RA19-021, Cycle 18 Core Operating Limits Report (COLR)

Cycle 18 Core Operating Limits Report (COLR)

ML19080A135
Person / Time
Site:	LaSalle
Issue date:	03/21/2019
From:	Trafton W Exelon Generation Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
RA19-021
Download: ML19080A135 (22)

Text

LaSalle Cou nty Statio n Exelon Generation~

2601 North 21 ' ' Road Marseilles , IL 61341 815-415-2000 Telephone www.exeloncorp .com RA19-021 10 CFR 50.4 March 21, 2019 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 LaSalle County Station, Unit 2 Renewed Facility Operating License No. NPF-18 NRG Docket No. 50-374

Subject:

Unit 2 Cycle 18 Core Operating Limits Report (COLR)

In accordance with LaSalle County Station (LSCS) Technical Specifications (TS) 5.6.5.d, "CORE OPERATING LIMITS REPORT (COLR)," attached is a copy of Revision 16 of the COLR for Unit 2. This report was revised for LSCS Unit 2, Cycle 18.

There are no regulatory commitments contained within this letter.

Should you have any questions concerning this letter, please contact Ms. Dwi Murray, Regulatory Assurance Manager, at (815) 415-2800.

Respectfully, t/if!_ d-t::iL William J. laf~on ( .

Site Vice President LaSalle County Station

Attachment:

Core Operating Limits Report for LaSalle Unit 2, Revision 16 cc: Regional Administrator - NRG Region Ill NRG Senior Resident Inspector - LaSalle County Station

COLR LaSalle 2 Revision 16 Core Operating Limits Report For LaSalle Unit 2 Cycle 18 Prepared By: Date: -2/22/19 Kevin Sitt{ NF CM Reviewed By: ~ Date: - -2/22/19 Megan Doerzbacher, NF CM 2/22/2019 Reviewed By: Date: - - - - -

ChadBum~

Reviewed By: Date: -2/22/2019 Karl Hachmuth, RE ~Jk,;J 25FEB19 Approved By:

SQR By:

Ann;;;:_zM Date: - - - - -

Date:

J~ Shea, RE LaSalle Unit 2 Cycle 18 Page 1 of 21

COLR LaSalle 2 Revision 16 Table of Contents Page Revision History ..................................................................................................................................3 List of Tables.......................................................................................................................................4

1. References......................................................................................................................................5

2. Terms and Definitions......................................................................................................................6

3. General Information.........................................................................................................................7

4. Average Planar Linear Heat Generation Rate..................................................................................8

5. Operating Limit Minimum Critical Power Ratio.................................................................................9 5.1. Manual Flow Control MCPR Limits..........................................................................................9 5.1.1. Power-Dependent MCPR ............................................................................................9 5.1.2. Flow-Dependent MCPR...............................................................................................9 5.2. Scram Time............................................................................................................................ 10 5.3. Recirculation Flow Control Valve Settings ............................................................................. 10

6. Linear Heat Generation Rate.........................................................................................................14

7. Rod Block Monitor .........................................................................................................................17

8. Traversing In-Core Probe System ................................................................................................18 8.1. Description ............................................................................................................................ 18 8.2. Bases....................................................................................................................................18

9. Stability Protection Setpoints .........................................................................................................19

10. Modes of Operation .....................................................................................................................20

11. Methodology................................................................................................................................21 LaSalle Unit 2 Cycle 18 Page 2 of 21

COLR LaSalle 2 Revision 16 Revision History Record of COLR LaSalle 2 Cycle 18 Revisions Revision Description 16 Initial issuance for L2C18.

LaSalle Unit 2 Cycle 18 Page 3 of 21

COLR LaSalle 2 Revision 16 List of Tables Table 3-1 Cycle Exposure Range Definitions ...................................................................................................7 Table 4-1 MAPLHGR for GNF2 and GNF3 Fuel ..............................................................................................8 Table 4-2 MAPLHGR SLO Multiplier for GNF2 and GNF3 Fuel.......................................................................8 Table 5-1 Scram Times Required for Option A and Option B Application at Notch Position 39 ................... 10 Table 5-2 Operating Limit Minimum Critical Power Ratio (OLMCPR) for GNF2 and GNF3 Fuel ................. 11 Table 5-3 Power-Dependent MCPR Multipliers (KP) for GNF2 and GNF3 Fuel, DLO and SLO, BOC to EOC, Option A and Option B ................................................................... 12 Table 5-4 DLO Flow-Dependent MCPR Limits (MCPRF) for GNF2 and GNF3 Fuel, BOC to EOC, All Application Groups, Option A and Option B ...................................................... 13 Table 5-5 SLO Flow-Dependent MCPR Limits (MCPRF) for GNF2 and GNF3 Fuel, BOC to EOC, All Application Groups, Option A and Option B ...................................................... 13 Table 6-1 LHGR Limit for GNF2 and GNF3 Fuel .......................................................................................... 14 Table 6-2 Power-Dependent LHGR Multipliers (LHGRFACP) for GNF2 and GNF3 Fuel, DLO and SLO ................................................................................................................................ 15 Table 6-3 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 and GNF3 Fuel, BOC to EOC, Pressurization (Application Groups with 1 TCV/TSV Closed or OOS),................. 16 Table 6-4 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 and GNF3 Fuel, BOC to EOC, No Pressurization (Application Groups with TCV/TSV In-Service), ...................... 16 Table 7-1 Rod Block Monitor Setpoints ......................................................................................................... 17 Table 9-1 OPRM PBDA Trip Setpoints.......................................................................................................... 19 Table 10-1 Allowed Modes of Operation and EOOS Combinations................................................................ 20 LaSalle Unit 2 Cycle 18 Page 4 of 21

COLR LaSalle 2 Revision 16

1. References

1. Exelon Generation Company, LLC Docket No. 50-374 LaSalle County Station, Unit 2, Facility Operating License No. NPF-18.

2. Deleted.

3. Exelon Nuclear Fuels Letter NFM:MW:01-0106, LaSalle Unit 1 and Unit 2 Rod Block Monitor COLR Setpoint Change," April 3, 2001.

4. GE Nuclear Energy Report NEDC-32694P-A, Revision 0, Power Distribution Uncertainties for Safety Limit MCPR Evaluations, August 1999.

5. GNF Report 004N5197, Revision 0, Fuel Bundle Information Report for LaSalle Unit 2 Reload 17 Cycle 18, December 2018.

6. Deleted.

7. GNF Report 004N5196, Revision 0, Supplemental Reload Licensing Report for LaSalle Unit 2 Reload 17 Cycle 18, December 2018.

8. GNF Document No. NEDC-33270P Revision 9, GNF2 Advantage Generic Compliance with NEDE-24011-P-A (GESTAR II), December 2017.

9. Exelon Transmittal ES1800020, Revision 0, LaSalle Unit 2 Cycle 18 Completed OPL-3 Form, August 7, 2017.

10. GNF Letter DRF A12-00038-3, Vol. 4, Scram Times versus Notch Position, May 22, 1992.

11. Deleted.

12. NRC Letter, Issuance of Amendments (TAC Nos. M95156 and M95157), October 29, 1996.

LaSalle Unit 2 Cycle 18 Page 5 of 21

COLR LaSalle 2 Revision 16

2. Terms and Definitions ARTS Average Power Range Monitor, Rod Block Monitor and Technical Specification Improvement Program BOC Beginning of cycle CRD Control rod drive mechanism DLO Dual loop operation ELLLA Extended load line limit analysis EOC End of cycle EOOS Equipment out of service EOR18 End of rated operation for Cycle 18 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 L2C18 LaSalle Unit 2 Cycle 18 LHGR Linear heat generation rate LHGRFACF Flow-dependent LHGR multiplier LHGRFACP Power-dependent LHGR multiplier LPRM Local power range monitor MAPLHGR Maximum average planar linear heat generation rate MCFL Maximum combined flow limiter MCPR Minimum critical power ratio MCPRF Flow-dependent MCPR MELLLA Maximum extended load line limit analysis MOC Middle of Cycle Point for Licensing Purposes MSIVOOS Main steam isolation valve 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 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 TIPOOS Traversing in-core probe out of service TSV Turbine stop valve 3DM 3D Monicore LaSalle Unit 2 Cycle 18 Page 6 of 21

COLR LaSalle 2 Revision 16

3. General Information Power and flow dependent limits are listed for various power and flow levels. Linear interpolation is to be used to find intermediate values.

Rated core flow is 108.5 Mlbm/hr. Operation up to 105% rated flow is licensed for this cycle. Licensed rated thermal power is 3546 MWth.

Table 3-1 defines the three exposure ranges used in the COLR. The end of rated (EOR) exposure is defined as the cycle exposure corresponding to all rods out, 100% power/100% flow, and normal feedwater temperature.

The term (EOR18 - 4707 MWd/ST) means the EOR exposure minus 4707 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 EOR18 - 4707 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 3-1 Cycle Exposure Range Definitions (Reference 7)

Nomenclature Cycle Exposure Range BOC to MOC BOC18 to (EOR18 - 4707 MWd/ST)

MOC to EOC (EOR18 - 4707 MWd/ST) to EOC18 BOC to EOC BOC18 to EOC18 LaSalle Unit 2 Cycle 18 Page 7 of 21

COLR LaSalle 2 Revision 16

4. Average Planar Linear Heat Generation Rate Technical Specification Sections 3.2.1 and 3.4.1 MAPLHGR values as a function of average planar exposure are given in Table 4-1. During SLO, these limits are multiplied by the SLO multiplier listed in Table 4-2. The MAPLHGR values in Table 4-1 along with the MAPLHGR SLO multiplier in Table 4-2 provide coverage for all modes of operation.

Table 4-1 MAPLHGR for GNF2 and GNF3 Fuel (Reference 7)

Avg. Planar MAPLHGR Exposure (kW/FT)

(GWd/ST) 0.00 13.78 17.15 13.78 60.78 6.87 63.50 5.50 Table 4-2 MAPLHGR SLO Multiplier for GNF2 and GNF3 Fuel (Reference 7)

SLO Fuel Type MAPLHGR Multiplier GNF2 0.78 GNF3 0.78 LaSalle Unit 2 Cycle 18 Page 8 of 21

COLR LaSalle 2 Revision 16

5. Operating Limit Minimum Critical Power Ratio Technical Specification Sections 3.2.2, 3.3.4.1, 3.4.1, and 3.7.7 5.1. Manual Flow Control MCPR Limits The rated OLMCPRs given in Table 5-2 are the maximum values obtained from analysis of the pressurization events, non-pressurization events, and the Option III stability evaluation. MCPR values are determined by the cycle-specific fuel reload analyses in Reference 7. Table 5-2 is used in conjunction with the ARTS-based power (Kp) and flow (MCPRF) dependencies presented in Tables 5-3, 5-4, and 5-5 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.

5.1.1. Power-Dependent MCPR The power-dependent MCPR multiplier, KP, is determined from Table 5-3, 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.

5.1.2. Flow-Dependent MCPR Tables 5-4 through 5-5 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.

LaSalle Unit 2 Cycle 18 Page 9 of 21

COLR LaSalle 2 Revision 16 5.2. 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. The core average scram speed insertion time for 20% insertion must be less than or equal to the Technical Specification scram speed insertion time to utilize the Option A MCPR limits. Reload analyses performed by GNF for Cycle 18 Option A MCPR limits utilized a 20% core average insertion time of 0.900 seconds (Reference 9).

To utilize the MCPR limits for the Option B scram speed insertion times, the core average scram speed insertion time for 20% insertion must be less than or equal to 0.694 seconds (Reference 9) (0.672 seconds at notch position 39, Reference 10). See Table 5-1 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. When performing the linear interpolation to determine MCPR limits, ensure that the time used for Option A is 0.900 seconds (0.875 seconds to notch position 39, Reference 10).

Table 5-1 Scram Times Required for Option A and Option B Application at Notch Position 39 (References 9 and 10)

Notch Scram Time Required for Option A Scram Time Required for Option B Position* Application Application 39 d 0.875 sec. d 0.672 sec.

• The insertion time to a notch position is conservatively calculated using the CRD reed switch drop-out time per Reference 10.

5.3. Recirculation Flow Control Valve Settings Cycle 18 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 7)

LaSalle Unit 2 Cycle 18 Page 10 of 21

COLR LaSalle 2 Revision 16 Table 5-2 Operating Limit Minimum Critical Power Ratio (OLMCPR) for GNF2 and GNF3 Fuel (References 7)

Application Group DLO/ SLO Exposure Range Option A Option B BOC-MOC 1.39 1.35 DLO MOC-EOC 1.42 1.38 Base Case BOC-MOC 1.59 1.59 SLO MOC-EOC 1.59 1.59 BOC-MOC 1.44 1.36 DLO MOC-EOC 1.48 1.40 Base Case + TCVSC

+ RPTOOS + PROOS BOC-MOC 1.59 1.59 SLO MOC-EOC 1.59 1.59 BOC-MOC 1.41 1.37 DLO MOC-EOC 1.44 1.40 Base Case + TCVSC +

TBVOOS (all 5 valves)

BOC-MOC 1.59 1.59 SLO MOC-EOC 1.59 1.59 BOC-MOC 1.47 1.39 DLO Base Case + TCVSC + MOC-EOC 1.50 1.42 TBVOOS (all 5 valves)

+ RPTOOS + PROOS BOC-MOC 1.59 1.59 SLO MOC-EOC 1.59 1.59 BOC-MOC 1.39 1.35 DLO MOC-EOC 1.42 1.38 Base Case with TCVIS BOC-MOC 1.59 1.59 SLO MOC-EOC 1.59 1.59 BOC-MOC 1.47 1.39 Base Case + TCVSC + DLO TBVOOS (all 5 valves) MOC-EOC 1.50 1.42

+ RPTOOS + PROOS with TCVIS BOC-MOC 1.59 1.59 SLO MOC-EOC 1.59 1.59 LaSalle Unit 2 Cycle 18 Page 11 of 21

COLR LaSalle 2 Revision 16 Table 5-3 Power-Dependent MCPR Multipliers (KP) for GNF2 and GNF3 Fuel, DLO and SLO, BOC to EOC, Option A and Option B (Reference 7)

KP, MCPR Limit Multiplier (as a function of % rated power)

Application Group 0% P 25% P 45% P 60% P 85% P >85%P 100% P Base Case 1.156 1.156 1.156 1.156 1.045 1.045 1.000 Base Case + TCVSC +

1.244 1.244 1.178 1.164 1.077 1.045 1.000 RPTOOS + PROOS Base Case + TCVSC +

1.244 1.244 1.178 1.164 1.077 1.045 1.000 TBVOOS (all 5 valves)

Base Case + TCVSC +

TBVOOS (all 5 valves) 1.244 1.244 1.178 1.164 1.077 1.069 1.000

+ RPTOOS + PROOS Base Case with TCVIS 1.156 1.156 1.156 1.156 1.045 1.045 1.000 Base Case + TCVSC +

TBVOOS (all 5 valves) 1.244 1.244 1.178 1.164 1.077 1.069 1.000

+ RPTOOS + PROOS with TCVIS LaSalle Unit 2 Cycle 18 Page 12 of 21

COLR LaSalle 2 Revision 16 Table 5-4 DLO Flow-Dependent MCPR Limits (MCPRF) for GNF2 and GNF3 Fuel, BOC to EOC, All Application Groups, Option A and Option B (References 7)

Flow MCPRF

(% Rated) 0.0 1.88 30.0 1.70 105.0 1.24*

• 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.

Table 5-5 SLO Flow-Dependent MCPR Limits (MCPRF) for GNF2 and GNF3 Fuel, BOC to EOC, All Application Groups, Option A and Option B (References 7)

Flow MCPRF

(% Rated) 0.0 1.92 30.0 1.74 105.0 1.28 LaSalle Unit 2 Cycle 18 Page 13 of 21

COLR LaSalle 2 Revision 16

6. Linear Heat Generation Rate Technical Specification Sections 3.2.3 and 3.4.1 The LHGR limit is the product of the exposure dependent LHGR limit from Table 6-1 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 6-2. The LHGRFACF multiplier is determined from Table 6-3 or Table 6-4. The SLO multipliers in Table 6-3 and Table 6-4 have been limited to a maximum value of 0.78, the SLO LHGR multiplier for both GNF2 and GNF3 fuel.

Table 6-1 LHGR Limit for GNF2 and GNF3 Fuel (Reference 5 and 8)

Peak Pellet Exposure UO2 LHGR Limit See Table B-1 of Reference 8 Peak Pellet Exposure Most Limiting Gadolinia LHGR Limit See Table B-2 of Reference 8 LaSalle Unit 2 Cycle 18 Page 14 of 21

COLR LaSalle 2 Revision 16 Table 6-2 Power-Dependent LHGR Multipliers (LHGRFACP) for GNF2 and GNF3 Fuel, DLO and SLO (Reference 7)

LHGRFACP (as a function of % rated power)

Application Group 0% P 25% P 45% P 60% P 85% P 100% P Base Case 0.608 0.608 0.713 0.791 0.922 1.000 Base Case + TCVSC +

0.608 0.608 0.703 0.761 0.831 1.000 RPTOOS + PROOS Base Case + TCVSC +

0.608 0.608 0.713 0.791 0.922 1.000 TBVOOS (all 5 valves)

Base Case + TCVSC +

TBVOOS (all 5 valves) 0.608 0.608 0.703 0.761 0.822 1.000

+ RPTOOS + PROOS Base Case with TCVIS 0.608 0.608 0.713 0.791 0.922 1.000 Base Case + TCVSC +

TBVOOS (all 5 valves) 0.608 0.608 0.703 0.761 0.822 1.000

+ RPTOOS + PROOS with TCVIS LaSalle Unit 2 Cycle 18 Page 15 of 21

COLR LaSalle 2 Revision 16 Table 6-3 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 and GNF3 Fuel, BOC to EOC, Pressurization (Application Groups with 1 TCV/TSV Closed or OOS),

(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 6-4 Flow-Dependent LHGR Multipliers (LHGRFACF) for GNF2 and GNF3 Fuel, BOC to EOC, No Pressurization (Application Groups with TCV/TSV In-Service)

(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 LaSalle Unit 2 Cycle 18 Page 16 of 21

COLR LaSalle 2 Revision 16

7. 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 (Reference 3):

Table 7-1 Rod Block Monitor Setpoints Rod Block Monitor Upscale Trip Function Allowable Value Two Recirculation Loop 0.66 W d + 54.0%

Operation Single Recirculation Loop 0.66 W d + 48.7%

Operation W d - 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 rod withdrawal error (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 (W d) of 100%.

LaSalle Unit 2 Cycle 18 Page 17 of 21

COLR LaSalle 2 Revision 16

8. Traversing In-Core Probe System (Reference 12) 8.1. 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 (Reference 4):

The total number of failed and/or bypassed LPRMs does not exceed 25%. In addition, no more than 14 TIP channels can be OOS (failed or rejected).

Otherwise, with the TIP system inoperable, suspend use of the system for the above applicable calibration functions.

8.2. 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.

LaSalle Unit 2 Cycle 18 Page 18 of 21

COLR LaSalle 2 Revision 16

9. Stability Protection Setpoints Technical Specification Section 3.3.1.3 Table 9-1 OPRM PBDA Trip Setpoints (Reference 7)

Corresponding Maximum PBDA Trip Amplitude Setpoint (Sp)

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.

LaSalle Unit 2 Cycle 18 Page 19 of 21

COLR LaSalle 2 Revision 16

10. Modes of Operation The allowed modes of operation with combinations of equipment out-of-service are as described below (Reference 7).

Table 10-1 Allowed Modes of Operation and EOOS Combinations (Reference 7)

Equipment Out of Service Options (1) (2) (3) (4) (5) Short Names BASE_DLO_OPTB(A)

Base Case Base Case + SLO BASE_SLO_OPTB(A)

EOOS1_DLO_OPTB(A)

Base Case + TCVSC + RPTOOS + PROOS EOOS1_SLO_OPTB(A)

Base Case + TCVSC + RPTOOS + PROOS + SLO EOOS2_DLO_OPTB(A)

Base Case + TCVSC + TBVOOS (all 5 valves)

EOOS2_SLO_OPTB(A)

Base Case + TCVSC + TBVOOS (all 5 valves) + SLO Base Case + TCVSC + TBVOOS (all 5 valves) + RPTOOS +

EOOS3_DLO_OPTB(A)

PROOS Base Case + TCVSC + TBVOOS (all 5 valves) + RPTOOS + EOOS3_SLO_OPTB(A)

PROOS + SLO BASE_TCVIS_DLO_OPTB(A)

Base Case with TCVIS BASE_TCVIS_SLO_OPTB(A)

Base Case + SLO with TCVIS Base Case + TCVSC + TBVOOS (all 5 valves) + RPTOOS + EOOS3_TCVIS_DLO_OPTB(A)

PROOS with TCVIS Base Case + TCVSC + TBVOOS (all 5 valves) + RPTOOS +

EOOS3_TCVIS_SLO_OPTB(A)

PROOS + SLO with TCVIS (1) Base case includes 1 SRVOOS + 1 TCV/TSV OOS + FWHOOS/FFWTR + 1 MSIVOOS + 2 TBVOOS + PLUOOS, and also includes 1 TIPOOS (up to 14 TIP channels not available) any time during the cycle, including BOC, and up to 25% of the LPRMs out-of-service (failed or rejected) (Reference 4). The one TCV and/or TSV OOS conditions require power level 85% of rated. The one MSIVOOS condition is also supported as long as thermal power is maintained 75% of the rated (Reference 7). The FWHOOS/FFWTR analyses cover a maximum reduction of 100qF for the feedwater temperature.

(2) TBVOOS (all 5 valves) is the turbine bypass system out of service which means that 5 TBVs are not credited for fast opening and 3 TBVs are not credited to open in pressure control. For the 2 TBVOOS condition that is a part of the base case, the assumption is that both TBVs do not open on any signal and thus remain shut for the transients analyzed (i.e. 3 TBVs are credited to open in pressure control). (Reference 9). 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.

(3) The + sign that is used in the Equipment Out of Service Option / Application Group descriptions designates an and/or.

(4) All EOOS Options (Reference 7 Application Groups) are applicable to ELLLA, MELLLA, ICF and Coastdown realms of operation with the exception that SLO is not applicable to MELLLA or ICF. The MOC to EOC exposure range limit sets are generated by GNF to include application to coastdown operation. Coastdown operation down to 40% reactor power is supported. During coastdown, operation at a power level above that which can be achieved (at all-rods-out with all cycle extensions features utilized, e.g., ICF, FFWTR) with steady-state equilibrium xenon concentrations is not supported. (Methodology Reference 1 and Reference 7).

(5) All EOOS options in Table 10-1 can be used in Option A or B.

LaSalle Unit 2 Cycle 18 Page 20 of 21

COLR LaSalle 2 Revision 16

11. 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-26 (Revision 26), General Electric Standard Application for Reactor Fuel, January 2018 and the U.S. Supplement NEDE-24011-P-A-26-US, January 2018.

LaSalle Unit 2 Cycle 18 Page 21 of 21