Letter Sequence Approval |
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EPID:L-2023-TOP-0055, Submittal of Approved Terrapower, LLC, Topical Report: Principal Design Criteria for the Natrium Advanced Reactor (Approved, Closed) |
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MONTHYEARML23311A1392023-11-0606 November 2023
Terrapower, LLC, Transmittal of Topical Report, Radiological Release Consequences Methodology, Revision 0
Project stage: Request
ML23333A0702023-12-18018 December 2023
Completeness Determination for Terrapower, Llc. Radiological Release Consequences Methodology Topical Report, Revision 0
Project stage: Request
ML23333A0722023-12-18018 December 2023
NRC 898 - Completeness Determination for the Terrapower, Llc. Radiological Release Consequences Methodology Topical Report Revision 0
Project stage: Other
ML23333A0732023-12-18018 December 2023
Email - Completeness Determination for the Terrapower, Llc. Radiological Release Consequences Methodology Topical Report Revision 0
Project stage: Other
ML24043A0422024-02-12012 February 2024
Withholding Proprietary Information from Public Disclosure - Terrapower, LLC, Radiological Release Consequences Methodology Topical Report
Project stage: Other
ML24103A2242024-04-24024 April 2024
Terrapower, LLC - Audit Plan for TP-LIC-RPT-0005, Radiological Release Consequences Methodology Topical Report, Revision 0 (Cac/Epid No. 000431/L-2023-TOP-0055)
Project stage: Other
ML24283A0662024-10-0808 October 2024
Submittal of Approved Terrapower, LLC, Topical Report: Principal Design Criteria for the Natrium Advanced Reactor
Project stage: Request
ML24304B0342024-10-30030 October 2024
Transmittal of Terrapower Plume Exposure Pathway Emergency Planning Zone Methodology Topical Report, Nat 3056 Revision 3
Project stage: Request
ML25024A0452025-01-23023 January 2025
Letter - Terrapower, LLC - Summary Report on the Regulatory Audit of Topical Report, TP-LIC-RPT-0005, Radiological Release Consequences Methodology Topical Report, Revision 0 (EPID No. L-2023-Top-0055
Project stage: Other
ML25024A0432025-01-23023 January 2025
Public Enclosure - Terrapower, LLC - Summary Report on the Regulatory Audit of Topical Report, TP-LIC-RPT-0005, Radiological Release Consequences Methodology Topical Report, Revision 0
Project stage: Other
ML25057A2902025-01-31031 January 2025
Terrapower, LLC - Draft Safety Evaluation of Nat-9391,Radiological Release Consequences Methodology Topical Report, Revision 0
Project stage: Draft Approval
ML25106A2642025-05-13013 May 2025
Terrapower, LLC - Final Safety Evaluation of Topical Report NAT-9391, Radiological Release Consequences Methodology Topical Report, Rev 0
Project stage: Approval
ML25106A2672025-05-13013 May 2025
Public - Enclosure - Terrapower, LLC - Final Safety Evaluation of Topical Report NAT-9391, Radiological Release Consequences Methodology Topical Report, Rev 0
Project stage: Approval
ML24282A9472025-09-10010 September 2025
Transmittal-Topical Report Withholding Determination - Terrapower, LLC NAT-9391, Rev. 0, Radiological Release Consequences Methodology
Project stage: Other
ML24278A2812025-09-12012 September 2025
NRC Form 897: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC, NAT-9391, Radiological Release Consequences Methodology Topical Report, Rev. 0
Project stage: Other
ML25237A2182025-09-12012 September 2025
Email: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC, NAT-9391-A, Revision 0, Radiological Release Consequence Methodology
Project stage: Other
ML25237A2202025-09-12012 September 2025
NRC 897: Request for Withholding Proprietary Information from Public Disclosure - Terrapower, LLC, NAT-9391-A, Revision 0, Radiological Release Consequence Methodology
Project stage: Other
2024-04-24
[Table View] |
Text
May 13, 2025 George Wilson Vice President, Regulatory Affairs TerraPower, LLC 15800 Northup Way Bellevue, WA 98008
SUBJECT:
TERRAPOWER, LLC - FINAL SAFETY EVALUATION FOR NATRIUM TOPICAL REPORT NAT-9391, RADIOLOGICAL RELEASE CONSEQUENCES METHODOLOGY TOPICAL REPORT, REVISION 0 (EPID L-2023-TOP-0055)
Dear George Wilson:
By letter dated November 6, 2023, TerraPower, LLC (TerraPower) submitted Topical Report (TR), TP-LIC-RPT-0005, Radiological Release Consequences Methodology Topical Report, (Agencywide Documents Access and Management System (ADAMS) Accession No. ML23311A139) for the U.S.
Nuclear Regulatory Commission (NRC) staffs review which contains an overview and description of the models developed to evaluate the consequences of radiological release source terms for the proposed Natrium sodium fast reactor (SFR) nuclear power plant design. On December 18, 2023, the NRC staff found that the material presented in the TR provides technical information in sufficient detail for the NRC staff to conduct a detailed technical review (ML23333A070).
On April 24, 2024, the NRC staff transmitted an audit plan to TerraPower (ML24103A224). From May 7, 2024, through June 28, 2024, the NRC staff conducted an audit to gain a detailed understanding of the TR methodology and identify any additional information that required docketing to support the NRC staffs safety evaluation (SE) for the TR. The NRC staff issued the audit summary on January 23, 2025 (ML25024A041). On July 26, 2024, TerraPower submitted a revision to TP-LIC-RPT-0005, renumbered as NAT-9391, Revision 0 (ML24208A181) that addressed items discussed during the NRC staff audit and other minor editorial corrections.
The enclosed final SE is being provided to TerraPower, because the NRC staff has found NAT-9391, Revision 0, acceptable for referencing in licensing actions to the extent specified and under the limitations and conditions delineated in the SE. The final SE defines the basis for the NRC staffs acceptance of the TR.
The NRC staff requests that TerraPower submit to NRC staff an approved version of this TR within three 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 Roel Brusselmans at (301) 415-0829 or via email at Roel.Brusselmans@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
Pkg: ML25106A262 Letter: ML25106A264 Enclosure (Public): ML25106A267 (OUO-PROP)
Enclosure:
ML25106A265 OFFICE NRR/DANU/UTB2:TR NRR/DANU/UTB2:BC NRR/DANU/UAL1:PM NAME MHart CdeMessieres RBrusselmans DATE 4/3/2025 4/9/2025 4/10/2025 OFFICE NRR/DANU/UAL1:LA OGC - NLO NRR/DANU/UAL1:BC NAME DGreene NMertz JBorromeo DATE 4/21/2025 4/23/2025 5/13/2025