NL-21-0091, Cycle 27 Core Operating Limits Report Version 1

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Cycle 27 Core Operating Limits Report Version 1
ML21050A246
Person / Time
Site: Hatch Southern Nuclear icon.png
Issue date: 02/19/2021
From: Gayheart C
Southern Nuclear Operating Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML21050A245 List:
References
NL-21-0091
Download: ML21050A246 (62)
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3535 Colonnade Parkway Birmingham, AL 35243 205 992 5316 cagayhea@southernco.com Cheryl A. Gayheart Regulatory Affairs Director February 19, 2021 Docket No.:

50-366 NL-21-0091 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclear Plant - Unit 2 Cycle 27 Core Operating Limits Report Version 1 Ladies and Gentlemen:

In accordance with Technical Specification 5.6.5.d., Southern Nuclear Operating Company (SNC) submits the enclosed Core Operating Limits Report (COLR), for Edwin I. Hatch Nuclear Plant (HNP) Unit 2 Cycle 27.

The enclosed documentation contains proprietary information as defined by 10 CFR 2.390.

Global Nuclear Fuel (GNF), as the owner of the proprietary information, has executed the enclosed affidavit, which identifies that the enclosed proprietary information has been handled and classified as proprietary, is customarily held in confidence, and has been withheld from public disclosure. The proprietary information was provided to SNC in a GNF transmittal that is referenced by the affidavit. The proprietary information has been faithfully reproduced in the enclosed documentation, such that the affidavit remains applicable. GNF hereby requests that the proprietary information provided in Enclosure 1 to this letter be withheld from public disclosure in accordance with the provisions of 10 CFR 2.390 and 9.17. A non-proprietary version of the COLR is provided as Enclosure 2 to this letter. The affidavit is also provided in to this letter and identifies that the designated information has been handled and classified as proprietary to GNF.

This letter contains no NRC commitments. If you have any questions, please contact Jamie Coleman at 205.992.6611.

Respectfully submitted, Cheryl A. Gayheart Regulatory Affairs Director to this letter contains Proprietary Information to be withheld from public disclosure per 10 CFR 2.390. When separated from Enclosure 1 this transmittal document is decontrolled.

U. S. Nuclear Regulatory Commission NL-21-0091 Page 2 CAG/tle/cbg

Enclosures:

1. HNP Unit 2 Cycle 27 Core Operating Limits Report Version 1 PROPRIETARY INFORMATION and Global Nuclear Fuel - Americas Affidavit
2. HNP Unit 2 Cycle 27 Core Operating Limits Report Version 1 NON-PROPRIETARY INFORMATION Cc:

Regional Administrator, Region ll NRR Project Manager - Hatch Senior Resident Inspector - Hatch RTYPE: CHA02.004

Edwin I. Hatch Nuclear Plant - Unit 2 Cycle 27 Core Operating Limits Report Version 1 HNP Unit 2 Cycle 27 Core Operating Limits Report Version 1 NON-PROPRIETARY INFORMATION

Non-Proprietary Information SOUTHERN NUCLEAR OPERATING COMPANY EDWIN I. HATCH NUCLEAR PLANT Unit 2 Cycle 27 CORE OPERATING LIMITS REPORT Version 1

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 2

TABLE OF CONTENTS Section Title Page 1.0 Introduction 7

2.0 APLHGR Operating Limits 12 3.0 MCPR Operating Limits 14 4.0 LHGR Operating Limits 44 5.0 Operating Pressure Limits 55 6.0 References 59

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 3

TABLES Table No.

Title Page 1-1 System Operability Requirements 8

1-2 Equipment Requirements 9

1-3 Equipment Condition In/Out of Service Limitations 10 1-4 Exposure Definitions 11 3-1 Cycle Specific MCPR Safety Limit 17 3-2 Power-Dependent MCPRP Limit Operating Flexibility Options (for Core Power 28% of Rated) 17 3-3 Power-Dependent KP MCPR Limit Multiplier Flexibility Options (for Core Power > 28% of Rated) 18 3-4 Rated-Power OLMCPR Operating Flexibility Options 19 4-1 Rated-Power LHGR Limits versus Peak Pellet Exposure 45 4-2 Flow-Dependent LHGRFACF Limit Multiplier Operating Flexibility Options 46 4-3 Power-Dependent LHGRFACP Limit Multiplier Operating Flexibility Options 47 5-1 Pressure Dependent Operating Flexibility Options 58 5-2 MFLCPR and MFLPD Limits versus Operating Pressure Regions 58

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 4

FIGURES Figure No.

Title Page 2-1 APLHGR Limits versus Average Planar Exposure 13 3-1 Flow-Dependent MCPR Limit (MCPRF) versus Core Flow 21 3-2A Power-Dependent MCPR Limit (MCPRP) versus Core Power 22 3-2B Power-Dependent MCPR Limit (MCPRP) versus Core Power (Main Turbine Bypass System Inoperable) 23 3-3A Power-Dependent MCPR Limit Multiplier (KP) versus Core Power 24 3-3B Power-Dependent MCPR Limit Multiplier (KP) versus Core Power (Main Turbine Pressure Regulator System in TLCO 3.3.13.c) 25 3-4A-1 Rated-Power TLO MCPR Limits versus Average SCRAM Time 26 3-4A-2 Rated-Power TLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable) 27 3-4A-3 Rated-Power TLO MCPR Limits versus Average SCRAM Time (EOC-RPT System Inoperable) 28 3-4A-4 Rated-Power TLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable &

EOC-RPT System Inoperable) 29 3-4A-5 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service) 30 3-4A-6 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

Main Turbine Bypass System Inoperable) 31

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 5

Figure No.

Title Page 3-4A-7 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

EOC-RPT System Inoperable) 32 3-4A-8 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

Main Turbine Bypass System Inoperable &

EOC-RPT System Inoperable) 33 3-4B-1 Rated-Power SLO MCPR Limits versus Average SCRAM Time 34 3-4B-2 Rated-Power SLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable) 35 3-4B-3 Rated-Power SLO MCPR Limits versus Average SCRAM Time (EOC-RPT System Inoperable) 36 3-4B-4 Rated-Power SLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable &

EOC-RPT System Inoperable) 37 3-4B-5 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service) 38 3-4B-6 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

Main Turbine Bypass System Inoperable) 39 3-4B-7 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

EOC-RPT System Inoperable) 40 3-4B-8 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

Main Turbine Bypass System Inoperable &

EOC-RPT System Inoperable) 41 3-5A High Worth Scram Rod Set - A1 Configuration 42

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 6

Figure No.

Title Page 3-5B High Worth Scram Rod Set - A2 Configuration 43 4-1A GNF2 & GNF3 LTA Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow 48 4-1B GNF2 & GNF3 LTA Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow (Main Turbine Bypass System Inoperable) 49 4-1C GNF3 Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow 50 4-2A GNF2, GNF3 LTA, & GNF3 Power-Dependent LHGR Limit Multiplier (LHGRFACP) versus Core Power 51 4-2B GNF2, GNF3 LTA, & GNF3 Power-Dependent LHGR Limit Multiplier (LHGRFACP) versus Core Power (High Pressure Feedwater Heaters Out of Service) 52 4-3A GNF2 & GNF3 LTA Rated-Power LHGR Limit versus Peak Pellet Exposure 53 4-3B GNF3 Rated-Power LHGR Limit versus Peak Pellet Exposure 54 5-1 Licensed Regions of Operating Dome Pressure versus Core Power 57

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 7

tabcount 1.

tablecount figcount 1.

figurecount

1.0 INTRODUCTION

The Core Operating Limits Report (COLR) for Plant Hatch Unit 2 Cycle 27 is prepared in accordance with the requirements of Technical Specification 5.6.5. The core operating limits presented herein were developed using NRC-approved methods (Reference 1). This reload includes GNF2, GNF3 Lead Test Assembly (LTA), and GNF3 fuel types (References 2 through 4). Results from the associated reload analyses for the fuel in Unit 2 Cycle 27 are documented in References 5 through 7.

The following core operating limits are included in this report:

a. Average Planar Linear Heat Generation Rate (APLHGR) - Technical Specification 3.2.1
b. Minimum Critical Power Ratio (MCPR) - Technical Specification 3.2.2
c. Linear Heat Generation Rate (LHGR) - Technical Specification 3.2.3 This report also includes limits on the Maximum Fraction of Limiting Critical Power Ratio (MFLCPR) and Maximum Fraction of Limiting Power Density (MFLPD) thermal limit ratios, which may be used in conjunction with the standard core operating limits to allow operation with dome pressure down to 40 psi below nominal.

Related system operability requirements are defined in Table 1-1. Other equipment requirements which must be satisfied for operating limits included in this report to remain applicable are defined in Table 1-2.

Operating limit flexibility options are provided for various equipment in/out of service conditions, dependent on the number of operating recirculation loops, operability of the main turbine bypass system, operability of the End-of-Cycle Recirculation Pump Trip (EOC-RPT) system, status of the main turbine pressure regulator system, configuration of the high pressure feedwater heaters, and configuration of High Worth Scram Rods (HWSRs). Plant operational limitations associated with specific equipment in/out of service combinations are defined in Table 1-3.

Operating limits are presented in this report as a function of fuel type, core power, core flow, average scram time, and exposure. These limits are not a function of feedwater temperature.

Cycle exposure intervals used in the presentation of limits in this report are defined in Table 1-4.

Operating limits between tabulated values presented in this report are based on linear interpolation.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 8

TABLE 1-1 System Operability Requirements System Operability Requirement Main Turbine Bypass System Operable (Technical Specification 3.7.7)

At least two bypass valves must be operable

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 9

TABLE 1-2 Equipment Requirements Equipment Requirement Recirculation Flow Control System The maximum achievable core flow on the highest licensed rod line must be limited to less than 107% of rated core flow Turbine Power/Load Unbalance Trip Logic When operating at greater than 55% core thermal power, the turbine Power/Load Unbalance (PLU) trip logic must be functional Feedwater Heaters For any 4th stage feedwater heater configuration off-normal, High Pressure Feedwater Heaters Out of Service limits must be applied (unless the standard LFWH analysis is demonstrated to remain applicable by BWR Fuel Engineering)

APRM System The Oscillation Power Range Monitor (OPRM)

Period Based Detection Algorithm (PBDA) amplitude trip setpoint must be set equal to 1.15 High Worth Scram Rod (HWSR)

An individual High Worth Scram Rod must satisfy the following conditions to be valid for thermal operating limit improvements:

Correspond to a licensed HWSR pattern, as defined in Figure 3-5.

Control rod is inserted to a licensed HWSR notch location, as defined in Figure 3-5.

All diagonal-adjacent and face-adjacent control rods are fully withdrawn as defined by the Figure 3-5 exclusion regions.

Control rod scram time is not "slow," in accordance with Technical Specification Table 3.1.4-1.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 10 TABLE 1-3 Equipment Condition In/Out of Service Limitations Condition Limitation Single-Loop Operation (SLO)

  • Core power must be 2000 MWth

High Worth Scram Rods In Service

  • The core must be operating with a set of four (4) valid High Worth Scram Rods (as defined in Table 1-2)
  • The Main Turbine Pressure Regulator System must be in TLCO 3.3.13.a or b Main Turbine Pressure Regulator System in TLCO 3.3.13.c High Worth Scram Rods In Service core operating limits are NOT applicable

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 11 TABLE 1-4 Exposure Definitions Exposure Label Definition Cycle Exposure BOC Beginning of Cycle Exposure 0 MWd/ST MOC1 First Middle of Cycle Exposure EOR - 5000 MWd/ST MOC2 Second Middle of Cycle Exposure EOR - 3500 MWd/ST EOR End of Rated Exposure Projected exposure at end of rated power with all control rods out, rated core flow, and rated feedwater temperature EOC End of Cycle Exposure Exposure at cycle shutdown

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 12 tabcount 2.

tablecount figcount 2.

figurecount 2.0 APLHGR OPERATING LIMITS For both two loop operation (TLO) and single loop operation (SLO), the APLHGR operating limit for each six inch axial segment of each fuel assembly in the core is the applicable fuel-type-specific APLHGR limit defined in Figure 2-1.

No flow dependent or power dependent APLHGR limit multipliers (MAPFACF or MAPFACP) are required. For SLO, no unique limit on MAPFACF or MAPFACP is required.

These limits apply to operation over the full range of licensed dome pressure regions shown in Figure 5-1.

(Technical Specification 3.2.1)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 13 FIGURE 2-1 APLHGR Limits versus Average Planar Exposure 0.00 13.78 17.15 13.78 60.78 6.87 63.50 5.50 0.00 14.36 9.07 13.78 21.22 13.01 40.82 10.75 57.60 8.00 63.50 6.00 Average Planar Exposure (GWd/ST)

GNF3 APLHGR Limit (kW/ft)

Average Planar Exposure (GWd/ST)

GNF2 GNF3 LTA APLHGR Limit (kW/ft) 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0 13.0 14.0 15.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 APLHGR Limit (kW/ft)

Average Planar Exposure (GWd/ST)

GNF2

& GNF3 LTA GNF3

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 14 tabcount 3.

tablecount figcount 3.

figurecount 3.0 MCPR OPERATING LIMITS The MCPR operating limit (OLMCPR) for each licensed equipment in or out of service operating flexibility combination is independent of fuel type, and is a function of core power, core flow, average scram time, and cycle exposure.

The cycle-specific MCPR safety limits (SLMCPRs) are specified in Table 3-1.

For both two loop operation (TLO) and single loop operation (SLO), the OLMCPR is determined as follows:

a. For 24% core power 28%, the greater of either:
1) The flow-dependent MCPR limit, MCPRF, as determined by Figure 3-1, OR
2) The power-dependent MCPR limit, MCPRP, as determined by Table 3-2.
b. For core power > 28%, the greater of either:
1) MCPRF, as determined by Figure 3-1, OR
2) The product of the power-dependent MCPR limit multiplier (KP), as determined by Table 3-3, and the scram-time dependent rated-power OLMCPR, as determined by Table 3-4.

The scram-time dependent value of used to determine the rated-power OLMCPR is calculated in accordance with Section 3.1. For High Worth Scram Rods In Service operation, Section 3.2 is also applicable to determine the value of.

Limits for operation with High Worth Scram Rods In Service apply to operation with four valid individual High Worth Scram Rods (HWSRs), as defined in Table 1-3. The licensed sets of HWSRs are defined in the Figure 3-5 series. Individual credited HWSRs must meet the equipment requirements defined in Table 1-2 to be considered valid for thermal operating limit credit. Operating conditions which credit HWSRs provide MCPR operating limit improvements in the MOC2-EOC exposure interval relative to limits which do not credit HWSRs.

The limits presented in this section apply to operation with vessel dome pressure within

+/- 10 psi of nominal pressure, as defined by the Region I pressure band shown in Figure 5-1.

With Standard Equipment In Service, with the EOC-RPT System Inoperable, and/or with High Worth Scram Rods In Service, operation with vessel dome pressure down to 40 psi below nominal is licensed provided the additional restrictions identified in Section 5.0 are applied with the OLMCPR defined in this section.

(Technical Specification 3.2.2)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 15 3.1.

AVERAGE SCRAM TIME REQUIREMENTS In the 3-4A and 3-4B figures, Option A scram time rated-power OLMCPRs correspond to

= 1.0, where is determined from scram time measurements performed in accordance with Technical Specifications Surveillance Requirements 3.1.4.1 and 3.1.4.2. Option B values correspond to = 0.0. For scram times between Option A and Option B, the rated-power OLMCPR corresponds to. If has not been determined, Option A limits must be used.

The average scram time of the control rods,, is defined as:

= 0, OR B

A B

ave

, whichever is greater.

where:

A

= 1.08 sec (Technical Specification 3.1.4, Table 3.1.4-1, scram time limit to notch 36).

B

=

2 1

n 1

i i

1 N

N

1.65

+

=

where:

= 0.822 sec (mean scram time to notch 36 used in the transient analysis).

= 0.018 sec (standard deviation of ).

1 N = total number of active rods measured in Technical Specifications Surveillance Requirement 3.1.4.1.

n = number of surveillance tests performed to date in the cycle.

i N = number of active control rods measured in the ith surveillance test.

ave

=

=

=

n 1

i i

n 1

i i

i N

N where:

i = average scram time to notch 36 of all rods in the ith surveillance test.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 16 3.2.

HIGH WORTH SCRAM ROD SCRAM TIME REQUIREMENTS For High Worth Scram Rods In Service operation, the value of used to determine the MCPR limit is the greater of either:

a. The average scram time of the control rods,, as defined in Section 3.1, OR
b. The maximum of the individually calculated values of for the credited high worth scram rods.

If individually calculated values of for all credited high worth scram rods have not been determined, then non-HWSR limits must be used.

The value of for an individual high worth scram rod is defined as:

= 0, OR HWSR - B A - B

, whichever is greater.

where:

A = 1.08 sec (Technical Specification 3.1.4, Table 3.1.4-1, scram time limit to notch 36).

B = 0.822 sec (mean scram time to notch 36 used in the transient analysis).

HWSR = most recent measurement of the individual rod scram time from notch 48 to notch 36 (in seconds).

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 17 TABLE 3-1 Cycle Specific MCPR Safety Limit Two Loop Operation Single Loop Operation 1.07 1.09 TABLE 3-2 Power-Dependent MCPRP Limit Operating Flexibility Options (for Core Power 28% of Rated)

Equipment In/Out of Service Figure #

Main Turbine Bypass System Operable EOC-RPT System Operable Main Turbine Pressure Regulator System Status High Pressure Feedwater Heaters In Service High Worth Scram Rods In Service Yes Yes/No TLCO 3.3.13.a or b Yes/No Yes/No 3-2A TLCO 3.3.13.c Yes No No Yes/No TLCO 3.3.13.a or b Yes/No Yes/No 3-2B TLCO 3.3.13.c Yes No Yes/No Yes/No TLCO 3.3.13.c Yes Yes Non-HWSR Limits Apply

  • No Yes/No Not Licensed
  • The Main Turbine Pressure Regulator System must be in TLCO 3.3.13.a or b for High Worth Scram Rods to be considered In Service, as described in Table 1-3.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 18 TABLE 3-3 Power-Dependent KP MCPR Limit Multiplier Flexibility Options (for Core Power > 28% of Rated)

Equipment In/Out of Service Figure #

Main Turbine Bypass System Operable EOC-RPT System Operable Main Turbine Pressure Regulator System Status High Pressure Feedwater Heaters In Service High Worth Scram Rods In Service Yes/No Yes/No TLCO 3.3.13.a or b Yes/No Yes/No 3-3A TLCO 3.3.13.c Yes No 3-3B Yes Non-HWSR Limits Apply

  • No Yes/No Not Licensed
  • The Main Turbine Pressure Regulator System must be in TLCO 3.3.13.a or b for High Worth Scram Rods to be considered In Service, as described in Table 1-3.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 19 TABLE 3-4 Rated-Power OLMCPR Operating Flexibility Options Equipment In/Out of Service Figure #

TLO SLO Standard Equipment In Service 3-4A-1 3-4B-1 Main Turbine Bypass System Inoperable 3-4A-2 3-4B-2 EOC-RPT System Inoperable 3-4A-3 3-4B-3 Main Turbine Bypass System Inoperable AND EOC-RPT System Inoperable 3-4A-4 3-4B-4 Main Turbine Pressure Regulator System in TLCO 3.3.13.c 3-4A-1 3-4B-1 Main Turbine Pressure Regulator System in TLCO 3.3.13.c AND Main Turbine Bypass System Inoperable 3-4A-2 3-4B-2 EOC-RPT System Inoperable 3-4A-3 3-4B-3 Main Turbine Bypass System Inoperable AND EOC-RPT System Inoperable 3-4A-4 3-4B-4 High Pressure Feedwater Heaters Out of Service 3-4A-1 3-4B-1 High Pressure Feedwater Heaters Out of Service AND Main Turbine Bypass System Inoperable 3-4A-2 3-4B-2 EOC-RPT System Inoperable 3-4A-3 3-4B-3 Main Turbine Bypass System Inoperable AND EOC-RPT System Inoperable 3-4A-4 3-4B-4

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 20 TABLE 3-4 (continued)

Rated-Power OLMCPR Operating Flexibility Options Equipment In/Out of Service Figure #

TLO SLO High Worth Scram Rods In Service 3-4A-5 3-4B-5 High Worth Scram Rods In Service AND Main Turbine Bypass System Inoperable 3-4A-6 3-4B-6 EOC-RPT System Inoperable 3-4A-7 3-4B-7 Main Turbine Bypass System Inoperable AND EOC-RPT System Inoperable 3-4A-8 3-4B-8 High Worth Scram Rods In Service AND High Pressure Feedwater Heaters Out of Service 3-4A-5 3-4B-5 High Worth Scram Rods In Service AND High Pressure Feedwater Heaters Out of Service AND Main Turbine Bypass System Inoperable 3-4A-6 3-4B-6 EOC-RPT System Inoperable 3-4A-7 3-4B-7 Main Turbine Bypass System Inoperable AND EOC-RPT System Inoperable 3-4A-8 3-4B-8

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 21 FIGURE 3-1 Flow-Dependent MCPR Limit (MCPRF) versus Core Flow Flow (% of Rated)

MCPRF (TLO) 30.0 1.52 85.0 1.20 110.0 1.20 MCPRF(SLO) = MCPRF(TLO) + 0.03 1.10 1.20 1.30 1.40 1.50 1.60 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 Flow-Dependent MCPR Limit (MCPRF)

Core Flow (% of Rated)

TLO

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 22 FIGURE 3-2 figurecount FIGURE 3-2A Power-Dependent MCPR Limit (MCPRP) versus Core Power Flow (% of Rated)

Power (% of Rated)

MCPRP (TLO) 24.0 2.40 28.0 2.35 24.0 2.35 28.0 2.35 60.0

< 60.0 MCPRP(SLO) = MCPRP(TLO) + 0.03 2.30 2.40 2.50 2.60 2.70 2.80 24.0 28.0 Power-Dependent MCPR Limit (MCPRP)

Core Power (% of Rated)

Flow 60%

Flow < 60%

TLO

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 23 FIGURE 3-2B Power-Dependent MCPR Limit (MCPRP) versus Core Power (Main Turbine Bypass System Inoperable)

Flow (% of Rated)

Power (% of Rated)

MCPRP (TLO) 24.0 2.71 28.0 2.71 24.0 2.64 28.0 2.45 60.0

< 60.0 MCPRP(SLO) = MCPRP(TLO) + 0.03 2.30 2.40 2.50 2.60 2.70 2.80 24.0 28.0 Power-Dependent MCPR Limit (MCPRP)

Core Power (% of Rated)

Flow 60%

Flow < 60%

TLO

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 24 FIGURE 3-3 figurecount FIGURE 3-3A Power-Dependent MCPR Limit Multiplier (KP) versus Core Power KP (TLO/SLO)

> 28.0 1.413 45.0 1.285 55.0 1.285

> 55.0 1.150 60.0 1.150 85.0 1.070 100.0 1.000 Power (% of Rated) 28 30.0 40.0 50.0 55 60.0 70.0 80.0 90.0 100.0 1.000 1.100 1.200 1.300 1.400 1.500 28.0 Power-Dependent MCPR Limit Multiplier (KP)

Core Power (% of Rated)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 25 FIGURE 3-3B Power-Dependent MCPR Limit Multiplier (KP) versus Core Power (Main Turbine Pressure Regulator System in TLCO 3.3.13.c)

KP (TLO/SLO)

> 28.0 1.413 45.0 1.285 60.0 1.285 85.0 1.196

> 85.0 1.085 100.0 1.000 Power (% of Rated) 28 30.0 40.0 50.0 60.0 70.0 80.0 85 90.0 100.0 1.000 1.100 1.200 1.300 1.400 1.500 28.0 Power-Dependent MCPR Limit Multiplier (KP)

Core Power (% of Rated)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 26 FIGURE 3-4 figurecount FIGURE 3-4A figurecount FIGURE 3-4A-1 Rated-Power TLO MCPR Limits versus Average SCRAM Time

= 0.0

= 1.0 1.32 1.46 1.37 1.51 1.40 1.54 Exposure Range Rated OLMCPR(TLO)

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 27 FIGURE 3-4A-2 Rated-Power TLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable)

= 0.0

= 1.0 1.35 1.51 1.39 1.55 1.43 1.59 BOC - MOC1 Rated OLMCPR(TLO)

MOC1 - MOC2 Exposure Range MOC2 - EOC 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 28 FIGURE 3-4A-3 Rated-Power TLO MCPR Limits versus Average SCRAM Time (EOC-RPT System Inoperable)

= 0.0

= 1.0 1.33 1.52 1.38 1.57 1.48 1.67 MOC1 - MOC2 MOC2 - EOC BOC - MOC1 Exposure Range Rated OLMCPR(TLO) 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 29 FIGURE 3-4A-4 Rated-Power TLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable

& EOC-RPT System Inoperable)

= 0.0

= 1.0 1.36 1.54 1.41 1.59 1.51 1.69 BOC - MOC1 MOC1 - MOC2 MOC2 - EOC Exposure Range Rated OLMCPR(TLO) 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 30 FIGURE 3-4A-5 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service)

= 0.0

= 1.0 1.32 1.46 1.37 1.51 1.37 1.51 Exposure Range Rated OLMCPR(TLO)

MOC1 - MOC2 MOC2 - EOC BOC - MOC1 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 31 FIGURE 3-4A-6 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service

& Main Turbine Bypass System Inoperable)

= 0.0

= 1.0 1.35 1.51 1.39 1.55 1.40 1.56 Exposure Range Rated OLMCPR(TLO)

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 32 FIGURE 3-4A-7 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service

& EOC-RPT System Inoperable)

= 0.0

= 1.0 1.33 1.52 1.38 1.57 1.42 1.61 Exposure Range Rated OLMCPR(TLO)

MOC2 - EOC MOC1 - MOC2 BOC - MOC1 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 33 FIGURE 3-4A-8 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service

& Main Turbine Bypass System Inoperable

& EOC-RPT System Inoperable)

= 0.0

= 1.0 1.36 1.54 1.41 1.59 1.45 1.65 Rated OLMCPR(TLO)

Exposure Range MOC2 - EOC BOC - MOC1 MOC1 - MOC2 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 34 FIGURE 3-4B figurecount FIGURE 3-4B-1 Rated-Power SLO MCPR Limits versus Average SCRAM Time

= 0.0

= 1.0 1.40 1.49 1.40 1.54 1.43 1.57 MOC1 - MOC2 MOC2 - EOC Rated OLMCPR(SLO)

BOC - MOC1 Exposure Range 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 35 FIGURE 3-4B-2 Rated-Power SLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable)

= 0.0

= 1.0 1.40 1.54 1.42 1.58 1.46 1.62 BOC - MOC1 MOC1 - MOC2 MOC2 - EOC Exposure Range Rated OLMCPR(SLO) 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 36 FIGURE 3-4B-3 Rated-Power SLO MCPR Limits versus Average SCRAM Time (EOC-RPT System Inoperable)

= 0.0

= 1.0 1.40 1.55 1.41 1.60 1.51 1.70 Exposure Range Rated OLMCPR(SLO)

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 37 FIGURE 3-4B-4 Rated-Power SLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable

& EOC-RPT System Inoperable)

= 0.0

= 1.0 1.40 1.57 1.44 1.62 1.54 1.72 Exposure Range Rated OLMCPR(SLO)

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 38 FIGURE 3-4B-5 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service)

= 0.0

= 1.0 1.40 1.49 1.40 1.54 1.40 1.54 Exposure Range Rated OLMCPR(SLO)

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 39 FIGURE 3-4B-6 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service

& Main Turbine Bypass System Inoperable)

= 0.0

= 1.0 1.40 1.54 1.42 1.58 1.43 1.59 Exposure Range Rated OLMCPR(SLO)

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 40 FIGURE 3-4B-7 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service

& EOC-RPT System Inoperable)

= 0.0

= 1.0 1.40 1.55 1.41 1.60 1.45 1.64 Exposure Range Rated OLMCPR(SLO)

BOC - MOC1 MOC2 - EOC MOC1 - MOC2 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 41 FIGURE 3-4B-8 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service

& Main Turbine Bypass System Inoperable

& EOC-RPT System Inoperable)

= 0.0

= 1.0 1.40 1.57 1.44 1.62 1.48 1.68 Rated OLMCPR(SLO)

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC Exposure Range 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 0.0 0.2 0.4 0.6 0.8 1.0 MCPR Limit MCPR Limit

BOC - MOC1 MOC1 - MOC2 MOC2 - EOC (High Worth Scram Rods Credited)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 42 FIGURE 3-5 figurecount FIGURE 3-5A High Worth Scram Rod Set - A1 Configuration 02 06 10 14 18 22 26 30 34 38 42 46 50 51 51 47 47 43 43 39

+

+

39 35 35 31 31 27 27 23 23 19 19 15

+

+

15 11 11 07 07 03 03 02 06 10 14 18 22 26 30 34 38 42 46 50 Licensed High Worth Scram Rod:

+

High Worth Scram Rod Exclusion Region:

Maximum High Worth Scram Rod Depth (Notch):

32 Minimum High Worth Scram Rod Depth (Notch):

36 Licensed HWSR Coordinates (IX-JY) 14-15 14-39 38-15 38-39 Notch 00 02 04 06 08 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Notch HWSR Depths Inserted Withdrawn Licensed

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 43 FIGURE 3-5B High Worth Scram Rod Set - A2 Configuration 02 06 10 14 18 22 26 30 34 38 42 46 50 51 51 47 47 43

+

43 39 39 35 35 31 31 27

+

+

27 23 23 19 19 15 15 11

+

11 07 07 03 03 02 06 10 14 18 22 26 30 34 38 42 46 50 Licensed High Worth Scram Rod:

+

High Worth Scram Rod Exclusion Region:

Maximum High Worth Scram Rod Depth (Notch):

32 Minimum High Worth Scram Rod Depth (Notch):

36 Licensed HWSR Coordinates (IX-JY) 10-27 26-11 26-43 42-27 Notch 00 02 04 06 08 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 Notch HWSR Depths Inserted Withdrawn Licensed

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 44 tabcount 4.

tablecount figcount 4.

figurecount 4.0 LHGR OPERATING LIMITS The LHGR operating limit for each licensed equipment in or out of service operating flexibility combination is independent of average scram time, and is a function of fuel bundle type, fuel rod type, core power, core flow, cycle exposure, and pellet exposure.

For both two loop operation (TLO) and single loop operation (SLO), the LHGR operating limit for each six inch axial segment of each fuel rod in the core is the applicable rated-power, rated-flow LHGR limit taken from Table 4-1 multiplied by the smaller of either:

a. The flow-dependent LHGR limit multiplier, LHGRFACF, as determined by Table 4-2, OR
b. The power-dependent LHGR limit multiplier, LHGRFACP, as determined by Table 4-3.

Table 4-1 shows the exposure-dependent LHGR limits for all fuel types in the core, as a function of initial gadolinium concentration in a six inch segment of a fuel rod. Figures 4-3A and 4-3B show the LHGR limits for both UO2 fuel segments and for fuel segments with the highest initial Gd (Gd2O3) concentrations.

These limits apply to operation with vessel dome pressure within +/- 10 psi of nominal pressure, as defined by the Region I pressure band shown in Figure 5-1. With Standard Equipment In Service, with the EOC-RPT System Inoperable, and/or with High Worth Scram Rods In Service, operation with vessel dome pressure down to 40 psi below nominal is licensed provided the additional restrictions identified in Section 5.0 are applied with the LHGR operating limit defined in this section.

(Technical Specification 3.2.3)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 45 TABLE 4-1 Rated-Power LHGR Limits versus Peak Pellet Exposure

((

))

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 46 TABLE 4-2 Flow-Dependent LHGRFACF Limit Multiplier Operating Flexibility Options Fuel Type Equipment In/Out of Service Figure #

Main Turbine Bypass System Operable EOC-RPT System Operable Main Turbine Pressure Regulator System Status High Pressure Feedwater Heaters In Service High Worth Scram Rods In Service GNF2 GNF3 LTA Yes Yes/No TLCO 3.3.13.a or b Yes/No Yes/No 4-1A TLCO 3.3.13.c Yes No No TLCO 3.3.13.a or b Yes/No Yes/No 4-1B TLCO 3.3.13.c Yes No GNF3 Yes/No Yes/No TLCO 3.3.13.a or b Yes/No Yes/No 4-1C TLCO 3.3.13.c Yes No ALL Yes/No Yes/No TLCO 3.3.13.c Yes Yes Non-HWSR Limits Apply

  • No Yes/No Not Licensed
  • The Main Turbine Pressure Regulator System must be in TLCO 3.3.13.a or b for High Worth Scram Rods to be considered In Service, as described in Table 1-3.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 47 TABLE 4-3 Power-Dependent LHGRFACP Limit Multiplier Operating Flexibility Options Fuel Type Equipment In/Out of Service Figure #

Main Turbine Bypass System Operable EOC-RPT System Operable Main Turbine Pressure Regulator System Status High Pressure Feedwater Heaters In Service High Worth Scram Rods In Service ALL Yes/No Yes/No TLCO 3.3.13.a or b Yes Yes/No 4-2A No Yes/No 4-2B TLCO 3.3.13.c Yes No 4-2A Yes Non-HWSR Limits Apply

  • No Yes/No Not Licensed
  • The Main Turbine Pressure Regulator System must be in TLCO 3.3.13.a or b for High Worth Scram Rods to be considered In Service, as described in Table 1-3.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 48 FIGURE 4-1A GNF2 & GNF3 LTA Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow Flow (% of Rated)

LHGRFACF (TLO/SLO) 30.0 0.557 50.0 0.795 80.0 0.998 90.0 1.000 110.0 1.000 0.400 0.500 0.600 0.700 0.800 0.900 1.000 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 Flow-Dependent LHGR Multiplier (LHGRFACF)

Core Flow (% of Rated)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 49 FIGURE 4-1B GNF2 & GNF3 LTA Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow (Main Turbine Bypass System Inoperable)

Flow (% of Rated)

LHGRFACF (TLO/SLO) 30.0 0.527 50.0 0.625 60.0 0.792 90.0 0.993 100.0 1.000 110.0 1.000 0.400 0.500 0.600 0.700 0.800 0.900 1.000 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 Flow-Dependent LHGR Multiplier (LHGRFACF)

Core Flow (% of Rated)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 50 FIGURE 4-1C GNF3 Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow Flow (% of Rated)

LHGRFACF (TLO/SLO) 30.0 0.572 40.0 0.683 50.0 0.772 60.0 0.863 70.0 0.930 80.0 0.998 90.0 1.000 110.0 1.000 0.400 0.500 0.600 0.700 0.800 0.900 1.000 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 110.0 Flow-Dependent LHGR Multiplier (LHGRFACF)

Core Flow (% of Rated)

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 51 FIGURE 4-2 figurecount FIGURE 4-2A GNF2, GNF3 LTA, & GNF3 Power-Dependent LHGR Limit Multiplier (LHGRFACP) versus Core Power LHGRFACP (TLO/SLO) 24.0 0.415 28.0 0.445

> 28.0 0.583 45.0 0.713 55.0 0.765 85.0 0.922 100.0 1.000 Power (% of Rated) 24 28 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 0.400 0.500 0.600 0.700 0.800 0.900 1.000 24.0 Power-Dependent LHGR Multiplier (LHGRFACP)

Core Power (% of Rated)

BOC - EOC

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 52 FIGURE 4-2B GNF2, GNF3 LTA, & GNF3 Power-Dependent LHGR Limit Multiplier (LHGRFACP) versus Core Power (High Pressure Feedwater Heaters Out of Service)

LHGRFACP (TLO/SLO)

LHGRFACP (TLO/SLO) 24.0 0.415 24.0 0.415 28.0 0.445 28.0 0.445

> 28.0 0.583

> 28.0 0.583 45.0 0.702 45.0 0.713 80.0 0.702 55.0 0.765 85.0 0.754 73.0 0.855 100.0 1.000 85.0 0.855 89.0 0.943 100.0 1.000 Power (% of Rated)

Power (% of Rated)

BOC - EOR EOR - EOC 24 28 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 0.400 0.500 0.600 0.700 0.800 0.900 1.000 24.0 Power-Dependent LHGR Multiplier (LHGRFACP)

Core Power (% of Rated)

BOC - EOC EOR - EOC BOC - EOR

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 53 FIGURE 4-3 figurecount

((

` ` ` ` ))

FIGURE 4-3A GNF2 & GNF3 LTA Rated-Power LHGR Limit versus Peak Pellet Exposure

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 54

((

` ` ` ` ))

FIGURE 4-3B GNF3 Rated-Power LHGR Limit versus Peak Pellet Exposure

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 55 tabcount 5.

tablecount figcount 5.

figurecount 5.0 OPERATING PRESSURE LIMITS The operating limits presented within this report require that reactor dome pressure be maintained within the licensed pressure bands defined by Figure 5-1. For operation in each of these regions, the following pressure dependent restrictions apply:

a. For Region I operation:

The core operating limits from Sections 2.0 through 4.0 are applicable.

b. For Region II and Region III operation:
1) The core operating limits from Sections 2.0 through 4.0 are applicable AND
2) The MFLCPR and MFLPD thermal limit ratios must remain below the maximum values determined by Table 5-1.

These restrictions are independent of core power, core flow, cycle exposure, feedwater temperature, the number of operating recirculation loops, and average scram time.

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 56 5.1.

THERMAL LIMIT RATIO DEFINITIONS The MFLCPR and MFLPD thermal limit ratios are defined in terms of the core operating limits defined in Section 3.0 and Section 4.0.

The MFLCPR thermal limit ratio is the most limiting (maximum) value of the Fraction of Limiting Critical Power Ratio (FLCPR) in the core. The FLCPR is defined for each fuel assembly in the core as:

FLCPR

=

MCPRLimit Fuel Assembly Minimum Critical Power Ratio where:

MCPRLimit

=

MCPR operating limit defined in Section 3.0 The MFLPD thermal limit ratio is the most limiting (maximum) value of the Fraction of Limiting Power Density (FLPD) in the core. The FLPD is defined for each six inch axial segment of each fuel rod in the core as:

FLPD

=

Peak kW/ft power generated in a fuel rod segment LHGRLimit where:

LHGRLimit

=

LHGR operating limit defined in Section 4.0

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 57 FIGURE 5-1 Licensed Regions of Operating Dome Pressure versus Core Power

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 58 TABLE 5-1 Pressure Dependent Operating Flexibility Options Equipment In/Out of Service Table #

Main Turbine Bypass System Operable EOC-RPT System Operable Main Turbine Pressure Regulator System Status High Pressure Feedwater Heaters In Service High Worth Scram Rods In Service Yes Yes/No TLCO 3.3.13.a or b Yes Yes/No 5-2 No Yes/No TLCO 3.3.13.a or b Yes Yes/No Reduced-Pressure Flexibility Option Not Licensed Yes/No Yes/No TLCO 3.3.13.c Yes Yes/No Yes/No Yes/No TLCO 3.3.13.a or b No Yes/No TABLE 5-2 MFLCPR and MFLPD Limits versus Operating Pressure Regions Operating Pressure Region Max Allowable Thermal Limit Ratio MFLCPR Limit MFLPD Limit I

1.000 1.000 II 0.977 0.985 III 0.954 0.912

Plant Hatch Core Operating Limits Report Unit 2 Cycle 27 Non-Proprietary Information Version 1 59 tabcount 6.

tablecount figcount 6.

figurecount

6.0 REFERENCES

1. Global Nuclear Fuel Report NEDE-24011-P-A-30, "General Electric Standard Application for Reactor Fuel (GESTAR II)," April 2020, and the US Supplement, NEDE-24011-P-A-30-US, April 2020.
2. Global Nuclear Fuel Report NEDC-33270P, "GNF2 Advantage Generic Compliance with NEDE-24011-P-A (GESTAR II)," Revision 11, August 2020.
3. Global Nuclear Fuel Report 003N5312, "Technical Evaluation to Support Introduction of GNF3 Lead Use Assemblies (LUAs) in Hatch Nuclear Plant, Unit 2," Revision 0, October 2016.
4. Global Nuclear Fuel Report NEDC-33879P, "GNF3 Generic Compliance with NEDE-24011-P-A (GESTAR II)," Revision 4, August 2020.
5. Southern Nuclear Operating Company Report NFD-H-20-236 "Hatch-2 Cycle 27 Reload Licensing Analysis Report," Version 1.0, November 2020.
6. Global Nuclear Fuel Report 006N3297, "Supplemental Reload Licensing Report for Hatch 2 Reload 26 Cycle 27," Revision 0, November 2020.
7. Global Nuclear Fuel Report 005N2010, "Fuel Bundle Information Report for Hatch 2 Reload 26 Cycle 27," Revision 0, October 2020.
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