0.0 for two-loop operation)

The APRM rod block trip setting is clamped at a maximum allowable value of 115%

(corresponding to a NTSP of 113%).

Browns Ferry Unit 3 Cycle 21 Page 29 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 7 Rod Block Monitor (RBM) Trip Setpoints and Operability (Technical Specification Table 3.3.2.1-1)

The RBM trip setpoints and applicable power ranges, based on References 27 & 28, are shown in Table 7.1. Setpoints are based on an HTSP, unfiltered analytical limit of 114%. Unfiltered setpoints are consistent with a nominal RBM filter setting of 0.0 seconds; filtered setpoints are consistent with a nominal RBM filter setting less than 0.5 seconds. Cycle specific CRWE analyses of OLMCPR are documented in Reference 1, superseding values reported in References 27, 28, and 29.

Table 7.1 Analytical RBM Trip Setpoints

• 18F18F17F Allowable Nominal Trip RBM Value Setpoint Trip Setpoint (AV) (NTSP)

LPSP 27% 25%

IPSP 62% 60%

HPSP 82% 80%

LTSP - unfiltered 121.7% 120.0%

- filtered 120.7% 119.0%

ITSP - unfiltered 116.7% 115.0%

- filtered 115.7% 114.0%

HTSP - unfiltered 111.7% 110.0%

- filtered 110.9% 109.2%

DTSP 90% 92%

As a result of cycle specific CRWE analyses, RBM setpoints in Technical Specification Table 3.3.2.1-1 are applicable as shown in Table 7.2. Cycle specific setpoint analysis results are shown in Table 7.3, per Reference 1.

Table 7.2 RBM Setpoint Applicability Thermal Power Applicable Notes from

(% Rated) MCPR 19F19F18F Table 3.3.2.1-1 Comment

< 1.59 (a), (b), (f), (h) two loop operation

> 27% and < 90%

< 1.62 (a), (b), (f), (h) single loop operation 90% < 1.34 (g) two loop operation 20F20F19F

• Values are considered maximums. Using lower values, due to RBM system hardware/software limitations, is conservative, and acceptable.

MCPR values shown correspond with, (support), SLMPCR values identified in Reference 1.

Greater than 90% rated power is not attainable in single loop operation.

Browns Ferry Unit 3 Cycle 21 Page 30 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Table 7.3 Control Rod Withdrawal Error Results RBM CRWE HTSP Analytical Limit OLMCPR Unfiltered 107 1.26 111 1.30 114 1.31 117 1.32 Results, compared against the base case OLMCPR results of Table 4.2, indicate SLMCPR remains protected for RBM inoperable conditions (i.e., 114% unblocked).

Browns Ferry Unit 3 Cycle 21 Page 31 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 8 Shutdown Margin Limit (Technical Specification 3.1.1)

Assuming the strongest OPERABLE control blade is fully withdrawn, and all other OPERABLE control blades are fully inserted, the core shall be sub-critical and meet the following minimum shutdown margin:

SDM 0.38% dk/k Browns Ferry Unit 3 Cycle 21 Page 32 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Appendix A: MBSP Maps Browns Ferry Unit 3 Cycle 21 Page A-1 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Core Power (% Rated: 100% = 3952MWt) 110 100 MELLLA+ Region 90 80 BSP Boundary Manual 70 Scram Region I 60 MELLLA Region ICF Region MELLLA Upper Boundary 50 87.5% Rod Line 40 Controlled Entry Region II 30 Min. Flow Control 20 Natural Min. Power Line Circulation 10 20% Pump Speed Line 0

0 10 20 30 40 50 60 70 80 90 100 110 120 Core Flow (% Rated: 100% =102.5 MLb m /hr)

Figure A.1 MBSP Boundaries For Nominal Feedwater Temperature (Operation in the MELLLA+ Region Prohibited for Feedwater Temperature greater than 10 degrees F below the Nominal Feedwater Temperature)

Browns Ferry Unit 3 Cycle 21 Page A-2 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)

ECM: L32 211222 800 Reactor Engineering and Fuels - BWRFE Date: January 17, 2022 1101 Market Street, Chattanooga TN 37402 Core Power (% Rated: 100% = 3952MWt) 110 100 MELLLA+ Region 90 80 BSP Boundary 70 Manual Scram 60 Region I MELLLA Region MELLLA Upper Boundary ICF Region 50 87.5% Rod Line Controlled Entry 40 Region II 30 Min. Flow Control 20 Natural Min. Power Line Circulation 10 20% Pump Speed Line 0

0 10 20 30 40 50 60 70 80 90 100 110 120 Core Flow (% Rated: 100% =102.5 MLb m /hr)

Figure A.2 MBSP Boundaries For Reduced Feedwater Temperature (Operation in the MELLLA+ Region Prohibited for a Reduced Feedwater Temperature greater than 10 degrees F below the Nominal Feedwater Temperature)

Browns Ferry Unit 3 Cycle 21 Page A-3 Core Operating Limits Report, (120% OLTP, MELLLA+) TVA-COLR-BF3C21, Revision 0 (Final)