ML22306A144
| ML22306A144 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 10/19/2022 |
| From: | Mcclure K Constellation Energy Generation |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML22306A142 | List: |
| References | |
| CCN 22-82 COLR PEACH BOTTOM 2, Rev. 18 | |
| Download: ML22306A144 (33) | |
Text
Constellation Energy Generation - Nuclear Fuels COLR PEACH BOTTOM 2 Rev. 18 P2C25 Core Operating Limits Report Page 1 of 33
CORE OPERATING LIMITS REPORT FOR
PEACH BOTTOM ATOMIC POWER STATION UNIT 2
RELOAD 24, CYCLE 25
Prepared By: Date:
K. McClure - Cycle Management
Reviewed By: Date:
E.J. Vaughn - Cycle Management
Reviewed By: Date:
C. Wolff - Engineering Safety Analysis
Reviewed By: Date:
T. Mitchell - Reactor Engineering
Approved By: Date:
J. Bernhardt - Acting NF Sr. Manager
Station Qualified Reviewer: Date:
J. Holley - SQR
Constellation Energy Generation - Nuclear Fuels COLR PEACH BOTTOM 2 Rev. 18 P2C25 Core Operating Limits Report Page 2 of 33
Table of Contents Page
Revision History 3
List of Tables 4
1.0 Terms and Definitions 6
2.0 General Information 8
3.0 MAPLHGR Limits 9
4.0 MCPR Limits 10
5.0 LHGR Limits 15
6.0 Rod Block Monitor Setpoints 19
7.0 Turbine Bypass Valve Parameters 20
8.0 EOC Recirculation Pump Trip (EOC -RPT) Operability 21
9.0 Stability Protection 22
10.0 Asymmetric Feedwater Temperature Operation (AFTO) 24
11.0 Modes of Operation 31
12.0 Methodology 32
13.0 References 32
Appendix A: Power/Flow Operating Map for MELLLA+ with TPO 33
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Revision History
Revision Description
Revision 18 Initial Issuance for Cycle 25
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List of Tables Page Table 3-1 MAPLHGR Versus Average Planar Exposure - GNF2 Fuel 9 Table 3-2 MAPLHGR Versus Average Planar Exposure - GNF3 Fuel 9 Table 3-3 MAPLHGR Single Loop Operation (SLO) Multiplier 9 Table 4-1 Operating Limit Minimum Critical Power Ratio (Symmetric Feedwater Heating) - All 11 Fuel Types Table 4-2 Power Dependent MCPR(P) Limit Adjustments and Multipliers (Symmetric Feedwater 12 Heating) - All Fuel Types Table 4-3 Flow Dependent MCPR Limits MCPR(F) (Symmetric Feedwater Heating) - GNF2 Fuel 13 Table 4-4 Flow Dependent MCPR Limits MCPR(F) (Symmetric Feedwater Heating) - GNF3 Fuel 13 Table 4-5 SLO Flow Dependent MCPR Limits MCPR(F) (Symmetric Feedwater Heating) - GNF2 13 Fuel Table 4-6 SLO Flow Dependent MCPR Limits MCPR(F) (Symmetric Feedwater Heating) - GNF3 14 Fuel Table 4-7 Cycle Specific SLMCPR (MCPR99.9%) - All Fuel Types 14 Table 5-1 Linear Heat Generation Rate Limits - UO2 Rods 15 Table 5-2 Linear Heat Generation Rate Limits - Gad Rods 15 Table 5-3 Power Dependent LHGR Multiplier LHGRFAC(P) (Symmetric Feedwater Heating) - 16 GNF2 Fuel Table 5-4 Power Dependent LHGR Multiplier LHGRFAC(P) (Symmetric Feedwater Heating) - 17 GNF3 Fuel Table 5-5 Power Dependent LHGR Multiplier LHGRFAC(P) Asymmetric Loss of Feedwater 17 Heating Table 5-6 Flow Dependent LHGR Multiplier LHGRFAC(F) (Symmetric Feedwater Heating) - 18 GNF2 Fuel Table 5-7 Flow Dependent LHGR Multiplier LHGRFAC(F) (Symmetric Feedwater Heating) - 18 GNF3 Fuel Table 6-1 Rod Block Monitor Setpoints - All Fuel Types 19 Table 7-1 Turbine Bypass System Response Time 20 Table 7-2 Minimum Required Bypass Valves to Maintain System Operability 20 Table 8-1 Recirculation Pump Trip Response Time 21 Table 9-1 Automated BSP Setpoints for the Scram Region 22 Table 9-2 Manual BSP Endpoints for Normal Feedwater Temperature 23 Table 9-3 Manual BSP Endpoints for Reduced Feedwater Temperature 23 Table 10-1 AFTO MAPLHGR Reduction Factor - All Fuel Types 24 Table 10-2 AFTO Operating Limit Minimum Critical Power Ratio 20 F < FWT DELTA 55F - All 25 Fuel Types Table 10-3 AFTO Power Dependent MCPR Limit Adjustments and Multipliers MCPR(P) 26 20F < FWT DELTA 55F - All Fuel Types
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Table 10-4 AFTO Flow Dependent MCPR Limits MCPR(F) 20F < FWT DELTA 55F - GNF2 Fuel 27 Table 10-5 AFTO Flow Dependent MCPR Limits MCPR(F) 20 F < FWT DELTA 55F - GNF3 Fuel 27 Table 10-6 AFTO Power Dependent LHGR Multiplier LHGRFAC(P) 20 F < FWT DELTA 55F - 28 GNF2 Fuel Table 10-7 AFTO Power Dependent LHGR Multiplier LHGRFAC(P) 20 F < FWT DELTA 55F - 29 GNF3 Fuel Table 10-8 AFTO Flow Dependent LHGR Multiplier LHGRFAC(F) 20 F < FWT DELTA 55 F - 30 GNF2 Fuel Table 10-9 AFTO Flow Dependent LHGR Multiplier LHGRFAC(F) 20 F < FWT DELTA 55 F - 30 GNF3 Fuel Table 11-1 Modes of Operation 31 Table 11-2 EOOS Option s Included in 'Base' Condition 31 Table 11-3 Power Level Restrictions 31
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1.0 TERMS AND DEFINITIONS ABSP Automated Backup Stability Protection AFTO Asymmetric Feedwater Temperature Operation APRM Average Power Range Monitor ARTS APRM, Rod Block and Technical Specification Improvement Program BASE The condition defined by a group of individual operating conditions that are applicable to all Modes of Operation discussed in Section 11.
BSP Backup Stability Protection DLO Dual Loop Operation DSS-CD Detect and Suppress Solution - Confirmation Density ECCS-LOCA Emergency Core Cooling System - Loss of Coolant Accident EOC End of Cycle EOC-RPT End of Cycle Recirculation Pump Trip EOOS Equipment Out of Service. An analyzed option that assumes certain equipment to be non-operational EOR End of Rated. The cycle exposure at which reactor power is equal to 100% with recirculation system flow equal to 100%, all control rods fully withdrawn, all feedwater heating in service and equilibrium Xenon.
FFWTR Final Feedwater Temperature Reduction FWHOOS Feedwater Heater(s) Out of Service FWT Feedwater Temperature GE General Electric GNF Global Nuclear Fuel HFCL High Flow Control Line HTSP Rod Block Monitor High Trip Setpoint ITSP Rod Block Monitor Intermediate Trip Setpoint KP Off-rated power dependent OLMCPR multiplier LHGR Linear Heat Generation Rate LHGRFAC(F) Off-rated flow dependent LHGR multiplier LHGRFAC(P) Off-rated power dependent LHGR multiplier LTSP Rod Block Monitor Low Trip Setpoint MAPLHGR Maximum Average Planar Linear Heat Genera tion Rate MCPR Minimum Critical Power Ratio MCPR99.9% Limiting MCPR value such that 99.9% of the fuel in the core is not susceptible to boiling transition MCPR(F) Off-rated flow dependent OLMCPR MCPR(P) Off-rated power dependent OLMCPR MELLLA Maximum Extended Load Line Limit Analysis MELLLA+ Maximum Extended Load Line Limit Analysis Plus MSIVOOS Main Steam Isolation Valve Out of Service NCL Natural Circulation Line NRC Nuclear Regulatory Commission OLMCPR Operating Limit Minimum Critical Power Ratio PLUOOS Power Load Unbalance Out of Service PROOS Pressure Regulator Out of Service
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PR/PLUOOS Pressure Regulator and/or Power Load Unbalance Out of Service RBM Rod Block Monitor RDF Recirculation Drive Flow RPT Recirculation Pump Trip RPTOOS Recirculation Pump Trip Out of Service RTP Rated Thermal Power RWE Rod Withdrawal Error SAD Amplitude Discriminator Setpoint SFTO Symmetric Feedwater Temperature Operation SLMCPR Safety Limit Minimum Critical Power Ratio SLO Single Loop Operation SRVOOS Safety Relief Valve Out of Service Tau () A measure of scream time performance to notch position 36 throughout the cycle TBSOOS Turbine Bypass System Out of Service TBVOOS Turbine Bypass Valve Out of Service TCVSC Turbine Control Valve Slow Closure TCV/TSVOOS Turbine Control Valve and/or Turbine Stop Valve Out of Service TPO Thermal Power Optimization, also known as Measurement Uncertainty Recapture (MUR)
TS Technical Specification
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2.0 GENERAL INFORMATION
This report provides the following cycle-specific parameter limits for Peach Bottom Atomic Power Station Unit 2 CYCLE 25 (RELOAD 24):
- Maximum Average Planar Linear Heat Generation Rate (MAPLHGR)
- Operating Limit Minimum Critical Power Ratio (OLMCPR)
- MCPR99.9%
- Linear Heat Generation Rate (LHGR)
- Turbine Bypass Valve Parameters
- Stability Protection Setpoints
- Asymmetric Feedwater Temperature Operation (AFTO) thermal limit penalties
- Power Level Restriction s
These values have been determined using NRC -approved methodology and are established such that all applicable limits of the plant safety analysis are met. SLO, FWHOOS operation, and FFWTR operation are not permitted in the MELLLA+ Region as controlled by station procedures. For the MELLLA+ Region, a specific definition of FWHOOS is provided in Facility Operating License Section 2.C(16). Operation in the MELLLA+ Region with up to a 10°F reduction in feedwater temperature below the design feedwater temperature is permitted.
This report provides cycle-specific OLMCPR, LHGR, and MAPLHGR thermal limits and related information for the following conditions (Reference 2):
- All points in the operating region of the power/flow map including the MELLLA+ Region down to 85.2%
of rated core flow during full power (4016 MWt) operation (Appendix A)
- Increased Core Flow, up to 110% of rated core flow
- End-of-Cycle Power Coastdown to a minimum power level of 40%
- Feedwater Heaters Out of Service (FWHOOS) up to 55° F temperature reduction
- Final Feedwater Temperature Reduction (FFWTR) between End -of-Rated (EOR) and End-of-Cycle (EOC) up to 90° F temperature reduction (4th and 5th stage FWHOOS)
- Asymmetric Feedwater Temperature Operation (AFTO)
- Equipment Out of Service Conditions per Section 11
ARTS provides power - and flow-dependent thermal limit adjustments and multipliers that allow for a more reliable administration of the MCPR and LHGR thermal limits. The off-rated limits assumed in the ECCS-LOCA analyses bound the cycle-specific off-rated limits calculated for MELLLA+ operation. Linear interpolation is to be used to find intermediate values unless otherwise indicated. The Allowable Values documented in Reference 5 for feedwater temperature as a function of thermal power for both FWHOOS and FFWTR are specified in the appropriate Peach Bottom procedures. The Peach Bottom Unit 2 Cycle 2 5 core is comprised of GNF2 and GNF3 fuel.
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3.0 MAPLHGR LIMITS
3.1 Technical Specification Section 3.2.1, 3.3.4.2, 3.4.1 and 3.7.6
3.2 Description
The limiting MAPLHGR value for the most limiting lattice as a function of average planar exposure is given in Table 3-1 for GNF2 fuel and Table 3-2 for GNF3 fuel. For SLO, a multiplier is used, which is shown in Table 3-3 for both GNF2 and GNF3 fuel. The impact of AFTO on MAPLHGR is addressed in Section 10.0. The power and flow dependent LHGR multipliers are sufficient to provide adequate protection for the off-rated conditions from an ECCS-LOCA analysis perspective. The MAPLHGR multipliers can either be set to one or set equal to the LHGR multipliers, which remain compliant with the basis of the ECCS-LOCA analysis with no loss of ECCS-LOCA margin.
TABLE 3-1 MAPLHGR Versus Average Planar Exposure GNF2 Fuel (Reference 2)
Average Planar Exposure MAPLHGR Limit (GWD/ST) (kW/ft) 0.0 13.78 17.52 13.78 60.78 7.50 63.50 6.69
TABLE 3-2 MAPLHGR Versus Average Planar Exposure GNF3 Fuel (Reference 2)
Average Planar Exposure MAPLHGR Limit (GWD/ST) (kW/ft) 0.0 14.36 21.22 13.01 40.82 10.75 57.60 8.00 63.50 6.00
TABLE 3-3 MAPLHGR Single Loop Operation (SLO) Multiplier (Reference 2)
GNF2 SLO Multiplier 0.73 GNF3 SLO Multiplier 0.90
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4.0 MCPR LIMITS
4.1 Technical Specification Section 2.1.1.2, 3.2.2, 3.3.4.2, 3.4.1 and 3.7.6
4.2 Description
The OLMCPR is provided in Table 4-1 for all fuel types. These values are determined by the cycle-specific fuel reload analyses in Reference 2. Control rod scram time verification is required per Technical Specification 3.1.4, "Control Rod Scram Times". Tau (), a measure of scram time performance to notch position 36 throughout the cycle, is determined based on the cumulative scram time test results. The calculation of Tau shall be performed in accordance with site procedures. Linear interpolation shall be used to calculate the OLMCPR value if Tau is between 0.0 (Tau Option B) and 1.0 (Tau Option A). Table 4-1 is valid for the entire range of licensed flow and feedwater temperature (Reference 2).
The ARTS-based power-dependent MCPR limits (MCPR(P)) and multipliers (K p) are provided in Table 4-
- 2. Table 4-2 is valid for a maximum temperature reduction of 90F for FFWTR operation (bounding for FWHOOS operation) (Reference 2). The flow-dependent MCPR limits (MCPR(F)) are provided in Tables 4-3 through 4-6. Tables 4-3 and 4-4 are valid for DLO conditions with SFTO and Tables 4-5 and 4-6 are valid for SLO conditions with SFTO.
The impact of AFTO on MCPR is address ed in Section 10. PR/PLUOOS + TBSOOS values were obtained by taking the most limiting values of the two EOOS conditions (Reference 11). For the PR/PLUOOS + RPTOOS condition, the limits are listed in Section 10; these values are bounding for non-AFTO conditions.
The cycle-specific SLMCPRs, known as MCPR 99.9% can be found in Table 4-7 for dual loop and single loop operating conditions. The values in Table 4-7 or more conservative values were used to calculate the MCPR limits and off -rated limits in this section and Section 10.
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TABLE 4-1 Operating Limit Minimum Critical Power Ratio (Symmetric Feedwater Heating)
All Fuel Types (References 2 and 11)
SCRAM Cycle Exposure EOOS Combination Time 3532 MWd/ST 8000 MWd/ST EOR-5007 Option(1) < 3532 MWd/ST & < 8000 & < EOR-5007 MWd/ST MWd/ST MWd/ST BASE B 1.34 1.34 1.36 1.36 A 1.42 1.42 1.44 1.44 BASE SLO B 1.42 1.42 1.42 1.42 A 1.46 1.46 1.48 1.48 RPTOOS B 1.37 1.37 1.39 1.39 A 1.44 1.44 1.46 1.46 RPTOOS SLO B 1.42 1.42 1.43 1.43 A 1.48 1.48 1.50 1.50 PR/PLUOOS B 1.34 1.34 1.36 1.36 A 1.42 1.42 1.44 1.44 PR/PLUOOS SLO B 1.42 1.42 1.42 1.42 A 1.46 1.46 1.48 1.48 TBSOOS B 1.40 1.38 1.40 1.40 A 1.46 1.46 1.48 1.48 TBSOOS SLO B 1.44 1.42 1.44 1.44 A 1.50 1.50 1.52 1.52 PR/PLUOOS + B 1.40 1.38 1.40 1.40 TBSOOS A N/A N/A N/A N/A
(1) When Tau does not equal 0 or 1, use linear interpolation.
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TABLE 4-2 Power Dependent MCPR(P) Limit Adjustments and Multipliers (Symmetric Feedwater Heating)
All Fuel Types (References 2 and 11)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 22.6 26.3 > 26.3 40 55 65 85 > 85 100 of rated) OLMCPR OLMCPR Multiplier, Kp
Base < 60 2.49 2.49 2.33 1.405 1.285 1.210 1.130 1.056 1.056 1.000
> 60 2.49 2.49 2.40 Base SLO < 60 2.53 2.53 2.37 1.405 1.285 1.210 1.130 1.056 1.056 1.000
> 60 2.53 2.53 2.44 RPTOOS < 60 2.49 2.49 2.33 1.405 1.285 1.210 1.130 1.056 1.056 1.000
> 60 2.49 2.49 2.40 RPTOOS SLO < 60 2.53 2.53 2.37 1.405 1.285 1.210 1.130 1.056 1.056 1.000
> 60 2.53 2.53 2.44 PR/PLUOOS < 60 2.49 2.49 2.33 1.405 1.285 1.210 1.170 1.119 1.066 1.000
> 60 2.49 2.49 2.40 PR/PLUOOS SLO < 60 2.53 2.53 2.37 1.405 1.285 1.210 1.170 1.119 1.066 1.000
> 60 2.53 2.53 2.44 TBSOOS < 60 2.93 2.93 2.66 1.405 1.285 1.210 1.130 1.061 1.061 1.000
> 60 2.93 2.93 2.87 TBSOOS SLO < 60 2.97 2.97 2.70 1.405 1.285 1.210 1.130 1.061 1.061 1.000
> 60 2.97 2.97 2.91 PR/PLUOOS + < 60 2.93 2.93 2.66 1.405 1.285 1.210 1.170 1.119 1.066 1.000 TBSOOS > 60 2.93 2.93 2.87
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TABLE 4-3 Flow Dependent MCPR Limits MCPR(F)
(Symmetric Feedwater Heating)
GNF2 Fuel (Reference 2)
Core Flow MCPR(F)
(% rated) Limit 0.0 1.70 30.0 1.53 79.0 1.25 110.0 1.25
TABLE 4-4 Flow Dependent MCPR Limits MCPR(F)
(Symmetric Feedwater Heating)
GNF3 Fuel (Reference 2)
Core Flow MCPR(F)
(% rated) Limit 0.0 1.76 30.0 1.58 92.2 1.20 110.0 1.20
TABLE 4-5 SLO Flow Dependent MCPR Limits MCPR(F)
(Symmetric Feedwater Heating)
GNF2 Fuel (Reference 2)
Core Flow MCPR(F)
(% rated) Limit 0.0 1.74 30.0 1.57 79.0 1.29 110.0 1.29
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TABLE 4-6 SLO Flow Dependent MCPR Limits MCPR(F)
(Symmetric Feedwater Heating)
GNF3 Fuel (Reference 2)
Core Flow MCPR(F)
(% rated) Limit 0.0 1.80 30.0 1.62 92.2 1.24 110.0 1.24
TABLE 4-7 Cycle Specific SLMCPR (MCPR99.9%)
All Fuel Types (Reference 2)
Loop Operation MCPR99.9%
< 8000 MWd/ST 8000 MWd/ST DLO 1.10 1.11 SLO 1.10 1.11
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5.0 LHGR LIMITS
5.1 Technical Specification Section 3.2.3, 3.3.4.2, 3.4.1 and 3.7.6
5.2 Description
The LHGR values for all fuel types are provided in Tables 5-1 and 5-2. The ARTS-based LHGR power-dependent multipliers (LHGRFAC(P)) are provided in Tables 5-3 and 5-4 for GNF2 and GNF3 fuel, respectively. Tables 5-3 and 5-4 are valid for a maximum temperature reduction of 90o F for FFWTR operation (bounding for FWHOOS operation) (Reference 2). In certain configurations when the unit is operating with two FW pumps and two FW heater strings in service, there is the potential for an asymmetric loss of feedwater heating (ALOFH) event of more than 100°F. Per Reference 8, operation in that configuration requires LHGRFAC(P) restriction provided in Table 5-5 for operation at or below 60% of rated power. The penalty provided in Table 5-5 is GNF3 specific per Reference 8. The corresponding penalty for GNF2 fuel is bounded by the LHGRFAC(P) limit in Table 5-3. Linear interpolation should be used for Tables 5-1 and 5-2 as directed in References 13 and 15.
The LHGR flow-dependent multipliers (LHGRFAC(F)) are provided in Table 5-6 for GNF2 fuel and Table 5-7 for GNF3 fuel as a function of the number of recirculation loops in operation. The SLO LHGR multiplier is provided and accounted for in these tables. The impact of AFTO on LHGR is addressed in Section 10.0. PR/PLUOOS + TBSOOS values were obtained by taking the most limiting values of the two EOOS conditions (Reference 11). For the PR/PLUOOS + RPTOOS condition, the limits are listed in Section 10.0; these values are bounding for non-AFTO conditions. The power and flow dependent LHGR multipliers are sufficient to provide adequate protection for the off-rated conditions from an ECCS-LOCA analysis perspective.
TABLE 5-1 Linear Heat Generation Rate Limits - UO2 Rods (References 10, 13, and 15)
Fuel Type LHGR Limit GNF2 See Table 1 of Reference 13 GNF3 See Table A-1 of Reference 15
TABLE 5-2 Linear Heat Generation Rate Limits - Gad Rods (References 10, 13, and 15)
Fuel Type LHGR Limit GNF2 See Table 2 of Reference 13 GNF3 See Table A-2 of Reference 15
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TABLE 5-3 Power Dependent LHGR Multiplier LHGRFAC(P)
(Symmetric Feedwater Heating)
GNF2 Fuel (References 2 and 11)
Core Core Thermal Power (% of rated)
EOOS Flow (%
Combination of rated) 0 22.6 26.3 >26.3 40 55 65 85 100
Base < 60 0.508 0.508 0.522 0.620 0.696 0.751 0.817 0.930 1.000
> 60 0.508 0.508 0.522 Base SLO < 60 0.508 0.508 0.522 0.620 0.696 0.751 0.817 0.930 1.000
> 60 0.508 0.508 0.522 RPTOOS < 60 0.508 0.508 0.522 0.620 0.696 0.751 0.817 0.930 1.000
> 60 0.508 0.508 0.522 RPTOOS SLO < 60 0.508 0.508 0.522 0.620 0.696 0.751 0.817 0.930 1.000
> 60 0.508 0.508 0.522 PR/PLUOOS < 60 0.508 0.508 0.522 0.620 0.696 0.751 0.817 0.930 1.000
> 60 0.508 0.508 0.522 PR/PLUOOS < 60 0.508 0.508 0.522 0.620 0.696 0.751 0.817 0.930 1.000 SLO > 60 0.508 0.508 0.522 TBSOOS < 60 0.397 0.397 0.442 0.620 0.655 0.714 0.817 0.930 1.000
> 60 0.397 0.397 0.417 TBSOOS SLO < 60 0.397 0.397 0.442 0.620 0.655 0.714 0.817 0.930 1.000
> 60 0.397 0.397 0.417 PR/PLUOOS + < 60 0.397 0.397 0.442 0.620 0.655 0.714 0.817 0.930 1.000 TBSOOS > 60 0.397 0.397 0.417
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TABLE 5-4 Power Dependent LHGR Multiplier LHGRFAC(P)
(Symmetric Feedwater Heating)
GNF3 Fuel (References 2 and 11)
Core Core Thermal Power (% of rated)
EOOS Flow (%
Combination of rated) 0 22.6 26.3 >26.3 40 55 65 85 100
Base < 60 0.440 0.440 0.460 0.640 0.790 0.950 1.000 1.000 1.000
> 60 0.440 0.440 0.460 Base SLO < 60 0.440 0.440 0.460 0.640 0.790 0.950 1.000 1.000 1.000
> 60 0.440 0.440 0.460 RPTOOS < 60 0.440 0.440 0.460 0.640 0.790 0.950 1.000 1.000 1.000
> 60 0.440 0.440 0.460 RPTOOS SLO < 60 0.440 0.440 0.460 0.640 0.790 0.950 1.000 1.000 1.000
> 60 0.440 0.440 0.460 PR/PLUOOS < 60 0.440 0.440 0.460 0.640 0.790 0.950 0.990 1.000 1.000
> 60 0.440 0.440 0.460 PR/PLUOOS < 60 0.440 0.440 0.460 0.640 0.790 0.950 0.990 1.000 1.000 SLO > 60 0.440 0.440 0.460 TBSOOS < 60 0.410 0.410 0.460 0.640 0.790 0.950 1.000 1.000 1.000
> 60 0.410 0.410 0.430 TBSOOS SLO < 60 0.410 0.410 0.460 0.640 0.790 0.950 1.000 1.000 1.000
> 60 0.410 0.410 0.430 PR/PLUOOS + < 60 0.410 0.410 0.460 0.640 0.790 0.950 0.990 1.000 1.000 TBSOOS > 60 0.410 0.410 0.430
TABLE 5-5 Power Dependent LHGR Multiplier LHGRFAC(P)
Asymmetric Loss of Feedwater Heating (Reference 8)
Reactor Power LHGR Restriction
P < 60% of rated 0.902
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TABLE 5-6 Flow Dependent LHGR Multiplier LHGRFAC(F)
(Symmetric Feedwater Heating)
GNF2 Fuel (Reference 2)
Core Flow (% of rated)
EOOS Combination 0 30 33.6 70 80 110 LHGRFAC(F) Multiplier Dual Loop 0.506 0.706 0.730 0.973 1.000 1.000 Single Loop 0.506 0.706 0.730 0.730 0.730 0.730
TABLE 5-7 Flow Dependent LHGR Multiplier LHGRFAC(F)
(Symmetric Feedwater Heating)
GNF3 Fuel (Reference 2)
Core Flow (% of rated)
EOOS Combination 0 30 65.5 80.3 110 LHGRFAC(F) Multiplier Dual Loop 0.457 0.660 0.900 1.000 1.000 Single Loop 0.457 0.660 0.900 0.900 0.900
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6.0 ROD BLOCK MONITOR SETPOINTS
6.1 Technical Specification Section 3.3.2.1
6.2 Description
The RBM power-biased Allowable Values and MCPR Limits for all fuel types are provided in Table 6-1 with supporting documentation in References 2, 3, 8 and 9. Per Reference 8, the more limiting GNF2 penalties for AFTO are applied for both GNF2 and GNF3 fuel. The SFTO MCPR Limits apply when FWT difference is less than 20°F. The AFTO MCPR Limits apply with FWT difference between 20 and 55°F. AFTO conditions are discussed further in Section 10.
TABLE 6-1 Rod Block Monitor Setpoints All Fuel Types (References 2, 3, 8 and 9)
Power Level Allowable Value(1) SFTO MCPR Limit AFTO MCPR Limit
Low Trip Setpoint < 1.76 (2) < 1.81 (4)
(LTSP) 124.0% < 1.45 (3) < 1.49 (5)
Intermediate Trip Setpoint < 1.76 (2) < 1.81 (4)
(ITSP) 119.2% < 1.45 (3) < 1.49 (5)
High Trip Setpoint < 1.76 (2) < 1.81 (4)
(HTSP) 114.2% < 1.45 (3) < 1.49 (5)
< 1.76 (2) < 1.81 (4)
Inoperable (INOP) N/A < 1.45 (3) < 1.49 (5)
(1) These setpoints (with RBM filter time constant between 0.1 seconds and 0.55 seconds) are based on cycle-specific rated RWE MCPR limits which are bounded by the OLMCPRs listed in Table 4-1.
(2) This is the MCPR limit for SFTO (given THERMAL POWER is >28.4% and < 90%) below which the RBM is required to be OPERABLE (see COLR Reference 2 and TS Table 3.3.2.1-1).
(3) This is the MCPR limit for SFTO (given THERMAL POWER is > 90%) below which the RBM is required to be OPERABLE (see COLR Reference 2 and TS Table 3.3.2.1-1).
(4) This is the MCPR limit for AFTO (given THERMAL POWER is 28.4% and < 90%) below which the RBM is required to be OPERABLE (see COLR References 2 and 8 and TS Table 3.3.2.1-1).
(5) This is the MCPR limit for AFTO (given THERMAL POWER is 90%) below which the RBM is required to be OPERABLE (see COLR References 2 and 8 and TS Table 3.3.2.1-1).
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7.0 TURBINE BYPASS VALVE PARAMETERS
7.1 Technical Specification Section 3.7.6
7.2 Description
The operability requirements for the steam bypass system are governed by Technical Specification 3.7.6.
If the requirements cannot be met, the appropriate power and flow dependent limits for Turbine Bypass System Out-of-Service (TBSOOS) must be used. Table 7-1 includes the Turbine Bypass Valve response time parameters. The minimum number of bypass valves to maintain system operability is provided in Table 7-2 per Reference 12.
TABLE 7-1 Turbine Bypass System Response Time (Reference 12)
Maximum delay time before start of bypass valve opening 0.10 sec following initial turbine inlet valve movement(1)
Maximum time after initial turbine inlet valve movement(1) for bypass valve position to reach 80% of full flow (includes the 0.30 sec above delay time)
TABLE 7-2 Minimum Required Bypass Valves to Maintain System Operability (Reference 12)
Reactor Power No. of Valves in Service
P 22.6% 8
(1) First movement of any TSV or any TCV (whichever occurs first)
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8.0 EOC RECIRCULATION PUMP TRIP (EOC-RPT) OPERABILITY
8.1 Technical Specification Section 3.3.4.2
8.2 Description
The operability requirements for the EOC-RPT are governed by Technical Specification 3.3.4.2. If the requirements cannot be met, the appropriate power and flow dependent limits for EOC Recirculation Pump Trip Out of Service (RPTOOS) must be used. Table 8-1 includes the total RPT response time parameter.
TABLE 8-1 Recirculation Pump Trip Response Time (Reference 12)
Total Recirculation Pump Trip Response Time The time from when the turbine valves (turbine control valve or 0.175 sec turbine stop valve) start to close until complete arc suppression of the EOC-RPT circuit breakers as described in Reference 7.
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9.0 STABILITY PROTECTION
9.1 Technical Specification Section 3.3.1.1, Table 3.3.1.1-1 Function 2.f
9.2 Description
Per Reference 2, the Cycle 25 DSS-CD SAD Setpoint was confirmed to be 1.10 for DLO and SLO. The Automated Backup Stability Protection (BSP) Setpoints are provided in Table 9-1. The Manual BSP Endpoints for Normal F WT and Reduced FWT are provided in Tables 9-2 and 9-3, respectively. Table 9-3 is intended for feedwater temperatures 10-90oF below nominal (Reference 2).
TABLE 9-1 Automated BSP Setpoints for the Scram Region (Reference 2)
Parameter Symbol Value
Slope of ABSP APRM flow-biased trip mTrip 1.62 linear segment.
ABSP APRM flow-biased trip setpoint power intercept. P 39.5% RTP Constant Power Line for Trip from zero BSP-Trip Drive Flow to Flow Breakpoint value.
ABSP APRM flow-biased trip setpoint drive flow intercept. Constant Flow Line WBSP-Trip 55.3% RDF for Trip.
Flow Breakpoint value WBSP-Break 29.9% RDF
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TABLE 9-2(1)
Manual BSP Endpoints for Normal Feedwater Temperature (Reference 2)
Endpoint Power (%) Flow (%) Definition
A1 80.8 59.4 Scram Region Boundary, HFCL
B1 39.5 31.0 Scram Region Boundary, NCL
A2 82.0 61.0 Controlled Entry Region Boundary, HFCL
B2 27.6 30.1 Controlled Entry Region Boundary, NCL
Note: The BSP Boundary for Normal and Reduced Feedwater Temperature is defined by the MELLLA boundary line, per Reference 2.
TABLE 9-3(1)
Manual BSP Endpoints for Reduced Feedwater Temperature (Reference 2)
Endpoint Power (%) Flow (%) Definition
A1 65.2 52.3 Scram Region Boundary, HFCL
B1 33.7 30.6 Scram Region Boundary, NCL
A2 68.3 56.4 Controlled Entry Region Boundary, HFCL
B2 27.6 30.1 Controlled Entry Region Boundary, NCL
Note: The BSP Boundary for Normal and Reduced Feedwater Temperature is defined by the MELLLA boundary line, per Reference 2.
(1) Station may elect to place additional administrative margin on the endpoints provided in Table 9-2 and Table 9-3, per Reference 14.
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10.0 ASYMMETRIC FEEDWATER TEMPERATURE OPERATION (AFTO)
AFTO is the result of the specific configuration of the feedwater lines at Peach Bottom. A reduction in heating in either the A or the C heater strings will result in a temperature mismatch between the feedwater flows entering the opposite sides of the reactor vessel. This temperature mismatch may result in errors in the thermal limit values calculated by the core monitoring system. Thermal limit values for all conditions and events are impacted by these errors, excluding SLO conditions.
AFTO is defined as operation in a feedwater heater/string configuration that results in a specified threshold difference as described in Reference 8. To simplify the implementation of the AFTO limits, only the maximum AFTO penalties indicated in Tables 4-3 and 4-4 of Reference 8 will be implemented when the threshold asymmetry temperature is exceeded; this will minimize the number of AFTO thermal limit tables in the COLR and core monitoring system. There is no AFTO penalty for a FWT difference less than or equal to 20oF and thermal limits are unanalyzed for a difference above 55oF. The MCPR penalty for AFTO also applies to RBM Operability MCPR Limits, which are addressed in Section 6.0.
10.1 MAPLHGR LIMITS
An appropriate penalty must be applied to MAPLHGR limits under AFTO for varying temperature differentials per Reference 8. The reduction factor listed in Table 10-1 is the maximum penalty for the full range of analyzed FWT mismatches, bounding all smaller temperature deltas for all fuel types.
TABLE 10-1 AFTO MAPLHGR Reduction Factor (Asymmetric Feedwater Heating)
All Fuel Types (Reference 8)
AFTO Reduction Factor 20F < FWT DELTA 55 F 0.960
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10.2 MCPR LIMITS
The OLMCPRs during AFTO with a FWT difference greater than 20F are provided in Table 10-2. The ARTS-based MCPR(P) limits and multipliers (K p) for use during AFTO conditions are provided in Table 10-3. The MCPR (F) limits for AFTO are provided in Table 10-4 for GNF2 fuel and Table 10-5 for GNF3 fuel. The power-and flow-dependent OLMCPR curves were obtained from Reference 2 and were adjusted with a penalty for feedwater temperature difference greater than 20F as per Reference 8. PR/PLUOOS +
TBSOOS and PR/PLUOOS + RPTOOS values were obtained by taking the most limiting values of the two EOOS conditions (Reference 11).
TABLE 10-2 AFTO Operating Limit Minimum Critical Power Ratio 20F < FWT DELTA 55 F (Asymmetric Feedwater Heating)
All Fuel Types (References 2, 8 and 11)
SCRAM Cycle Exposure EOOS Combination Time 3532 MWd/ST 8000 MWd/ST EOR-5007 Option (1) < 3532 MWd/ST & < 8000 & < EOR-5007 MWd/ST MWd/ST MWd/ST BASE B 1.38 1.38 1.40 1.40 A 1.46 1.46 1.48 1.48 RPTOOS B 1.41 1.41 1.43 1.43 A 1.48 1.48 1.50 1.50 PR/PLUOOS B 1.38 1.38 1.40 1.40 A 1.46 1.46 1.48 1.48 TBSOOS B 1.44 1.42 1.44 1.44 A 1.50 1.50 1.52 1.52 PR/PLUOOS + TBSOOS B 1.44 1.42 1.44 1.44 A N/A N/A N/A N/A PR/PLUOOS + RPTOOS B 1.41 1.41 1.43 1.43 A N/A N/A N/A N/A
(1) When Tau does not equal 0 or 1, use linear interpolation.
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TABLE 10-3 AFTO Power Dependent MCPR Limit Adjustments And Multipliers MCPR(P) 20F < FWT DELTA 55F (Asymmetric Feedwater Heating)
All Fuel Types (References 2, 8 and 11)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 22.6 26.3 > 26.3 40 55 65 85 > 85 100 of rated) OLMCPR OLMCPR Multiplier, Kp
Base < 60 2.56 2.56 2.40 1.405 1.285 1.210 1.130 1.056 1.056 1.000
> 60 2.56 2.56 2.47 RPTOOS < 60 2.56 2.56 2.40 1.405 1.285 1.210 1.130 1.056 1.056 1.000
> 60 2.56 2.56 2.47 PR/PLUOOS < 60 2.56 2.56 2.40 1.405 1.285 1.210 1.170 1.119 1.066 1.000
> 60 2.56 2.56 2.47 TBSOOS < 60 3.02 3.02 2.74 1.405 1.285 1.210 1.130 1.061 1.061 1.000
> 60 3.02 3.02 2.96 PR/PLUOOS + < 60 3.02 3.02 2.74 1.405 1.285 1.210 1.170 1.119 1.066 1.000 TBSOOS > 60 3.02 3.02 2.96 PR/PLUOOS + < 60 2.56 2.56 2.40 1.405 1.285 1.210 1.170 1.119 1.066 1.000 RPTOOS > 60 2.56 2.56 2.47
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TABLE 10-4 AFTO Flow Dependent MCPR Limits MCPR(F) 20F < FWT DELTA 55F (Asymmetric Feedwater Heating)
GNF2 Fuel (References 2 and 8)
Flow MCPR(F)
(% rated) Limit 0.0 1.75 30.0 1.58 79.0 1.29 110.0 1.29
TABLE 10-5 AFTO Flow Dependent MCPR Limits MCPR(F) 20F < FWT DELTA 55 F (Asymmetric Feedwater Heating)
GNF3 Fuel (References 2 and 8)
Flow MCPR(F)
(% rated) Limit 0.0 1.80 30.0 1.61 92.2 1.22 110.0 1.22
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10.3 LHGR LIMITS
The ARTS-based LHGRFAC(P) values for AFTO operation are provided in Table 10-6 for GNF2 fuel and Table 10-7 for GNF3 fuel. The LHGRFAC(F) values for AFTO in DLO are provided in Table 10-8 and 10-9 for GNF2 and GNF3 fuel, respectively. The power-and flow-dependent LHGR multipliers were obtained from Reference 2 and were adjusted with the appropriate penalties as per Reference 8. PR/PLUOOS +
TBSOOS and PR/PLUOOS + RPTOOS values were obtained by taking the most limiting values of the two EOOS conditions (Reference 11).
TABLE 10-6 AFTO Power Dependent LHGR Multiplier LHGRFAC(P) 20 F < FWT DELTA 55 F (Asymmetric Feedwater Heating)
GNF2 Fuel (References 2, 8 and 11)
Core Core Thermal Power (% of rated)
EOOS Combination Flow
(% of 0 22.6 26.3 >26.3 40 55 65 85 100 rated)
Base < 60 0.488 0.488 0.501 0.595 0.668 0.721 0.784 0.893 0.960
> 60 0.488 0.488 0.501 RPTOOS < 60 0.488 0.488 0.501 0.595 0.668 0.721 0.784 0.893 0.960
> 60 0.488 0.488 0.501 PR/PLUOOS < 60 0.488 0.488 0.501 0.595 0.668 0.721 0.784 0.893 0.960
> 60 0.488 0.488 0.501 TBSOOS < 60 0.381 0.381 0.424 0.595 0.629 0.685 0.784 0.893 0.960
> 60 0.381 0.381 0.400 PR/PLUOOS + TBSOOS < 60 0.381 0.381 0.424 0.595 0.629 0.685 0.784 0.893 0.960
> 60 0.381 0.381 0.400 PR/PLUOOS + RPTOOS < 60 0.488 0.488 0.501 0.595 0.668 0.721 0.784 0.893 0.960
> 60 0.488 0.488 0.501
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TABLE 10-7 AFTO Power Dependent LHGR Multiplier LHGRFAC(P) 20F < FWT DELTA 55F (Asymmetric Feedwater Heating)
GNF3 Fuel (References 2, 8 and 11)
Core Core Thermal Power (% of rated)
EOOS Combination Flow
(% of 0 22.6 26.3 >26.3 40 55 65 85 100 rated)
Base < 60 0.422 0.422 0.442 0.614 0.758 0.912 0.960 0.960 0.960
> 60 0.422 0.422 0.442 RPTOOS < 60 0.422 0.422 0.442 0.614 0.758 0.912 0.960 0.960 0.960
> 60 0.422 0.422 0.442 PR/PLUOOS < 60 0.422 0.422 0.442 0.614 0.758 0.912 0.950 0.960 0.960
> 60 0.422 0.422 0.442 TBSOOS < 60 0.394 0.394 0.442 0.614 0.758 0.912 0.960 0.960 0.960
> 60 0.394 0.394 0.413 PR/PLUOOS + TBSOOS < 60 0.394 0.394 0.442 0.614 0.758 0.912 0.950 0.960 0.960
> 60 0.394 0.394 0.413 PR/PLUOOS + RPTOOS < 60 0.422 0.422 0.442 0.614 0.758 0.912 0.950 0.960 0.960
> 60 0.422 0.422 0.442
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TABLE 10-8 AFTO Flow Dependent LHGR Multiplier LHGRFAC(F) 20F < FWT DELTA 55F (Asymmetric Feedwater Heating)
GNF2 Fuel (References 2 and 8)
Core Flow (% of rated)
EOOS Combination 0 30 33.6 70 80 110 LHGRFAC(F) Multiplier Dual Loop 0.486 0.678 0.701 0.934 0.960 0.960
TABLE 10-9 AFTO Flow Dependent LHGR Multiplier LHGRFAC(F) 20 F < FWT DELTA 55 F (Asymmetric Feedwater Heating)
GNF3 Fuel (References 2 and 8)
Core Flow (% of rated)
EOOS Combination 0 30 65.5 80.3 110 LHGRFAC(F) Multiplier Dual Loop 0.439 0.634 0.864 0.960 0.960
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11.0 MODES OF OPERATION
The following conditions are supported by the Peach Bottom 2 Cycle 25 licensing analysis; operation in a condition (or conditions) is controlled by station procedures. If a combination of options is not listed, it is not supported. Table 11-1 provides allowed modes of operation with thermal limit sets in the COLR. Table 11-2 provides all EOOS included in the Base condition. Table 11-3 provides power level restrictions that support specific operating conditions.
TABLE 11-1 Modes of Operation (Reference 2)
Supported Scram Supported Recirculation Supported EOOS Options Speed Option Loop Operation SFTO/AFTO Base(1,2) A or B DLO or SLO(3) SFTO or AFTO TBSOOS A or B DLO or SLO(3) SFTO or AFTO RPTOOS A or B DLO or SLO(3) SFTO or AFTO PR/PLUOOS A or B DLO or SLO(3) SFTO or AFTO PR/PLUOOS + TBSOOS(6) B DLO SFTO or AFTO PR/PLUOOS + RPTOOS B DLO AFTO(4)
TABLE 11-2 EOOS Options Included in 'Base' Condition (Reference 2)
Condition 1 TBVOOS 2 SRVOOS 1 MSIVOOS(5) 1 TCV/TSVOOS(5)
TABLE 11-3 Power Level Restrictions (Reference 2)
Condition Power Level Restriction (% rated) 1 TCVOOS and/or 1 TSVOOS 90 1 TCVOOS and/or 1 TSVOOS + TBSOOS 85 1 MSIVOOS 75
(1) The 'Base' condition includes the options listed in Table 11-2.
(2) The 'Base' condition includes operation with FWHOOS/FFWTR. Operation not permitted in the MELLLA+
Region for reduced FWT conditions as controlled by station procedures.
(3) Operation in SLO not permitted in the MELLLA+ Region as controlled by station procedures.
(4) AFTO limits bound SFTO limits.
(5) Permitted at power levels provided in Table 11-3 and in the applicable station procedure.
(6) TCVSC event is bounded by the PR/PLUOOS + TBSOOS condition per Reference 4.
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12.0 METHODOLOGY
The analytical methods used in determining the core operating limits have been previously reviewed and approved by the NRC, specifically those described in the following document:
- 1. General Electric Standard Application for Reactor Fuel, Global Nuclear Fuel (GNF) Document No. NEDE-24011-P-A-31, November 2020 and U.S. Supplement NED E-24011-P-A-31-US, November 2020.
13.0 REFERENCES
- 1. "Subsequent Renewed Facility Operating License", Constellation Document, Docket No. 50 -277, Subsequent Renewed License No. DPR -44.
- 2. "Supplemental Reload Licensing Report for Peach Bottom Unit 2 Reload 24 Cycle 25, GNF Document No.
006N2027, Revision 1, October 2022.
- 3. GNF3 Fuel Design Cycle -Independent Analyses for Peach Bottom Atomic Power Station Units 2 and 3, GNF Document No. 006N4378, Revision 1, October 2022.
- 4. Thermal Limits Evaluation for the TCV Slow Closure Event for Peach Bottom, Exelon Technical Evaluation EC 632705, Revision 1, November 2021.
- 5. Clarify Rated Feedwater Temp for Feedwater Temp Reduction Curves, Exelon Technical Evaluation EC 628049, Revision 0, August 2019.
- 6. Safety Analysis Report for Peach Bottom Atomic Power Station, Units 2 and 3, Thermal Power Optimization, GE Hitachi Document NEDO-33873, Revision 0, February 2017.
- 7. Determination of Time Required to Initiate Trip Signal to the RPT CKT, Exelon Calculation No. PE -0173, Revision 1A, January 2019.
- 8. Evaluation of Peach Bottom Atomic Power Station Units 2 and 3 Asymmetric Feedwater Temperature Operation with GNF3 Fuel, GNF Document No. 006N0624, Revision 0, December 2020.
- 9. Provide Allowable Values (AV) and Nominal Trip Setpoints (NTSP) for Various Setpoint Functions of the NUMAC PRNM System, Exelon Calculation PE-0251, Revision 4, July 2017.
- 10. "Fuel Bundle Information Report for Peach Bottom Unit 2 Reload 24 Cycle 25", GNF Document No. 006N2028, Revision 0, August 2022.
- 11. Peach Bottom Atomic Power Station Units 2 and 3 GNF3 PROOS and/or PLUOOS and EOOS Combination Limits Report, GNF Document No. 006N7704, Revision 1, September 2021.
- 13. PRIME-Based GNF2 LHGR Envelopes for Peach Bottom Atomic Power Station Units 2 and 3, GNF Document 004N7833-P, Revision 0, April 2018.
- 14. GE Hitachi Boiling Water Reactor Detect and Suppress Solution - Confirmation Density, GE Hitachi Document NEDC-33075P-A, Revision 8, November 2013.
- 15. GNF3 Generic Compliance with NEDE-24011-P-A (GESTAR II), GNF Document NEDC-33879P, Revision 4, August 2020.
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APPENDIX A Power/Flow Operating Map for MELLLA+ with TPO (Reference 6)
BSP Boundary