ML24018A022

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Core Operating Limits Report (COLR) Cycle 24, Revision 2
ML24018A022
Person / Time
Site: Grand Gulf Entergy icon.png
Issue date: 01/18/2024
From: Hardy J
Entergy Operations
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
GGNS TS 5.6.5, GNRO2024-00003
Download: ML24018A022 (1)
v • d • e


Text

Entergy Operations, Inc.

entergy P.O. Box 756 Port Gibson, Mississippi 39150

Jeffery Hardy Manager Regulatory Assurance Grand Gulf Nuclear Station Tel: 802-380-5124

GGNS TS 5.6.5 GNRO2024-00003

January 18, 2024

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555-0001

SUBJECT:

Grand Gulf Nuclear Station (GGNS) Core Operating Limits Report (COLR) Cycle 24, Revision 2

Grand Gulf Nuclear Station, Unit 1 Docket No. 50-416 License No. NPF-29

In accordance with 10 CFR 50.36 and GGNS Technical Specification Section 5.6.5.d, GGNS is required to provide to the Nuclear Regulatory Commission any updates to the COLR.

Revision 2 of the GGNS Cycle 24 COLR is attached to this letter.

There are no commitments contained in this submittal. If you have any questions or need additional information, please contact me at 802-380-5124.

Si ~ Al :t~

JH/ram t:r/ ;

Attachment:

Core Operating Limits Report (COLR) Cycle 24, Revision 2 G NRO2024-00003 Page 2 of 2

cc: NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150

U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Grand Gulf Nuclear Station Core Operating Limits Report

Cycle 24

Revision 2 CORE OPERATING LIMITS REPORT

REASON FOR. REVISION

The Cycle 24 core operating limits are updated to provide cycle-specific MCPR and Revision 0:

LHGRFAC multiplier values, independent of fuel type. Figure 1-1 and 1-2 provides the APLHGR limits for the GNF2 and GNF3 fuel types, respectively. Figures 2-1 through 2-5 are updated with new MCPR limits and Figures 3-1 through 3-4 are updated with new LHGRFAC limits. No other core operating limits are changed.

These limits are based on a core power of 4408 MWt.

Revision 1:

The Cycle 24 core operating limit reports is updated due to the F024-02 core shuffle to replace two failed fuel bundles. This revision is to update the GESTAR analysis reference which concludes that the Cycle 24 SRLR is still applicable to the core. There are no changes to the Cycle 24 limits in this revision.

The Cycle 24 core operating limits report is updated due to re-analyzed pressure Revision 2:

regulator out of service power-dependent MCPR limits, and to implement updated power-dependent MCPR penalties issued with SC21-04 Rev. 2 to all application conditions. The SRLR and TRACG-AOO engineering reports revision numbers are updated.

COLR Page 2 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

TABLE OF CONTENTS

1.0 PURPOSE 4 2.0 SCOPE 4

3.0 REFERENCES

5 3.1 Current Cycle References 5 4.0 DEFINITIONS 7 5.0 GENERAL REQUIREMENTS 9 5.1 Average Planar Linear Heat Generation Rates 9 5.2 Minimum Critical Power Ratio 9 5.3 Linear Heat Generation Rate 10 5.4 Stability 10 5.5 Applicability 11 5.6 Limitations and Conditions 11

Table 1 OPRM Upscale CDA Amplitude Discriminator 12 Setpoint

Table 2 BSP Endpoints for Normal Feedwater Temperature 12 Table 3 BSP Endpoints for Reduced Feedwater 12 Temoerature

Table 4 ABSP Setpoints for the Scram Region 12 Table 5 Margin to Thermal Overpower and Mechanical 12 Overpower Limits

Table 6 Application Conditions 13 Table 7 Rated OLMCPR Summary Table 13 Figure(s) 1 APLHGR Operating Limits 14 Figure(s) 2 MCPR Operating Limits 15 Figure(s) 3 LHGR Operating Limits 20 Figure 4 Backup Stability Protection Region Boundaries 22 for Normal Feedwater Temperature

Figure 5 Backup Stability Protection Region Boundaries 23 for Reduced Feedwater Temperature

Figure 6 MCPRP Limit and K(P) Multiplier for EIS, FWH 24 Figure 7 MCPRP Limit and K(P) Multiplier for PR OOS, PR 25 OOS, EOC-RPT OOS, FHW & EOC-RPT OOS

& EOC-RPT OOS Figure 8 MCPRP Limit and K(P) Multiplier for PR & FWH 26 OOS, PR & FHW & EOC-RPT OOS

COLR Page 3 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

1.0 PURPOSE The COLR is controlled as a License Basis Document and revised accordingly for each fuel cycle or remaining portion of a fuel cycle. Any revisions to the COLR must be submitted to the NRC for information as required by Tech Spec 5.6.5 and tracked by Licensing Commitment 29132. This COLR reports the Cycle 24 core operating limits and stability setpoint confirmation and regions.

2.0 SCOPE As defined in Technical Specification 1.1, the COLR is the GGNS document that provides the core operating limits for the current fuel cycle. This document is prepared in accordance with Technical Specification 5.6.5 for each reload cycle using NRC-approved analytical methods.

The Cycle 24 core operating and stability limits included in this report are:

  • the Average Planar Linear Heat Generation Rate (APLHGR),
  • the Linear Heat Generation Rate (LHGR) limit, and
  • the DSS-CD stability setpoint confirmation and regions.

COLR Page 4 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

3.0 REFERENCES

This section contains the cycle-specific references used in the safety analysis of Grand Gulf Cycle 24.

Methodology references are documented in Technical Specification 5.6.Sb.

3.1 Current Cycle References

3.1.1 ECH-NE-22-00002 Revision 1, Supplemental Reload Licensing Report for Grand Gulf-1 Reload 23 Cycle 24, December 2023.

3.1.2 ECH-NE-10-00021 Revision 5, GNF2 Fuel Design Cycle-Independent Analyses for Entergy Grand Gulf Nuclear Station, February 2020.

3.1.3 ECH-NE-22-00001 Revision 0, Fuel Bundle Information Report for Grand Gulf-1 Reload 23 Cycle 24, November 2019.

3.1.4 NEDC-32910P, Revision 1, Grand Gulf Nuclear Station SAFER/GESTR-LOCA Accident Analysis With Relaxed ECCS Parameters, October 1999 (GEXI-1999-00174).

3.1.5 GGNS-NE-12-00022 Revision 0, Grand Gulf Nuclear Station MELLLA+ Task T0407, ECCS-LOCA Performance, September 2012.

3.1.6 GGNS-SA-09-00002 Revision 1, Grand Gulf Nuclear Station GNF2 ECCS-LOCA Evaluation, December 2009.

3.1.7 NEDC-33173P-A, Revision 5, Applicability of GE Methods to Expanded Operating Domains (with Supplements SP-A Rev. 1, and 6P-A Rev. 1), October 2019.

3.1.8 NEDC-33006P-A, Revision 3, GE BWR Maximum Extended Load Line Limit Analysis Plus, June 2009.

3.1.9 ECH-NE-22-00010, Revision 1, GGNS Cycle 24 GESTAR Assessment, July 2022.

3.1.10 ECH-NE-20-00006 Revision 0, GNF3 Fuel Design Cycle-Independent Analyses for Grand Gulf Nuclear Station, February 2020.

3.1.11 GGNS-SA-19-00001 Evaluation Revision 1, October 2019. Revision O Grand Gulf Nuclear Station GNF3 ECCS-LOCA

3.1.12 GEH-GGNS-AEP-632, GGNS MELLLA+ Final DSS-CD Settings Report, October 23, 2013.

3.1.13 NEDE-24011-P-A-31, General Electric Standard Application for Reactor Fuel (GESTAR-II), November 2020, (KGO-ENO-GEN-21-039).

3.1.14 ECH-NE-21-00025 Rev. 1, Grand Gulf Nuclear Station TRACG Implementation for Reload Transient Analysis (T1309), December 2023.

3.1.15 NED0-33612-A, Revision 0, Safety Analysis Report for GGNS Maximum Extended Load Line Limit Analysis Plus, September 2013.

COLR Page 5 LBDCR 2023 - 0056 CORE OPERATING LIMITS REPORT

3.1.16 NEDC-33292P, Revision 3, GEXL17 Correlation for GNF2 Fuel, June 2009 (RAENO-GEN-10-034).

3.1.17 NEDC-33880P, Revision 1, GEXL21 Correlation for GNF3 Fuel, November 2017 (KGO-ENO-GEN-20-031).

3.1.18 NEDC-33840P-A, Revision 1, The PRIME Model for Transient Analysis of Fuel Rod Thermal - Mechanical Performance, August 2017.

3.1.19 GGNS-NE-10-00076, Revision O (GEH 0000-0121-1122-RO), GGNS EPU Option B Scram Times, September 2010.

3.1.20 NEDC-33270P, Revision 9, GNF2 Advantage Generic Compliance with NEDE-24011-P-A (GESTAR II), Dec 2017. (KGO-ENO-JBl-18-068).

3.1.21 NEDC-33879P, Revision 4, GNF3 Generic Compliance with NEDE-24011-P-A (GESTAR II), August 2020.

3.1.22 GGNS-SA-21-00002, Revision O (GEH 0000-0158-7807-Rl), Grand Gulf Nuclear Station PRNM System DSS-CD Settings, April 2020

3.1.23 SC 21-04 Revision 2, Fuel Support Side Entry Orifice Meta-Stable Flow for 2 Beam Locations in the BWR/6 Reactors, July 2023.

3.1.24 GNF006N2281 Revision 0, Nuclear Design Report for Grand Gulf Nuclear Station Cycle 24, August 2021.

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4.0 DEFINITIONS

4.1 Average Planar Linear Heat Generation Rate (APLHGR) - the APLHGR shall be applicable to a specific planar height and is equal to the sum of the linear heat generation rates for all the fuel rods in the specified bundle at the specified height divided by the number of fuel rods in the fuel bundle at 4.2 Average Planar Exposure - the Average Planar Exposure shall be applicable to the specified height.

a specific planar height and is equal to the sum of the exposure of all the fuel rods in the specified bundle at the specified height divided by the 4.3 Critical Power Ratio (CPR) - the ratio of that power in the assembly, which number of fuel rods in the fuel bundle at the specified height.

is calculated by application of the fuel vendor's appropriate boiling correlation, to cause some point in the assembly to experience boiling transition, divided by the actual assembly operating power.

4.4 Core Operating Limits Report (COLR) - The Grand Gulf Nuclear Station specific document that provides core operating limits for the current reload cycle in accordance with Technical Specification 5.6.5.

4.5 Linear Heat Generation Rate (LHGR) - the LHGR shall be the heat generation per unit length of fuel rod. It is the integral of the heat flux over the heat transfer area associated with the unit length.

4.6 Minimum Critical Power Ratio (MCPR) - the MCPR shall be the smallest CPR which exists in the core.

4.7 MCPR Safety Limit - cycle specific SLMCPR, known as MCPR ~.~, is the minimum value of the CPR at which the fuel could be operated to ensure that 99.9% percent of the fuel in the core is not susceptible to the boiling 4.8 Oscillation Power Range Monitor (OPRM) - Provides automatic detection and transition.

suppression of reactor core thermal-hydraulic instabilities through 4.9 Backup Stability Protection (BSP) Boundary - Defines the operation domain monitoring neutron flux changes.

where potential instability events can be effectively addressed by specific operator action. Region of the power and flow operating domain that is not expected to be susceptible to instability events associated with a high 4.10 Backup Stability Protection (BSP) Scram Region - The area of the core power initial growth rate.

and flow operating domain where the reactor is susceptible to reactor instabilities under conditions exceeding the licensing basis of the current reactor system. An immediate manual scram is required upon entry.

4.11 Backup Stability Protection (BSP) Controlled Entry Region - The area of the core power and flow operating domain where the reactor is susceptible to reactor instabilities. Compliance with at least one alternate stability control is required upon entry.

4.12 Automated Backup Stability Protection (ABSP) Scram Region - An automated reactor scram region that bounds the BSP Scram Region and is initiated by 4.13 End of Rated (EOR) - The Cycle exposure corresponding to all rods out, 100% the APRM flow-biased scram setpoint upon entry.

4.14 Middle of Cycle (MOC) - The Cycle 24 MOC Core Average Exposure (CAE) is power, 100% flow, and normal feedwater temperature [3.1.1].

4.15 End of Cycle (EOC) - The Cycle 24 EOC CAE is 32,487 MWd/ST [3.1.24]. MOC= EOR-3,996 MWd/ST [3.1.1].

4.16 Maximum Extended Load Line Limit Analysis Plus (MELLLA+) - The GGNS MELLLA+ operating domain is depicted in Figure 4.

4.17 Maximum Number of OPRM Cells Along an Instability Symmetry Axis (MAx) - An OPRM configuration constant representing maximum number of OPRM cells along an instability symmetry axis. It is used to calculate the number of

COLR Page 7 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

unresponsive OPRM cells. Per [3.1.12] the GGNS specific value is five 4.18 Application Conditions - The combination of equipment out of service CM~= 5).

conditions for which LHGRFAC and MCPR limits are determined [3.1.1]. The Application Conditions are specified in Table 6.

4.19 MCPRgs/95 Safety Limit - Cycle-independent Technical Specification (TS) 2.1.1 SLMCPR, ensures there is a 95 percent probability at a 95 percent confidence level that no fuel rods will be susceptible to transition boiling.

COLR Page 8 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

5.0 GENERAL REQUIREMENTS

5.1 Average Planar Linear Heat Generation Rates Consistent with Technical Specification 3.2.1, all APLHGRs shall not exceed the fuel type and exposure-dependent limits reported in Figures 1-1 and 1-2 [3.1.1].

5.2 Minimum Critical Power Ratio Operation (TLO), and 1.12 for Single Loop Operation (SLO) [3.1.1]. For Cycle 24, the cycl e-speci fi c MCPR Safety Limit (MCPR99.9%), is 1.12 for Two Loop

GEH Safety Communication 21-04 [3.1.23] identifies a metastable flow condition that may exist in a BWR/6 in core locations fed by a side entry orifice adjacent to two core support cross beams. The vendor has been unable to determine the frequency of occurrence of this flow condition, if any. This flow condition results in a higher loss coefficient and lower CPR (applied as higher MCPR limits). To be conservative, it is assumed this condition always exists, so an MCPR penalty is always applied.

All power-dependent MCPR limits in the COLR Tables and Figures apply the penalty recommended by SC 21-04 Rev. 2 [3.1.23].

Consistent with Technical Specification 3.2.2, the MCPR shall be equal to or greater than the limits reported in Figure(s) 2 as functions of power, flow, exposure, and scram speed [3.1.1, 3.1.2, 3.1.10, 3.1.19]. For operation at powers

~35.4%, the power-dependent MCPR shall be determined based on scram time surveillance data as follows. [3.1.19]

1) If the average scram time (T;1vE:) satisfies the following:

'AVE~'B,

then the power dependent MCPR shall be equal to or greater than the Option B limits reported in Figure(s) 2 as a function of exposure.

2) If the average scram time

then the power-dependent MCPR shall be equal to or greater than the Tau 0.2 limits reported in Figure(s) 2 as a function of exposure,

3) If the average scram time

'A VE > Ts and r > 0.2,

then the power-dependent MCPR shall be equal to or greater than the Option A limits reported in Figure(s) 2 as a function of exposure.

In the above equations:

'..t vt = average scram time to the 20% insertion position as calculated by equation 1 of Reference 3.1.19,

COLR Page 9 LBDCR 2023 - 0056 CORE OPERATING LIMITS REPORT

T 8 = adjusted analysis mean scram time for 20% insertion as calculated by equation 3 of Reference 3.1.19 and

T = TAn :* -T B T ri -TB where

T A the technical specification limit on core average scram time to the 20 percent insertion position (0.503 seconds).

The limits determined above support operation with Turbine Bypass Valves Out of Service as described in Technical Specification 3.7.7. Additional MCPR operating limits are provided to support operation with EOC-RPT inoperable as described in Technical Specification 3.3.4.1.

Rated Operating Limit MCPR values (equipment in service, 100% power, OLMCPR's) are provided in Table 7. These can be used with the Kp factors in Figures 6 through 8 to determine the appropriate power-dependent OLMCPR at a certain power level. The MCPR graphs in Figures 2-1 through 2-4 include the SC 21-04 Rev. 2 [3.1.23]

penalties. The SC21-04 Rev. 2 penalty does not need to be applied to flow-dependent MCPR results.

When calculating SLO MCPR's, 0.03 should be added to TLO MCPR value. This has been incorporated into the SLO MCPR values in the "B" figures in Figures 2-1 through 2-5.

Note that all MCPR Figures (2-1 through 2-4) already apply the Kp factors and the SC 21-04 Rev. 2 penalties and should be used as the operating limit power-dependent MCPR.

At the time of Revision 2 implementation, the cycle is in the MOC-EOC life of Cycle 24. As such only MOC-EOC limits are displayed for the power-dependent MCPR in Figures 2-1 through 2-4.

5.3 Linear Heat Generation Rate Consistent with Technical Specification 3.2.3, the LHGRs for any GNF2 or GNF3 fuel rod at any axial location shall not exceed the nodal exposure-dependent limits reported in Reference 3.1.3 (by reference reported in [3.1.20] for GNF2 and [3.1.21] for GNF3) multiplied by the smaller of either the power-dependent or flow dependent LHGR factors reported in Figures 3-1 and 3-2, and Figures 3-3, respectively [3.1.1]. The limits determined above support operation with Turbine Bypass Valves Out of Service as described in Technical Specification 3.7.7.

5.4 Stability The OPRM Upscale Confirmation Density Algorithm (CDA) Amplitude Discriminator setpoint is reported in Table 1.

The Backup Stability Protection (BSP) regions boundaries are reported in Figures 4 and 5 [3.1.1]. BSP measures support operation with the OPRM upscale trip function inoperable as described in Technical Specification 3.3.1.1 Condition J. The endpoints for the BSP region boundaries are provided for normal (NFWT) and reduced (RFWT) feedwater temperature operations in Tables 2 and 3, respectively. Figures 4 and 5 COLR Page 10 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

depict the BSP region boundaries for NFWT and RFWT operations. Note that Figures 4 and 5 also depict the MELLLA+ and MELLLA domains, consistent with feedwater temperature operating limitations.

The ABSP APRM Simulated Thermal Power (STP) setpoints associated with the ABSP Scram Region are provided in Table 4. The ABSP setpoints are applicable to TLO and SLO, and to both normal and reduced feedwater temperature operations.

The BSP Boundary and Manual BSP region boundaries for normal feedwater temperature operations are valid for reductions in normal feedwater temperature as much as (and including) -10.0 °F [3.1.1].

5.5 Applicability The following core operating limits are applicable for operation in the Maximum Extended Operating Domain (MEOD), with Feedwater Heaters Out of Service (FWHOOS),

Turbine Bypass Out of Service (TBVOOS), EOC-RPT inoperable, and Pressure Regulator Out of Service (PROOS). For operation with one of the previous conditions mentioned, the alternate MCPR limits described in Section 5.2 above must be implemented. Table 6 provides an applicability condition list of events related to the Figures. For SLO, the following additional requirements must be satisfied.

1. THE APLHGRs shall not exceed the exposure-dependent limits determined in accordance with Section 5.1 [3.1.1].

2. THE LHGRs shall not exceed the smaller of the nodal exposure-dependent limits determined in accordance with Section 5.3 above or the nodal exposure-dependent limits reported in Reference 3.1.3.

3. The MCPR shall be equal to or greater than the limits determined in accordance with Section 5.2. SLO MCPR operating limits are displayed in Figures 2-1 through 2-5 "B" [3.1.1].

5.6 Limitations and Conditions As required by Limitation and Condition 9.10/9.ll of licensing topical report NEDC-33173P-A [3.1.7], the limiting Thermal and Mechanical Overpower results are reported in Table 5. The results are summarized as a percent margin to both of these limits. The results are confirmed to meet the required 10% margin to the design limits [3.1.1].

As required by Limitation and Condition 12.10.b of licensing topical report NEDC-33006P-A [3.1.8], the off-rated limits assumed in the ECCS-LOCA analyses are confirmed to be consistent with the off-rated LHGR multipliers provided Figures 3-1 through 3-3. These off-rated LHGR multipliers provide adequate protection for MELLLA+ operation.

As required by Limitation and Condition 12.5.c of licensing topical report NEDC-MELLLA+ operating domain is included as Figure 4. 33006P-A [3.1.8], the plant specific power/flow map specifying the GGNS licensed

As required by Limitation and Condition 12.5.b of licensing topical report NEDC-33006P-A [3.1.8], operation with Feedwater Heaters Out of Service (FWHOOS) is prohibited while in the MELLLA+ operating domain [3.1.1]. In addition, as required by Limitation and Condition 12.5.a of licensing topical report NEDC-33006P-A [3.1.8], and described in GGNS TS 3.4.1 LCO, SLO is prohibited in the MELLLA+

operating domain [3.1.1].Therefore, operations with RFWT and/or SLO must adhere to the operating domain shown in Figure 5.

COLR Page 11 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

Table 1 OPRM Upscale CDA Amplitude Discriminator Setpoint

Amplitude Discriminator Trip 1.10

BSP Endpoints for Normal Feedwater Temperature Table 2

Endpoint Power(%) Flow(%) Definition Al 72.3 44.2 Scram Region Boundary, HFCL Bl 34.2 25.2 Scram Region Boundary, NCL A2 67.3 50.0 Controlled Entry Region Boundary, HFCL B2 26.4 24.4 Controlled Entry Reqion Boundary, NCL

BSP Endpoints for Reduced Feedwater Temperature Table 3

Endpoint Al' Power(%) Flow(%) Definition Bl' 67.5 50.2 Scram Region Boundary, HFCL 28.2 24.5 Scram Region Boundary, NCL A2' 69.7 52.9 Controlled Entry Region Boundary, HFCL B2' 26.4 24.4 Controlled Entry Region Boundary, NCL

Table 4 ABSP Setpoints for the Scram Region

Parameter Symbol Value Slope of ABSP APRM fl ow-biased trip linear segment mTRIP 0.77 ABSP APRM flow-biased trip setpoint power intercept. PssP-TRIP 31.0% RTP1 Constant Power Line for Trip from zero Drive Flow to Flow Breakpoint.

ABSP APRM flow-biased trip setpoint drive flow WssP-TRIP 39.0% RDF2 intercept. Constant Flow Line for Trip.

Flow Breakpoint value WssP-BREAK 7. 5% RDF2

1. RTP - Rated Thermal Power 2. RDF - Recirculation Drive Flow

Margin to Thermal Overpower and Mechanical Overpower Limits Table 5

Criteria GNF3 Thermal Overpower Margin 30. 21%

Mechanical Overpower Margin 49. 54%

COLR Page 12 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

Application Conditions Table 6

Application FWH OOS EOC-RPT PR OOS TBV 00S Condition 1 X 2 X X 3 X X 4 X X X 5 X X 6 X X X 7 X X X 8 X X X X

Rated OLMCPR Summary Table Table 7

Application GNF3 OPT A GNF3 OPT B Condition MOC-EOC MOC-EOC 1 1. 38 1. 30 2 1. 38 1. 30 3 1. 39 1. 31 4 1. 39 1. 31 5 1.42 1.42 6 1.46 1.46 7 1.42 1.42 8 1.46 1.46

COLR Page 13 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

15 14 0.00, 13.78 17.52, 13.78

13 12 F11 i

~ 10

~

~ 9

..J IL i 8 7

6

5 4 +-..,__,.__,..__._-+__.___,_____,_.....,___-+-......__..,__......__.----+__.___.___,____._-+-_,__......__..,__'----lf---L--'-__.___,_-+-.....,____,__....__~

0 10 20 30 40 50 60 70 Average Planar Exposure (GWd/S1}

Figure 1-1 GNF2 Maximum Average Planar Linear Heat Generation Rate Note: Actual Limits described in Sections 5.1 and 5.5

15 0.00, 14.36 14 13 12 F 11 i ~ 10

~

C, 9

c..J IL i 8 7

6 5

4 0 10 20 30 40 50 60 70 Average Planar Exposure (GWd/S1}

Figure 1-2 GNF3 Maximum Average Planar Linear Heat Generation Rate Note: Actual Limits described in Sections 5.1 and 5.5

COLR Page 14 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

2.2 ::: 50% Core Flow

2. 1 21.8, 2.08 /

2.0 21.8, 1.97 1.9 Option A 1.8 < 50% Core Flow I a: 1.7 35.4, 1.69 I 10.,.s, Tau= 0.2 ci" 1.6 35.4, 1.62

a. 35 4, 1.60

~ 1.5 40, 1.62 50, 1.~5 /

1.4 40, 160 SO, 1 51/ 70, 1.46 100, 1.38 1.3 70, 1.43 70, 1.4-4 100, 1.32 Option B 70, 1.41 85, 1.41 100, 1.30 1.2 1.1 1.0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure 2-1A Cycle 24 Power-Dependent MCPR Limits, EIS or FWH 00S MOC to EOC, TLO

2.2 ~ 50% Core Flow 2.1 21.8, 2.11 I

2.0 21.8, 2.00

1.9 Option A 1.8 < 50% Core Flow /

35.4, 1.72 Tau= 0.2 a: 1.7 35.4, 1.65 / 70, 1.56 ci" 1.6 35.4, 1.63

a. u
E 1.5 4-0, 1.65

40, 1.63 100, 1.41 1.4 70, 1.46 70, 1.47 100, 1.35 1.3 70, 1.44 85, 1.4-4 100, 1.33

1.2 1.1 1.0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure2-1B Cycle 24 Power-Dependent MCPR Limits, EIS or FWH 00S MOC to EOC, SLO

COLR Page 15 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

2.2 ~ 50% Core Flow

2. 1 21.8, 2.08 /
2. 0 21.8, 1.97
1. 9 35.4, 1.90 1.8 < 50% Core Flow/ 40, 1.71 ci: 1.7 35.4, 1.71 70, 1.54 ci' 1.6 35.4, 1.63 Tau= 0.2 Q.

!I 1.5 35.4, 1.61 40, 1.63 1.4 40, 1 61 so, 1.56 / 100, 1.39 1.3 so, 1.54 70, 1.47 70, 1.44 100, 1.33 1.2 Option B 70, 1.45 85, 1.42 100, 1.31 70, 1.42

1. 1 1.0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure 2-2A Cycle 24 Power-Dependent MCPR Limits with EOC-RPT 00S, or EOC-RPT & FWH 00S MOC to EOC, n.o

2.2 ~ 50% Core Flow 2. 1 21.8, 2.11 /

2.0 21.8, 2.00 /

1.9 1.8 < 50% Core Flow 35.4, 1.74 ci: 1.7 35.4, 1.66 70, 1.57 ci' Tau= 0.2 Q. 1.6 35.4, 1 64 u

E 1. 5 40, 1.S.C 50, 159 / 100, 1.42 1.4 50, 1.57 70, 1.50 100, 1.36 1.3 70, 1.47 70, 1.48 100, 1.3-4 1.2 Option B 70, 1.45

1.1

1. 0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure 2-2B Cycle 24 Power-Dependent MCPR Limits with EOC-RPT 00S, or EOC-RPT & FWH 00S MOC to EOC, SLO

COLR Page 16 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

2.2 ~ 50% Core Flow

2. 1 2.0

1.9 50, 1.93 1.8

~ 1.7

~ 1.6 C.

u

& 1.5

1.4 100, 1.42 1.3

1.2 1.1 1.0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure 2-3A Cycle 24 Power-Dependent MCPR Limits with PR oos or PR & EOC RPT 00S MOC to EOC, TLO

2.2 ~ 50% Core Flow

2. 1 21.8, 2.11.---

2.0 21.8, 2.00 1.9 35.4, 1.96 50, 1.96 1.8 < 50% Core Flow /

~ 1.7 C. ~ 1.6 u

& 1.5

1.4 100, 1.45 1.3

1.2

1. 1 1.0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure 2-3B Cycle 24 Power-Dependent MCPR Limits with PR 00S or PR & EOC RPT 00S MOC to EOC, SLO

COLR Page 17 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

2.2 ~ 50% Core Flow 2.1 21.8, 2.08 70. 1.97 2.0 21.8, 1.98 / 35.4, 1.98 50, 1.98 1.9 1.8 < 50% Core Flow C: 1.7

~ 1.6 0.

u

E 1.5 1.4 100, 1.46

1.3 1.2

1. 1 1.0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure2-4A Cycle 24 Power-Dependent MCPR Umits with PR & FWH 00S or PR & FWH & EOC-RPT 00S MOC to EOC, n.o

2.2 ~ 50% Core Flow 2. 1 21.8, 2. 11 70, 2.00

2.0 21.8, 2.01 / 35.4, 2.01 50, 2.01 1.9 1.8 < 50% Core Flow C: 1.7

~ 1.6 0.

u

E 1.5 1.4 100, 1.49

1.3 1.2

1. 1 1.0 0 10 20 30 40 50 60 70 80 90 100 Core Power (% Rated)

Figure2-4B Cycle 24 Power-Dependent MCPR Umits with PR & FWH 00S or PR & FWH & EOC-RPT 00S MOC to EOC, SLO

COLR Page 18 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

2.00 1.95 1.90 1.85 1.80 1.75 1.70 1.65

£ 1.60 ft: 1.55 0

IE 1.50 1.45 1.40 1.35 90, 1.31 110, 1.31 1.30 1.25 81.5, 1.31 100, 1.31 1.20 1.10 _ _..._ __ __._ __........... ______.......__---1-_....__ ______________ - ___ __

1.15

0 10 20 30 40 50 60 70 80 90 100 110 Core Flow (% Rated)

Figure 2-5A Cycle 24 Flow-Dependent MCPR Limits, TLO, All Application Conditions

2.00 1.95 1.90 1.85 1.80 1.75 1.70 1.65

£ 1.60 ft: 1.55 0

IE 1.50 1.45 1.40 90, 1-34 110. 1.34 1.35 1.30 81.5, 1.34 100, 1.34 1.25 1.20 1.15 1.10 +----'--1--.......... ---if--......... --+-.......__-+_...__-+------+-----'-----t-__._-+-__.__+-__.___l--__._----i 0 10 20 30 40 50 60 70 80 90 100 110 Core Flow (% Rated)

Figure 2-5B Cycle 24 Flow-Dependent MCPR Limits, SLO, All Application Conditions

COLR Page 19 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

1.05 35.4, 1.000 50, 1.000 70, 1.000 85, 1.000 100, 1.000 1.00

0.95

0.90 35.4, 0.896

'ii: < 50% Core Flow u 0.85 Lf a:

(!) 0.80

i 0.75 21.8, 0.760

35.4, 0.730 0.70 ~ 50% Core Flow

0.65 21.8, 0.645

0.60 0 10 20 30 40 50 60 70 80 90 100 110 Power (% Rated)

Figure 3-1 Cycle 24 Power-Dependent LHGR Factor, EIS, FWH OOS, EOC-RPT OOS, EOC-RPT & FWH OOS Note: These factors to be applied to the exposure-dependent limits as descibed in Section 5.3

1.05 85. 1.000 100, 1.000 1.00

0.95 0.90 < 50% Core Flow

'ii: u 0.85 Lf ffi 0.80

c

.J 0.75 21.8, 0.760

~ 50% Core Flow 0.70

0.65 21.8, 0.645

0. 60 +-'-......_.._._+...a._,_,.....,__+-'-......_.......... -f--L......_.__._+-'-......_.__._-+-'......_..__._-f--L_._.__._-+--'-_._............. -+--'_._.......... -+-'___._.......... -+-'___._-'-'--

0 10 20 30 40 50 60 70 80 90 100 110 Power (% Rated)

Figure 3-2 Cycle 24 Power-Dependent LHGR Factor PR OOS, PR & FWH OOS, PR & EOC-RPT OOS, PR & EOC-RPT & FWH OOS Note: These factors to be applied to the exposure-dependent limits as descibed in Section 5.3

COLR Page 20 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

1.05 90, 1.000 110, 1.000 1.00 0.95 100, 1.000 0.90 0.85

£ 0.80 0 0.75 m C, 0.70

c 0.65

..J 0.60 0.55 0.50 0.45 0.40 0 10 20 30 40 50 60 70 80 90 100 110 120 Core Flow (% Rated)

Figure 3-3 Cycle 24 Flow-Dependent LHGR Factor Note: These factors to be applied to the exposure-dependent limits as descibed in Section 5.3

COLR Page 21 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

CORE FLOW (% rated) 0

I..

110 10 20 30 40 50 60 70 80 90 100 110 I I' T I I I I -T I 100 - Cycle 24 BSP Region I Implemented BSP Boundary 1-- ou, w ~2.8, 100 100, 00

... Boundaries for NFWT -r--::. ~ i.--"'" ~... 105, 1 ~ DO I MELLLA+ Boundary L _,,-....... -~ I,,,,,.. _,, L,.,--'"

90 I I --- r--:. ~............... ___ ~

80 ~5,80. 6.....-,,,,,,,,., ~ ~..,.,

...... ~ ~ I -

-10 : MELLLA Boundary. 'l I,1 J ~~ ~ ~ I J I'-.. I - ~ ~5 71.3. '~,~ i--""... ~ I I l! 60 ~,~ ~ / I

~

~ - OPRM Armed Region

- I,.,~ I/'/ I... I 0:: 50 - I r--,.c.,.... ~' ' 1 Saam Region -

~ ~. I 17 ~fl / I I

a. 40 L/' / Controlled "'- *

~ Entry I I --.-

l:l~ l/' I I -~

0 30 ~ I ---- -

0 R' - ----- I--,_ Ii.....-""'"

20 -

J / Ca titati1,n Pr, tecti --.. >O Note: -

10 / ~,, SLO is prohibited in MELLLA+ region -

1__........--111"' V i---- / -

0 --

0 10 20 30 40 50 60 70 80 90 100 110 120 ---

CORE FLOW (MLB/HR)

Figure 4 Backup Stability Protection Region Boundaries for Normal Feedwater Temperature (NFWT)

COLR Page 22 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

CORE FLOW (% rated) 0.0 10.0 20.0 30.0.. 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0..

110...... I

- Cycle 24 BSP Region (~2.s,,100J 100 - Boundaries for RFWT ~ L.,..-------- 105, 1,10(

J Implemented BSP Boundary 1 ~ I J ---,,,,,.--__, v-90 ---- l.......-.... ~

~ ~......--

80 ~ ":...-1

~ ~ V' !

-10 A2* _,,,,.,,,,-~ ~ I I 1 I MELLLA Boundary I ~1*....,r'Z ~. I

~60 I I"' ~ ~ 7 I

~ " ~ I~ ~ /~' I

- _..~ V.4 " / - II.

0:50 - - OPRM Armed Region ~..,

§ - ~ Saam Region L h Ii" I

  • j -- "'r----.... ~ ~~. I D.40..... ~

~ Controlled Entry I I i--I I ~..... ~

030 ll1' J ~ ~ --

0 __.....- I ~ ~

~'.l,_,_. ---

111119. J~

20 J / -- Ca ~itati mPr >tecti ()R

10 __,,,,,.,,, ~ / /

0 ---~ ~ /

0 10 20 30 40 50 60 70 80 90 100 110 120 CORE FLOW (MLB/HR)

Figure 5 Backup Stability Protection Region Boundaries for Reduced Feedwater Temperature (RFWT)

COLR Page 23 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

2.1

"' Operating Limit MCPR {P) = K{P)

  • Operating Limit

"' II D. MCPR(100)

..0 > 2 Q.

V For P<21.8% : No Thermal Limits Monitoring Q... 1.9 Required, No limits specified.

J! For 21.8%S:P~P(Bypass). P(Bypass)=35.4%

i:" OLMCPR(P)=1.90+0.0051 s*(35.4 %-P}. Flow < 50%

~ 1.8 A. OLMCPR(P}=1.90+0.01324.(35.4 %-P), Flow~50%

u

E

_, For P>P(Bypass) 0 1.7 K{P)=1.228, 35.4% < P s: 40%

'#.-- K{P)=1.177+0.00510*(50%-P), 40% < P s: 50%

~ K{P)=1.108+0.00345*(70%-P), 50% < P s: 70%

vi 1.6 M K{P)=1.082, 70% < P ~ 85%

I\\ K{P)=1.000+0.0054r(100%-P), 85% < P ~100%

Q.

J!.. 1.S i:"

~

..

  • 1.4 a.... 1.3
i

~

a: 1.2 Q.

u

~

-a 1.1

~

C, a:

20 30 40 so 60 70 80 90 100 110 Power (% rated)

Figure 6 MCPRp limit and K(P) Multiplier for EIS, FWH OOS, EOC-RPT OOS, FWH & EOC-RPT 00S

COLR Page 24 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

2.1

V, V, Operating Limit MCPR (P) = K(P)

  • Operating Limit Q. 2 MCPR(100)

.a >

0.. For P<21.8%: No Thermal Limits Monitoring V Required, No limits specified.

0.. 1.9...

J! For 21.8%S:PS:P(Bypass), P(Bypass)=35.4%

-0.. 1.8 OLMCPR(P)=1. 93+0.00294 *(35.4%-P), Flow<50%

~ 0.. OLMCPR(P)=1.93+0.01103.(35.4%-P), Flow~50%

u

t 1.7

_, For P>P(Bypass) 0 K(P)=1.357, 35.4% < P s: 50%

~ K(P)=1.347+0.000S0*(70%-P), 50% < P s: 70%

41.t K(P)=1.169+0.01187*(85%-P), 70% < P s: 85%

vi 1.6 (f) K(P)=1.000+0.00740*(100%-P). 85% < P S:100%

I\\

0..... 1.5 J!

-0..

'i2" 1.4 *

a... 1.3

-; :t

a: 1.2 0..

u

~

"'0

.. 1. 1

~

a:

1 20 30 40 50 60 70 80 90 100 110 Power (% rated)

Figure 7 MCPRp limit and K(P} Multiplier for PR OOS, PR & EOC-RPT 00S

COLR Page 25 LBDCR 2023-0056 CORE OPERATING LIMITS REPORT

MCPR(100) Operating Limit MCPR (P) = K(P)

  • Operating limit

For P<21.8% : No Thermal Limits Monitoring 1.9 Required, No limits specified.

For 21.8%S:PS:P(Bypass), P(Bypass)=35.4%

1.8 OLMCPR(P)=1.98 Flow<50%

OLMCPR(P)=1.98+0.00735*(35.4%-P), Flow~50%

1.7 For P>P(Bypass)

K(P)=1.357, 35.4% < P s: 50%

K(P)=1.347+0.00050*(70%-P), 50% < P s: 70%

1.6 K(P)=1.169+0.01187*(85%-P), 70% < P s: 85%

K(P)=1.000+0.00740*(100%-P). 85% < P S:100%

1.5

1.4

1.3

1.2

.... 1.1

1 20 30 40 50 60 70 90 100 110 Power (% rated)

Figure 8 MCPRp Limit and K(P) Multiplier for PR & FWH 00S, PR & FWH & EOC-RPT 00S

COLR Page 26 LBDCR 2023-0056

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