ML25043A242
| ML25043A242 | |
| Person / Time | |
|---|---|
| Issue date: | 02/12/2025 |
| From: | Sosa B Office of Nuclear Reactor Regulation |
| To: | Michael Wentzel Office of Nuclear Reactor Regulation |
| References | |
| Download: ML25043A242 (1) | |
Text
February 12, 2025 MEMORANDUM TO:
Michael Wentzel, Chief Advanced Reactor Policy Branch Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation FROM:
Belkys Sosa /RA/
Project Manager, Advanced Reactor Policy Branch Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF DECEMBER 17, 2024, SEISMIC SCENARIO FOR EPZ DETERMINATION TABLETOP, CLOSED MEETING On December 17, 2024, the U.S. Nuclear Regulatory Commission (NRC) staff held a closed meeting with the Nuclear Energy Institute (NEI), Jensen Hughes, TerraPower, LLC., and Southwest Research Institute (SwRI) on NEIs White Paper on selection of a seismic scenario for an Emergency Planning Zone (EPZ) boundary determination (ML24187A096).
The closed meeting notice is available in the NRCs Agencywide Documents Access and Management System (ADAMS) at Accession No. ML24341A209, and the presentation slides are available under Accession No. ML25043A204. The Enclosure to this summary provides the attendees for the meeting as captured by Microsoft Teams.
During the meeting the NRC staff discussed their observations and comments on the NEI White Paper that was provided by email dated November 14, 2024 (ML24347A147). The NRC staff and the participants from SwRI, under contract to the NRC, requested more detailed information regarding how the approach described in the White Paper can be implemented at the construction permit stage.
The meeting focused on clarifying whether the application of the approach in the NEI White Paper results in a single scenario failure or if there are multiple failure scenarios.
CONTACT: Belkys Sosa 301-415-3357
M. Wentzel 2
The NEI explained that the proprietary data presented during the tabletop demonstration of the approach described in the NEI White Paper regarding seismic event selection for the sizing of the EPZ, represents the TerraPower proprietary Natrium Fragility Data (ML25043A173).
TerraPower provided dose consequences for the full-core source term generated in NAT-6959.
Participants discussed the generation of radiological consequences, methods and assumptions used to implement the approach described in the NEI White Paper. The general methodology used to determine radiological consequences for the Natrium project are described in the Radiological Release Consequences Methodology Topical Report, NAT-5026. A non-proprietary version of that topical report is available in ADAMS ML23311A139. During the tabletop demonstration, participants discussed the Licensing Basis Event (LBE) and EPZ radiological consequence analyses and how the WinMACCS code was used to determine consequences.
NRC staff appreciates the active participation and feedback provided by NEI and industry representatives during the tabletop demonstration and explained that additional comments and questions on the NEI White Paper would be consolidated and submitted by the staff in writing to NEI.
Please direct any inquires to Belkys Sosa at 301-415-3357 or via email at belkys.sosa@nrc.gov.
Enclosure:
Attendance List
M. Wentzel 4
SUBJECT:
SUMMARY
OF DECEMBER 17, 2024, SEISMIC SCENARIO FOR EPZ DETERMINATION TABLETOP, CLOSED MEETING DISTRIBUTION:
PUBLIC RidsNrrDanu Resource RidsNrrDanuUarp Resource MWentzel, NRR BSosa, NRR ADAMS Accession Number: ML25043A242 OFFICE NRR/DANU/UARP/PM NRR/DANU/UARP/BC NAME BSosa MWentzel DATE 02/12/2025 02/12/2025 OFFICIAL RECORD COPY
SEISMIC SCENARIO FOR EPZ DETERMINATION TABLETOP Closed Meeting Attendance List*
December 17, 2024 Enclosure Name of the attendee Affiliation Paul Amico Jensen Hughes Kati Austgen NEI Laurel Bauer NRC John Biersdorf TerraPower Matt Bindeman TerraPower Robert Budnitz SwRI Nilesh Chokshi SwRI Chris Courtenay TerraPower Biswajit Dasgupta SwRI Chris Forrest TerraPower Brian Johnson TerraPower Denise McGovern NRC Sunwoo Park NRC Jose Pires NRC Marie Pohida NRC Richard Rivera NRC Robert Roche-Rivera NRC Belkys Sosa NRC John Segala NRC John Stamatakos SwRI Ramachandran Subbaratnam NRC Kristin Ulmer SwRI Ravindra SwRI Weijun Wang NRC Thomas Weaver NRC
- Attendance list based on Microsoft Teams Participant list.