ML19064B304

Core Operating Limits Report for Cycle 21 Operation, Revision O

ML19064B304
Person / Time
Site:	Browns Ferry
Issue date:	03/05/2019
From:	Hughes D Tennessee Valley Authority
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
Download: ML19064B304 (49)

Text

Tennessee Valley Authority, Post Office Box 2000, Decatur, Alabama 35609-2000 March 5, 2019 10 CFR 50.4 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001

Subject:

Browns Ferry Nuclear Plant, Unit 2 Renewed Facility Operating License No. DPR-52 NRC Docket No. 50-260 Browns Ferry Nuclear Plant, Unit 2 Core Operating Limits Report for Cycle 21 Operation, Revision O 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 2, Cycle 21, Core Operating Limits Report (COLR). Revision O of the Unit 2 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 M. W. Oliver at (256) 729-7874.

D. L. Hughes Site Vice President

Enclosure:

Core Operating Limits Report, (120% OL TP), for Cycle 21 Operation, TVA-COLR-BF2C21, 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 2 Core Operating Limits Report, (120% OLTP), for Cycle 21 Operation, TVA-COLR-BF2C21, Revision 0 (See Attached)

USlNPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga, TN 37402 Browns Ferry Unit 2 Cycle 21 Core Operating Limits Report, 120°/o OL TP TV A-COLR-BF2C21 Revision O (Final)

(Revision Log, Page v)

February 2019 EDMS L94 190211 800 QA Document BFE-4400, Revision 0 Prepared c;'=l,.,_ LL V Date: ;:(_,/ 1.:2., o2 6lo/

T. W. Eichenberg, Sr. Specialist Verified:

Date:

.:s?t5". Mitchell, Engineer Approved: ~

Date: 2/zs/1~

W. B. Bird, Manager, BWR Fuel Engineering Reviewed: ~

Date: z/i5/ir D. D. Coffey, Manager, Reactor Engineering Approved: ~a~

Chairman, PORC~

Approved:

c. VUNt.J Plant Manag\\

Date:

o ;J... J;..-, }l'j Date: ____;:31 )...:....1 µ( 1_.!0, __

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page ii Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

Table of Contents Total Number of Pages = 47 (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......................................................................... 6 3

LHGR Limits......................................................................................................................... 7 3.1 Rated Power and Flow Limit: LHGRRATED..................................................................... 7 3.2 Off-Rated Power Dependent Limit: LHGRP.................................................................. 7 3.2.1 Startup without Feedwater Heaters....................................................................... 7 3.3 Off-Rated Flow Dependent Limit: LHGRF..................................................................... 8 3.4 Equipment Out-Of-Service Corrections......................................................................... 8 4

OLMCPR Limits................................................................................................................. 19 4.1 Flow Dependent MCPR Limit: MCPRF....................................................................... 19 4.2 Power Dependent MCPR Limit: MCPRP.................................................................... 19 4.2.1 Startup without Feedwater Heaters..................................................................... 19 4.2.2 Scram Speed Dependent Limits (TSSS vs. NSS vs. OSS)................................. 20 4.2.3 Exposure Dependent Limits................................................................................ 20 4.2.4 Equipment Out-Of-Service (EOOS) Options....................................................... 21 4.2.5 Single-Loop-Operation (SLO) Limits................................................................... 21 4.2.6 Below Pbypass Limits......................................................................................... 21 5

Oscillation Power Range Monitor (OPRM) Setpoint.......................................................... 33 6

APRM Flow Biased Rod Block Trip Settings...................................................................... 34 7

Rod Block Monitor (RBM) Trip Setpoints and Operability.................................................. 35 8

Shutdown Margin Limit....................................................................................................... 37

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page iii Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

List of Tables Nuclear Fuel Types

................................................................................................................... 2 Startup Feedwater Temperature Basis......................................................................................... 7 Nominal Scram Time Basis......................................................................................................... 20 MCPRP Limits for All Fuel Types: Optimum Scram Time Basis

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

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

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

Nominal Scram Time Basis

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

Nominal Scram Time Basis

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

Technical Specification Scram Time Basis

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

Technical Specification Scram Time Basis

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

...................... 32 OPRM Setpoint Range

............................................................................................................ 33 OPRM Successive Confirmation Count Setpoint........................................................................ 33 Analytical RBM Trip Setpoints

................................................................................................. 35 RBM Setpoint Applicability.......................................................................................................... 35 Control Rod Withdrawal Error Results........................................................................................ 36

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page iv Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

List of Figures APLHGRRATED for ATRIUM-10XM Fuel......................................................................................... 4 APLHGRRATED for ATRIUM-11 Fuel............................................................................................... 5 LHGRRATED for ATRIUM-10XM Fuel.............................................................................................. 9 LHGRRATED for ATRIUM-11 Fuel................................................................................................. 10 Base Operation LHGRFACP for ATRIUM-10XM Fuel................................................................. 11 Base Operation LHGRFACP for ATRIUM-11 Fuel...................................................................... 12 LHGRFACF for ATRIUM-10XM Fuel........................................................................................... 13 LHGRFACF for ATRIUM-11 Fuel................................................................................................ 14 Startup Operation LHGRFACP for ATRIUM-10XM Fuel: Table 3.1 Temperature Range 1........ 15 Startup Operation LHGRFACP for ATRIUM-10XM Fuel: Table 3.1 Temperature Range 2........ 16 Startup Operation LHGRFACP for ATRIUM-11 Fuel: Table 3.1 Temperature Range 1.............. 17 Startup Operation LHGRFACP for ATRIUM-11 Fuel: Table 3.1 Temperature Range 2.............. 18 MCPRF for All Fuel Types........................................................................................................... 22

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page v Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page vi Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

Nomenclature 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 EOC End of Cycle EOCLB End-of-Cycle Licensing Basis EOOS Equipment OOS 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)

MCPR Minimum CPR

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page vii Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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 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)

RPS Reactor Protection System RPT Recirculation Pump Trip RPTOOS RPT OOS 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page viii Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

References

1.

ANP-3737, Revision 0, Browns Ferry Unit 2 Cycle 21 Reload Analysis, Framatome, Inc., December 2018.

2.

ANP-3031P, Revision 3, Mechanical Design Report for Browns Ferry Units 1, 2, and 3 ATRIUM-10 Fuel Assemblies, AREVA NP, Inc., May 2014.

3.

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

4.

ANP-3706P, Revision 0, Browns Ferry Unit 2 Cycle 21 Plant Parameters Document, Framatome Inc., June 2018.

5.

BFE-4xxx, Revision 0, Browns Ferry Unit 2 Cycle 21 In Core Shuffle, Calculation File, Tennessee Valley Authority, February 2019.

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.

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page ix Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

15.

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

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 evaluation 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.

PRNM Setpoint References

26.

EDQ2092900118, R27, Setpoint and Scaling Calculation for Neutron Monitoring &

Recirculation Flow Loops, Calculation File, Tennessee Valley Authority, November 16, 2017.

27.

Task T0500, Revision 0, Neutron Monitoring System, Project Task Report, GE Hitachi Nuclear Energy, April 2015.

28.

Task T0506, Revision 2, TS Instrument Setpoints, Project Task Report, Tennessee Valley Authority, July 2015.

29.

NEDC-32433P, Maximum Extended Load Line Limit and ARTS Improvement Program Analyses for Browns Ferry Nuclear Plant Unit 1, 2, and 3, GE Nuclear Energy, April 1995.

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page x Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

30.

NEDO-32465-A, Licensing Topical Report - Reactor Stability Detect and Suppress Solutions Licensing Basis Methodology for Reload Applications, GE Nuclear Energy, August 1996.

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 1 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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)

Oscillation Power Range Monitor (OPRM) Setpoint (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 exposed ATRIUM-10XM, as well as a limited number of ATRIUM-11 lead fuel assemblies. 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 2 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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-3904B-15GV80-FBF 19 93 15 FBF401-FBF572 ATRIUM 10XM XMLC-4035B-13GV80-FBF 19 58 16 FBF573-FBF652 ATRIUM 11 A11-3693B-13GV80-FBF 19 6

17 FBF653-FBF660 ATRIUM 10XM XMLC-4102B-11GV70-FBG-B 20 48 18 FBG701-FBG748 ATRIUM 10XM XMLC-4062B-13GV80-FBG-C 20 151 19 FBG749-FBG900 ATRIUM 10XM XMLC-3948B-13GV70-FBG-B 20 88 20 FBG901-FBG988 ATRIUM-10XM XMLC-4087B-15GV80-FBH 21 176 21 FBH001-FBH176 ATRIUM-10XM XMLC-4036B-15GV80-FBH 21 88 22 FBH177-FBH264 ATRIUM-10XM XMLC-4093B-10GV80-FBh 21 56 23 FBH265-FBH320 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 3 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 fuel are shown in Figure 2.1. The rated conditions APLHGR for ATRIUM-11 are shown in Figure 2.2.

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-10 and ATRIUM-10XM fuel is 0.85, per Reference 1.

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 4 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 5 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 10 10.0 10 67.0 5.9 Figure 2.2 APLHGRRATED for ATRIUM-11 Fuel

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 6 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final) 2.5 Equipment Out-Of-Service Corrections The limits shown in Figure 2.1 and Figure 2.2 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

• 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.

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 7 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 are shown in Figure 3.1. The rated conditions LHGR for ATRIUM-11 fuel is shown in Figure 3.2. The LHGR limit is consistent with References 2 and 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 3.3 and Figure 3.4.

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 3.7 through Figure 3.10, based on temperature conditions identified in Table 3.1.

Table 3.1 Startup Feedwater Temperature Basis Power Range 1 Range 2

(% Rated)

(°F)

(°F) 23 155.0 150.0 30 162.0 157.0 40 172.0 167.0 50 182.0 177.0 Temperature

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 8 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 3.5 through Figure 3.6.

3.4 Equipment Out-Of-Service Corrections The limits shown in Figure 3.1 and Figure 3.2 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 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 3.3 and Figure 3.4 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 3.5 and Figure 3.6 are bounding for all EOOS conditions.

Off-rated power corrections shown in Figure 3.7 through Figure 3.10 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 9 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 10 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 12.2 18.9 12.2 74.4 6.4 Figure 3.2 LHGRRATED for ATRIUM-11 Fuel

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 11 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 0.62 26.0 0.61 26.0 0.45 26.0 0.38 23.0 0.42 23.0 0.35 26.0 0.48 26.0 0.48 23.0 0.45 23.0 0.43 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 3.3 Base Operation LHGRFACP for ATRIUM-10XM Fuel (Independent of other EOOS conditions)

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 12 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 0.62 26.0 0.61 26.0 0.45 26.0 0.38 23.0 0.42 23.0 0.35 26.0 0.48 26.0 0.48 23.0 0.45 23.0 0.43 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 Base Operation LHGRFACP for ATRIUM-11 Fuel (Independent of other EOOS conditions)

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 13 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final) 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 25 35 45 55 65 75 85 95 105 LHGRFACF Core Flow (% Rated)

Core Flow LHGRFACF

(% Rated) 0.0 0.63 30.0 0.63 76.6 1.00 107.0 1.00 Figure 3.5 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 14 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final) 0.60 0.65 0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 25 35 45 55 65 75 85 95 105 LHGRFACF Core Flow (% Rated)

Core Flow LHGRFACF

(% Rated) 0.0 0.66 30.0 0.66 73.7 1.00 107.0 1.00 Figure 3.6 LHGRFACF for ATRIUM-11 Fuel (Values bound all EOOS conditions)

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

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 15 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 0.51 26.0 0.51 26.0 0.39 26.0 0.34 23.0 0.36 23.0 0.31 26.0 0.41 26.0 0.41 23.0 0.41 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 3.7 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 16 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 0.51 26.0 0.51 26.0 0.39 26.0 0.34 23.0 0.35 23.0 0.30 26.0 0.41 26.0 0.41 23.0 0.40 23.0 0.38 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 3.8 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 17 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 0.51 26.0 0.51 26.0 0.39 26.0 0.34 23.0 0.36 23.0 0.31 26.0 0.41 26.0 0.41 23.0 0.41 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 3.9 Startup Operation LHGRFACP for ATRIUM-11 Fuel:

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

(Limits valid at and below 50% power)

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 18 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 0.51 26.0 0.51 26.0 0.39 26.0 0.34 23.0 0.35 23.0 0.30 26.0 0.41 26.0 0.41 23.0 0.40 23.0 0.38 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 3.10 Startup Operation LHGRFACP for ATRIUM-11 Fuel:

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

(Limits valid at and below 50% power)

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 19 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 20 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 0.420 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 29,305.7 MWd / MTU BOC to EOCLB EOCLB corresponds to 34,273.7 MWd / MTU BOC to End of Coast End of Coast 35,998.1 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 21 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 22 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 23 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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

• BOC BOC BOC BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.37 1.39 1.41 1.36 1.42 1.43 90 1.42 1.43 1.46 1.42 1.45 1.47 65 1.59 1.59 1.63 1.58 1.58 1.64 50 1.68 1.68 1.75 1.73 1.73 1.81 50 1.81 1.81 1.81 1.91 1.91 1.91 40 1.88 1.88 1.91 1.99 1.99 2.03 26 2.30 2.30 2.42 2.51 2.51 2.66 26 at > 50%F 2.54 2.54 2.65 2.68 2.68 2.81 23 at > 50%F 2.69 2.69 2.81 2.93 2.93 3.05 26 at 50%F 2.42 2.42 2.51 2.63 2.63 2.72 23 at 50%F 2.55 2.55 2.67 2.93 2.93 3.05 100 1.41 1.41 1.40 1.43 90 1.46 1.46 1.45 1.47 65 1.63 1.63 1.64 1.64 50 1.75 1.75 1.81 1.81 50 1.81 1.81 1.91 1.91 40 1.91 1.91 2.03 2.03 26 2.42 2.42 2.66 2.66 26 at > 50%F 2.65 2.65 2.81 2.81 23 at > 50%F 2.81 2.81 3.05 3.05 26 at 50%F 2.51 2.51 2.72 2.72 23 at 50%F 2.67 2.67 3.05 3.05 ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 24 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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

• BOC BOC BOC BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.40 1.41 1.44 1.40 1.43 1.45 90 1.45 1.46 1.49 1.45 1.47 1.49 65 1.61 1.61 1.66 1.61 1.61 1.67 50 1.71 1.71 1.77 1.76 1.76 1.84 50 1.81 1.81 1.81 1.92 1.92 1.92 40 1.88 1.88 1.94 2.00 2.00 2.06 26 2.33 2.33 2.45 2.55 2.55 2.69 26 at > 50%F 2.54 2.54 2.65 2.68 2.68 2.81 23 at > 50%F 2.69 2.69 2.81 2.93 2.93 3.05 26 at 50%F 2.42 2.42 2.51 2.63 2.63 2.72 23 at 50%F 2.55 2.55 2.67 2.93 2.93 3.05 100 1.43 1.44 1.46 1.45 1.49 1.49 90 1.48 1.49 1.52 1.49 1.52 1.54 65 1.64 1.64 1.69 1.65 1.65 1.69 50 1.73 1.73 1.78 1.78 1.78 1.85 50 1.81 1.81 1.81 1.92 1.92 1.92 40 1.88 1.88 1.94 2.00 2.00 2.06 26 2.33 2.33 2.45 2.55 2.55 2.69 26 at > 50%F 3.11 3.11 3.23 3.28 3.28 3.38 23 at > 50%F 3.35 3.35 3.47 3.57 3.57 3.69 26 at 50%F 2.78 2.78 2.90 3.04 3.04 3.16 23 at 50%F 3.04 3.04 3.18 3.32 3.32 3.56 100 1.44 1.44 1.43 1.45 90 1.49 1.49 1.48 1.49 65 1.66 1.66 1.67 1.67 50 1.77 1.77 1.84 1.84 50 1.81 1.81 1.92 1.92 40 1.94 1.94 2.06 2.06 26 2.45 2.45 2.69 2.69 26 at > 50%F 2.65 2.65 2.81 2.81 23 at > 50%F 2.81 2.81 3.05 3.05 26 at 50%F 2.51 2.51 2.72 2.72 23 at 50%F 2.67 2.67 3.05 3.05 100 1.40 1.41 1.44 1.40 1.44 1.45 90 1.45 1.46 1.49 1.45 1.47 1.49 65 1.73 1.73 1.73 1.83 1.83 1.83 50 50 1.81 1.81 1.81 1.92 1.92 1.92 40 1.88 1.88 1.94 2.00 2.00 2.06 26 2.33 2.33 2.45 2.55 2.55 2.69 26 at > 50%F 2.54 2.54 2.65 2.68 2.68 2.81 23 at > 50%F 2.69 2.69 2.81 2.93 2.93 3.05 26 at 50%F 2.42 2.42 2.51 2.63 2.63 2.72 23 at 50%F 2.55 2.55 2.67 2.93 2.93 3.05 ATRIUM-10XM ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 25 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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

• BOC BOC BOC BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.46 1.46 1.47 1.49 90 1.52 1.52 1.52 1.54 65 1.69 1.69 1.69 1.69 50 1.78 1.78 1.85 1.85 50 1.81 1.81 1.92 1.92 40 1.94 1.94 2.06 2.06 26 2.45 2.45 2.69 2.69 26 at > 50%F 3.23 3.23 3.38 3.38 23 at > 50%F 3.47 3.47 3.69 3.69 26 at 50%F 2.90 2.90 3.16 3.16 23 at 50%F 3.18 3.18 3.56 3.56 100 1.43 1.44 1.46 1.45 1.49 1.49 90 1.48 1.49 1.52 1.49 1.52 1.54 65 1.73 1.73 1.73 1.83 1.83 1.83 50 50 1.81 1.81 1.81 1.92 1.92 1.92 40 1.88 1.88 1.94 2.00 2.00 2.06 26 2.33 2.33 2.45 2.55 2.55 2.69 26 at > 50%F 3.11 3.11 3.23 3.28 3.28 3.38 23 at > 50%F 3.35 3.35 3.47 3.57 3.57 3.69 26 at 50%F 2.78 2.78 2.90 3.04 3.04 3.16 23 at 50%F 3.04 3.04 3.18 3.32 3.32 3.56 100 1.44 1.44 1.43 1.45 90 1.49 1.49 1.48 1.49 65 1.73 1.73 1.83 1.83 50 50 1.81 1.81 1.92 1.92 40 1.94 1.94 2.06 2.06 26 2.45 2.45 2.69 2.69 26 at > 50%F 2.65 2.65 2.81 2.81 23 at > 50%F 2.81 2.81 3.05 3.05 26 at 50%F 2.51 2.51 2.72 2.72 23 at 50%F 2.67 2.67 3.05 3.05 100 1.46 1.46 1.47 1.49 90 1.52 1.52 1.52 1.54 65 1.73 1.73 1.83 1.83 50 50 1.81 1.81 1.92 1.92 40 1.94 1.94 2.06 2.06 26 2.45 2.45 2.69 2.69 26 at > 50%F 3.23 3.23 3.38 3.38 23 at > 50%F 3.47 3.47 3.69 3.69 26 at 50%F 2.90 2.90 3.16 3.16 23 at 50%F 3.18 3.18 3.56 3.56 ATRIUM-10XM ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 26 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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

• BOC BOC BOC BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.43 1.43 1.47 1.43 1.45 1.46 90 1.48 1.48 1.52 1.47 1.49 1.51 65 1.63 1.63 1.68 1.64 1.64 1.70 50 1.73 1.73 1.80 1.79 1.79 1.86 50 1.82 1.82 1.82 1.93 1.93 1.93 40 1.89 1.89 1.96 2.01 2.01 2.08 26 2.35 2.35 2.47 2.57 2.57 2.72 26 at > 50%F 2.54 2.54 2.65 2.68 2.68 2.81 23 at > 50%F 2.69 2.69 2.81 2.93 2.93 3.05 26 at 50%F 2.42 2.42 2.51 2.63 2.63 2.72 23 at 50%F 2.55 2.55 2.67 2.93 2.93 3.05 100 1.46 1.47 1.49 1.48 1.51 1.51 90 1.51 1.51 1.54 1.52 1.54 1.56 65 1.66 1.66 1.71 1.67 1.67 1.72 50 1.75 1.75 1.81 1.81 1.81 1.88 50 1.82 1.82 1.82 1.93 1.93 1.93 40 1.89 1.89 1.96 2.01 2.01 2.09 26 2.36 2.36 2.47 2.57 2.57 2.72 26 at > 50%F 3.11 3.11 3.23 3.28 3.28 3.38 23 at > 50%F 3.35 3.35 3.47 3.57 3.57 3.69 26 at 50%F 2.78 2.78 2.90 3.04 3.04 3.16 23 at 50%F 3.04 3.04 3.18 3.32 3.32 3.56 100 1.47 1.47 1.45 1.46 90 1.52 1.52 1.51 1.51 65 1.68 1.68 1.70 1.70 50 1.80 1.80 1.86 1.86 50 1.82 1.82 1.93 1.93 40 1.96 1.96 2.08 2.08 26 2.47 2.47 2.72 2.72 26 at > 50%F 2.65 2.65 2.81 2.81 23 at > 50%F 2.81 2.81 3.05 3.05 26 at 50%F 2.51 2.51 2.72 2.72 23 at 50%F 2.67 2.67 3.05 3.05 100 1.43 1.43 1.47 1.43 1.45 1.49 90 1.48 1.48 1.52 1.47 1.49 1.51 65 1.74 1.74 1.74 1.84 1.84 1.84 50 50 1.82 1.82 1.82 1.93 1.93 1.93 40 1.89 1.89 1.96 2.01 2.01 2.08 26 2.35 2.35 2.47 2.57 2.57 2.72 26 at > 50%F 2.54 2.54 2.65 2.68 2.68 2.81 23 at > 50%F 2.69 2.69 2.81 2.93 2.93 3.05 26 at 50%F 2.42 2.42 2.51 2.63 2.63 2.72 23 at 50%F 2.55 2.55 2.67 2.93 2.93 3.05 ATRIUM-10XM ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 27 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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

• BOC BOC BOC BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.49 1.49 1.50 1.51 90 1.54 1.54 1.55 1.56 65 1.71 1.71 1.72 1.72 50 1.81 1.81 1.88 1.88 50 1.82 1.82 1.93 1.93 40 1.96 1.96 2.09 2.09 26 2.47 2.47 2.72 2.72 26 at > 50%F 3.23 3.23 3.38 3.38 23 at > 50%F 3.47 3.47 3.69 3.69 26 at 50%F 2.90 2.90 3.16 3.16 23 at 50%F 3.18 3.18 3.56 3.56 100 1.46 1.47 1.49 1.48 1.51 1.51 90 1.51 1.51 1.54 1.52 1.54 1.56 65 1.74 1.74 1.74 1.84 1.84 1.84 50 50 1.82 1.82 1.82 1.93 1.93 1.93 40 1.89 1.89 1.96 2.01 2.01 2.09 26 2.36 2.36 2.47 2.57 2.57 2.72 26 at > 50%F 3.11 3.11 3.23 3.28 3.28 3.38 23 at > 50%F 3.35 3.35 3.47 3.57 3.57 3.69 26 at 50%F 2.78 2.78 2.90 3.04 3.04 3.16 23 at 50%F 3.04 3.04 3.18 3.32 3.32 3.56 100 1.47 1.47 1.45 1.46 90 1.52 1.52 1.51 1.51 65 1.74 1.74 1.84 1.84 50 50 1.82 1.82 1.93 1.93 40 1.96 1.96 2.08 2.08 26 2.47 2.47 2.72 2.72 26 at > 50%F 2.65 2.65 2.81 2.81 23 at > 50%F 2.81 2.81 3.05 3.05 26 at 50%F 2.51 2.51 2.72 2.72 23 at 50%F 2.67 2.67 3.05 3.05 100 1.49 1.49 1.50 1.51 90 1.54 1.54 1.55 1.56 65 1.74 1.74 1.84 1.84 50 50 1.82 1.82 1.93 1.93 40 1.96 1.96 2.09 2.09 26 2.47 2.47 2.72 2.72 26 at > 50%F 3.23 3.23 3.38 3.38 23 at > 50%F 3.47 3.47 3.69 3.69 26 at 50%F 2.90 2.90 3.16 3.16 23 at 50%F 3.18 3.18 3.56 3.56 ATRIUM-10XM ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 28 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.44 1.44 1.44 1.43 1.45 1.45 90 1.49 1.49 1.49 1.48 1.49 1.49 65 1.73 1.73 1.73 1.83 1.83 1.83 50 50 1.93 1.93 1.93 2.02 2.02 2.02 40 2.16 2.16 2.16 2.29 2.29 2.29 26 2.77 2.77 2.77 3.07 3.07 3.07 26 at > 50%F 3.06 3.06 3.06 3.12 3.12 3.12 23 at > 50%F 3.15 3.15 3.15 3.42 3.42 3.42 26 at 50%F 2.79 2.79 2.79 3.07 3.07 3.07 23 at 50%F 3.01 3.01 3.01 3.37 3.37 3.37 100 1.46 1.46 1.46 1.47 1.49 1.49 90 1.52 1.52 1.52 1.52 1.54 1.54 65 1.73 1.73 1.73 1.83 1.83 1.83 50 50 1.93 1.93 1.93 2.02 2.02 2.02 40 2.16 2.16 2.16 2.29 2.29 2.29 26 2.77 2.77 2.77 3.07 3.07 3.07 26 at > 50%F 3.55 3.55 3.55 3.60 3.60 3.60 23 at > 50%F 3.71 3.71 3.71 4.00 4.00 4.00 26 at 50%F 3.14 3.14 3.14 3.39 3.39 3.39 23 at 50%F 3.45 3.45 3.45 3.89 3.89 3.89 ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 29 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.44 1.44 1.44 1.43 1.45 1.45 90 1.49 1.49 1.49 1.48 1.49 1.49 65 1.73 1.73 1.73 1.83 1.83 1.83 50 50 1.94 1.94 1.94 2.02 2.02 2.02 40 2.17 2.17 2.17 2.30 2.30 2.30 26 2.79 2.79 2.79 3.09 3.09 3.09 26 at > 50%F 3.09 3.09 3.09 3.14 3.14 3.14 23 at > 50%F 3.17 3.17 3.17 3.44 3.44 3.44 26 at 50%F 2.81 2.81 2.81 3.09 3.09 3.09 23 at 50%F 3.03 3.03 3.03 3.39 3.39 3.39 100 1.46 1.46 1.46 1.47 1.49 1.49 90 1.52 1.52 1.52 1.52 1.54 1.54 65 1.73 1.73 1.73 1.83 1.83 1.83 50 50 1.94 1.94 1.94 2.02 2.02 2.02 40 2.17 2.17 2.17 2.30 2.30 2.30 26 2.79 2.79 2.79 3.09 3.09 3.09 26 at > 50%F 3.58 3.58 3.58 3.62 3.62 3.62 23 at > 50%F 3.73 3.73 3.73 4.02 4.02 4.02 26 at 50%F 3.15 3.15 3.15 3.40 3.40 3.40 23 at 50%F 3.46 3.46 3.46 3.90 3.90 3.90 ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 30 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.47 1.47 1.47 1.45 1.46 1.49 90 1.52 1.52 1.52 1.51 1.51 1.51 65 1.74 1.74 1.74 1.84 1.84 1.84 50 50 1.96 1.96 1.96 2.04 2.04 2.04 40 2.18 2.18 2.18 2.32 2.32 2.32 26 2.79 2.79 2.79 3.10 3.10 3.10 26 at > 50%F 3.06 3.06 3.06 3.12 3.12 3.12 23 at > 50%F 3.15 3.15 3.15 3.42 3.42 3.42 26 at 50%F 2.79 2.79 2.79 3.10 3.10 3.10 23 at 50%F 3.01 3.01 3.01 3.40 3.40 3.40 100 1.49 1.49 1.49 1.50 1.51 1.51 90 1.54 1.54 1.54 1.55 1.56 1.56 65 1.74 1.74 1.74 1.84 1.84 1.84 50 50 1.96 1.96 1.96 2.05 2.05 2.05 40 2.18 2.18 2.18 2.32 2.32 2.32 26 2.79 2.79 2.79 3.10 3.10 3.10 26 at > 50%F 3.55 3.55 3.55 3.60 3.60 3.60 23 at > 50%F 3.71 3.71 3.71 4.00 4.00 4.00 26 at 50%F 3.14 3.14 3.14 3.39 3.39 3.39 23 at 50%F 3.45 3.45 3.45 3.89 3.89 3.89 ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 31 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 BOC BOC BOC Pow er to to to End of to to to End of

(% of rated)

NEOC EOCLB Coast NEOC EOCLB Coast 100 1.47 1.47 1.47 1.45 1.46 1.49 90 1.52 1.52 1.52 1.51 1.51 1.51 65 1.74 1.74 1.74 1.84 1.84 1.84 50 50 1.96 1.96 1.96 2.05 2.05 2.05 40 2.19 2.19 2.19 2.33 2.33 2.33 26 2.81 2.81 2.81 3.12 3.12 3.12 26 at > 50%F 3.09 3.09 3.09 3.14 3.14 3.14 23 at > 50%F 3.17 3.17 3.17 3.44 3.44 3.44 26 at 50%F 2.81 2.81 2.81 3.12 3.12 3.12 23 at 50%F 3.03 3.03 3.03 3.42 3.42 3.42 100 1.49 1.49 1.49 1.50 1.51 1.51 90 1.54 1.54 1.54 1.55 1.56 1.56 65 1.74 1.74 1.74 1.84 1.84 1.84 50 50 1.96 1.96 1.96 2.05 2.05 2.05 40 2.19 2.19 2.19 2.33 2.33 2.33 26 2.81 2.81 2.81 3.12 3.12 3.12 26 at > 50%F 3.58 3.58 3.58 3.62 3.62 3.62 23 at > 50%F 3.73 3.73 3.73 4.02 4.02 4.02 26 at 50%F 3.15 3.15 3.15 3.40 3.40 3.40 23 at 50%F 3.46 3.46 3.46 3.90 3.90 3.90 ATRIUM-11 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 32 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

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

• Pow er

(% of rated)

ATRIUM-10XM ATRIUM-11 100 2.00 2.05 43.75 2.00 2.05 40 2.00 2.10 26 2.49 2.74 26 at > 50%F 2.67 2.83 23 at > 50%F 2.83 3.07 26 at 50%F 2.53 2.74 23 at 50%F 2.69 3.07 100 2.00 2.05 43.75 2.00 2.05 40 2.00 2.11 26 2.49 2.74 26 at > 50%F 3.25 3.40 23 at > 50%F 3.49 3.71 26 at 50%F 2.92 3.18 23 at 50%F 3.20 3.58 100 2.12 2.24 43.75 2.12 2.24 40 2.20 2.34 26 2.81 3.12 26 at > 50%F 3.57 3.62 23 at > 50%F 3.73 4.02 26 at 50%F 3.16 3.41 23 at 50%F 3.47 3.91 100 2.13 2.25 43.75 2.13 2.25 40 2.21 2.35 26 2.83 3.14 26 at > 50%F 3.60 3.64 23 at > 50%F 3.75 4.04 26 at 50%F 3.17 3.42 23 at 50%F 3.48 3.92 RCPOOS TBVOOS FHOOS2 All Cycle Exposures 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 33 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final) 5 Oscillation Power Range Monitor (OPRM) Setpoint (Technical Specification 3.3.1.1)

Technical Specification Table 3.3.1.1-1, Function 2f, identifies the OPRM upscale 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. An Option III stability analysis is performed for each reload core to determine allowable OLMCPRs as a function of OPRM setpoint. Analyses consider both steady state startup operation, and the case of a two recirculation pump trip from rated power.

The resulting stability based OLMCPRs are reported in Reference 1. The OPRM setpoint (sometimes referred to as the Amplitude Trip, Sp) is selected, such that required margin to the SLMCPR is provided without stability being a limiting event. Analyses are based on cycle specific DIVOM analyses performed per Reference 22. The calculated OLMCPRs are shown in Table 5.1. Review of results shown in COLR Table 4.2 indicates an OPRM setpoint of 1.14 may be used. The successive confirmation count (sometimes referred to as Np) is provided in Table 5.2, per Reference 30.

Table 5.1 OPRM Setpoint Range

• Table 5.2 OPRM Successive Confirmation Count Setpoint OPRM OLMCPR OLMCPR Setpoint (SS)

(2PT) 1.05 1.15 1.07 1.06 1.17 1.08 1.07 1.19 1.10 1.08 1.20 1.12 1.09 1.22 1.14 1.10 1.24 1.16 1.11 1.26 1.17 1.12 1.28 1.19 1.13 1.30 1.21 1.14 1.33 1.23 1.15 1.35 1.25 Count 6

1.04 8

1.05 10 1.07 12 1.09 14 1.11 16 1.14 18 1.18 20 1.24 OPRM Setpoint

• Extrapolation beyond a setpoint of 1.15 is not allowed

EDMS: L94 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 34 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 26 & 28, and is defined by the following:

SRB (0.55(W-W) + 60.5%)

Allowable Value SRB (0.55(W-W) + 58.5%)

Nominal Trip Setpoint (NTSP) where:

SRB

=

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

W

=

Loop recirculation flow rate in percent of rated 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 35 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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 26 & 27, 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 26, 27, 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%

< 1.66 (a), (b), (f), (h) two loop operation

< 1.70 (a), (b), (f), (h) single loop operation 90%

< 1.36 (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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 36 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, Revision 0 (Final)

Table 7.3 Control Rod Withdrawal Error Results RBM CRWE HTSP Analytical Limit OLMCPR Unfiltered 107 1.29 111 1.32 114 1.33 117 1.34 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 190211 800 NPG Reactor Engineering and Fuels - BWRFE 1101 Market Street, Chattanooga TN 37402 Date: February 12, 2019 Browns Ferry Unit 2 Cycle 21 Page 37 Core Operating Limits Report, 120% OLTP TVA-COLR-BF2C21, 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