ML23222A184

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Summary of the April 25, 2023, Partially Closed Meeting with Terrapower, LLC, Use of Safety Analysis (SAS) Code
ML23222A184
Person / Time
Site: 99902100
Issue date: 09/11/2023
From: Mallecia Sutton
NRC/NRR/DANU/UAL1
To: Jessup W
NRC/NRR/DANU/UAL1
Banks C
References
EPID L-2021-LRM-0071
Download: ML23222A184 (1)


Text

MEMORANDUM TO:

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

Mallecia Sutton, Senior Project Manager 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 APRIL 25, 2023, PARTIALLY CLOSED PRE-APPLICATION MEETING WITH TERRAPOWER, LLC TO DISCUSS THE USE OF THE SAFETY ANALYSIS CODE SYSTEM (EPID NO. L-2021-LRM-0071)

Meeting Information:

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

Accession No.: ML23109A339 Applicant Presentation Slides ADAMS Accession No.: ML23104A079 Meeting Summary:

The U.S. Nuclear Regulatory Commission (NRC) staff conducted the meeting in accordance with NRC Management Directive 3.5, Attendance at NRC Staff-Sponsored Meetings (ADAMS Accession No. ML21180A271). Key aspects of the meeting included the following:

On April 25, 2023, the U.S. Nuclear Regulatory Commission (NRC) staff held a partially closed public meeting with TerraPower, LLC (TerraPower) where TerraPower provided the NRC staff with an overview of the SAS4A/SASSYS-1 safety analysis code system (SAS) as its used in the design of the Natrium sodium-cooled reactor. Participants included representatives from TerraPower, Argonne National Lab, and General Electric Hitachi.

The NRC staff began the public meeting with an introduction and explained that a portion of the meeting would be closed to the public to discuss proprietary information.

September 11, 2023 Signed by Sutton, Mallec on 09/11/23

W. Jessup During the public portion of the meeting, TerraPower discussed the background and history of the code, code documentation, structures, models and correlation, software quality assurance, and code benchmarks.

During the closed portion of the meeting, TerraPower representatives presented on topics including software quality pedigree and commercial grade dedication, code assessment base, and code capabilities and documentation for the Natrium design.

TerraPower also discussed the discretization of the Natrium reactor systems and provided sample results for representative transients.

The NRC staff and TerraPower representatives discussed the next steps for future interactions regarding the Natrium reactor design.

CONTACT:

Mallecia Sutton, NRR/DANU (301) 415-0673

Enclosure:

List of Meeting Attendee

W. Jessup

SUBJECT:

SUMMARY

OF THE APRIL 25, 2023, PARTIALLY CLOSED PRE-APPLICATION MEETING WITH TERRAPOWER, LLC TO DISCUSS THE USE OF THE SAFETY ANALYSIS CODE SYSTEM (EPID NO. L-2021-LRM-0071)

DATED: SEPTEMBER 11, 2023 DISTRIBUTION:

PUBLIC RidsNrrDanuUal1 Resource RidsNrrDanu Resource SDevlin-Gill, NRR RBrusselmans, NRR CBanks, NRR MSutton, NRR WJessup, NRR ADAMS Accession Number: [ML#########]

NRC-001 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UAL1:PM NRR/DANU/UAL1:BC NRR/DANU/UAL1:PM NAME CBanks MSutton WJessup MSutton DATE 8/14/2023 8/14/2023 8/30/2023 9/11/2023 OFFICIAL RECORD COPY

Enclosure List of Meeting Attendees Partially Closed Pre-Application Meeting with TerraPower, LLC To Discuss the Use of the SAS Code April 25, 2023 Name Organization Mallecia Sutton U.S. Nuclear Regulatory Commission (NRC)

Reed Anzalone NRC Alex Siwy NRC Michelle Hart NRC Andrew Proffitt NRC Courtney Banks NRC Candance de Messieres NRC Hahn Phan NRC Jason Schaperow NRC Hossein Esmaili NRC Ryan Sprengel TerraPower LLC, (TerraPower)

Mike Montecalvo TerraPower Hugh Luo TerraPower Michal Pawluczyk TerraPower Jong Chang TerraPower Matthew Presson TerraPower Nick Kellenberger TerraPower Nicholas Powell TerraPower Brian Johnson TerraPower Emily Young TerraPower Dan OGrady Argonne National Lab (ANL)

Kacie Brunett ANL Tyler Sumner ANL Acacia Brunett ANL Lisa Schichlein General Electric Hitachi