ML25189A103

Pre-Application Meeting

ML25189A103
Person / Time
Site:	Hatch
Issue date:	07/07/2025
From:	Southern Nuclear Operating Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML25189A101	List: ML25189A102 ML25189A103 ML25189A104 NL-25-0270, July 17, 2025 Pre-Application Meeting - Affidavit
References
NL-25-0270
Download: ML25189A103 (1)

Text

Edwin I. Hatch Nuclear Plant - Units 1 & 2 Pre-Application Meeting to NL-25-0270 SNC Pre-application meeting July 17, 2025 (Public, non-proprietary)

A Southern Nuclear Combined License Amendment Request {LAR) for Extended Power Uprate {EPU) and Maximum Extended Load Line Limit Analysis Plus

{MELLLA+) for the Edwin I. Hatch Nuclear Plant Unit 1 and Unit 2 July 17, 2025

Agenda

• Purpose

• Need for a Combined LAR

• Schedule

• Precedents

• Guidance

• Documentation

• Licensing Strategy 2

PURPOSE EPU To Meet Increasing Power Demands in Georgia with Reliable Clean Energy:

Proposed increased licensed power level from 2804 MWth of 2960 MWt, which is an increase of 5.6% from CLTP or 121.5% of the OLTP.

MELLLA+

To Improve Operating Flexibility at Extended Power Uprate Levels:

Allow operations in the MELLLA+ domain to provide maximum operations flexibility. At 121.5% OLTP, MELLLA+

will allow a core flow window range similar to the currently licensed MELLLA domain.

Combined LAR to Support Efficient Licensing Strategy To Gain Efficiency in the Development. Review. and Implementation of the LAR:

APPROVED EPU 25 20 a..

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• Proposed Hatch EPU EPU Data from Approved Applications For Power Uprates I NRC.gov 3

Need for Combined LAR Strategy for EPU and MELLLA+

Separate LARs Challenges:

• MELLLA+ & EPU overlaps lead to inefficient duplicated technical reviews if submitted sequentially.

• If submitted for parallel review, linked submittals will complicate the technical review and lead to inefficiencies.

Need for Review Efficiency:

• Essential for meeting schedule demands aligned with power needs and fuel fabrication lead time.

Combined LAR Benefits:

• Streamlines NRC resource use and supports similar future industry submissions.

• Minimizes operator impact by preventing loss of operational flexibility and reducing reactivity management maneuvers upon EPU implementation.

• Simplifies site implementation of physical mods and procedure updates, especially in areas affected by both EPU and MELLLA+.

Criteria 2 Separate LARS Review Efficiency Lower Complexity Lower for sequential Operator Higher Impact Site Implementation More complex Combined LAR Higher Higher Lower Simpler 4

Combined LAR Allows Reduced Reactivity Maneuvers 120 100 I

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• ******Additional Reactivity Maneuvers w/o MEllllA+

-- EPU with 1M ELL LA+

100 200 300 400 500 600 700 5

SCHEDULE Hatch Subsequent License Renewal: Estimated Decision 2nd Quarter 2026 Hatch EPU/MELLLA+ LAR: Estimated Submittal 2nd Quarter 2027 Hatch EPU/MELLLA+ LAR: Requested NRC Approval 2nd Quarter 2028 Expected Power Ascension:

o Unit 2-1 st Quarter 2029 o Unit 1 -1 st Quarter 2030 6

Power Uprate Licensing Precedents Hatch Power Uprate

Background:

o 1995 Stretch Power Uprate (SPU): increase of 5% CL TP, 105.0% OL TP o

1998 Extended Power Uprate (EPU) increase of 8% CLTP, 113.4% OLTP o

2003 Measurement Uncertainty Recapture Uprate (MUR) 1.5% of CL TP, 115.1 % OL TP o

Proposed 2027 EPU 5.6% CLTP, 121.5% OLTP (retaining MUR at the proposed EPU power level)

Peach Bottom: 1994 SPU (5% CLTP); 2002 MUR (1.6% CLTP); 2014 EPU (12.4% CLTP);

2017 MELLLA+; 2017 MUR (1.66% CLTP)

Browns Ferry: 2017 EPU (14.3% CLTP); 2019 MELLLA+

Brunswick: 2002 EPU (15% CLTP); 2018 MELLLA+

7

GUIDANCE NRC Review Standard RS-001 (2003)

LIC-112 Power Uprate Process GE Nuclear Energy, "Constant Pressure Power Uprate," NEDC-33004P-A, Revision 4, July 2003 GE Hitachi Nuclear Energy, "General Electric Boiling Water Reactor Maximum Extended Load Line Limit Analysis Plus," NEDC-33006P-A, Revision 3, June 2009 GE Nuclear Energy, "Generic Guidelines and Evaluations for General Electric Boiling Water Reactor Thermal Power Optimization," NEDC-32938P-A, Revision 2, May 2003 GE Hitachi, "Boiling Water Reactor Detect and Suppress Solution-Confirmation Density,"

NEDC-33075P-A, Revision 8, November 2013 NEI 08-10 Roadmap for Power Uprate Program Development NEI 06-02 License Amendment Request Guidelines 8

CHANGESTOTHEPLANT Steam Dryer Replacement Power Range Neutron Monitoring System Modifications High Pressure Turbine Generator Upgrades Balance-of-Plant System and Component Upgrades 9

DOCUMENTATION GEH Combined Safety Analysis Report*

Operating License/ Technical Specifications Changes FSAR Changes Grid Stability Assessment Risk Assessment Environmental Assessment

• as discussed during closed meeting June 26, 2025 (ADAMS Accession No. ML25153A482) 10

STRATEGY

• Capture lessons learned from precedent EPU and MELLLA+ LARs, approved topical reports

• Use industry peer input for consistency

• Continue NRC engagements to support a 2027 submittal and an efficient review

• Utilize audits for confirmatory analyses, areas of significance

• Leverage NRC Power Uprate review efficiency strategy 11

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Edwin I. Hatch Nuclear Plant - Units 1 & 2 July 17, 2025 Pre-Application Meeting to NL-25-0270 GE Replacement Steam Dryer presentation redacted (Public, non-proprietary)