ML20073H384

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Core Operating Limits Report for Cycle 20 Operation, Revision 0
ML20073H384
Person / Time
Site: Browns Ferry Tennessee Valley Authority icon.png
Issue date: 03/13/2020
From: Bono S
Tennessee Valley Authority
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML20073H384 (46)
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Tennessee Valley Authority, Post Office Box 2000, Decatur, Alabama 35609-2000 March 13, 2020 10 CFR 50.4 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

Browns Ferry Nuclear Plant, Unit 3 Renewed Facility Operating License No. DPR-68 NRC Docket No. 50-296 Browns Ferry Nuclear Plant, Unit 3 Core Operating Limits Report for Cycle 20 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 20, Core Operating Limits Report (COLR). Revision O of the Unit 3 COLR includes all Modes of operation (Modes 1 through 5).

There are no new commitments contained in this letter. If you have any questions please contact J. L. Paul at (256) 729-7874.

Enclosure:

Core perating Limits Report, (120% OLTP, MELLLA+), for Unit 3 Cycle 20 Operation, TVA-COLR-BF3C20, 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 Unit3 Core Operating Limits Report, (120% OLTP, MELLLA+), for Unit 3 Cycle 20 Operation, TV A-COLR-BF3C20, Revision 0 (See Attached)

Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga, TN 37402 EDMS L94 200213 800 QA Document BFE-4485, Revision 0 Browns Ferry Unit 3 Cycle 20 Core Operating Limits Report, (120% OL TP, MELLLA+)

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TV A-COLR-BF3C20 Revision O (Final)

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EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page ii Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

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 MBSP Maps..................................................................................................... A-1

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page iii Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

List of Tables Nuclear Fuel Types

.............................................................................................................. 2 Startup Feedwater Temperature Basis....................................................................................... 6 Nominal Scram Time Basis.......................................................................................................14 MCPRP Limits for All Fuel Types: Optimum Scram Time Basis

............................................17 MCPRP Limits for All Fuel Types: Nominal Scram Time Basis

.............................................18 MCPRP Limits for All Fuel Types: Technical Specification Scram Time Basis

......................20 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 1 for All Fuel Types:

Nominal Scram Time Basis

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

Nominal Scram Time Basis

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

Technical Specification Scram Time Basis

..........................................................................24 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 2 for All Fuel Types:

Technical Specification Scram Time Basis

..........................................................................25 MCPRP Limits for All Fuel Types: Single Loop Operation for All Scram Times

....................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 Setpoints

.............................................................................................30 RBM Setpoint Applicability........................................................................................................30 Control Rod Withdrawal Error Results.......................................................................................31

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page iv Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

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

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page v Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Revision Log Number Page Description 0-R0 All New document.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page vi Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

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

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page vii Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

MAPFAC MAPLHGR multiplier (Power or Flow dependent)

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

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page viii Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

References

1.

ANP-3813, Revision 0, Browns Ferry Unit 3 Cycle 20 Reload Analysis, Framatome Inc., January 2020.

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 20 Plant Parameters Document, Framatome Inc., June 2019.

5.

BFE-4468, Revision 0, Browns Ferry Unit 3 Cycle 20 In-Core Shuffle, Tennessee Valley Authority, January 31, 2020.

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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page ix Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

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, R35, Setpoint and Scaling Calculation for Neutron Monitoring &

Recirculation Flow Loops, Calculation File, Tennessee Valley Authority, August 9, 2019.

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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 1 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 2 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 1.1 Nuclear Fuel Types

  • Fuel Description Original Cycle Number of Assemblies Nuclear Fuel Type (NFT)

Fuel Names (Range)

ATRIUM-10XM XMLC-4105B-11GV70-FCG 18 72 19 FCG601-FCG672 ATRIUM-10XM XMLC-4096B-12GV80-FCG 18 22 20 FCG673-FCG808 ATRIUM-10XM XMLC-4055B-13GV70-FCG 18 17 21 FCG809-FCG904 ATRIUM-10XM XMLC-3911B-13GV80-FCH 19 238 22 FCH001-FCH240 ATRIUM-10XM XMLC-4053B-12GV80-FCH 19 103 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 1.4 Acceptability Limits discussed in this document were generated based on NRC approved methodologies per References 6 through 25.

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 3 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 4 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0 3

6 9

12 15 0

20 40 60 80 APLHGR (kW/ft)

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

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 5 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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

Feedwater Heaters Out-Of-Service or Final Feedwater Temperature Reduction RCPOOS One Recirculation Pump Out-Of-Service

  • All equipment service conditions assume 1 SRVOOS.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 6 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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 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 Temperature

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 7 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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.

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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 8 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0 3

6 9

12 15 0

20 40 60 80 LHGR (kW/ft)

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

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 9 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 20 30 40 50 60 70 80 90 100 110 LHGRFACP Core Power (% Rated)

Turbine Bypass Valve Out-of-Service, TBVOOS Turbine Bypass Valve In-Service, TBVIS TBVIS, > 50% Core Flow TBVIS, 50% Core Flow TBVOOS, > 50% Core Flow TBVOOS, 50% Core Flow Core Core Power LHGRFACP Power LHGRFACP

(% Rated)

(% Rated) 100.0 1.00 100.0 1.00 26.0 0.64 26.0 0.62 26.0 0.45 26.0 0.38 23.0 0.41 23.0 0.35 26.0 0.49 26.0 0.49 23.0 0.46 23.0 0.42 Turbine Bypass In-Service Turbine Bypass Out-of-Service Core Flow > 50% Rated Core Flow > 50% Rated Core Flow 50% Rated Core Flow 50% Rated Figure 3.2 Base Operation LHGRFACP for ATRIUM-10XM Fuel (Independent of other EOOS conditions)

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 10 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0.55 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 20 30 40 50 60 70 80 90 100 110 LHGRFACF Core Flow (% Rated)

Core Flow LHGRFACF

(% Rated) 0.0 0.63 30.0 0.63 75.6 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)

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 11 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 20 30 40 50 60 70 80 90 100 110 LHGRFACP Core Power (% Rated)

Turbine Bypass Valve Out-of-Service, TBVOOS Turbine Bypass Valve In-Service, TBVIS TBVIS, > 50% Core Flow TBVIS, 50% Core Flow TBVOOS, > 50% Core Flow TBVOOS, 50% Core Flow Core Core Power LHGRFACP Power LHGRFACP

(% Rated)

(% Rated) 100.0 1.00 100.0 1.00 26.0 0.52 26.0 0.51 26.0 0.41 26.0 0.34 23.0 0.38 23.0 0.32 26.0 0.44 26.0 0.40 23.0 0.40 23.0 0.39 Turbine Bypass In-Service Turbine Bypass Out-of-Service Core Flow > 50% Rated Core Flow > 50% Rated Core Flow 50% Rated Core Flow 50% Rated 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)

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 12 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00 1.10 20 30 40 50 60 70 80 90 100 110 LHGRFACP Core Power (% Rated)

Turbine Bypass Valve Out-of-Service, TBVOOS Turbine Bypass Valve In-Service, TBVIS TBVIS, > 50% Core Flow TBVIS, 50% Core Flow TBVOOS, > 50% Core Flow TBVOOS, 50% Core Flow Core Core Power LHGRFACP Power LHGRFACP

(% Rated)

(% Rated) 100.0 1.00 100.0 1.00 26.0 0.52 26.0 0.51 26.0 0.41 26.0 0.34 23.0 0.38 23.0 0.32 26.0 0.44 26.0 0.40 23.0 0.40 23.0 0.39 Turbine Bypass In-Service Turbine Bypass Out-of-Service Core Flow > 50% Rated Core Flow > 50% Rated Core Flow 50% Rated Core Flow 50% Rated 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)

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 13 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 14 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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.

  • Table 4.1 Nominal Scram Time Basis Notch Nominal Optimum Position Scram Timing Scram Timing (index)

(seconds)

(seconds) 46 0.421 0.392 36 0.991 0.887 26 1.620 1.487 6

3.040 3.040 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 27,972.7 MWd / MTU BOC to EOCLB EOCLB corresponds to 33,104.7 MWd / MTU BOC to End of Coast End of Coast 34,799.5 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).

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 15 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

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:

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 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 16 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 1.00 1.20 1.40 1.60 1.80 2.00 30 40 50 60 70 80 90 100 110 MCPRF 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)

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 17 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.2 MCPRP Limits for All Fuel Types: Optimum Scram Time Basis

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.39 1.41 1.44 90 1.45 1.46 1.48 77.6 1.50 1.51 1.54 65 1.57 1.57 1.61

>50 1.65 1.65 1.70 50 1.79 1.79 1.79 40 1.87 1.87 1.88 26 2.27 2.27 2.38 26 at > 50%F 2.60 2.60 2.70 23 at > 50%F 2.76 2.76 2.88 26 at 50%F 2.49 2.49 2.60 23 at 50%F 2.64 2.64 2.77 100 1.42 1.44 90 1.48 1.48 77.6 1.54 1.54 65 1.61 1.61

>50 1.70 1.70 50 1.79 1.79 40 1.88 1.88 26 2.38 2.38 26 at > 50%F 2.70 2.70 23 at > 50%F 2.88 2.88 26 at 50%F 2.60 2.60 23 at 50%F 2.77 2.77 Operating Condition Base Case FHOOS ATRIUM-10XM

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 18 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.3 MCPRP Limits for All Fuel Types: Nominal Scram Time Basis

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.42 1.44 1.46 90 1.48 1.48 1.51 77.6 1.53 1.53 1.56 65 1.59 1.59 1.63

>50 1.67 1.67 1.72 50 1.80 1.80 1.80 40 1.88 1.88 1.90 26 2.30 2.30 2.41 26 at > 50%F 2.60 2.60 2.70 23 at > 50%F 2.76 2.76 2.88 26 at 50%F 2.49 2.49 2.60 23 at 50%F 2.64 2.64 2.77 100 1.46 1.47 1.50 90 1.51 1.51 1.54 77.6 1.56 1.56 1.60 65 1.62 1.62 1.66

>50 1.70 1.70 1.75 50 1.80 1.80 1.81 40 1.88 1.88 1.91 26 2.30 2.30 2.42 26 at > 50%F 3.11 3.11 3.25 23 at > 50%F 3.36 3.36 3.50 26 at 50%F 2.83 2.83 2.99 23 at 50%F 3.11 3.11 3.28 100 1.46 1.46 90 1.51 1.51 77.6 1.56 1.56 65 1.63 1.63

>50 1.72 1.72 50 1.80 1.80 40 1.90 1.90 26 2.41 2.41 26 at > 50%F 2.70 2.70 23 at > 50%F 2.88 2.88 26 at 50%F 2.60 2.60 23 at 50%F 2.77 2.77 100 1.42 1.44 1.46 90 1.48 1.48 1.51 77.6 1.53 1.53 1.56 65 1.72 1.73 1.73

>50 50 1.80 1.80 1.80 40 1.88 1.88 1.90 26 2.30 2.30 2.41 26 at > 50%F 2.60 2.60 2.70 23 at > 50%F 2.76 2.76 2.88 26 at 50%F 2.49 2.49 2.60 23 at 50%F 2.64 2.64 2.77 ATRIUM-10XM Operating Condition Base Case TBVOOS FHOOS PLUOOS

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 19 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.3 MCPRP Limits for All Fuel Types: Nominal Scram Time Basis (continued)

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.49 1.50 90 1.54 1.54 77.6 1.60 1.60 65 1.66 1.66

>50 1.75 1.75 50 1.81 1.81 40 1.91 1.91 26 2.42 2.42 26 at > 50%F 3.25 3.25 23 at > 50%F 3.50 3.50 26 at 50%F 2.99 2.99 23 at 50%F 3.28 3.28 100 1.46 1.47 1.50 90 1.51 1.51 1.54 77.6 1.56 1.56 1.60 65 1.72 1.73 1.74

>50 50 1.80 1.80 1.81 40 1.88 1.88 1.91 26 2.30 2.30 2.42 26 at > 50%F 3.11 3.11 3.25 23 at > 50%F 3.36 3.36 3.50 26 at 50%F 2.83 2.83 2.99 23 at 50%F 3.11 3.11 3.28 100 1.46 1.46 90 1.51 1.51 77.6 1.56 1.56 65 1.72 1.73

>50 50 1.80 1.80 40 1.90 1.90 26 2.41 2.41 26 at > 50%F 2.70 2.70 23 at > 50%F 2.88 2.88 26 at 50%F 2.60 2.60 23 at 50%F 2.77 2.77 100 1.49 1.50 90 1.54 1.54 77.6 1.60 1.60 65 1.73 1.74

>50 50 1.81 1.81 40 1.91 1.91 26 2.42 2.42 26 at > 50%F 3.25 3.25 23 at > 50%F 3.50 3.50 26 at 50%F 2.99 2.99 23 at 50%F 3.28 3.28 ATRIUM-10XM TBVOOS FHOOS TBVOOS PLUOOS FHOOS PLUOOS TBVOOS FHOOS PLUOOS Operating Condition

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 20 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.4 MCPRP Limits for All Fuel Types: Technical Specification Scram Time Basis

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.46 1.46 1.50 90 1.50 1.50 1.55 77.6 1.55 1.55 1.59 65 1.61 1.61 1.66

>50 1.68 1.68 1.75 50 1.80 1.80 1.82 40 1.88 1.88 1.94 26 2.32 2.32 2.44 26 at > 50%F 2.60 2.60 2.71 23 at > 50%F 2.76 2.76 2.89 26 at 50%F 2.49 2.49 2.61 23 at 50%F 2.64 2.64 2.78 100 1.50 1.50 1.54 90 1.55 1.55 1.59 77.6 1.59 1.59 1.64 65 1.65 1.65 1.70

>50 1.73 1.73 1.79 50 1.81 1.81 1.84 40 1.89 1.89 1.96 26 2.34 2.34 2.47 26 at > 50%F 3.12 3.12 3.27 23 at > 50%F 3.37 3.37 3.52 26 at 50%F 2.84 2.84 3.01 23 at 50%F 3.12 3.12 3.30 100 1.50 1.50 90 1.55 1.55 77.6 1.59 1.59 65 1.66 1.66

>50 1.75 1.75 50 1.81 1.81 40 1.94 1.94 26 2.44 2.44 26 at > 50%F 2.71 2.71 23 at > 50%F 2.89 2.89 26 at 50%F 2.61 2.61 23 at 50%F 2.78 2.78 100 1.46 1.46 1.50 90 1.50 1.50 1.55 77.6 1.55 1.55 1.59 65 1.73 1.74 1.75

>50 50 1.80 1.80 1.82 40 1.88 1.88 1.94 26 2.32 2.32 2.44 26 at > 50%F 2.60 2.60 2.71 23 at > 50%F 2.76 2.76 2.89 26 at 50%F 2.49 2.49 2.61 23 at 50%F 2.64 2.64 2.78 ATRIUM-10XM Operating Condition Base Case TBVOOS FHOOS PLUOOS

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 21 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.4 MCPRP Limits for All Fuel Types: Technical Specification Scram Time Basis (continued)

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.54 1.54 90 1.59 1.59 77.6 1.64 1.64 65 1.70 1.70

>50 1.79 1.79 50 1.83 1.83 40 1.96 1.96 26 2.47 2.47 26 at > 50%F 3.27 3.27 23 at > 50%F 3.52 3.52 26 at 50%F 3.01 3.01 23 at 50%F 3.30 3.30 100 1.50 1.50 1.54 90 1.55 1.55 1.59 77.6 1.59 1.59 1.64 65 1.74 1.75 1.77

>50 50 1.81 1.81 1.84 40 1.89 1.89 1.96 26 2.34 2.34 2.47 26 at > 50%F 3.12 3.12 3.27 23 at > 50%F 3.37 3.37 3.52 26 at 50%F 2.84 2.84 3.01 23 at 50%F 3.12 3.12 3.30 100 1.50 1.50 90 1.55 1.55 77.6 1.59 1.59 65 1.74 1.75

>50 50 1.81 1.81 40 1.94 1.94 26 2.44 2.44 26 at > 50%F 2.71 2.71 23 at > 50%F 2.89 2.89 26 at 50%F 2.61 2.61 23 at 50%F 2.78 2.78 100 1.54 1.54 90 1.59 1.59 77.6 1.64 1.64 65 1.76 1.77

>50 50 1.83 1.83 40 1.96 1.96 26 2.47 2.47 26 at > 50%F 3.27 3.27 23 at > 50%F 3.52 3.52 26 at 50%F 3.01 3.01 23 at 50%F 3.30 3.30 ATRIUM-10XM TBVOOS FHOOS TBVOOS PLUOOS FHOOS PLUOOS TBVOOS FHOOS PLUOOS Operating Condition

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 22 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.5 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 1 for All Fuel Types: Nominal Scram Time Basis

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.46 1.46 1.46 90 1.51 1.51 1.51 77.6 1.56 1.56 1.56 65 1.72 1.73 1.73

>50 50 1.84 1.84 1.84 40 2.07 2.07 2.07 26 2.66 2.66 2.66 26 at > 50%F 2.92 2.92 2.92 23 at > 50%F 3.14 3.14 3.14 26 at 50%F 2.82 2.82 2.82 23 at 50%F 3.04 3.04 3.04 100 1.49 1.50 1.50 90 1.54 1.54 1.54 77.6 1.60 1.60 1.60 65 1.73 1.74 1.74

>50 50 1.85 1.85 1.85 40 2.08 2.08 2.08 26 2.67 2.67 2.67 26 at > 50%F 3.44 3.44 3.44 23 at > 50%F 3.69 3.69 3.69 26 at 50%F 3.18 3.18 3.18 23 at 50%F 3.51 3.51 3.51 Operating Condition TBVIS TBVOOS ATRIUM-10XM

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 23 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.6 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 2 for All Fuel Types: Nominal Scram Time Basis

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.46 1.46 1.46 90 1.51 1.51 1.51 77.6 1.56 1.56 1.56 65 1.72 1.73 1.73

>50 50 1.85 1.85 1.85 40 2.08 2.08 2.08 26 2.68 2.68 2.68 26 at > 50%F 2.94 2.94 2.94 23 at > 50%F 3.15 3.15 3.15 26 at 50%F 2.84 2.84 2.84 23 at 50%F 3.06 3.06 3.06 100 1.49 1.50 1.50 90 1.54 1.54 1.54 77.6 1.60 1.60 1.60 65 1.73 1.74 1.74

>50 50 1.86 1.86 1.86 40 2.09 2.09 2.09 26 2.69 2.69 2.69 26 at > 50%F 3.45 3.45 3.45 23 at > 50%F 3.71 3.71 3.71 26 at 50%F 3.20 3.20 3.20 23 at 50%F 3.52 3.52 3.52 Operating Condition TBVIS TBVOOS ATRIUM-10XM

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 24 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.7 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 1 for All Fuel Types: Technical Specification Scram Time Basis

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.50 1.50 1.50 90 1.55 1.55 1.55 77.6 1.59 1.59 1.59 65 1.74 1.75 1.75

>50 50 1.88 1.88 1.88 40 2.11 2.11 2.11 26 2.70 2.70 2.70 26 at > 50%F 2.93 2.93 2.93 23 at > 50%F 3.15 3.15 3.15 26 at 50%F 2.83 2.83 2.83 23 at 50%F 3.05 3.05 3.05 100 1.54 1.54 1.54 90 1.59 1.59 1.59 77.6 1.64 1.64 1.64 65 1.76 1.77 1.77

>50 50 1.90 1.90 1.90 40 2.13 2.13 2.13 26 2.72 2.72 2.72 26 at > 50%F 3.46 3.46 3.46 23 at > 50%F 3.71 3.71 3.71 26 at 50%F 3.20 3.20 3.20 23 at 50%F 3.53 3.53 3.53 Operating Condition TBVIS TBVOOS ATRIUM-10XM

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 25 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.8 Startup Operation MCPRP Limits for Table 3.1 Temperature Range 2 for All Fuel Types: Technical Specification Scram Time Basis

  • BOC BOC BOC Pow er to to to End of

(% of rated)

NEOC EOCLB Coast 100 1.50 1.50 1.50 90 1.55 1.55 1.55 77.6 1.59 1.59 1.59 65 1.74 1.75 1.75

>50 50 1.89 1.89 1.89 40 2.12 2.12 2.12 26 2.72 2.72 2.72 26 at > 50%F 2.95 2.95 2.95 23 at > 50%F 3.16 3.16 3.16 26 at 50%F 2.85 2.85 2.85 23 at 50%F 3.07 3.07 3.07 100 1.54 1.54 1.54 90 1.59 1.59 1.59 77.6 1.64 1.64 1.64 65 1.76 1.77 1.77

>50 50 1.91 1.91 1.91 40 2.14 2.14 2.14 26 2.74 2.74 2.74 26 at > 50%F 3.47 3.47 3.47 23 at > 50%F 3.73 3.73 3.73 26 at 50%F 3.22 3.22 3.22 23 at 50%F 3.54 3.54 3.54 Operating Condition TBVIS TBVOOS ATRIUM-10XM

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 26 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 4.9 MCPRP Limits for All Fuel Types: Single Loop Operation for All Scram Times

  • Pow er BOC to End of COAST

(% of rated)

ATRIUM-10XM 100 2.10 43.75 2.10 40 2.10 26 2.46 26 at > 50%F 2.73 23 at > 50%F 2.91 26 at 50%F 2.63 23 at 50%F 2.80 100 2.10 43.75 2.10 40 2.10 26 2.49 26 at > 50%F 3.29 23 at > 50%F 3.54 26 at 50%F 3.03 23 at 50%F 3.32 100 2.15 43.75 2.15 40 2.15 26 2.74 26 at > 50%F 3.48 23 at > 50%F 3.73 26 at 50%F 3.22 23 at 50%F 3.55 100 2.16 43.75 2.16 40 2.16 26 2.76 26 at > 50%F 3.49 23 at > 50%F 3.75 26 at 50%F 3.24 23 at 50%F 3.56 RCPOOS TBVOOS FHOOS2 Operating Condition RCPOOS FHOOS RCPOOS TBVOOS PLUOOS FHOOS RCPOOS TBVOOS FHOOS1

  • 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 50% rated core power, 50% rated core flow, and an active recirculation drive flow of 17.73 Mlbm/hr.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 27 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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 for Trip mTRIP 2.00 (% RTP/% RDF)

Slope of ABSP APRM low Flow Biased Trip Linear Segment Constant Power Line for Trip PBSP-TRIP 35.0 (% RTP)

ABSP APRM Flow Biased Trip Setpoint Power Intercept. Constant Power Line for Trip from Zero Drive Flow to Flow Breakpoint Value Constant Flow Line for Trip WBSP-TRIP 49 (% RDF)

ABSP APRM Flow Biased Trip Setpoint Drive Flow Intercept.

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 w ith the APRM Flow Biased STP scram line.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 28 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 5.2 Analyzed MBSP Endpoints: Nominal Feedwater Temperature Endpoint Power

(% Rated)

Core Flow

(% Rated)

Definition A1 75.9 52.7 Scram Region (Region I)

Boundary Intercept on MELLLA+ Line B1 35.5 29.0 Scram Region (Region I)

Boundary Intercept on Natural Circulation Line (NCL)

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

Table 5.3 Analyzed MBSP Endpoints: Reduced Feedwater Temperature Endpoint Power

(% Rated)

Core Flow

(% Rated)

Definition A1 64.9 50.5 Scram Region (Region I)

Boundary Intercept on MELLLA Line B1 29.4 29.0 Scram Region (Region I)

Boundary Intercept on Natural Circulation Line (NCL)

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

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 29 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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%).

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 30 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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

  • RBM Trip Setpoint Allowable Value (AV)

Nominal Trip Setpoint (NTSP)

LPSP 27%

25%

IPSP 62%

60%

HPSP 82%

80%

LTSP - unfiltered

- filtered 121.7%

120.7%

120.0%

119.0%

ITSP - unfiltered

- filtered 116.7%

115.7%

115.0%

114.0%

HTSP - unfiltered

- filtered 111.7%

110.9%

110.0%

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

(% Rated)

Applicable MCPR Notes from Table 3.3.2.1-1 Comment

> 27% and < 90%

< 1.74 (a), (b), (f), (h) two loop operation

< 1.78 (a), (b), (f), (h) single loop operation 90%

< 1.38 (g) two loop operation

  • 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.

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 31 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

Table 7.3 Control Rod Withdrawal Error Results RBM CRWE HTSP Analytical Limit OLMCPR Unfiltered 107 1.26 111 1.28 114 1.30 117 1.36 Results, compared against the base case OLMCPR results of Table 4.2, indicate SLMCPR remains protected for RBM inoperable conditions (i.e., 114% unblocked).

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page 32 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 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

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page A-1 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final)

MBSP Maps

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page A-2 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0 10 20 30 40 50 60 70 80 90 100 110 0

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

Core Power (% Rated: 100% = 3952MWt)

Natural Circulation MELLLA Region ICF Region 20% Pump Speed Line Min. Pow er Line Min. Flow Control 87.5% Rod Line MELLLA Upper Boundary MELLLA+ Region Manual Scram Region I Controlled Entry Region II BSP Boundary 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)

EDMS: L94 200213 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 18, 2020 Browns Ferry Unit 3 Cycle 20 Page A-3 Core Operating Limits Report, (120% OLTP, MELLLA+)

TVA-COLR-BF3C20, Revision 0 (Final) 0 10 20 30 40 50 60 70 80 90 100 110 0

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

Core Power (% Rated: 100% = 3952MWt)

Natural Circulation MELLLA Region ICF Region 20% Pump Speed Line Min. Pow er Line Min. Flow Control 87.5% Rod Line MELLLA Upper Boundary MELLLA+ Region Controlled Entry Region II Manual Scram Region I BSP Boundary 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)

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