ML25106A310

Core Operating Limits Report Reload 28 Cycle 27

ML25106A310
Person / Time
Site:	Nine Mile Point
Issue date:	04/16/2025
From:	James Kim, Mcclure K Constellation Energy Generation
To:	Office of Nuclear Reactor Regulation
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ML25106A309	List: ML25106A310 NMP1L3537, Submittal of Core Operating Limits Report
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NMP1L3537
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Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 1 of 15 CORE OPERATING LIMITS REPORT FOR NINE MILE POINT NUCLEAR STATION UNIT 1 RELOAD 28 CYCLE 27 Prepared By:

A. Kim / K. McClure NF Cycle Management Reviewed By:

R. Olszewski NF Cycle Management Reviewed By:

J. Marchant-Daisley Reactor Engineering Reviewer Reviewed By:

T. Norman Engineering Safety Analysis Reviewer Approved By:

K. McCoskey Senior Manager - NF Cycle Management Station Qualified Review By:

E. Kelsey SQR Reviewer Kim, Andrew Jin Digitally signed by Kim, Andrew Jin Date: 2025.03.21 11:51:38

-04'00' 2025.03.24 10:46:25 -04'00' Olszewski, Ryszard Digitally signed by Olszewski, Ryszard Date: 2025.03.24 11:09:56 -04'00' Marchant-Daisley, John Digitally signed by Marchant-Daisley, John Date: 2025.03.24 13:05:01 -04'00' Digitally signed by Norman, Timothy Date: 2025.03.24 13:50:36 -05'00' Digitally signed by McCoskey, Kristin Date: 2025.03.24 20:30:25 -05'00' Digitally signed by Kelsey, Eric A Date: 2025.03.24 23:21:48 -04'00'

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 2 of 15 Table of Contents Section Title Page 1.0 Terms and Definitions 5

2.0 General Information 6

3.0 MAPLHGR Limits 7

4.0 MCPR Limits 8

5.0 LHGR Limits 11 6.0 Limiting Power / Flow Line 12 7.0 Modes of Operation 13 8.0 Methodology 14 9.0 References 15

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 3 of 15 Record of COLR Nine Mile Point 1 Cycle 27 Revisions Revision Description Rev. Number - 8 Initial Issuance for Cycle 27

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 4 of 15 List of Tables Page Table 3-1 MAPLHGR Versus Average Planar Exposure - GNF2 7

Table 3-2 MAPLHGR Multiplier for Three Recirculation Loop Operation 7

Table 4-1 Operating Limit Minimum Critical Power Ratio (OLMCPR) 9 Table 4-2 MCPR Adder for Three Recirculation Loop Operation 9

Table 4-3 Power Dependent MCPR Limits and Multipliers, MCPRP and KP 10 Table 4-4 Flow Dependent Operating Limit MCPR Multiplier, KF 10 Table 4-5 Safety Limit Minimum Critical Power Ratio (SLMCPR) 10 Table 5-1 Linear Heat Generation Rate Limits - UO2 Rods 11 Table 5-2 Linear Heat Generation Rate Limits - Gadolinia Rods 11 Table 5-3 Power Dependent LHGR Multiplier LHGRFACP for PROOS 11 Table 7-1 Modes of Operation 13 List of Figures Figure 6-1 Limiting Power/Flow Line 12

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 5 of 15 1.0 Terms and Definitions App. Condition 1 Application (App) Condition 1 is defined as operation with the TDFWP in service OR one MDFWP in service.

App. Condition 2 Application (App) Condition 2 is defined as operation with the TDFWP in service AND one MDFWP in service. This bounds TDFWP in service OR one MDFWP in service OR two MDFWPs in service.

App. Condition 3 Application (App) Condition 3 is defined as operation with the TDFWP in service AND two MDFWPs in service.

APRM Average Power Range Monitor ARTS APRM, Rod Block Monitor, and Technical Specification Improvement Program ELLLA Extended Load Line Limit Analysis EOOS Equipment Out of Service EOR End of Rated. The cycle exposure at which reactor power is equal to rated thermal power with recirculation system flow equal to 100%, all control rods fully withdrawn, all feedwater heating in service and equilibrium Xenon.

KF Off-rated flow dependent OLMCPR multiplier KP Off-rated power dependent OLMCPR multiplier LHGR Linear Heat Generation Rate LHGRFACF Off-rated LHGR flow dependent thermal limit multiplier LHGRFACP Off-rated LHGR power dependent thermal limit multiplier MAPFACF Off-rated flow dependent MAPLHGR multiplier MAPFACP Off-rated power dependent MAPLHGR multiplier MAPLHGR Maximum Average Planar Linear Heat Generation Rate MCPR Minimum Critical Power Ratio MCPRP Off-rated power dependent OLMCPR MDFWP Motor Driven Feedwater Pump OLMCPR Operating Limit Minimum Critical Power Ratio PROOS Pressure Regulator Out of Service RTP Rated Thermal Power SLMCPR Safety Limit Minimum Critical Power Ratio TDFWP Turbine Driven Feedwater Pump

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 6 of 15 2.0 General Information This report provides the following cycle-specific parameter limits for Nine Mile Point Nuclear Station Unit 1 Cycle 27:

Maximum Average Planar Linear Heat Generation Rate (MAPLHGR)

MAPLHGR three recirculation loop operation multiplier Safety Limit Minimum Critical Power Ratio (SLMCPR)

Operating Limit Minimum Critical Power Ratio (OLMCPR)

Three recirculation loop operation MCPR adjustment MCPR thermal limit adjustments and multipliers (MCPRP, KP, KF)

Linear Heat Generation Rate (LHGR)

LHGR thermal limit multipliers (LHGRFACP)

Limiting Power / Flow Line This report is prepared in accordance with Technical Specification 6.6.5 of Reference 1 Appendix A.

Power and flow dependent limits are listed for various power and flow levels. Linear interpolation is to be used to find intermediate values unless otherwise specified. Nine Mile Point Unit 1 is a non-ARTS plant that utilizes ELLLA operating domain.

The data presented in this report is valid for all licensed operating domains on the operating map, including:

Extended Load Line Limit down to the minimum licensed core flow (i.e., 85% of rated) during full power operation, Rated core flow of 67.5 Mlb/hr, Each mode supports operation with up to 10°F reduction in feedwater temperature.

Further information on the cycle-specific analyses for Nine Mile Point Unit 1 Cycle 27 and the associated operating domains discussed above is available in Reference 2.

Note that GNF and Nine Mile Point Unit 1 have different cycle numbering schemes. Cycle 27 is referred to as Cycle 29 in all GNF documentation.

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 7 of 15 3.0 MAPLHGR Limits 3.1 Technical Specification 3.1.7.a, 3.1.7.e, 6.6.5.a.1 3.2 Description The MAPLHGR limits for all bundle types as a function of average planar exposure is given in Table 3-1. For reduced loop operation, a fuel type dependent multiplier is used, which is shown in Table 3-2. For operation with three recirculation loops in service, multiply the values shown in Table 3-1 by the GNF2 value in Table 3-2. No additional multiplier is required for operation with four recirculation loops in service.

The MAPLHGR limits in Table 3-1 provide adequate protection for off-rated conditions; therefore, MAPFACP and MAPFACF are equal to 1.0 for all power and flow conditions (Reference 6 - Section 2). LHGRFACP and LHGRFACF are addressed in Section 5.0.

Table 3-1 MAPLHGR Versus Average Planar Exposure - GNF21:

(Reference 2 - Section 16.3)

Average Planar Exposure (GWD/ST)

MAPLHGR Limit1 (kW/ft) 0.00 9.85 13.61 9.85 16.33 9.50 25.40 9.50 29.94 9.00 41.10 9.00 57.15 6.96 Table 3-2 MAPLHGR Multiplier for Three Recirculation Loop Operation (Reference 2 - Section 16.3)

Fuel Type Three Loop Operation Multiplier GNF2 1.00 1 MAPLHGR limits are fuel lattice independent.

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 8 of 15 4.0 MCPR Limits 4.1 Technical Specification 3.1.7.c, 3.1.7.e, 6.6.5.a.2, 6.6.5.a.3 4.2 Description The OLMCPR is determined for a given power and flow condition by evaluating the power dependent MCPR and the flow dependent MCPR and selecting the greater of the two. Tables 4-1 and 4-2 originate in Reference 2 and are valid for all operating domains.

The current cycle has two mid-cycle MCPR breakpoints, as defined in Table 4-1. Note that PROOS has no effect on the base OLMCPRs in Table 4-1; however, there are PROOS Kp multipliers in Table 4-3.

For three loop recirculation, the adder presented in Table 4-2 must be applied to all limits in Table 4-1 and MCPRP in Table 4-3.

The power dependent MCPR limits are presented in Table 4-3 and are valid for all GNF2 bundles. Equal to or below 45% rated thermal power, the MCPRP limits in Table 4-3 are applied directly, with the adder from Table 4-2 as required; above 45% power, the KP multiplier is applied to the OLMCPR from Table 4-1 (and as affected by Table 4-2). The appropriate MCPRP or KP value may be determined by linear interpolation for statepoints not explicitly listed.

The flow adjusted OLMCPR is determined by multiplying the applicable rated condition OLMCPR provided by Table 4-1 (and as affected by Table 4-2) by the applicable KF multiplier given in Table 4-4. The appropriate KF value may be determined by linear interpolation.

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 9 of 15 Table 4-1 Operating Limit Minimum Critical Power Ratio (OLMCPR)

(Four/Five Recirculation Loop Operation)

(Reference 2 - Section 11)

EOOS Combination2,3 SCRAM Time Option4 Cycle Exposure

< 6000 MWd/ST 6000 MWd/ST and < EOR -

2236 MWd/ST EOR - 2236 MWd/ST App. Condition 1 B

1.46 1.47 1.53 A

1.56 1.57 1.63 App. Condition 2 B

1.48 1.49 1.55 A

1.58 1.59 1.65 App. Condition 3 B

1.50 1.51 1.57 A

1.60 1.61 1.67 Table 4-2 MCPR Adder for Three Recirculation Loop Operation (Reference 2 - Footnote 10)

Three Recirculation Loop Operation Adder 0.02 2 The OLMCPR values are independent of pressure regulator in-service or out-of-service conditions.

3 The OLMCPR values are based on the safety limit minimum critical power ratio (SLMCPR) values in Table 4-5.

4 For tau () 0, use SCRAM Time Option B limits. For () 1, use SCRAM Time Option A limits. When tau is between 0 and 1, use linear interpolation in accordance with site procedure to calculate OLMCPR (Reference 3).

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 10 of 15 Table 4-3 Power Dependent MCPR Limits and Multipliers, MCPRP and KP (Reference 2 - Appendix D)

EOOS Combination Core Flow

(% of rated)

Core Thermal Power (% of Rated) 25 45

> 45 65 85

> 85 100 Operating Limit MCPR, MCPRP Operating Limit MCPR Multiplier, Kp App. Condition 1

< 60 3.24 2.24 1.349 1.216 1.133 1.133 1.000 60 3.29 2.74 App. Condition 2

< 60 3.24 2.24 1.349 1.216 1.133 1.133 1.000 60 3.29 2.74 App. Condition 3

< 60 3.24 2.24 1.349 1.216 1.133 1.133 1.000 60 3.29 2.74 PROOS5

< 60 3.24 2.24 1.553 1.336 1.198 1.133 1.000 60 3.29 2.74 Table 4-4 Flow Dependent Operating Limit MCPR Multiplier, KF (Reference 2 - Appendix D)

Flow

(% rated)

MCPR Multiplier, KF6 0.0 1.500 45.0 1.500

> 45.0 1.132 75.0 1.000 102.5 1.000 Table 4-5 Safety Limit Minimum Critical Power Ratio (SLMCPR)

(Reference 2 - Section 11)

Exposure Range Four or Five Loop Value Three Loop Value

< 6000 MWd/ST 1.09 1.11 6000 MWd/ST 1.10 1.12 5 Limits apply to PROOS coincident with any Application Condition.

6 Values are applicable up to a Maximum Runout Flow of 102.5% of rated. Values apply to operation in all Application Conditions with or without Pressure Regulator in-service.

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 11 of 15 5.0 LHGR Limits 5.1 Technical Specification 3.1.7.b, 6.6.5.a.4 5.2 Description The Linear Heat Generation Rate for all fuel bundles shall not exceed the LHGR limits presented in Tables 5-1 and 5-2. Linear interpolation should be used as directed in Appendix B of Reference 4. Power adjusted LHGR limits are required for operation with PROOS at greater than or equal to 45% RTP. Below 45% RTP, no additional limits are required. These power dependent LHGR multipliers (LHGRFACP) are provided in Table 5-3 for Option B and Option A scram times (Reference 2). The power adjusted LHGR is determined by multiplying the applicable LHGR limit by the LHGR multiplier, LHGRFACP.

The LHGRFACP curves are independent of recirculation loop operability. The appropriate LHGRFACP values may be determined by linear interpolation. Flow dependent LHGR multipliers (LHGRFACF) are not required (Reference 2).

Table 5-1 Linear Heat Generation Rate Limits - UO2 Rods (Reference 4 and 7)

Fuel Type LHGR GNF2 See Table B-3 of Reference 4 Table 5-2 Linear Heat Generation Rate Limits - Gadolinia Rods (Reference 4 and 7)

Fuel Type LHGR GNF2 See Table B-4 of Reference 4 Table 5-3 Power Dependent LHGR Multiplier LHGRFACP for PROOS (Reference 2 - Appendix D)

Scram Time Option Core Thermal Power (% of rated)

< 45 45 65 85 100 Option A (i.e. > 0) 1.000 0.518 0.518 0.636 1.000 Option B 1.000 0.737 0.867 0.987 1.000

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 12 of 15 6.0 Limiting Power/Flow Line 6.1 Technical Specification 3.1.7.d, 3.1.7.e, 6.6.5.a.5 6.2 Description The Nine Mile Point Unit 1 limiting power/flow relationship is shown in Figure 6-1.

Figure 6-1 Limiting Power/Flow Line (References 5 and 8) 0 20 40 60 80 100 120 0

20 40 60 80 100 120 Core Thermal Power (% of Rated)

Core Flow = W (% of Rated)

(85, 100) (100, 100)

Power = 0.55*W + 53

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 13 of 15 7.0 Modes of Operation The allowable modes of operation are found in Table 7-1. Operation up to 67.5 Mlb/hr core flow is licensed for this cycle (Reference 2). The minimum coastdown thermal power level is 40% per T.S. 3.1.7.h (Reference 1).

All EOOS options allow for operation in either Option A or Option B.

Each mode supports operation with up to 10°F reduction in feedwater temperature.

Each mode may be coincident with coastdown operation.

Table 7-1 Modes of Operation (Reference 2)

Options Allowed Operating Region Four/Five-loop Operation, App. Condition 1 Yes Four/Five-loop Operation, App. Condition 2 Yes Four/Five-loop Operation, App. Condition 3 Yes PROOS, Four/Five-loop Operation, App. Condition 1 Yes PROOS, Four/Five-loop Operation, App. Condition 2 Yes PROOS, Four/Five-loop Operation, App. Condition 3 Yes Three-loop Operation, App. Condition 1 Yes7 Three-loop Operation, App. Condition 2 Yes7 Three-loop Operation, App. Condition 3 Yes7 PROOS, Three-loop Operation, App. Condition 1 Yes7 PROOS, Three-loop Operation, App. Condition 2 Yes7 PROOS, Three-loop Operation, App. Condition 3 Yes7 7 Per Ref. 1 Appendix A - TS 3.1.7.e, power is restricted to 90% of rated during three-loop operation.

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 14 of 15 8.0 Methodology 8.1 Technical Specification 6.6.5.b.1 8.2 Description 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, Global Nuclear Fuel Document No. NEDE-24011-P-A-31, November 2020 and U.S. Supplement NEDE-24011-P-A US, November 2020.8 8 NEDE-24011-P-A-32-US is the latest revision, but the methodology used in Reference 2 is based on NEDE-24011-P-A-31-US, and there is no impact to the NM1C27 Reload by the revision.

Constellation Energy Generation - Nuclear Fuels Doc ID: COLR Nine Mile Point 1, Rev. 8 Core Operating Limits Report for Nine Mile Point 1 Cycle 27 Page 15 of 15 9.0 References

1. Nine Mile Point Nuclear Station, Unit 1 Renewed Facility Operating License, Docket No. 50-220, License No. DPR-63.

2. Supplemental Reload Licensing Report for Nine Mile Point Unit 1 Reload 28 Cycle 29, Global Nuclear Fuel Document No. 007N9209, Rev. 0, February 2025.

3. Engineering Report for Nine Mile Point Nuclear Station Unit 1 Reload 19, Global Nuclear Fuel Document No. 0000-0053-5247-ER, Rev. 1, March 2007.9

4. GNF2 Advantage Generic Compliance with NEDE-24011-P-A (GESTAR II), Global Nuclear Fuel Document No. NEDC-33270P, Rev. 11, August 2020.

5. Limiting Relationship Between Core Power and Core Flow Rate (TAC 63532), NRC Letter, Nine Mile Point 1 Technical Specification Amendment 92 to Facility Operating License No. DPR-63, March 24, 1987 (NRC Accession Number ML010990453).

6. Nine Mile Point Nuclear Station Unit 1 TRACG-LOCA Loss-of-Coolant Accident Analysis for GNF2 Fuel, GEH Nuclear Energy Document No. 002N3714, Rev. 0, March 2017.

7. Fuel Bundle Information Report for Nine Mile Point Unit 1 Reload 28 Cycle 29, Global Nuclear Fuel Document No. 007N9210, Rev. 0, November 2024.

8. Nine Mile Point 1 Cycle 24 Limiting Load Line Analysis, Global Nuclear Fuel Document No.

002N5662-R0, March 18, 2015.

9 The information referenced from this report (see COLR Section 4.2 footnote 4) is cycle independent.