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MONTHYEARML24017A1162024-01-16016 January 2024
Terrapower, LLC, Transmittal of Radiological Source Term Methodology Report, Revision 1
Project stage: Request
ML24082A2622024-03-22022 March 2024
Transmittal of Terrapower, LLC Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Request
ML24107B0452024-04-22022 April 2024
NRC Form 898 - Completeness Determination for Terrapower, LLC Design Basis Accident Methodology for Events with Radiological Release, Revision 0 (L-2024-TOP-0009)
Project stage: Other
ML24107B0462024-04-22022 April 2024
Email - Completeness Determination for Terrapower, LLC Design Basis Accident Methodology for Events with Radiological Release, Revision 0 (L-2024-TOP-0009)
Project stage: Other
ML24197A1562024-07-15015 July 2024
Public - Terrapower, Lic - Audit Plan for Topical Report TP-LIC-RPT-0007, Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Other
ML24261B9442024-09-13013 September 2024
Terrapower, LLC, Transmittal of Radiological Source Term Methodology Report, NAT-9392 Revision 0
Project stage: Request
ML24267A2262024-09-24024 September 2024
Email: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC Topical Report, Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Other
ML24107B0602024-09-24024 September 2024
NRC Form 897: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC Topical Report, Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Other
ML24295A2022024-10-11011 October 2024
Transmittal of Terrapower, LLC Topical Report, Design Basis Accident Methodology for In-Vessel Events Without Radiological Release, NAT-9390, Revision 2
Project stage: Request
ML24354A1922024-12-19019 December 2024
Terrapower, LLC, Submittal of Approved Fuel and Control Assembly Qualification Topical Report
Project stage: Request
ML25063A2532025-04-16016 April 2025
Form 897: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC Topical Report, NAT-9394 Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Other
ML25063A2522025-04-23023 April 2025
Email: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC Topical Report, NAT-9394 Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Other
ML25157A1182025-06-0606 June 2025
Np Enclosure - Terrapower, LLC - Summary Report on the Regulatory Audit of Topical Report, TP-LIC-RPT-0007, Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Other
ML25157A1172025-06-0606 June 2025
Letter - Terrapower, LLC - Summary Report on the Regulatory Audit of Topical Report, TP-LIC-RPT-0007, Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Other
ML25212A0542025-08-19019 August 2025
Np Enclosure Terrapower, Llc. - Final Safety Evaluation of Topical Report Nat-9394, Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Approval
ML25189A0852025-08-19019 August 2025
Terrapower, Llc. - Final Safety Evaluation of Topical Report Nat-9394, Design Basis Accident Methodology for Events with Radiological Release, Revision 0
Project stage: Approval
ML25253A0392025-09-10010 September 2025
NRC 897 - Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC, NAT-9394-A, Revision 0, DBA with Release
Project stage: Other
2024-09-13
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 June 6, 2025 George Wilson Senior Vice President, Regulatory Affairs TerraPower, LLC 15800 Northup Way Bellevue, WA 98008
SUBJECT:
TERRAPOWER, LLC -
SUMMARY
REPORT ON THE REGULATORY AUDIT OF TOPICAL REPORT, TP-LIC-RPT-0007, DESIGN BASIS ACCIDENT METHODOLOGY FOR EVENTS WITH RADIOLOGICAL RELEASE, REVISION 0 (EPID NO. L-2024-TOP-0009)
Dear George Wilson:
By letter dated March 22, 2024, TerraPower, LLC (TerraPower) submitted topical report (TR)
TP-LIC-RPT-0007, Design Basis Accident Methodology for Events with Radiological Release,"
Revision 0 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML24082A262) to the U.S. Nuclear Regulatory Commission (NRC) staff. The TR provides evaluation models (EMs) developed for the Natrium reactor to evaluate design basis accidents (DBAs) with the potential for radiological release. On April 22, 2024, the NRC staff found that the material presented in the TR provides technical information in sufficient detail to enable the NRC staff to conduct a detailed technical review (ML24107B043).
Enclosed is a summary report on the regulatory audit conducted by the NRC staff in connection with its ongoing review of the TR. The audit followed the plan dated July 15, 2024 (ML24197A156).
The audit summary report does not make any licensing conclusions or findings, but it is part of the administrative record of the NRC staffs review of the TR and may provide information supporting the NRC staffs safety evaluation. No requests for additional information were identified as part of the audit and there are no open items resulting from the audit. However, by letter dated February 28, 2025, TerraPower submitted a revision to the TR, renumbered as NAT-9394, Design Basis Accident Methodology for Events with Radiological Release, Revision 0 (ML25063A329) to address the results of the audit.
If you have any questions regarding this matter, please contact me at (301) 415-5301 or via email at Stephanie.Devlin-Gill@nrc.gov.
Sincerely,
/RA/
Stephanie Devlin-Gill, Senior Project Manager Advanced Reactor Licensing Branch 1 Division of Advanced Reactors and Non-Power Production and Utilization Facilities Office of Nuclear Reactor Regulation Project No.: 99902100
Enclosure:
As stated cc: TerraPower Natrium via GovDelivery
Package: ML25157A115 Letter: ML25157A117 Public
Enclosure:
ML25157A118 Non-Public
Enclosure:
ML25157A116 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UAL1:LA NRR/DANU/UTB2:BC NAME SDevlin-Gill DGreene CdeMessieres DATE 05/28/2025 06/03/2025 05/21/2025 OFFICE NRR/DANU/UAL1:BC NAME JBorromeo DATE 06/05/2025