ML23223A210

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Summary of Partially Closed Meeting with Terrapower, LLC, Mechanistic Source Term and Radiological Release Consequences
ML23223A210
Person / Time
Site: 99902100
Issue date: 09/06/2023
From: Mallecia Sutton
NRC/NRR/DANU/UAL1
To: Jessup W
NRC/NRR/DANU/UAL1
Banks C
References
EPID L-2021-LRM-0071
Download: ML23223A210 (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 26, 2023, PARTIALLY CLOSED MEETING WITH TERRAPOWER, LLC TO DISCUSS MECHANISTIC SOURCE TERM AND RADIOLOGICAL RELEASE CONSEQUENCES (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.: ML23109A335 Applicant Presentation Slides ADAMS Accession No.: ML23104A093 August 25, 2023 Signed by Sutton, Mallec on 08/25/23

W. Jessup 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). A summary of the meeting is included below.

On April 26, 2023, the U.S. Nuclear Regulatory Commission (NRC) staff held a partially closed public meeting with TerraPower, LLC (TerraPower) to provide the NRC staff with an overview of the mechanistic source term and radiological release consequences for the Natrium design. Participants included representatives from TerraPower, the Department of Energy, General Electric Hitachi and Bechtel.

During the public portion of the meeting, TerraPower provided an update on the Natrium source term methods development. TerraPower presented methodologies for the Licensing Basis Event (LBE) and Design Basis Accident (DBA) radiological consequences for the Natrium design. TerraPower also provided updates on source term analysis, radionuclide hazard identification and screening, and the source term Phenomena Identification and Ranking Tables (PIRT) process.

During the closed portion of the meeting, TerraPower representatives provided additional detail on the PIRT development and source term analysis for the LBE and DBA radiological consequence methodologies for the Natrium design.

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 Attendees

W. Jessup

SUBJECT:

SUMMARY

OF APRIL 26, 2023, PARTIALLY CLOSED PRE-APPLICATION MEETING WITH TERRAPOWER, LLC TO DISCUSS MECHANISTIC SOURCE TERM AND RADIOLOGICAL RELEASE CONSEQUENCES (EPID NO. L-2021-LRM-0071) DATED: AUGUST 25, 2023 DISTRIBUTION:

PUBLIC RidsNrrDanuUal1 Resource RidsNrrDanu Resource MSutton, NRR WJessup, NRR ADAMS Accession Number: ML23223A210 NRR-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 8/24/2023 8/25/2023 OFFICIAL RECORD COPY

Enclosure List of Meeting Attendees Partially Closed Pre-Application Meeting with TerraPower, LLC to Discuss Mechanistic Source Term and Radiological Release Consequences April 26, 2023 Name Organization Mallecia Sutton U.S. Nuclear Regulatory Commission (NRC)

Reed Anzalone NRC Alex Siwy NRC Andrew Proffitt NRC Candace de Messieres NRC David Garmon NRC Hossein Esmaili NRC Jason Schaperow NRC Michael Salay NRC Trey Hathaway NRC Michele Hart NRC Ryan Sprengel TerraPower, LLC (TerraPower)

Mike Montecalvo TerraPower Brian Johnson TerraPower Chris Forrest TerraPower Hugh Luo TerraPower Ian Gifford TerraPower Jong Chang TerraPower Jun Wang TerraPower Kevin Cass TerraPower Leslie Holden TerraPower Marc Hotchkiss TerraPower Matthew Presson TerraPower Nick Kellenberger TerraPower Nik Krainchich TerraPower Seok Hun Kang TerraPower Nathan Howard Department of Energy Lisa Schichlein General Electric Hitachi (GEH)

Shane Gardner GEH Eric Pearson GEH Tim Enfinger GEH Joanne Morris GEH Maria Pfeffer GEH Steve Kline Bechtel