Letter Sequence Approval |
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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
[Table View] |
Text
August 19, 2025 George Wilson Senior Vice President, Regulatory Affairs TerraPower, LLC 15800 Northup Way Bellevue, WA 98008
SUBJECT:
TERRAPOWER, LLC. - FINAL SAFETY EVALUATION OF TOPICAL REPORT NAT-9394, "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 submitted Topical Report (TR) TP-LIC-RPT-0007, Design Basis Accident Methodology for Events with Radiological Release, Revision 0 (ML24082A262), for the U.S. Nuclear Regulatory Commission (NRC) staffs review. On April 22, 2024, the NRC staff determined that the TR provided sufficient information for the NRC staff to begin its detailed technical review (ML24107B046). On July 15, 2024, the NRC staff transmitted an audit plan to TerraPower (ML24197A156) and subsequently conducted an audit of materials related to the TR from July 23, 2024, to January 29, 2025. The NRC staff issued the audit summary dated June 6, 2025 (ML25157A115). On February 28, 2025, TerraPower submitted a revision of the TR (ML25063A329), which was renumbered from TP-LIC-RPT-0007 to NAT-9394, Design Basis Accident Methodology for Events with Radiological Release, Revision 0, to clarify portions of the TR as discussed in the audit summary.
The enclosed final safety evaluation (SE) is being provided to TerraPower, because the NRC staff has found NAT-9394, Revision 0, acceptable for referencing in licensing actions to the extent specified and under the limitations and conditions delineated in the TR. The final SE defines the basis for the NRC staffs acceptance of the TR.
The NRC staff requests that TerraPower publish an approved version of this TR within 3 months of receipt of this letter. The approved version should incorporate this letter and the enclosed SE after the title page. The approved version should include a -A (designating approved) following the TR identification symbol.
If you have any questions, please contact Stephanie Devlin-Gill at (301) 415-5301 or via email at Stephanie.Devlin-Gill@nrc.gov.
Sincerely,
/RA/
Joshua Borromeo, Chief 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: ML25189A082 Letter: ML25189A085 Enclosure (Public): ML25212A054 Enclosure (Non-Public): ML25189A086 OFFICE NRR/DANU/UTB2:BC NRR/DANU/UAL1:PM NRR/DANU/UAL1:LA NAME CdeMessieres SDevlin-Gill DGreene DATE 06/25/2025 07/01/2025 07/02/2025 OFFICE NRR/DANU/UAL1:BC NAME JBorromeo DATE 07/31/2025