Text

Cycle 31 Core Operating Limits Report Version 1
	ML22056A074
Person / Time
Site:	Hatch
Issue date:	02/25/2022
From:	Gayheart C; Southern Nuclear Operating Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
Shared Package
ML22056A073	List: NL-22-0129, Cycle 31 Core Operating Limits Report Version 1;
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	NL-22-0129
	Download: ML22056A074 (59)
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Cheryl A. Gayheart 3535 Colonnade Parkway Regulatory Affairs Director Birmingham, AL 35243 205 992 5316 cagayhea@southernco.com Enclosure 1 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.

February 25, 2022 Docket No.: 50-321 NL-22-0129 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555-0001 Edwin I. Hatch Nuclear Plant - Unit 1 Cycle 31 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 1 Cycle 31.

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 Ryan Joyce at 205.992.6468.

Respectfully submitted, Cheryl A. Gayheart Regulatory Affairs Director CAG/tle

U. S. Nuclear Regulatory Commission NL-22-0129 Page 2

Enclosures:

1. HNP Unit 1 Cycle 31 Core Operating Limits Report Version 1 PROPRIETARY INFORMATION and Global Nuclear Fuel - Americas Affidavit

2. HNP Unit 1 Cycle 31 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 1 Cycle 31 Core Operating Limits Report Version 1 Enclosure 2 HNP Unit 1 Cycle 31 Core Operating Limits Report Version 1 NON-PROPRIETARY INFORMATION

Non-Proprietary Information SOUTHERN NUCLEAR OPERATING COMPANY EDWIN I. HATCH NUCLEAR PLANT Unit 1 Cycle 31 CORE OPERATING LIMITS REPORT Version 1

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 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 43 5.0 Operating Pressure Limits 52 6.0 References 56 2

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 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 MCPR Limit (MCPRP) Operating Flexibility Options (for Core Power 28% of Rated) 17 3-3 Power-Dependent MCPR Limit Multiplier (KP) Operating 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 44 4-2 Flow-Dependent LHGR Limit Multiplier (LHGRFACF) Operating Flexibility Options 45 5-1 Pressure-Dependent Operating Flexibility Options 55 5-2 MFLCPR and MFLPD Limits versus Operating Pressure Regions 55 3

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 FIGURES Figure No. Title Page 2-1 APLHGR Limits versus Average Planar Exposure 13 3-1 Flow-Dependent MCPR Limit (MCPRF) versus Core Flow 20 3-2A Power-Dependent MCPR Limit (MCPRP) versus Core Power 21 3-2B Power-Dependent MCPR Limit (MCPRP) versus Core Power (Main Turbine Bypass System Inoperable) 22 3-3A Power-Dependent MCPR Limit Multiplier (KP) versus Core Power 23 3-3B Power-Dependent MCPR Limit Multiplier (KP) versus Core Power (Main Turbine Pressure Regulator System in TLCO 3.3.13.c) 24 3-4A-1 Rated-Power TLO MCPR Limits versus Average SCRAM Time 25 3-4A-2 Rated-Power TLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable) 26 3-4A-3 Rated-Power TLO MCPR Limits versus Average SCRAM Time (EOC-RPT System Inoperable) 27 3-4A-4 Rated-Power TLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable &

EOC-RPT System Inoperable) 28 3-4A-5 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service) 29 3-4A-6 Rated-Power TLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

Main Turbine Bypass System Inoperable) 30 4

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 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) 31 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) 32 3-4B-1 Rated-Power SLO MCPR Limits versus Average SCRAM Time 33 3-4B-2 Rated-Power SLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable) 34 3-4B-3 Rated-Power SLO MCPR Limits versus Average SCRAM Time (EOC-RPT System Inoperable) 35 3-4B-4 Rated-Power SLO MCPR Limits versus Average SCRAM Time (Main Turbine Bypass System Inoperable &

EOC-RPT System Inoperable) 36 3-4B-5 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service) 37 3-4B-6 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

Main Turbine Bypass System Inoperable) 38 3-4B-7 Rated-Power SLO MCPR Limits versus Average SCRAM Time (High Worth Scram Rods In Service &

EOC-RPT System Inoperable) 39 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) 40 5

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 Figure No. Title Page 3-5A High Worth Scram Rod Set - A1 Configuration 41 3-5B High Worth Scram Rod Set - A2 Configuration 42 4-1A GNF2 Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow 46 4-1B GNF2 Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow (Main Turbine Bypass System Inoperable) 47 4-1C GNF3 Flow-Dependent LHGR Limit Multiplier (LHGRFACF) versus Core Flow 48 4-2 GNF2 & GNF3 Power-Dependent LHGR Limit Multiplier (LHGRFACP) versus Core Power 49 4-3A GNF2 Rated-Power LHGR Limit versus Peak Pellet Exposure 50 4-3B GNF3 Rated-Power LHGR Limit versus Peak Pellet Exposure 51 5-1 Licensed Regions of Operating Dome Pressure versus Core Power 54 6

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 tabcount 1. tablecount figcount 1. figurecount

1.0 INTRODUCTION

The Core Operating Limits Report (COLR) for Plant Hatch Unit 1 Cycle 31 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 contains GNF2 and GNF3 fuel types (Reference 2 and Reference 3). Results from the associated reload analyses for the fuel in Unit 1 Cycle 31 are documented in References 4 through 6.

The GNF2 limits in this report are applicable to the IronClad Lead Test Assembly (Reference 7 and Reference 8).

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 that 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, 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.

7

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 TABLE 1-1 System Operability Requirements System Operability Requirement Main Turbine Bypass System Operable At least two bypass valves must be operable (Technical Specification 3.7.7) 8

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 TABLE 1-2 Equipment Requirements Equipment Requirement The maximum achievable core flow on the highest Recirculation Flow Control System licensed rod line must be limited to less than 107% of rated core flow When operating at greater than 55% core thermal Turbine Power/Load Unbalance Trip Logic power, the turbine Power/Load Unbalance (PLU) trip logic must be functional The Oscillation Power Range Monitor (OPRM)

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

9

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 TABLE 1-3 Equipment Condition In/Out of Service Limitations Condition Limitation

Core power must be 2000 MWth Single-Loop Operation (SLO)

Core flow must be 55% of rated Main Turbine Bypass System Inoperable OR Dome pressure must be within +/- 10 psi of nominal, as defined in Figure 5-1 Main Turbine Pressure Regulator System in TLCO 3.3.13.c

The core must be operating with a set of four (4) valid High Worth Scram Rods (as defined in High Worth Scram Rods In Service Table 1-2)

The Main Turbine Pressure Regulator System must be in TLCO 3.3.13.a or b Main Turbine Pressure Regulator High Worth Scram Rods In Service System in TLCO 3.3.13.c core operating limits are NOT applicable 10

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 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 - 6000 MWd/ST Second Middle of Cycle MOC2 EOR - 3500 MWd/ST Exposure Projected exposure at end of rated power with all control rods out, EOR End of Rated Exposure rated core flow, and rated feedwater temperature EOC End of Cycle Exposure Exposure at cycle shutdown 11

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 tabcount 2. tablecount figcount 2. figurecount 2.0 APLHGR OPERATING LIMITS (Technical Specification 3.2.1)

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.

12

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 15.0 Average GNF2 14.0 Planar APLHGR Exposure Limit 13.0 (GWd/ST) (kW/ft) 12.0 0.00 13.78 17.15 13.78 11.0 GNF3 60.78 6.87 APLHGR Limit (kW/ft) 63.50 5.50 10.0 GNF2 Average GNF3 9.0 Planar APLHGR Exposure Limit 8.0 (GWd/ST) (kW/ft) 0.00 14.36 7.0 9.07 13.78 6.0 21.22 13.01 40.82 10.75 5.0 57.60 8.00 63.50 6.00 4.0 0.0 10.0 20.0 30.0 40.0 50.0 60.0 70.0 Average Planar Exposure (GWd/ST)

FIGURE 2-1 APLHGR Limits versus Average Planar Exposure 13

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 tabcount 3. tablecount figcount 3. figurecount 3.0 MCPR OPERATING LIMITS (Technical Specification 3.2.2)

The MCPR operating limit (OLMCPR) for each licensed equipment in or out of service operating flexibility option 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. Each individual credited HWSR must meet the equipment requirements defined in Table 1-2 to be considered valid for thermal operating limit credit.

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.

14

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 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 is linearly dependent on . If has not been determined, Option A limits must be used.

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

ave B

= 0, OR , whichever is greater.

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

1

º2

<< N >>

B = + 1.65* * << n 1 >>

<< N >>

<< i >>

¬ i=1 1/4 where: = 0.822 sec (mean scram time to notch 36 used in the transient analysis).

= 0.018 sec (standard deviation of ).

N1 = 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.

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

n N i i ave = i =1 n

N i =1 i

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

15

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 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:

HWSR - B

= 0, OR , whichever is greater.

A - B 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).

16

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 TABLE 3-1 Cycle Specific MCPR Safety Limit Two Loop Operation Single Loop Operation 1.08 1.11 TABLE 3-2 Power-Dependent MCPR Limit (MCPRP) Operating Flexibility Options (for Core Power 28% of Rated)

Equipment In/Out of Service Main Turbine EOC-RPT Main Turbine High Worth Figure #

Bypass System System Pressure Regulator Scram Rods Operable Operable System Status In Service TLCO 3.3.13.a Yes/No or b Yes Yes/No 3-2A TLCO 3.3.13.c N/A

TLCO 3.3.13.a Yes/No or b No Yes/No 3-2B TLCO 3.3.13.c N/A *

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.

17

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 TABLE 3-3 Power-Dependent MCPR Limit Multiplier (KP) Operating Flexibility Options (for Core Power > 28% of Rated)

Equipment In/Out of Service Main Turbine EOC-RPT Main Turbine High Worth Figure #

Bypass System System Pressure Regulator Scram Rods Operable Operable System Status In Service TLCO 3.3.13.a Yes/No 3-3A or b Yes/No Yes/No TLCO 3.3.13.c N/A

3-3B

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.

18

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 TABLE 3-4 Rated-Power OLMCPR Operating Flexibility Options Figure #

Equipment In/Out of Service 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 EOC-RPT AND 3-4A-4 3-4B-4 System Inoperable System Inoperable Main Turbine Pressure Regulator System in TLCO 3.3.13.c 3-4A-1 3-4B-1 Main Turbine Bypass 3-4A-2 3-4B-2 System Inoperable EOC-RPT 3-4A-3 3-4B-3 Main Turbine System Inoperable Pressure Regulator AND System in TLCO 3.3.13.c Main Turbine Bypass System Inoperable AND 3-4A-4 3-4B-4 EOC-RPT System Inoperable High Worth Scram Rods In Service 3-4A-5 3-4B-5 Main Turbine Bypass 3-4A-6 3-4B-6 System Inoperable EOC-RPT 3-4A-7 3-4B-7 System Inoperable High Worth Scram Rods AND In Service Main Turbine Bypass System Inoperable AND 3-4A-8 3-4B-8 EOC-RPT System Inoperable 19

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 1.60 TLO 1.50 Flow -Dependent MCPR Lim it (MCPRF) 1.40 1.30 1.20 1.10 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100 .0 110 .0 Core Flow (% of Rated)

Flow (% of Rated) MCPRF (TLO) 30.0 1.53 87.0 1.20 110.0 1.20 MCPRF (SLO) = MCPRF (TLO) + 0.03 FIGURE 3-1 Flow-Dependent MCPR Limit (MCPRF) versus Core Flow 20

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 FIGURE 3-2 figurecount 2.80 TLO 2.70 Pow er-Dependent MCPR Lim it (MCPRP )

2.60 2.50 Flow 60%

2.40 Flow < 60%

2.30 24.0 28.0 Core Power (% of Rated)

Flow (% of Rated) Power (% of Rated) MCPRP (TLO) 24.0 2.42 60.0 28.0 2.37 24.0 2.37

< 60.0 28.0 2.37 MCPRP(SLO) = MCPRP(TLO) + 0.03 FIGURE 3-2A Power-Dependent MCPR Limit (MCPRP) versus Core Power 21

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 2.80 Flow 60% TLO 2.70 Pow er-Dependent MCPR Lim it (MCPRP )

2.60 Flow < 60%

2.50 2.40 2.30 24.0 28.0 Core Power (% of Rated)

Flow (% of Rated) Power (% of Rated) MCPRP (TLO) 24.0 2.74 60.0 28.0 2.74 24.0 2.66

< 60.0 28.0 2.47 MCPRP(SLO) = MCPRP(TLO) + 0.03 FIGURE 3-2B Power-Dependent MCPR Limit (MCPRP) versus Core Power (Main Turbine Bypass System Inoperable) 22

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 FIGURE 3-3 figurecount 1.500 1.400 Pow er-Dependent MCPR Lim it Multiplier (KP) 1.300 1.200 1.100 1.000 28.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 55 28 Core Power (% of Rated)

Power (% of Rated) 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 FIGURE 3-3A Power-Dependent MCPR Limit Multiplier (KP) versus Core Power 23

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 1.500 1.400 Pow er-Dependent MCPR Lim it Multiplier (KP) 1.300 1.200 1.100 1.000 28.0 30.0 40.0 50.0 60.0 70.0 80.0 90.0 100.0 28 85 Core Power (% of Rated)

Power (% of Rated) 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 FIGURE 3-3B Power-Dependent MCPR Limit Multiplier (KP) versus Core Power (Main Turbine Pressure Regulator System in TLCO 3.3.13.c) 24

Plant Hatch Core Operating Limits Report Unit 1 Cycle 31 Non-Proprietary Information Version 1 FIGURE 3-4 figurecount FIGURE 3-4A figurecount 1.75 1.75 BOC - MOC1 1.70 1.70 MOC1 - MOC2 MOC2 - EOC 1.65 1.65 1.60 1.60 1.55 1.55 MCPR Lim it MCPR Lim it 1.50 1.50 1.45 1.45 1.40 1.40 1.35 1.35 1.30 1.30 0.0 0.2 0.4 0.6 0.8 1.0 Rated OLMCPR(TLO)

Exposure Range

= 0.0 = 1.0 BOC - MOC1 1.31 1.45 MOC1 - MOC2 1.36 1.50 MOC2 - EOC 1.36 1.50 FIGURE 3-4A-1 Rated-Power TLO MCPR Limits versus Average SCRAM Time 25