ML24012A075

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Meeting Summary - TerraPower- Design Basis Accident Transient Methodology - In-vessel Without Releases
ML24012A075
Person / Time
Site: 99902100
Issue date: 01/03/2024
From: Brusselmans R
NRC/NRR/DANU/UAL1
To: Jessup W
NRC/NRR/DANU/UAL1
References
EPID L-2021-LRM-0071
Download: ML24012A075 (1)


Text

January 3, 2024 MEMORANDUM TO:

William T. Jessup, Chief Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation FROM:

Roel A. Brusselmans, Project Manager /RA/

Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation

SUBJECT:

SUMMARY

OF THE JULY 12, 2023, PARTIALLY CLOSED PUBLIC MEETING WITH TERRAPOWER, LLC, TO DISCUSS IN-VESSEL DESIGN BASIS ACCIDENT WITHOUT RELEASE METHODOLOGIES FOR THE NATRIUM DESIGN (EPID NO. L-2021-LRM-0071)

Meeting Information:

Applicant: TerraPower, LLC (TerraPower)

Project No.: 99902100 Public Meeting Notice Agencywide Documents Access and Management System (ADAMS)

Accession No.: ML23193A838 Applicant Presentation Slides: ML23181A189 Meeting Attendees: See the enclosure for a list of meeting attendees.

CONTACT:

Roel A. Brusselmans, NRR/DANU (301) 415-0829

W. Jessup 2

Meeting Summary:

On July 12, 2023, the U.S. Nuclear Regulatory Commission (NRC) staff held a partially closed public meeting with TerraPower to provide the NRC staff with an overview of the methodologies used by TerraPower to evaluate in-vessel design basis accidents (DBAs) without releases for the Natrium design. This meeting was held in anticipation of a forthcoming topical report from TerraPower regarding the same subject. Participants included representatives from TerraPower, General Electric Hitachi, Bechtel, Argonne National Lab, and members of the general public. The NRC staff conducted the meeting in accordance with NRC Management Directive 3.5, Attendance at NRC Staff-Sponsored Meetings (ML21180A271).

The NRC staff began the meeting with an introduction and explained that a portion of the meeting would be closed to the public to discuss proprietary information. During the public portion of the meeting, TerraPower gave an overview of the Natrium design including a discussion of project goals, plant overview, and graphics explaining the design. TerraPower described the DBA selection process and the related dose acceptance criteria in Title 10 of the Code of Federal Regulations (10 CFR) Section 50.34, Contents of applications; technical information. TerraPower also described its radiological release methodology, including how the methodology aligns with the Evaluation Model Development and Application Process guidance in Regulatory Guide 1.203, Transient and Accident Analysis Methods.

During the closed portion of the meeting, TerraPower provided additional details regarding the in-vessel DBA without release methodology for the Natrium design. Specifically, TerraPower described plant modeling, reactor core modeling, reactor protection system modeling, and uncertainty quantification modeling. TerraPower and the NRC staff discussed the next steps for future interactions regarding the Natrium reactor design.

No regulatory decisions were made as a result of this meeting.

Enclosure:

List of Meeting Attendees cc: TerraPower Natrium via GovDelivery

W. Jessup 3

SUBJECT:

SUMMARY

OF THE JULY 12, 2023, PARTIALLY CLOSED PUBLIC MEETING WITH TERRAPOWER, LLC, TO DISCUSS IN-VESSEL DESIGN BASIS ACCIDENT WITHOUT RELEASE METHODOLOGY FOR THE NATRIUM DESIGN (EPID NO. L-2021-LRM-0071)

DATED: JANUARY 3, 2024.

DISTRIBUTION:

PUBLIC RidsNrrDanuUal1 Resource RidsNrrDanu Resource MSutton, NRR SDevlin-Gill, NRR CBanks, NRR RBrusselmans, NRR WJessup, NRR RAnzalone, NRR DGreene, NRR MHart, NRR ASiwy, NRR CdeMessieres, NRR JSchaperow, NRR RAnzalone, NRR ADAMS Accession Number: [ML24012A075]

NRR-001 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UAL1:PM NRR/DANU/UAL1:LA NRR/DANU/UAL1:BC NAME RBrusselmans MSutton DGreene WJessup DATE 10/23/2023 10/26/2023 11/2/2023 12/22/2023 OFFICE NRR/DANU/UAL1:PM NAME RBrusselmans DATE 1/3/2024 OFFICIAL RECORD COPY

Enclosure List of Meeting Attendees

SUMMARY

OF THE JULY 12, 2023, PARTIALLY CLOSED PUBLIC MEETING WITH TERRAPOWER, LLC, TO DISCUSS IN-VESSEL DESIGN BASIS ACCIDENT WITHOUT RELEASE METHODOLOGIES FOR THE NATRIUM DESIGN (EPID NO. L-2021-LRM-0071)

July 12, 2023 Name Organization Mallecia Sutton U.S. Nuclear Regulatory Commission (NRC)

Michelle Hart NRC Roel Brusselmans NRC Andrew Proffitt NRC Bill Jessup NRC Alex Siwy NRC Candace de Messieres NRC Jason Schaperow NRC Reed Anzalone NRC Ryan Sprengel TerraPower, LLC (TerraPower)

Matthew Presson TerraPower Hugh Luo TerraPower Brian Johnson TerraPower Emily Young TerraPower Richard Schultz TerraPower Ian Gifford TerraPower Jong Chang TerraPower Michal Pawluczyk TerraPower Mike Johnson TerraPower Moonkyu Hwang TerraPower Zach Mayfield TerraPower Chris Forrest TerraPower Son Pham TerraPower Nicholas Powell TerraPower Joshua Chen TerraPower Vince Mousseau TerraPower Antoine Margeride TerraPower Dana Miranda TerraPower Selim Kuran TerraPower Joo Seok Baek TerraPower Seok Hun Kang TerraPower Maria Pfeffer General Electric (GE) Hitachi Scott Pfeffer GE Hitachi Steve Kline Bechtel Acacia Brunett Argonne National Lab (ANL)

Dan OGrady ANL Tyler Summer ANL