RA24-006, Cycle 21 Core Operating Limits Reports
| ML24071A113 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/11/2024 |
| From: | Van Fleet J Constellation Energy Generation |
| To: | Office of Nuclear Reactor Regulation, NRC/RGN-III, Document Control Desk |
| References | |
| RA24-006 | |
| Download: ML24071A113 (1) | |
Text
LaSalle County Station 2601 North 21 " Road Constellation Marse illes. IL 61341 815-415-2000 Telephone
RA24-006 10 CFR 50.4
March 11, 2024
U.S. Nuclear Regulatory Commission Attention: NRC Region Ill Administrator 2443 Warrenville Road, Suite 210 Lisle, IL 60532-4352
LaSalle County Station, Unit 1 Renewed Facility Operating License No. NPF-11 NRC Docket Nos. 50-373
Subject:
Unit 1 Cycle 21 Core Operating Limits Reports
In accordance with LaSalle County Station (LSCS) Technical Specifications (TS) 5.6.5.d, "CORE OPERATING LIMITS REPORT (COLR)," attached is a copy of the Unit 1 Revision 21 COLR. The Unit 1 COLR was revised for LSCS Unit 1 Cycle 21 (L 1C21).
There are no regulatory commitments contained within this letter.
Should you have any questions concerning this letter, please contact Ms. Laura Ekern, Regulatory Assurance Manager, at (815) 415-2800.
Respectfully, ff,,<'Vwt~
John Van Fleet Site Vice President LaSalle County Station
Enclosure:
LaSalle Unit 1 COLR revision 21
cc: Regional Administrator - NRC Region Ill NRC Senior Resident Inspector - LaSalle County Station COLR LaSalle 1 Rev 21
Core Operating Limits Report
For
LaSalle Unit 1 Cycle 21
Digitally s igned by Hackett,
Hackett, Alexandra Alexandra Co-Prepared By: Date : 2024.03.01 15 :00:30 *06'00' Date : _____ _
Alex Hackett, NF CM Vaughn, Edward Digitally signed by Vaughn, Edward James Co-Prepared By: James Date: 2024.03.01 15 :11 :49 -06'00' Date: _____ _
EJ Vaughn, NF CM
Digitally signed by Eastmond, Ann Reviewed By: Ea St m O n d Ann, Date : 2024.03.01 15 :13 :49 *06'00' Date: _____ _
Ann Eastmond, NF CM
Digitally signed by Butler,
Christopher James Reviewed By: Date: 2024.03.01 16:19:29 -05 '00' Date: _____ _
Chris Butler, ESA Rash, Eric J 2024-03-0115 :27-06 :00 Reviewed By: Date : _____ _
Eric Rash, RE
-:,.---p1 /,.-/ Heverly, Matthew M
_,,, <' ' ~ 2024.03.01 17:01 :21 -05'00' L Date : _____ _
Approved By :
Matt Heverly, NF CM Station Qualified ~ 2024-03-01 18 :25-06:00
- Wise, Aaron R.
Review By: Date : _____ _
Aaron Wise, RE
Page 1 of 26 COLR LaSalle 1 Rev 21
Table of Contents
Page Record of COLR LaSalle 1 Cycle 21 Revisions................................................................................... 3 List of Tables....................................................................................................................................... 4
- 1. Terms and Definitions...................................................................................................................... 5
- 2. General Information......................................................................................................................... 7
- 3. MAPLHGR...................................................................................................................................... 8
- 4. MCPR............................................................................................................................................. 9
- 4. 1. MCPR Limits........................................................................................................................... 9 4.1.1. Power-Dependent MCPR............................................................................................ 9 4.1.2. Flow-Dependent MCPR............................................................................................... 9 4.1.3. Safety Limit MCPR...................................................................................................... 9 4.2. Scram Time............................................................................................................................ 10 4.3. Recirculation Flow Control Valve Settings............................................................................. 11
- 5. LHGR............................................................................................................................................ 16
- 6. Rod Block Monitor......................................................................................................................... 21 7. Traversing In-Core Probe System................................................................................................ 22
- 7. 1. Description............................................................................................................................ 22 7.2. Bases.................................................................................................................................... 22
- 8. Stability Protection Setpoints......................................................................................................... 23 9. Modes of Operation....................................................................................................................... 24
- 10. Methodology................................................................................................................................ 25
- 11. References.................................................................................................................................. 26
Page 2 of 26 COLR LaSalle 1 Rev 21
Record of COLR LaSalle 1 Cycle 21 Revisions
Revision Description
21 Initial issuance for L 1 C21.
Page 3 of 26 COLR LaSalle 1 Rev 21
List of Tables
Table 2-1 Cycle Exposure Range Definitions......................................................................................... 7 Table 3-1 MAPLHGR versus Average Planar Exposure for GNF2 Fuel................................................. 8 Table 3-2 MAPLHGR versus Average Planar Exposure for GNF3 Fuel................................................. 8 Table 3-3 MAPLHGR SLO Multiplier for GNF2 and GNF3 Fuel............................................................. 8 Table 4-1 Scram Times Required for Option A and Option B Application at Notch Position 39............ 10 Table 4-2 Operating Limit Minimum Critical Power Ratio (OLMCPR) for GNF2 and GNF3 Fuel.......... 12 Table 4-3 Power Dependent MCPR Multipliers (KP) for GNF2 and GNF3 Fuel.................................... 13 Table 4-4 DLO Flow Dependent MCPR Limits (MCPRF) for GNF2 Fuel.............................................. 14 Table 4-5 DLO Flow Dependent MCPR Limits (MCPRF) for GNF3 Fuel.............................................. 14 Table 4-6 SLO Flow Dependent MCPR Limits (MCPRF) for GNF2 Fuel............................................... 14 Table 4-7 SLO Flow-Dependent MCPR Limits (MCPRF) for GNF3 Fuel.............................................. 15 Table 4-8 Cycle Specific SLMCPR (MCPRss.s%).................................................................................. 15 Table 5-1 LHGR Limit for GNF2 Fuel................................................................................................... 16 Table 5-2 LHGR Limit for GNF3 Fuel................................................................................................... 16 Table 5-3 Power Dependent LHGR Multipliers (LHGRFACp) for GNF2 Fuel, DLO and SLO............... 17 Table 5-4 Power Dependent LHGR Multipliers (LHGRFACp) for GNF3 Fuel, DLO and SLO............... 18 Table 5-5 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 Fuel, BOC to EOC, All Application Groups except Base Case with TCVIS or Base Case + MS ROOS with TCVIS.................... 19 Table 5-6 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 Fuel, BOC to EOC, Base Case with TCVIS or Base Case+ MSROOS with TCVIS.............................................................. 19 Table 5-7 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF3 Fuel, BOC to EOC, All Cases... 20 Table 6-1 Rod Block Monitor Setpoints................................................................................................ 21 Table 8-1 OPRM PBDA Trip Setpoints................................................................................................ 23 Table 9-1 Allowed Modes of Operation and EOOS Combinations....................................................... 24
Page 4 of 26 COLR LaSalle 1 Rev 21
- 1. Terms and Definitions
ARO All Rods Out ARTS Average Power Range Monitor, Rod Block Monitor and Technical Specification Improvement Program BOC Beginning of cycle CRD Control rod drive DLO Dual loop operation EOC End of cycle EOOS Equipment out of service EOR End of rated - Cycle exposure corresponding to all rods out, 100% power/100%
flow, and normal feedwater temperature FFWTR Final feedwater temperature reduction FWHOOS Feedwater heater out of service GNF Global Nuclear Fuels - Americas ICF Increased core flow KP Power-dependent MCPR multiplier L 1C21 LaSalle Unit 1 Cycle 21 LHGR Linear heat generation rate LHGRFACF Flow-dependent LHGR multiplier LHGRFACP Power-dependent LHGR multiplier LOCA Loss of coolant accident LPRM Local power range monitor MAPLHGR Maximum average planar linear heat generation 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 Flow-dependent MCPR Power-dependent MCPR, which is equal to the operating limit MCPR multiplied by KP MELLLA Maximum extended load line limit analysis MOC Middle of cycle point for licensing purposes MSIVOOS Main steam isolation valve out of service MSR Moisture separator reheater MSROOS Moisture separator reheater out of service OLMCPR Operating limit minimum critical power ratio OOS Out of service OPRM Oscillation power range monitor PBDA Period based detection algorithm PLUOOS Power load unbalance out of service PROOS Pressure regulator out of service RPTOOS Recirculation pump trip out of service RWE Rod withdrawal error SLMCPR Safety limit minimum critical power ratio
Page 5 of 26 COLR LaSalle 1 Rev 21
- 1. Terms and Definitions {continued}
SLO Single loop operation SRVOOS Safety/relief valve out of service TBV Turbine bypass valve TBVOOS Turbine bypass valve out of service TCV Turbine control valve TCVIS All Turbine Control Valves/Turbine Stop Valves in-service TCVSC Turbine control valve slow closure TIP Traversing in-core probe TSV Turbine stop valve 30M 3D Monicore
Page 6 of 26 COLR LaSalle 1 Rev 21
- 2. General Information
The data provided in this report is valid for:
- Maximum Extended Load Line Limit down to 82.8% of rated core flow during full power operation (rated core flow is 108.5 Mlbm/hr) (Reference 6)
- ICF to 105% of rated core flow (Reference 7)
- Coastdown to 40% rated power (rated core thermal power is 3546 Mvvth) (Reference 7) o Operation at a power level above that which can be achieved with ARO, ICF, FFWTR, and steady-state equilibrium Xenon concentrations is not supported
- Maximum reduction of 100°F of the feedwater temperature for FWHOOS/FFWTR (Reference 7)
Throughout this report, power and flow dependent limits are listed for various power and flow levels.
Linear interpolation is to be used to find intermediate values.
Table 2-1 defines the three exposure ranges used in the COLR. The term (EOR21 - 5447 MWd/ST) means the projected Cycle 21 EOR exposure minus 5447 MWd/ST of exposure. The value of the EOR exposure is based on actual plant operation and is thus determined from projections to this condition made near, but before, the time when the EOR21 - 5447 MWd/ST exposure will be reached. For cycle exposure dependent limits at the exact MOC exposure, the more limiting of the BOC to MOC and the MOC to EOC limits should be used. This can be achieved by applying the MOC to EOC limits to the MOC point as all cycle exposure dependent limits in the MOC to EOC limit sets are the same as, or more limiting than, those in the BOC to MOC limit sets.
Table 2-1 Cycle Exposure Range Definitions (Reference 7)
Nomenclature Cycle Exposure Range
BOC to MOC BOC21 to (EOR21 -5447 MWd/ST)
MOCtoEOC (EOR21 - 5447 MWd/ST) to EOC21 BOC to EOC BOC21 to EOC21
Page 7 of 26 COLR LaSalle 1 Rev 21
- 3. MAPLHGR
Technical Specification Sections 3.2.1 and 3.4.1
MAPLHGR values as a function of average planar exposure are given in Tables 3-1 and 3-2. During SLO, these limits are multiplied by the SLO multiplier listed in Table 3-3. Tables 3-1, 3-2, and 3-3 provide coverage for all modes of operation.
Table 3-1 MAPLHGR versus Average Planar Exposure for GNF2 Fuel (Reference 7)
Average Planar MAPLHGR Limit Exposure (kW/ft)
(GWd/ST) 0.00 13.78
- 17. 15 13.78 60.78 6.87 63.50 5.50
Table 3-2 MAPLHGR versus Average Planar Exposure for GNF3 Fuel (Reference 7)
Average Planar MAPLHGR Limit Exposure (kW/ft)
(GWd/ST) 0.00 14.36 21.22 13.01 40.82 10.75 57.60 8.00 63.50 6.00
Table 3-3 MAPLHGR SLO Multiplier for GNF2 and GNF3 Fuel (Reference 7)
SLO Fuel Type MAPLHGR Multiplier GNF2 0.78 GNF3 0.90
Page 8 of 26 COLR LaSalle 1 Rev 21
- 4. MCPR Technical Specification Sections 3.2.2, 3.3.4.1, 3.4.1, and 3. 7. 7
4.1. MCPR Limits
The rated OLMCPRs given in Table 4-2 are the maximum values obtained from analysis of the pressurization events, non-pressurization events, and the Option Ill stability evaluation. MCPR values are determined by the cycle-specific fuel reload analyses in Reference 7. Table 4-2 is used in conjunction with the ARTS-based power (Kp) and flow (MCPRF) dependencies presented in Tables 4-3, 4-4, 4-5, 4-6, and 4-7 below. The OLMCPR is determined for a given power and flow condition by evaluating the power and flow dependent MCPR values and selecting the greater of the two.
4.1.1. Power-Dependent MCPR The power-dependent MCPR multiplier, KP, is determined from Table 4-3, and is dependent only on the power level and the Application Group (EOOS). The product of the rated OLMCPR and the proper KP provides the power-dependent OLMCPR.
4.1.2. Flow-Dependent MCPR Tables 4-4 through 4-7 give the MCPRF limit as a function of the core flow, based on the applicable plant conditions. The MCPRF limit determined from these tables is the flow dependent OLMCPR.
4.1.3. Safety Limit MCPR The cycle-specific SLMCPR, known as MCPR99.9%, can be found in Table 4-8 for dual loop and single loop operating conditions. The values in Table 4-8 were used to calculate the rated and off-rated MCPR limits.
Page 9 of 26 COLR LaSalle 1 Rev 21
4.2. Scram Time Option A and Option B MCPR analyses and results are dependent upon core average control rod blade scram speed insertion times.
The Option A scram time is the Improved Technical Specification scram speed based insertion time. To utilize the MCPR limits for the Option A scram speed insertion times, the core average scram speed insertion time for 20% insertion must be less than or equal to 0.900 seconds (Reference 10) (0.875 seconds at notch position 39, Reference 11).
To utilize the MCPR limits for the Option B scram speed insertion times, the core average scram speed time for insertion to notch 39 must be less than or equal to TB (Reference 14, see equation 1).
1 or r 8 = 0.603 + 1.65 ( ~:.) 0.0106 (1)
"-'*=1 N,
Whereµ (0.603 sec for LaSalle) is the mean of means plus two standard deviations scram insertion time to notch position 39 dropout and u (0.0106 sec for LaSalle) is the standard deviation of the distribution for average scram insertion time to notch position 39 dropout used in the Option B scram speed statistical analysis, and where n is the number of surveillance tests performed in the cycle, Ni is the number of active control rods measured in surveillance test i, and N1 is the total number of active rods measured.
Alternatively, to use Option 8, omitting the right-hand side of the TB equation would be conservative, and is acceptable. See Table 4-1 for a summary of scram time requirements related to the use of Option A and Option B MCPR limits.
If the core average scram insertion time does not meet the Option B criteria, but is within the Option A criteria, the appropriate steady state MCPR value may be determined from a linear interpolation between the Option A and B limits with standard mathematical rounding to two decimal places.
Table 4-1 Scram Times Required for Option A and Option B Application at Notch Position 39 (References 11 and 14)
Notch Position* Scram Time Required for Option A Scram Time Required for Option B Application (sec) Application (sec)**
~ 0.603 OR 39 ~ 0.875 (rt:
- S 0.603 + 1.65 NJ 0.0106
'\\I
- The insertion time to a notch position is conservatively calculated using the CRD reed switch drop-out time per Reference 11 and interpolation with scram time values per Reference 10.
Page 10 of 26 COLR LaSalle 1 Rev 21
4.3. Recirculation Flow Control Valve Settings Cycle 21 was analyzed with a maximum core flow runout of 105%; therefore, the recirculation pump flow control valves must be set to maintain core flow less than 105% (113.925 Mlbm/hr) for all runout events (Reference 6).
Page 11 of 26 COLR LaSalle 1 Rev 21
Table 4-2 Operating Limit Minimum Critical Power Ratio (OLMCPR) for GNF2 and GNF3 Fuel (Reference 7)
Application Group DLO/ Exposure Range Option A Option B SLO
DLO BOC-EOC 1.37 1.31 Base Case SLO BOC-EOC 1.59 1.59
Base Case + TCVSC DLO BOC-EOC 1.41 1.35
+ RPTOOS + PROOS +
MSROOS SLO BOC-EOC 1.59 1.59
Base Case + TCVSC + MOC-EOC 1.40 1.34 DLO BOC-MOC 1.39 1.33
TBVOOS (all 5 valves) SLO BOC-MOC 1.59 1.59 MOC-EOC 1.59 1.59 Base Case + TCVSC + DLO BOC-EOC 1.44 1.40 TBVOOS (all 5 valves)
+ RPTOOS + PROOS + SLO BOC-EOC 1.59 1.59 MSROOS
DLO BOC-EOC 1.37 1.31 Base Case with TCVIS SLO BOC-EOC 1.59 1.59
Base Case + TCVSC + DLO BOC-EOC 1.44 1.40 TBVOOS (all 5 valves)
+ RPTOOS + PROOS + SLO BOC-EOC 1.59 1.59 MSROOS with TCVIS
DLO BOC-EOC 1.39 1.33 Base Case + MSROOS SLO BOC-EOC 1.59 1.59
Base Case + MSROOS DLO BOC-EOC 1.39 1.33 with TCVIS SLO BOC-EOC 1.59 1.59
Page 12 of 26 COLR LaSalle 1 Rev 21
Table 4-3 Power Dependent MCPR Multipliers (KP) for GNF2 and GNF3 Fuel (Reference 7)
Core Thermal Power (% rated)
0 I 25 I 45 I 60 I S 85 I > 85 I 100 Application Group
KP, Operating Limit MCPR Multiplier
Base Case 1.150 1.150 1.150 1. 150 1.056 1.056 1.000
Base Case + TCVSC
+ RPTOOS + 1.242 1.242 1.207 1.178 1.111 1.064 1.000 PROOS + MSROOS
Base Case + TCVSC
+ TBVOOS (all 5 1.150 1.150 1.150 1.150 1.058 1.058 1.000 valves)
Base Case + TCVSC
+ TBVOOS (all 5 1.242 1.242 1.207 1. 178 1.111 1.070 1.000 valves)+ RPTOOS +
PROOS + MSROOS
Base Case with 1.150 1.150 1.150 1.150 1.056 1.056 1.000 TCVIS
Base Case + TCVSC
+ TBVOOS (all 5 valves)+ RPTOOS + 1.242 1.242 1.207 1.178 1.111 1.070 1.000 PROOS + MSROOS with TCVIS
Base Case+ 1.242 1.242 1.207 1.178 1.111 1.070 1.000 MSROOS
Base Case+
MSROOSwith 1.242 1.242 1.207 1. 178 1.111 1.070 1.000 TCVIS
Page 13 of 26 COLR LaSalle 1 Rev 21
Table 4-4 DLO Flow Dependent MCPR Limits (MCPRF) for GNF2 Fuel (Reference 7)
Flow MCPRF
(% Rated) Limit
0.0 1.88
30.0 1.70
105.0 1.24*
Table 4-5 DLO Flow Dependent MCPR Limits (MCPRF) for GNF3 Fuel (Reference 7)
Flow MCPRF
(% Rated) Limit
0.0 1.78
30.0 1.58
86.3 1.20*
105.0 1.20*
Table 4-6 SLO Flow Dependent MCPR Limits (MCPRF) for GNF2 Fuel (Reference 7)
Flow MCPRF
(% Rated)
0.0 1.91
30.0 1.73
105.0 1.27
- This value is lower than the initial MCPR analyzed in the LOCA analysis. However, because PANACEA calculates the offrated MCPR by taking the maximum of the MCPRp, MCPRf, and OLMCPR, the offrated MCPR is inherently higher than analyzed in the LOCA analysis and the LOCA analysis remains applicable at all conditions.
Page 14 of 26 COLR LaSalle 1 Rev 21
Table 4-7 SLO Flow-Dependent MCPR Limits (MCPRF) for GNF3 Fuel (Reference 7)
Flow MCPRF
(% Rated)
0.0 1.81
30.0 1.61
86.3 1.23*
105.0 1.23*
- This value is lower than the initial MCPR analyzed in the LOCA analysis. However, because PANACEA calculates the offrated MCPR by taking the maximum of the MCPRp, MCPRf, and OLM CPR, the offrated MCPR is inherently higher than analyzed in the LOCA analysis and the LOCA analysis remains applicable at all conditions.
Table 4-8 Cycle Specific SLMCPR (MCPR99.9%)
(Reference 7)
Flow MCPR99.9%
DLO 1.09
SLO 1.12
Page 15 of 26 COLR LaSalle 1 Rev 21
- 5. LHGR
Technical Specification Sections 3.2.3 and 3.4.1
The LHGR limit is the product of the exposure dependent LHGR limit from Table 5-1 or Table 5-2 and the minimum of the power dependent LHGR Factor, LHGRFACP, or the flow dependent LHGR Factor, LHGRFACF, as applicable. The LHGRFACp multiplier is determined from Table 5-3 or Table 5-4. The LHGRFACF multiplier is determined from Table 5-5, Table 5-6, or Table 5-7. The SLO multipliers in Table 5-5 and Table 5-6 have been limited to a maximum value of 0.78, the SLO LHGR multiplier for GNF2 fuel. The SLO multipliers in Table 5-7 have been limited to a maximum value of 0.90, the SLO LHGR multiplier for GNF3 fuel (Reference 7).
Table 5-1 LHGR Limit for GNF2 Fuel (References 5 and 8)
Peak Pellet j U02 LHGR Limit Exposure See Table 8-1 of Reference 8
Peak Pellet j Gadolinia LHGR Exposure Limit See Table 8-2 of Reference 8
Table 5-2 LHGR Limit for GNF3 Fuel (References 5 and 9)
Peak Pellet j U02 LHGR Limit Exposure See Table A-1 of Reference 9
Peak Pellet j Gadolinia LHGR Exposure Limit See Table A-2 of Reference 9
Page 16 of 26 COLR LaSalle 1 Rev 21
Table 5-3 Power Dependent LHGR Multipliers (LHGRFACp) for GNF2 Fuel, DLO and SLO (Reference 7)
Core Thermal Power (% rated)
Application Group 0 I 25 I 45 I 60 I 85 I 100
LHGRFACP Multiplier
Base Case 0.608 0.608 0.713 0.791 0.922 1.000
Base Case+
TCVSC + RPTOOS 0.608 0.608 0.703 0.761 0.831 1.000
+ PROOS +
MSROOS Base Case+
TCVSC + TBVOOS 0.608 0.608 0.713 0.791 0.922 1.000 (all 5 valves)
Base Case+
TCVSC + TBVOOS (all 5 valves)+ 0.608 0.608 0.703 0.761 0.822 1.000 RPTOOS + PROOS
+ MSROOS
Base Case with 0.608 0.608 0.713 0.791 0.922 1.000 TCVIS
Base Case+
TCVSC + TBVOOS (all 5 valves) + 0.608 0.608 0.703 0.761 0.822 1.000 RPTOOS + PROOS
+ MSROOS with TCVIS
Base Case+ 0.608 0.608 0.713 0.791 0.922 1.000 MSROOS
Base Case+
MSROOS with 0.608 0.608 0.713 0.791 0.922 1.000 TCVIS
Page 17 of 26 COLR LaSalle 1 Rev 21
Table 5-4 Power Dependent LHGR Multipliers (LHGRFACp) for GNF3 Fuel, DLO and SLO (Reference 7)
Core Thermal Power (% rated)
Application Group 0 25 45 I 60 I 85 I 100
LHGRFACp Multiplier
Base Case 1.000 1.000 1.000 1.000 1.000 1.000
Base Case+
TCVSC + RPTOOS 0.720 0.720 0.850 0.940 1.000 1.000
+ PROOS +
MSROOS Base Case+
TCVSC + TBVOOS 0.955 0.955 0.955 1.000 1.000 1.000 (all 5 valves)
Base Case+
TCVSC + TBVOOS (all 5 valves) + 0.720 0.720 0.850 0.940 1.000 1.000 RPTOOS + PROOS
+ MSROOS
Base Case with 1.000 1.000 1.000 1.000 1.000 1.000 TCVIS
Base Case+
TCVSC + TBVOOS (all 5 valves) + 0.720 0.720 0.850 0.940 1.000 1.000 RPTOOS + PROOS
+ MSROOS with TCVIS
Base Case+ 0.720 0.720 0.850 0.940 1.000 1.000 MSROOS
Base Case+
MSROOS with 0.720 0.720 0.850 0.940 1.000 1.000 TCVIS
Page 18 of 26 COLR LaSalle 1 Rev 21
Table 5-5 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 Fuel, BOC to EOC, All Application Groups except Base Case with TCVIS or Base Case+ MSROOS with TCVIS (Reference 7)
Flow DLO LHGRFACF SLO LHGRFACF
(% Rated)
0.0 0.11 0.11
30.0 0.41 0.41
67.0 0.78 0.78
89.0 1.00 0.78
105.0 1.00 0.78
Table 5-6 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 Fuel, BOC to EOC, Base Case with TCVIS or Base Case + MSROOS with TCVIS (Reference 7)
Flow DLO LHGRFACF SLO LHGRFACF
(% Rated)
0.0 0.25 0.25
30.0 0.55 0.55
53.0 0.78 0.78
75.0 1.00 0.78
105.0 1.00 0.78
Page 19 of 26 COLR LaSalle 1 Rev 21
Table 5-7 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF3 Fuel, BOC to EOC, All Cases (Reference 7)
Flow DLO LHGRFACF SLO LHGRFACF
(% Rated)
0.00 0.307 0.307
30.00 0.584 0.584
64.18 0.900 0.900
75.00 1.000 0.900
105.00 1.000 0.900
Page 20 of 26 COLR LaSalle 1 Rev 21
- 6. Rod Block Monitor
Technical Specification Sections 3.3.2.1 and 3.4.1
The Rod Block Monitor Upscale Instrumentation Setpoints are determined from the relationships shown below.
Table 6-1 Rod Block Monitor Setpoints (Reference 3)
Rod Block Monitor Upscale Trip Function Allowable Value Two Recirculation Loop 0.66 Wd + 54.0%
Operation Single Recirculation Loop 0.66 Wd + 48.7%
Operation
Wd - percent of recirculation loop drive flow required to produce a rated core flow of 108.5 Mlbm/hr.
The setpoint may be lower/higher and will still comply with the RWE analysis because RWE is analyzed unblocked (Reference 7). The allowable value is clamped with a maximum value not to exceed the allowable value for a recirculation loop drive flow (Wd) of 100%.
Page 21 of 26 COLR LaSalle 1 Rev 21
- 7. Traversing In-Core Probe System (References 2, 4, and 12)
7.1. Description
When the traversing in-core probe (TIP) system (for the required measurement locations) is used for recalibration of the LPRM detectors and monitoring thermal limits, the TIP system shall be operable with the following:
- 1. Movable detectors, drives, and readout equipment to map the core in the required measurement locations, and 2. Indexing equipment to allow all required detectors to be calibrated in a common location.
The following applies for use with 3DM:
At any time, including BOC, the total number of failed and/or bypassed LPRMs does not exceed 25% (Reference 4). In addition, no more than 22 TIP channels can be 00S (failed or rejected)
(Reference 2).
Otherwise, with the TIP system inoperable, suspend use of the system for the above applicable calibration functions.
7.2. Bases
The operability of the TIP system with the above specified minimum complement of equipment ensures that the measurements obtained from use of this equipment accurately represent the spatial neutron flux distribution of the reactor core. The normalization of the required detectors is performed internal to the core monitoring software system.
Page 22 of 26 COLR LaSalle 1 Rev 21
- 8. Stability Protection Setpoints
Technical Specification Section 3.3. 1.3
Table 8-1 OPRM PBDA Trip Setpoints (Reference 7)
PBDA Trip Amplitude Setpoint (Sp) Corresponding Maximum Confirmation Count Setpoint (Np)
1.15 16
The PBDA is the only OPRM setting credited in the safety analysis as documented in the licensing basis for the OPRM system.
The OPRM PBDA trip settings are applicable when the OPRM system is declared operable, and the associated Technical Specifications are implemented.
Page 23 of 26 COLR LaSalle 1 Rev 21
- 9. Modes of Operation The allowed modes of operation with combinations of equipment out-of-service are as described below (Reference 7).
Table 9-1 Allowed Modes of Operation and EOOS Combinations (Reference 7)
Equipment Out of Service Options <1> <2> <3> <4> <5> <6> <7> Short Names
Base Case BASE_DLO _ OPTB(A)
Base Case + SLO BASE_SLO _ OPTB(A)
Base Case + TCVSC + RPTOOS + PROOS + MSROOS EOOS1_DLO_OPTB(A)
Base Case + TCVSC + RPTOOS + PROOS + MSROOS + SLO EOOS1_SLO _ OPTB(A)
Base Case+ TCVSC + TBVOOS (all S valves) EOOS2_DLO _ OPTB(A)
Base Case+ TCVSC + TBVOOS (all S valves)+ SLO EOOS2_SLO _ OPTB(A)
Base Case + TCVSC + TBVOOS (all S valves) + RPTOOS + PROOS + EOOS3_DLO _ OPTB(A)
MSROOS Base Case+ TCVSC + TBVOOS (all S valves)+ RPTOOS + PROOS + EOOS3_SLO _ OPTB(A)
MSROOS + SLO Base Case with TCVIS BASE_ TCVIS_DLO_OPTB(A)
Base Case + SLO with TCVIS BASE_ TCVIS_SLO_OPTB(A)
Base Case+ TCVSC + TBVOOS (all S valves) + RPTOOS + PROOS + EOOS3_ TCVIS_DLO _ OPTB(A)
MSROOS with TCVIS Base Case + TCVSC + TBVOOS (all S valves) + RPTOOS + PROOS + EOOS3_ TCVIS_SLO_OPTB(A)
MSROOS + SLO with TCVIS Base Case + MSROOS EOOS4_DLO _ OPTB(A)
Base Case + MSROOS + SLO EOOS4_SLO _ OPTB(A)
Base Case + MSROOS with TCVIS EOOS4_TCVIS_DLO_OPTB(A)
Base Case + MSROOS + SLO with TCVIS EOOS4_TCVIS_SLO_OPTB(A)
(1) Base case includes 1 SRVOOS + 1 Tcvrrsv 00S + FWHOOS/FFWTR + 1 MSIVOOS + 1 TBVOOS + PLUOOS. The one TCV and/or TSV 00S cond itions require power level s 85% of rated. The one MSIVOOS condition is confirmed for reactor power s 75% of rated (Reference 7).
(2) The 1 TBVOOS in the Base Case assumes one of TBVs #1-4 are not credited for pressure control and one of TBVs #1-5 are not credited for fast opening. The #5 TBV is not available for pressure relief and thus cannot be used as one of the credited valves to open in pressure control (Reference 13).
(3) The 5 TBVOOS application conditions assume three of TBVs #1-4 are not credited for pressure control and all five of TBVs #1-5 are not credited for fast opening. The #5 TBV is not available for pressure relief and thus cannot be used as one of the credited valves to open in pressure control (Reference 13).
(4) The+ sign that is used in the Equipment Out of Service Option I Application Group descriptions designates an "and/or" (Reference 6).
(5) All EOOS Options are applicable to the entire range of licensed flow and feedwater temperature (MELLLA, ICF, FFWTR, and coastdown) unless otherwise specified (Reference 7). SLO is not applicable to MELLLA or ICF.
(6) All EOOS options in Table 9-1 can be used in Option A or B (Reference 7).
(7) MSR is considered to be in-service when second stage reheat is receiving full flow {Reference 15).
Page 24 of 26 COLR LaSalle 1 Rev 21
- 10. 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 documents:
- 1. GNF Report NEDE-24011-P-A-31 (Revision 31 ), "General Electric Standard Application for Reactor Fuel (GESTAR II)," November 2020 and the U.S. Supplement NEDE-24011-P-A-31-US, November 2020.
Page 25 of 26 COLR LaSalle 1 Rev 21
- 11. References
- 1. Constellation Energy Generation, LLC Docket No. 50-373 LaSalle County Station, Unit 1, Renewed Facility Operating License No. NPF-11.
- 2. GNF Report 005N6665, Revision 0, "Exelon BWR Fleetwide Technical Evaluation of 50% TIP Strings Out-of-Service on Methods Uncertainties," March 2020.
- 3. Constellation Nuclear Fuels Letter NFM:MW:01-0106, "LaSalle Unit 1 and Unit 2 Rod Block Monitor COLR Setpoint Change," April 2001.
- 4. GE Nuclear Energy Report NEDC-32694P-A, Revision 0, "Power Distribution Uncertainties for Safety Limit MCPR Evaluations," August 1999.
- 5. GNF Report 007N3282, Revision 0, "Fuel Bundle Information Report for LaSalle Unit 1 Reload 20 Cycle 21," November 2023.
- 6. Constellation Transmittal NF230381, Revision 0, "LaSalle Unit 1 Cycle 21 FRED Form," July 2023.
- 7. GNF Report 007N3281, Revision 0, "Supplemental Reload Licensing Report for LaSalle Unit 1 Reload 20 Cycle 21," December 2023.
- 8. GNF Document No. NEDC-33270P, Revision 11, "GNF2 Advantage Generic Compliance with NEDE-24011-P-A (GESTAR II)," August 2020.
- 9. GNF Document No. NEDC-33879P, Revision 4, "GNF3 Generic Compliance with NEDE-24011-P-A (GESTAR II)," August 2020.
- 10. Constellation Transmittal NF230401, Revision 0, "LaSalle Unit 1 Cycle 21 OPL-3," July 2023.
- 12. NRC Letter, "Issuance of Amendments (TAC Nos. M95156 and M95157)," October 1996.
- 13. Constellation Transmittal ES1900018, Revision 2, "LaSalle GNF3 Nuclear Fuel Transition Design Inputs-F0900 Cycle-Independent Transient Analysis," November 2020.
- 14. GNF Report 005N5612, Revision 0, "LaSalle County Station Option B' Scram Speed Implementation Engineering Report," January 2020.
- 15. Constellation Engineering Change 630152, Revision 1, "GNF3 NFI F0900 MCFA and MSROOS Inputs," November 2020.
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