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November 13, 2024, Hatch Pre-Submittal Public Meeting Slides (Southern Co.)
	ML24313A105
Person / Time
Site:	Hatch
Issue date:	11/13/2024
From:	; Southern Nuclear Operating Co
To:	Harris B; NRC/NRR/DNRL/NLRP
References
	Download: ML24313A105 (1)
	v • d • e

Pre-Application Meeting November 13, 2024 Hatch Nuclear Plant Subsequent License Renewal

Hatch Background Hatch SLR Project Team General Topics Safety Portion of the Subsequent License Renewal Application Scoping and Screening Aging Management Programs Time-Limited Aging Analyses Topics of Interest Closing Remarks Questions Agenda Application information is considered preliminary and subject to change

3 Hatch Background

Located near Baxley, GA, Hatch is jointly owned by Georgia Power, Oglethorpe Power Corporation, Municipal Electrical Authority of Georgia, and Dalton Utilities, and operated by SNC, the licensee and applicant

The Hatch site is approximately 2,244 acres, located in Appling and Toombs County, GA

Unit 1 and Unit 2 are General Electric Type 4 BWRs

Hatch Background

Original license renewal application approved in 2002

Current license expiration dates: 8/6/2034 Unit 1, 6/13/2038 Unit 2

Based on pre-GALL

IP 71003 Phase IV completed May 2023

Entered PEO in 2014 (U1) and 2018 (U2)

Latest NEI 14-12 AMP effectiveness review completed first quarter 2023

Core Power History

2436 MWt, Initial

2763 MWt, Power Uprate (1998)

2804 MWt, Power Uprate (2003)

Unit 1 and Unit 2 are on a 24-month refueling cycle 4

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Hatch SLR Project Team

SNC Team:

Brad Deen - Engineering Manager

Brad Creek - Electrical Lead

Adam Wilcher - Civil Lead

Michael Todd - Mechanical Lead DeLisa Pournaras - Safety Licensing Lead

Supplemental Team:

ENERCON - Jeff Head, Safety Lead Steve Franzone - Consulting Engineer

Vendors

ENERCON, General Electric, Transware, Structural Integrity

Speakers 5

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General Topics

Submittal Schedule

ePortal Folder Structure

Operating Experience

Application of Lessons Learned

Scoping and Screening

Incorporation of Draft GALL-SLR guidance 6

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General Topics

Submittal Schedule

- Second Quarter of 2025 - on track

ePortal Folder Structure

- Folder for each AMP and AMR

- Added folders for general references

- Will add to the current structure as needed during audits

Operating Experience

- Latest available keywords utilized (~200 total)

- Initial search covered February 1, 2013 to January 31, 2023, and an update through September 30, 2024

- No new aging effects identified 7

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General Topics

Application of Lessons Learned

- Senior, LR/SLR experienced engineers in key positions

- Review and incorporation of industry LR operating experience including implementation

- Incorporated lessons learned from industry and ENERCON SLRA experience

- Review and incorporation of RAIs associated with approved SLRAs

- Monitoring on-going applicant reviews 8

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Approach to Application - Scoping and Screening

Performed in accordance with 10 CFR 54.4 and 10 CFR 54.21(a)

- NEI 17-01 Rev. 0, NUREG-2192 Draft Rev. 1

10 CFR 54.4 (a)(2) scoping consistent with NEI 95-10 Rev. 6, Appendix F

- Walkdowns performed using Spaces Approach

- Preventive Option approach to Non-Safety SSCs Not Directly Connected to Safety Related SSCs 9

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Approach to Application - Aging Management Programs

Consistency with NUREG-2191, Draft Rev. 1

AMRs (SLRA Section 3)

Consistent (A through E notes)

No new aging effects identified through plant operating experience reviews

AMPs (Appendix B) - 48 Total Review of precedence set by other applicants and current BWR SLRA reviews Includes aging management effectiveness review of current LR AMPs

Recent SLR docketed correspondence addressed

Separate section in each AMP basis document summarizes how RAIs/RCIs/Supplements were addressed 10

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Approach to Application - Aging Management Programs 11 New AMPs Neutron Fluence Monitoring ASME Code Class 1 Small-Bore Piping Electrical Cable Connections Reactor Head Closure Stud Bolting External Surfaces Monitoring of Mechanical Components High Voltage Insulators Thermal Aging Embrittlement of CASS Inspection of Internal Surfaces in Miscellaneous Piping and Ducting Components Vessel ID Attachment Welds Compressed Air Monitoring Internal Coatings/Linings for In-Scope Piping Lube Oil One-Time Inspection Electrical Insulation for Inaccessible Instrument and Control Cables BWR Penetrations Selective Leaching Fuse Holders AMPs with Exceptions Water Chemistry Fire Water Reactor Head Closure Stud Bolting Buried and Underground Piping and Tanks BWR Vessel ID Attachment Welds Masonry Walls Fire Protection Structures Monitoring

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Approach to Application - Time-Limited Aging Analyses

Fluence Methodology

- RAMA Fluence Methodology

- Neutron transport followed the guidance of Regulatory Guide 1.190, Calculational and Dosimetry Methods for Determining Pressure Vessel Neutron Fluence

- Methodology has been generically approved for calculations of exposure of the reactor pressure vessel (RPV) beltline and for BWR core shroud and top guide components

- Exposure Projections

Reports

- RPV Fluence

- Reactor Internals

- Methods report 12

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Approach to Application - Time-Limited Aging Analyses

Environmentally-Assisted Fatigue

- NUREG/CR-6260 locations

Plant-Specific TLAAs

- Fatigue of Cranes

- Erosion, Corrosion, and Material Fatigue of HPCI

- Main Steam Flow Restrictors

- Erosion, Corrosion, and Material Fatigue for Recirc Pumps

- Corrosion Allowance Calculations

24 Total TLAAs 13

14 Topics of Interest Buried and Underground Piping and Tanks Fire Water Application information is considered preliminary and subject to change

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Hatch Buried Pipe and Tanks AMP

Introduction

- Hatch is considering necessary preventive actions of the GALL-SLR XI.M41 AMP; however, since the site was not originally designed with a Cathodic Protection (CP) system, we are currently evaluating the need for a CP system

Construction

- Unit 1 (1974), Unit 2 (1978)

- Did not contain CP in original design

- Material consists of Carbon Steel (CS), Stainless Steel (SS), Copper Alloy, Ductile Iron, and Gray Cast Iron

- Coatings consists of Coal-Tar Enamel, Wraps, and Asphaltic 15

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Hatch Buried Pipe and Tanks AMP

Current Program

- Ensures the integrity of buried pipes by monitoring their condition, conducting preventative maintenance, and identifying and addressing potential issues before they impact the intended function Regular inspections, testing, and analysis of the pipes and tanks Replacement of in-scope Carbon Steel (CS) piping with Stainless-Steel (SS)

Plans for additional in-scope piping to be replaced Holiday testing prior to replacing backfill 16

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Hatch Buried Pipe and Tanks Aging Management Program

Operating Experience (OE)

- Review of license renewal in-scope and not in-scope piping

- Recent identified leaks were on Fire Protection piping

Soil Characteristics

- Mild to relatively Non-Corrosive (2010, 2014)

- Recent sampling (2022, 2024)

- Additional analysis (2024)

Pipe-to-soil potential Resistivity 17

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Hatch Buried Pipe and Tanks AMP

Summary

- By leveraging the success of the current asset management plan under the guidance of NEI 09-14, and with the adoption of GALL-SLR XI.M41 AMP with exceptions and/or enhancements, Hatch will provide reasonable assurance that the program will continue to manage aging effects so that the intended function(s) of components within the scope of the program will be maintained 18

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Fire Water AMP

Introduction

- Hatch currently manages the aging effects of sprinklers under the XI.M27 AMP by using a performance-based methodology and reliance on the effectiveness of the corrective action program

- Hatch is evaluating taking the following exceptions to the XI.M27 AMP:

Element 4 - Utilizing performance-based methodology outlined in NFPA 805 and EPRI 106756. Some frequencies for sprinkler inspections are less frequent than those prescribed in NUREG-2191

Element 7 - Use corrective action program to determine extent of condition and follow on actions 19

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SLRA Scheduling and Closing Remarks

SNC is on track to submit the Hatch SLR Application in 2Q 2025

SNC will submit a high-quality application which will support efficient staff reviews

- Highly knowledgeable team with significant SLR experience including vendors

- Participation in industry working groups and meetings

- Industry and 3rd party peer reviews of SLRA

- Monitoring on-going applicant reviews

- Reviews of recent applicant RAIs, RCIs, and supplements

Hatchs SLRA will meet NRC requirements, incorporate past industry practices and precedent where appropriate, while leveraging new efficiency opportunities where feasible.

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