ML092790470
| ML092790470 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 10/01/2009 |
| From: | Heverly M, Psaros A Exelon Nuclear |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| Download: ML092790470 (23) | |
Text
Enclosure 6 Core Operating Limits Report for Peach Bottom Atomic Power Station (PBAPS) Unit 3 Reload 15, Cycle 16, Revision 2 Non-Proprietary Version
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 1 of 22 Rev. 2 CORE OPERATING LIMITS REPORT FOR PEACH BOTTOM ATOMIC POWER STATION UNIT 3 RELOAD 15, CYCLE 16 REVISION 2 (This COLR revision is a re-write)
Prepared By: Date:
A. R. Psaros / M. M. Heverly Reviewed By: Date:
G. Rubinaccio Approved By: Date:
J. J. Tusar
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 2 of 22 Rev. 2 Table of Contents Page 1.0 Terms and Definitions 4 2.0 General Information 5 3.0 MAPLHGR Limits 7 4.0 MCPR Limits 8 5.0 Linear Heat Generation Rate Limits 11 6.0 Rod Block Monitor Setpoints 13 7.0 Turbine Bypass Valve Parameters 14 8.0 EOC Recirculation Pump Trip (EOC-RPT) Operability 14 9.0 Concurrent TBVOOS And RPTOOS 15 10.0 Stability Protection Oscillation Power Range Monitor (OPRM) 15 11.0 Asymmetric Feedwater Temperature Operation (AFTO) 16 12.0 Modes of Operation 21 13.0 Methodology 21 14.0 References 21
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 3 of 22 Rev. 2 List of Tables Table 3-1 MAPLHGR Versus Average Planar Exposure-GE 14 7 Table 3-2 MAPLHGR Versus Average Planar Exposure-GNF2 7 Table 3-3 MAPLHGR Single Loop Operation (SLO) Reduction Factor 7 Table 4-1 Operating Limit Minimum Critical Power Ratio-GE14 9 Table 4-2 Operating Limit Minimum Critical Power Ratio-GNF2 9 Table 4-3 Power Dependent MCPR(P) Limit Adjustments and Multipliers 10 Table 4-4 Flow Dependent MCPR Limits MCPR(F) 10 Table 5-1 Linear Heat Generation Rate Limits At BOC 11 Table 5-2 LHGR Single Loop Operation (SLO) Reduction Factor 11 Table 5-3 Power Dependent LHGR Multiplier LHGRFAC(P) 12 Table 5-4 Power Dependent LHGR Multiplier LHGRFAC(P) - TBVOOS / RPTOOS 12 Table 5-5 Flow Dependent LHGR Multiplier LHGRFAC(F) 12 Table 6-1 Rod Block Monitor Setpoints 13 Table 7-1 Turbine Bypass System Response Time 14 Table 7-2 Minimum Required Bypass Valves To Maintain System Operability 14 Table 10-1 OPRM PBDA Trip Settings 15 Table 10-2 OPRM PBDA Trip Settings - SLO 15 Table 11-1 AFTO Power Dependent LHGR Multiplier LHGRFAC(P) 16 Table 11-2 AFTO Power Dependent LHGR Multiplier LHGRFAC(P) - TBVOOS / RPTOOS 17 Table 11-3 AFTO Flow Dependent LHGR Multiplier LHGRFAC(F) 17 Table 11-4 AFTO Operating Limit Minimum Critical Power Ratio-GE14 18 Table 11-5 AFTO Operating Limit Minimum Critical Power Ratio-GNF2 18 Table 11-6 AFTO Power Dependent MCPR Limit Adjustments and Multipliers 19 Table 11-7 AFTO Flow Dependent MCPR Limits MCPR(F) (BOC to EOC) 19 Table 11-8 AFTO MAPLHGR Reduction Factor 20 Table 11-9 AFTO MAPLHGR Single Loop Operation (SLO) Reduction Factor 20
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 4 of 22 Rev. 2 1.0 Terms and Definitions AFTO Asymmetric Feedwater Temperature Operation ARTS APRM and RBM Technical Specification Analysis BASE Defines two (2) loop operation with at least seven turbine bypass valves in service and the reactor recirculation pump trip system in service.
BOC Beginning Of Cycle DTSP Rod Block Monitor Downscale Trip Setpoint 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% (3514 MWth) with recirculation system flow equal to 100%, all control rods fully withdrawn, all feedwater heating in service and equilibrium Xenon.
FFWTR?I Final Feedwater Temperature Reduction FWHO(OS Feedwater Heaters Out of Service HTSP Rod Block Monitor High Trip Setpoint ICF Increased Core Flow ITSP Rod Block Monitor Intermediate Trip Setpoint LHGR Linear Heat Generation Rate LHGRFFAC(F) ARTS LHGR thermal limit flow dependent adjustments and multipliers LHGRFFAC(P) ARTS LHGR thermal limit power dependent adjustments and multipliers LTSP Rod Block Monitor Low Trip Setpoint MAPL-HGR Maximum Average Planar Linear Heat Generation Rate MCPR Minimum Critical Power Ratio MCPR((P) ARTS MCPR thermal limit power dependent adjustments and multipliers MCPR( F) ARTS MCPR thermal limit flow dependent adjustments and multipliers MELLILA Maximum Extended Load Line Limit Analysis OLMC PR Operating Limit Minimum Critical Power Ratio OPRM PBDA Oscillation Power Range Monitor Period Based Detection Algorithm
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 5 of 22 Rev. 2 RCF Rated Core F1OW RPTOOS Recirculation Pump Trip Out of Service SLMCPR Safety Limit A4inimum Critical Power Ratio SLO Single Loop C)peration TBVOOS Turbine Bypa,ss Valves Out of Service 2.0 General Information This report provides the following cycle-specific parameter limits for Peach Bottom Atomic Power Station Unit 3 Cycle 16 (Reload 15):
- Maximum Average Planar Linear Heat Generation Rate (MAPLHGR)
- Operating Limit Minimum Critical Power Ratio (OLMCPR)
- Linear Heat Generation Rate (LHGR)
- Turbine Bypass Valve Parameters
- Dual Loop Stability Protection - Oscillation Power Range Monitor (OPRM) Trip Setpoints
- Single Loop Stability Protection - Oscillation Power Range Monitor (OPRM) Trip Setpoints
- Asymmetric Feedwater Temperature Operation (AFTO) thermal limit penalties These values have been determined using NRC-approved methodology and are established such that all applicable limits of the plant safety analysis are met.
This report provides cycle-specific Operating Limit MCPR, LHGR, MAPLHGR thermal limits, and related information for the following conditions:
- All points in the operating region of the power/flow map including Maximum Extended Load Line Limit (MELLL) down to 82.9% of rated core flow during full power (3514 MWt) operation
- Increased Core Flow (ICF), up to 110% of rated core flow
- End-of-Cycle Power Coastdown to a minimum power level of 40%
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 6 of 22 Rev. 2
- Feedwater Heaters Out of Service (FWHOOS) to 550 F temperature reduction
- Final Feedwater Temperature Reduction (FFWTR) between End-of-Rated (EOR) and End-of-Cycle (EOC) to 900 F temperature reduction
- Asymmetric Feedwater Temperature Operation (AFTO)
ARTS provides for power- and flow-dependent thermal limit adjustments and multipliers that allow for a more reliable administration of the MCPR and LHGR thermal limits. At any given power/flow (P/F) state, all four limits are to be determined: LHGRFAC(P), LHGRFAC(F), OLMCPR(P), and OLMCPR(F) from sections 4.0, 5.0 and 11.0. The most limiting MCPR and the most limiting LHGR [maximum of OLMCPR(P) and OLMCPR(F) and minimum of LHGRFAC(P) and LHGRFAC(F)] for a given (P,F) condition will be the governing limits. The OLMCPR for each fuel type is determined by the cycle-specific fuel reload analyses in Reference (2). Rated LHGR values are obtained from the bundle-specific thermal-mechanical analysis.
Supporting documentation for the ARTS-based limits is provided in References (2, 8, 9, 11, 18 and 20).
The Allowable Values, documented in Reference (8), for feedwater temperature as a function of thermal power for both FWHOOS and FFWTR are specified in the appropriate Peach Bottom procedures.
Also note that the following description of MAPLHGR, LHGR and MCPR limits pertain to NON - AFTO conditions. A separate description of AFTO limits and their associated ARTS tables are located in Section 11.
Preparation of this report was performed in accordance with Exelon Nuclear procedures. This report is submitted in accordance with Technical Specification 5.6.5 of Reference (1) and contains all thermal limit parameters related to the implementation of the ARTS Improvement Program and Maximum Extended Load Line Limit Analyses (ARTS/MELLLA) for Peach Bottom Unit 3 Cycle 16.
The "BASE" thermal limit values shown in tables are for normal two loop operation with at least seven turbine bypass valves in service and the reactor recirculation pump trip system in service.
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 7 of 22 Rev. 2 3.0 MAPLHGR LIMITS The MAPLHGR limits (kW/ft) obtained from the emergency core cooling system (ECCS) analysis are provided in Tables 3-1, 3-2, and 3-3. The MAPLHGR limits comprise a given fuel type as a function of average planar exposure. The MAPLHGR tables are used when hand calculations are required. All MAPLHGR values for each fuel type as a function of axial location and average planar exposure shall be less than or equal to the applicable MAPLHGR limits for the respective fuel and lattice types to be in compliance with Technical Specification 3.2.1. These MAPLHGR limits are specified in References (2) and (16) and the process computer databank. The SLO MAPLHGR multiplier (0.73) is applied as shown in Table 3-3 per Reference 2. This value is based on the limiting GEl4 and GNF2 fuel product line. The SLO MAPLHGR multiplier is clamped at 0.73 for any core flow to ensure peak clad temperatures are maintained within the limits of the cycle-specific LOCA analysis for single recirculation loop operation. AFTO parameters are addressed in Section 11.0.
TABLE 3-1 MAPLHGR Versus Average Planar Exposure-GE14 (Reference 2 and 16)
Average Planar Exposure MAPLHGR Limit (GWD/ST) (kW/ft) 0.0 12.82 14.51 12.82 19.13 12.82 57.61 8.00 63.50 5.00 TABLE 3-2 MAPLHGR Versus Average Planar Exposure-GNF2 (Reference 2 and 16)
Average Planar Exposure MAPLHGR Limit (GWD/ST) (kW/ft) 0.0 13.71 13.24 13.71 18.00 13.71 60.78 7.50 63.50 6.69 TABLE 3-3 MAPLHGR Single Loop Operation (SLO) Reduction Factor (Reference 2)
SLO Reduction Factor 0.73
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 8 of 22 Rev. 2 4.0 MCPR LIMITS The Operating Limit MCPR (OLMCPR) for use in Technical Specifications 3.2.2, 3.4.1, and 3.7.6 for each fuel type is provided in Table 4-1 and Table 4-2. These values are determined by the cycle-specific fuel reload analyses in Reference (2). For Single Loop Operation with Turbine Bypass Valve and Recirculation Pump Trip in-service (Option B) from BOC to EOR-3000, the OLMCPR is increased to 1.38 to comply with the results of the Single Loop Operation Recirculation Pump Seizure Analysis described in Reference (2 and 15). This OLMCPR increase is necessary to prevent violating the Reference (15) SLO SLMCPR considering the appropriate ARTS multiplier for single pump flows. For all other operating domains, the OLMCPR is increased by 0.02 when operating in SLO (due to the 0.02 safety limit MCPR increase for SLO). The Safety Limit MCPRs are documented in Section 2.1.1.2 of Reference (1).
Control rod scram time verification is required as 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).
Separate OLMCPR values are presented herein (Tables 4-1 and 4-2) for the following domains:
"TBVs In-Service (seven or more in-service) and RPT In-Service, maximum FWTR of 90 'F "TBVs Out-of-Service (three or more out-of-service) and RPT In-Service, maximum FWTR of 90 'F "TBVs In-Service (seven or more in-service) and RPT Out-of-Service, maximum FWTR of 90 'F The OLMCPR values are documented in Reference (2) for the GE14 and GNF2 fuel designs. The ARTS-based power-dependent MCPR limits, OLMCPR(P), for use in Technical Specification 3.2.2 are provided in Table 4-
- 3. Table 4-3 is valid for a maximum temperature reduction of 90 'F for FWTR operation. The flow-dependent MCPR limits, OLMCPR(F), are provided in Table 4-4. Table 4-4 is valid for all operating conditions with symmetric feedwater temperature operation. OLMCPR(P, F) curves were obtained from References (4, 9, 11, 18 and 20). AFTO parameters are addressed in Section 11.0.
The Oscillation Power Range Monitor Period Based Detection Algorithm (OPRMPBDA) Trip Settings are based, in part, on the cycle specific OLMCPR and the ARTS-based power dependent MCPR limits [K(p) multiplier] (see OPRM discussion in Section 10.0).
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 9 of 22 Rev. 2 TABLE 4-1 Operating Limit Minimum Critical Power Ratio-GE14 (Reference 2, 4, 9 and 11)
SCRAM Cycle Exposure Time <EOR-3000 > EOR- 3000 EOOS Combination Option*1 ) MWd/ST MWd/ST B 1.32 1.38 BASE A 1.35 1.41 B 1.38(31 1.40 BASE SLO(2) A 1.38(3) 1.43 B 1.37 1.46 TBVOOS A 1.40 1.49 B 1.39 1.48 TBVOOS SLO(2) A 1.42 1.51 B 1.38 1.46 RPTOOS A 1.49 1.63 B 1.40 1.48 RPTOOS SLO(2 ) A 1.51 1.65 TABLE 4-2 Operating Limit Minimum Critical Power Ratio-GNF2 (Reference 2, 4, 9, and 11)
SCRAM Cycle Exposure Time < EOR- 3000 > EOR- 3000 EOOS Combination Option~') MWd/ST MWd/ST B 1.32 1.39 BASE A 1.35 1.42 B 1.38(3) 1.41 BASE SLO(2) A 1.38 3) 1.44 B 1.38 1.46 TBVOOS A 1.41 1.49 B 1.40 1.48 TBVOOS SLO(2) A 1.43 1.51 B 1.39 1.47 RPTOOS A 1.50 1.64 B 1.41 1.49 RPTOOS SLO 2 )_ A 1.52 1.66
- 1) When Tau does not equaL 0 or 1, use linear interpolation.
- 2) For single-loop operation, the MCPR operating limit is 0.02 greater than the two loop value except when the Two Loop Operation MCPR operating limit is less than 1.36 (consistent with Reference 15).
- 3) OLMCPR limit set by the Single Loop Operation (SLO) - Recirculation Pump Seizure Analysis. (Reference 15)
Exelon Nuclear - Nuclear Fuels Non-Proprietary Information Submitted in P316 Core Operating Limits Report Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 10 of 22 Rev. 2 TABLE 4-3 Power Dependent MCPR(P) Limit Adjustments And Multipliers (Symmetric Feedwater Heating)
(Reference 2, 4, 9, 11 and 20)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 25 1i<30 >30 40 55 65 100 of rated) Operating Limit MCPR Operating Limit MCPR Multiplier, Kp
< 60 2.45 2.45 2.36 Base < 1.340 1.286 1.256 1.131 1.000
> 60 2.70 2.70 2.50
< 60 2.47 2.47 2.38 Base SLO 1.340 1.286 1.256 1.131 1.000
> 60 2.72 2.72 2.52
<60 3.19 3.19 2.70 RPTOOS 1.570 1.440 1.335 1.131 1.000
> 60 3.68 3.68 3.19
< 60 3.21 3.21 2.72 RPTOOS SLO 1.570 1.440 1.335 1.131 1.000
> 60 3.70 3.70 3.21
< 60 3.19 3.19 2.70 TBVOOS 1.570 1.440 1.335 1.131 1.000
> 60 3.68 3.68 3.19
< 60 3.21 3.21 2.72 TBVOOS SLO 1.570 1.440 1.335 1.131 1.000
>60 3.70 3.70 3.21 TABLE 4-4 Flow Dependent MCPR Limits MCPR(F)
(Symmetric Feedwater Heating)
(Reference 2, 4, 9, 11, and 18)
Core Flow MCPR(F)
(% rated) Limit 0.0 1.707 79.06 1.250 110.0 1.250
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 11 of 22 Rev. 2 5.0 LINEAR HEAT GENERATION RATE LIMITS The beginning of life (maximum) LHGR values for each fuel type for use in Technical Specification 3.2.3 are provided in Table 5-1. The LHGR values as a function of peak pellet exposure are provided in Reference (16). The bases for the LHGR values are documented in Reference (16). The ARTS-based LHGR power-dependent multipliers (LHGRFAC(P)) are provided in Tables 5-3 and 5-4. Tables 5-3 and 5-4 are valid for a maximum temperature reduction of 900 F for FWTR operation. The flow-dependent multipliers (LHGRFAC(F)) are provided in Table 5-5 as a function of the number of recirculation loops in operation.
The SLO LHGR multiplier (0.73) identified in Reference (2) is shown in Table 5-2. The SLO LHGR multiplier (0.73) is applied through LHGRFAC(F) as shown in Table 5-5. The power-and flow-dependent LHGR multipliers were obtained from References (4, 8, 9, 11 and 20). AFTO parameters are addressed in Section 11.0.
TABLE 5-1 Linear Heat Generation Rate Limits At BOC (Reference 16) if LHGR Limit Fuel Type (kW/ft)
GEl4 13.40 GNF2 (( ))
TABLE 5-2 LHGR Single Loop Operation (SLO) Reduction Factor (Reference 2)
SLO Reduction Factor 0.73
((GNF Proprietary Information removed between double brackets))
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 12 of 22 Rev. 2 TABLE 5-3 Power Dependent LHGR Multiplier LHGRFAC(P)
(Symmetric Feedwater Heating)
(References 4, 8, 9, 11 and 20)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 25 <30 >30 40 55 65 85 - 100 of rated) LHGRFAC(P) Multiplier
< 60 0.5 84 0.5 84 0.600T Base < 0.750 0.798 0.798 0.900 1.000
> 60 0.532 0.532 0.568
_< 60 0.584 0.584 0.600 Base SLO 0.750 0.798 0.798 0.900 1.000
> 60 0.532 0.532 0.568 TABLE 5-4 Power Dependent LHGR Multiplier LHGRFAC(P) - TBVOOS / RPTOOS (Symmetric Feedwater Heating)
(References 4, 8, 9, 11 and 20)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 25 <30 1 >30 40 55 85 95 - 100 of rated) LHGRFAC(P) Multiplier
< 60 0.507 0.507 0.572 RPTOOS 0.698 0.706 0.744 0.930 1.000
> 60 0.421 0.421 0.460
> 60 0.507 0.507 0.572 RPTOOS SLO 0.698 0.706 0.744 0.930 1.000
> 60 0.421 0.421 0.460
< 60 0.507 0.507 0.572 TBVOOS 0.698 0.706 0.744 0.930 1.000
> 60 0.42 1 0.421 0.460
< 60 0.507 0.507 0.5 72 TBVOOS SLO 0.698 0.706 0.744 0.930 1.000
> 60 0.42 1 0.42 1 0.460 TABLE 5-5 Flow Dependent LHGR Multiplier LHGRFAC(F)
(Symmetric Feedwater Heating)
(References 4, 8, 9 and 11)
Core Flow (% of rated)
EOOS Combination 0 25 33.6 70 80 110 LHGRFAC(F) Multiplier Dual Loop 0.506 0.673 0.730 0.973 1.000 1.000 Single Loop 0.506 0.673 0.730 0.730 0.730 0.730
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 13 of 22 Rev. 2 6.0 ROD BLOCK MONITOR SETPOINTS The RBM power-biased Analytical Limits, Allowable Values and MCPR Limits for use in Technical Specification 3.3.2.1 are provided in Table 6-1 per Reference (4) with supporting documentation in References (2) and (12).
TABLE 6-1 Rod Block Monitor Setpoints (References 2, 4, 7 and 12)
Power Level Analytical Limit() Allowable Value(t) MCPR Limit 123.0% 121.2% < 1.70 (2)
LTSP 3)
< 1.40 118.0% 116.2% < 1.70 (2)
ITSP
< 1.40 (3) 113.2% 111.4% < 1.70 (2)
HTSP
< 1.40 (3)
N/A N/A < 1.70 (2)
INOP
< 1.40 (31 (1) These setpoints (with RBM filter time constant between 0.1 seconds and 0.55 seconds) are based on a cycle-specific rated RWE MCPR limit which is less than or equal to the minimum cycle OLMCPR (see COLR references 2, 4 and 12).
(2) This is the MCPR limit (given THERMAL POWER is >28.4% and < 90%) below which the RBM is required to be OPERABLE (see COLR references 2 and 4 and TS Table 3.3.2.1-1).
(3) This is the MCPR limit (given THERMAL POWER is > 90%) below which the RBM is required to be OPERABLE (see COLR references 2 and 4 and TS Table 3.3.2.1-1).
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 14 of 22 Rev. 2 7.0 TURBINE BYPASS VALVE PARAMETERS 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 dependent limits for Turbine Bypass Valves Out-of-Service (TBVOOS) must be used. The minimum number of bypass valves to maintain system operability is provided in Table 7-2 per References (2), (5) and (6). Table 7-1 also includes other Turbine Bypass Valve response time parameters.
TABLE 7-1 Turbine Bypass System Response Time (Reference 2, 5, 6 and 22)
Maximum delay time before start of bypass valve opening following generation of the turbine bypass valve flow signal 0.10 sec Maximum time after generation of a turbine bypass valve flow signal for bypass valve position to reach 80% of full flow 0.30 sec (includes the above delay time)
TABLE 7-2 Minimum Required Bypass Valves To Maintain System Operability (References 2, 5, 6 and 22)
Reactor Power No. of Valves in Service P > 25% 7 8.0 EOC RECIRCULATION PUMP TRIP (EOC-RPT) OPERABILITY If the EOC-RPT is inoperable, then the OLMCPR, LHGRFAC(P), and OLMCPR(P) values for EOC Recirculation Pump Trip Out-of-Service (RPTOOS), must be used. Section 11.0 contains LHGRFAC(P) and OLMCPR(P) for RPTOOS and AFTO.
A total RPT response time of 0.175 seconds is assumed in the safety analysis for both trips and is defined as the time from the turbine valves (TCV or TSV) start to close until complete arc suppression of the EOC-RPT circuit breakers. Reference (10) provides the basis for the RPT response time.
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 15 of 22 Rev. 2 9.0 CONCURRENT TBVOOS AND RPTOOS Cycle 16 is not licensed for TBVOOS and RPTOOS to occur concurrently. Therefore, concurrent TBVOOS and RPTOOS is an unanalyzed condition.
10.0 STABILITY PROTECTION OSCILLATION POWER RANGE MONITOR (OPRM)
The Cycle 16 OPRM Period Based Detection Algorithm (PBDA) Trip Settings are provided in Table 10-1 and 10-2. These values are based on the cycle specific analysis documented in Reference (2). The PBDA is the only OPRM setting credited in the safety analysis as documented in the licensing basis for the OPRM system Reference (19). The OPRM Growth Rate Algorithm (GRA) and Amplitude Based Algorithm (ABA) trip settings for dual loop and single loop can be found in the Power Range Neutron Monitoring Configuration Control Documents (SPID's) G-080-VC-174 through 177 (Unit-3).
Any change to the OLMCPR value and/or ARTS-based power dependent MCPR limits should be evaluated for potential impact on the OPRM PBDA Trip Settings.
TABLE 10-1 OPRM PBDA Trip Settings (Valid for All Conditions)
(Reference 2)
Corresponding Maximum PBDA Trip Amplitude Confirmation Count Trip Setting 1.15 16 TABLE 10-2 OPRM PBDA Trip Settings - SLO"1 '
(Valid For SLO Conditions Only)
(Reference 2 and 21)
Corresponding Maximum PBDA Trip Amplitude Confirmation Count Trip Setting 1.18 18 (1) The standard two loop operation OPRM Trip Settings specified in Table 10-1 must be implemented prior to restarting the idle pump when exiting the SLO condition.
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 16 of 22 Rev. 2 11.0 ASYMMETRIC FEEDWATER TEMPERATURE OPERATION (AFTO)
Asymmetric feedwater heating (resulting from removing a heater string, or individual feedwater heaters, from operation) 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. Asymmetric feedwater temperature operation (AFTO) is defined as operation in a feedwater heater/string configuration which results in a specified threshold difference per Reference (14). This threshold is a function of power and flow. The curve of the threshold values is incorporated in the station procedures that govern AFTO.
As a result of analyses documented in Reference (13), a 4% penalty has been applied to the MCPR limits, Tables 11-4, 11-5, and 11-6. The OLMCPR multipliers are left unchanged. A 7% penalty has been applied to the LHGR ARTS curves and MAPLHGR to ensure that sufficient thermal margin exists during anticipated operational occurrences while in AFTO.
LHGR LIMITS The ARTS-based LHGR power-dependent multipliers (LHGRFAC(P)) for AFTO operation are provided in Tables 11-1 and 11-2 with a 7% penalty applied. Table 11-1 is valid for seven or more (of nine) Turbine Bypass Valves (TBVs) In-Service and Recirculation Pump Trip (RPT) In-Service, maximum 900 F FWTR, with a maximum temperature differential of 550 F between the two feedwater sparger lines. Table 11-2 is valid for three or more (of nine) TBVs Out-of-Service (OOS) or RPTOOS, maximum 90' F FFWTR, with a maximum temperature differential of 550 F between the two feedwater sparger lines. The flow-dependent multipliers (LHGRFAC(F)) for AFTO are provided in Tables 11-3 as a function of the number of recirculation loops in operation only. The SLO LHGR multiplier (0.73) is applied, with a 7% penalty, through LHGRFAC(F) as shown in Table 11-3. LHGRFAC(F) is clamped at 0.679 starting at 33.6% of rated core flow to ensure peak clad temperatures are maintained within the limits of the cycle-specific LOCA analysis for single recirculation loop and asymmetric feedwater temperature operation. The power-and flow-dependent LHGR multipliers were obtained from References (2, 4, 8, 9 and 20) and were adjusted with a 7% penalty as per Reference (13).
TABLE 11-1 AFTO Power Dependent LHGR Multiplier LHGRFAC(P)
(Asymmetric Feedwater Heating)
(References 2, 4, 8, 9, 13 and 20)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 25 <30 >30 40 55 65 85 - 100 of rated) LHGRFAC(P) Multiplier 1< 60 0.543 0.543 0.55 8 Base 0.698 0.742 0.742 0.837 0.930
> 60 0.495 0.495 0.528
_<60 0.543 0.543 0.558 Base SLO 0.698 0.742 0.742 0.837 0.930
> 60 0.495 0.495 0.528
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 17 of 22 Rev. 2 TABLE 11-2 AFTO Power Dependent LHGR Multiplier LHGRFAC(P) - TBVOOS / RPTOOS (Asymmetric Feedwater Heating)
(References 2, 4, 8, 9, 13 and 20)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 25 <30 >30 40 55 85 95 - 100 of rated) LHGRFAC(P) Multiplier RPTOOS : 60 0.472 0.472 0.532 0.649 0.657 0.692 0.865 0.930
> 60 0.392 0.392 0.428
< 60 0.472 0.472 0.532 RPTOOS SLO 0.649 0.657 0.692 0.865 0.930
> 60 0.392 0.392 0.428 TBVOOS <60 0.472 0.472 0.532 0.649 0.657 0.692 0.865 0.930
> 60 0.392 0.392 0.428
< 60 0.472 0.472 0.532 TBVOOS SLO 0.649 0.657 0.692 0.865 0.930
> 60 0.392 0.392 0.428 TABLE 11-3 AFTO Flow Dependent LHGR Multiplier LHGRFAC(F)
(Asymmetric Feedwater Heating)
(References 2, 4, 8, 9 and 13)
Core Flow (% of rated)
EOOS Combination 0 25 33.60 70 80 110 LHGRFAC(F) Multiplier Dual Loop 0.470 0.626 0.679 0.905 0.930 0.930 Single Loop 0.470 0.626 0.679 0.679 0.679 0.679 MCPR LIMITS The Operating Limit MCPR (OLMCPR) for use in Technical Specification 3.2.2 for each fuel type during asymmetric feedwater temperature operation are provided in Tables 11-4 and 11-5. The penalty is being applied to the values in these Tables instead of applying the penalty to the K(p) multipliers. The ARTS-based power-dependent MCPR limits, OLMCPR(P), for use in Technical Specification 3.2.2 during asymmetric feedwater temperature operation are provided in Table 11-6. Table 11-6 is valid for maximum 90'F FWTR, with a maximum temperature differential of 550 F between the two feedwater sparger lines. The flow-dependent MCPR limits, OLMCPR(F), for AFTO are provided in Table 11-7. Table 11-7 is valid for all operating conditions with AFTO from BOC to EOC. The power and flow-dependent OLMCPR curves were obtained from References (9, 11, 18 and 20) and were adjusted with a 4% penalty as per Reference (13) and (17).
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 18 of 22 Rev. 2 TABLE 11-4 AFTO Operating Limit Minimum Critical Power Ratio-GE14 (Reference 2, 4, 9, 11 and 13)
SCRAM Cycle Exposure Time < EOR- 3000 > EOR -3000 EOOS Combination Option*') MWd/ST MWd/ST B 1.37 1.44 BASE A 1.40 1.47 B 1.44(3) 1.46 BASE SLO(2) A 1.44(3) 1.49 B 1.42 1.52 TBVOOS A 1.46 1.55 B 1.45 1.54 TBVOOS SLO(21 A 1.48 1.57 B 1.44 1.52 RPTOOS A 1.55 1.70 B 1.46 1.54 RPTOOS SLO(2) A 1.57 1.72 TABLE 11-5 AFTO Operating Limit Minimum Critical Power Ratio -GNF2 (Reference 2, 4, 9, 11 and 13)
SCRAM Cycle Exposure Time < EOR- 3000 > EOR- 3000 1
EOOS Combination Option( ) MWd/ST MWd/ST B 1.37 1.45 BASE A 1.40 1.48 B 1.44(3) 1.47 BASE SLO(2) A 1.44(3) 1.50 B 1.44 1.52 TBVOOS A 1.47 1.55 B 1.46 1.54 TBVOOS SLO(2) A 1.49 1.57 B 1.45 1.53 RPTOOS A 1.56 1.71 B 1.47 1.55 RPTOOS SLO(2) A 1.58 1.73
- 1. When Tau does not equal 0 or 1, use linear interpolation.
- 2. For single-loop operation, the MCPR operating limit is 0.02 greater than the two loop value except when the Two Loop Operation MCPR operating limit is less than 1.36 (consistent with Reference 15).
- 3. OLMCPR limit set by the Single Loop Operation (SLO) - Recirculation Pump Seizure Analysis. (Reference 15)
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 19 of 22 Rev. 2 TABLE 11-6 AFTO Power Dependent MCPR Limit Adjustments And Multipliers (Asymmetric Feedwater Heating)
(Reference 9, 11, 13, 17 and 20)
Core Core Thermal Power (% of rated)
EOOS Combination Flow (% 0 25 1 <30 >30 40 55 65 100 of rated) Operating Limit MCPR Operating Limit MCPR Multiplier, Kp
< 60 2.55 2.55 2.45 Base < 1.340 1.286 1.256 1.131 1.000
> 60 2.81 2.81 2.60
< 60 2.57 2.57 2.48 Base SLO 1.340 1.286 1.256 1.131 1.000
> 60 2.83 2.83 2.62
< 60 3.32 3.32 2.81 RPTOOS < 1.570 1.440 1.335 1.131 1.000
> 60 3.83 3.83 3.32
< 60 3.34 3.34 2.83 RPTOOS SLO < 1.570 1.440 1.335 1.131 1.000
> 60 3.85 3.85 3.34
< 60 3.32 3.32 2.81 TBVOOS < 1.570 1.440 1.335 1.131 1.000
> 60 3.83 3.83 3.32
< 60 3.34 3.34 2.83 TBVOOS SLO 1.570 1.440 1.335 1.131 1.000
> 60 3.85 3.85 3.34 TABLE 11-7 AFTO Flow Dependent MCPR Limits MCPR(F)
(Asymmetric Feedwater Heating)
(Reference 9, 11, 13, 17, 18)
Flow MCPR(F)
(% rated) Limit 0.0 1.776 79.06 1.300 110.0 1.300
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 20 of 22 Rev. 2 MAPLHGR LIMITS A 7% penalty is applied to all MAPLHGR limits for all conditions under asymmetric feedwater temperature operation (AFTO) as per Reference (13). The penalty is being applied as a 0.930 multiplier for all conditions, except single-loop operation (SLO), in Table 11-8. For single-loop operation, the AFTO multiplier is also applied to the MAPLHGR limits, in Table 11-9. The SLO multiplier (0.73) from Reference (2) is multiplied by the AFTO multiplier (0.93) in Table 11-8. Therefore, the SLO MAPLHGR multiplier is clamped at 0.679 as shown in Table 11-9 to ensure peak clad temperatures are maintained within the limits of the cycle-specific LOCA analysis for single recirculation loop and asymmetric feedwater temperature operation.
TABLE 11-8 AFTO MAPLHGR Reduction Factor Valid For All Conditions Except Single Loop (Reference 2 and 13)
AFTO Reduction Factor 0.93 TABLE 11-9 AFTO MAPLHGR Single Loop Operation (SLO) Reduction Factor (Reference 2 and 13)
SLO AFTO Reduction 0.679 Factor
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 21 of 22 Rev. 2 12.0 MODES OF OPERATION Peach Bottom Atomic Power Station has been analyzed to operate with a number of operational flexibility features, including Increased Core Flow, Maximum Extended Load Line Limit, Coastdown, EOC Recirculation Pump Trip and Option A/B MCPR Limits, and asymmetric feedwater heating. Peach Bottom Atomic Power Station has also been analyzed to operate with a number of equipment out-of-service conditions, including Turbine Bypass Valves OOS, Single Loop Operation, Feedwater Heating OOS, and Final Feedwater Temperature Reduction. Operation is allowed in any combination of these operational flexibility features and equipment out-of-service conditions, with one EXCEPTION, which is that Peach Bottom may NOT operate with EOC-Recirculation Pump Trip out-of-service in conjunction with Turbine Bypass Valves OOS. Further information on the cycle specific analyses for Peach Bottom 3 Cycle 16 and the associated operating domains discussed above is available in Reference 2.
13.0 METHODOLOGY The analytical methods used to determine the core operating limits shall be those previously reviewed and approved by the NRC, specifically those described in the following document:
- 1. "General Electric Standard Application for Reactor Fuel", NEDE-24011-P-A-14, June 2000 and U.S.
Supplement NEDE-2401 1-P-A- 14-US, June 2000.
14.0 REFERENCES
- 1. "Technical Specifications for Peach Bottom Atomic Power Station Unit 3", Docket No. 50-278, Appendix A to License No. DPR-56.
- 2. "Supplemental Reload Licensing Report for Peach Bottom 3, Reload 15, Cycle 16", GNF Document No.
0000-0035-8372-SRLR, Revision 0, August 2005.
- 3. "General Electric Standard Application for Reactor Fuel", NEDE-2401 I-P-A-14, June 2000; and NEDE-24011-P-A-14-U S, June 2000.
- 4. "Maximum Extended Load Line Limit and ARTS Improvement Program Analyses for Peach Bottom Atomic Power Station Unit 2 and 3", NEDC-32162P, Revision 2, March 1995.
- 5. "Letter from R. M. Butrovich to H. J. Diamond, "Peach Bottom-2 Cycle 11 Turbine Bypass Valve Capacity Variation from Design Basis", January 9, 1995.
- 6. Letter from G. V. Kumar to G. C. Storey, "PBAPS Evaluation of Turbine Bypass Surveillance Requirements", January 19, 1995.
- 8. "Peach Bottom Atomic Power Station Evaluation for Extended Final Feedwater Temperature Reduction of 900 F", NEDC-32707P, Supplement 1, May 1998.
- 9. "ARTS Flow-Dependent Limits with TBVOOS for Peach Bottom Atomic Power Station and Limerick Generating Station", NEDC-32847P, June 1998.
Non-Proprietary Information Submitted in Accordance with 10 CFR 2.390 DOC ID: COLR Peach Bottom 3 Page 22 of 22 Rev. 2
- 10. PECO Calculation PE-0173, "Determination of Total Time Required to Initiate the Trip Signal to the EOC-RPT Circuit Breaker".
- 11. "Peach Bottom Atomic Power Station Units 2 and 3 Plant and Cycle Independent ARTS Thermal Limits Analysis", NEDC - 32162P, Supplement 1, Revision 0, August 2001.
- 12. PECO Calculation PE-025 1, Revision 1, "Power Range Neutron Monitoring System Setpoint Calculations, Peach Bottom Atomic Power Station Units 2 and 3".
- 13. "Safety Review for Peach Bottom Atomic Power Station Units 2 and 3 Asymmetric Feedwater Temperature Operation", NEDC-32691P, Revision 0, May 1997.
- 15. "GE14 Fuel Design Cycle-Independent Analyses for Peach Bottom Atomic Power Station Units 2 & 3,"
GENE L 12-00880-00-0 1P, September 2000
- 16. "Fuel Bundle Information Report for Peach Bottom 3 Reload 15 Cycle 16", GNF Document No. 0000-0035-8372-FIBR, Revision 0, August 2005
- 18. "Letter from F. T. Bolger to C. P. Collins, "Removal of MCPR(F) Low Flow Correction in NEDC-32847P", February 4, 2002.
- 19. "Reactor Stability Detect and Suppress Solutions Licensing Basis Methodology for Reload Applications", NEDO-32465-A, August 1996.
- 20. "Peach Bottom 2 and 3 Off-Rated Analyses Below the PLU Power Level", GE-NE-0000-0041-8205-RO, August 2005
- 22. "OPL-3 Form for Peach Bottom 3 Cycle 16", GNF Document No. 0000-0038-4643, May 2, 2005