Letter Sequence Approval |
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Results
Other: ML23214A199, ML23292A274, ML23292A277, ML23292A278, ML23300A126, ML24032A159, ML24067A069, ML24127A055, ML24232A223, ML24232A227, ML24267A247, ML24267A254, ML25217A472, ML25217A473, ML25217A477, ML25217A478
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MONTHYEARML23214A1992023-08-0202 August 2023
Updated Kemmerer Power Station Unit 1 Construction Permit Application Anticipated Submittal Date
Project stage: Other
ML23223A2352023-08-11011 August 2023
Transmittal of Terrapower, LLC Topical Report, Radiological Source Term Methodology Report, Revision 0
Project stage: Request
PMNS20231070, Pre-Application Meeting with Terrapower to Discuss Feedback on Their Radiological Source Term Methodology Topical Report for Their Natrium Design2023-09-28028 September 2023
Pre-Application Meeting with Terrapower to Discuss Feedback on Their Radiological Source Term Methodology Topical Report for Their Natrium Design
Project stage: Meeting
ML23297A0582023-10-24024 October 2023
Summary of Partially Closed Meeting with Terrapower, LLC to Discuss the Radiological Source Term Methodology Topical Report
Project stage: Meeting
ML23300A1262023-10-27027 October 2023
Email - (External_Sender) Radiological Source Term Topical Report - Follow Up Information
Project stage: Other
ML23292A2782023-11-14014 November 2023
Enclosure - Completeness Determination Terrapower, LLC, Radiological Source Term Methodology Topical Report, Revision 0 (L-2023-TOP-0046)
Project stage: Other
ML23292A2742023-11-14014 November 2023
NRC 898 - L-2023-TOP-0046
Project stage: Other
ML23292A2772023-11-15015 November 2023
Email - Completeness Determination Terrapower, LLC Radiological Source Term Methodology Topical Report, Revision 0 (L-2023-TOP-0046)
Project stage: Other
ML24032A1592024-02-0202 February 2024
Withholding Proprietary Information from Public Disclosure – Terrapower, Llc Topical Report Radiological Source Term Methodology Report, Revision
Project stage: Other
ML24067A0692024-03-0707 March 2024
NRR E-mail Capture - NRC Staff Acknowledges Receipt of TP-LIC-RPT-0003, Radiological Source Term Methodology Report, Revision 1 (L-2023-TOP-0046)
Project stage: Other
ML24127A0552024-05-16016 May 2024
Terrapower, LLC - Audit Plan for Topical Report, Radiological Source Term Methodology Report, Revision 1 (EPID No. L-2023-TOP-0046) - Public:
Project stage: Other
ML24267A2542024-11-15015 November 2024
NRC Form 897: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC Topical Report, NAT-9392, Radiological Source Term Methodology Report, Revision 0
Project stage: Other
ML24267A2472024-11-18018 November 2024
Email: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC Topical Report-9392, Radiological Source Term Methodology Report, Revision 0
Project stage: Other
ML24232A2232025-01-0707 January 2025
Terrapower, LLC - Summary Report on the Regulatory Audit of Topical Report, Radiological Source Term Methodology Report, Revision 1
Project stage: Other
ML24232A2272025-01-0707 January 2025
Enclosure (Public) - Terrapower, LLC - Summary Report on the Regulatory Audit of Topical Report, Radiological Source Term Methodology Report, Revision 1
Project stage: Other
ML25024A1412025-02-20020 February 2025
Public - Terrapower, Llc. Draft Safety Evaluation of Nat 9392, Radiological Source Term Methodology Report, Revision 0
Project stage: Draft Approval
ML25063A3232025-06-16016 June 2025
Letter: Terrapower, LLC - Final Safety Evaluation of Nat-9392, Radiological Source Term Methodology Report, Revision 0
Project stage: Approval
ML25217A4782025-08-0808 August 2025
NRC Form 897: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC NAT-9392-A, Radiological Source Term Methodology, Revision 0
Project stage: Other
ML25217A4722025-08-15015 August 2025
Email: -A Verification of Terrapower, LLC, NAT-9392-A, Radiological Source Term Methodology, Revision 0
Project stage: Other
ML25217A4732025-08-15015 August 2025
NRC Form 896: -A Verification of Terrapower, LLC, NAT-9392-A, Radiological Source Term Methodology, Revision 0
Project stage: Other
ML25217A4772025-08-25025 August 2025
Email: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC, NAT-9392-A, Radiological Source Term Methodology, Revision 0
Project stage: Other
2024-11-18
[Table View] |
Text
June 16, 2025 George Wilson Senior Vice President, Regulatory Affairs TerraPower, LLC 15800 Northup Way Bellevue, WA 98008
SUBJECT:
TERRAPOWER, LLC - FINAL SAFETY EVALUATION OF NAT-9392, RADIOLOGICAL SOURCE TERM METHODOLOGY REPORT, REVISION 0 (EPID NO. L-2023-TOP-0046)
Dear George Wilson:
By letter dated August 11, 2023, TerraPower, LLC (TerraPower) submitted topical report (TR) TPLIC-RPT-0003 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML23223A234), which provides an overview and description of the model developed to evaluate mechanistic source terms for the proposed Natrium reactor design. By letter dated November 15, 2023, the U.S. Nuclear Regulatory Commission (NRC) staff concluded that Revision 0 of the TR was not sufficiently detailed to begin the NRC staffs detailed review. The NRC staff also informed TerraPower that it could supplement the submittal with the additional information (ML23292A269). By letter dated January 16, 2024, TerraPower supplied the supplemental information by submitting Revision 1 of the TR (ML24017A115) as a replacement to the information contained in Revision 0.
By letter dated May 16, 2024, the NRC staff transmitted an audit plan to TerraPower (ML24127A048) and subsequently conducted an audit of materials related to the TR from May 28, 2024, through August 13, 2024. The NRC staff issued the audit summary on January 7, 2025 (ML24232A223). By letter dated September 13, 2024, TerraPower submitted a further revision of the radiological source term methodology, which superseded the prior submissions, and renumbered the TR as NAT-9392, Revision 0 (ML24261B944).
The enclosed final safety evaluation (SE) is being provided to TerraPower, because the NRC staff has found NAT-9392, 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: ML25063A317 Letter: ML25063A323 Enclosure (Non-Public): ML25063A321 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UTB2 NRR/DANU/UAL1:LA NAME SDevlin-Gill MHart DGreene DATE 06/11/2025 06/11/2025 06/12/2025 OFFICE OGC NLO NRR/DANU/UTB2:BC NRR/DANU/UAL1:BC NAME NMertz CdeMessieres JBorromeo DATE 02/04/2025 01/16/2025 06/16/2025