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Letter Sequence Approval |
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CAC:000431, (Open) EPID:L-2023-TOP-0024, Final Safety Evaluation of Metallic Material Qualification for the Kairos Power Fluoride Salt-Cooled High-Temperature Reactor (KP-TR-013) (Approved, Closed) |
Initiation
- Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request, Request
- Acceptance
Results
- Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval, Approval
Other: ML20280A970, ML20343A224, ML21147A547, ML21160A221, ML21218A045, ML22018A300, ML23097A123, ML23097A127, ML24103A224, ML24212A030, ML24262A066, ML24297A138, ML25017A130, ML25023A086, ML25028A267, ML25161A172
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MONTHYEARML21263A2362020-08-0505 August 2020
Safety Evaluation by the Office of Nuclear Reactor Regulation Regarding the Terrapower, LLC Quality Assurance Topical Report
Project stage: Approval
ML20280A9702020-10-21021 October 2020
Terrapower - Acceptance Topical Report Quality Assurance Program Description
Project stage: Other
ML20294A3372020-11-10010 November 2020
Letter and Final Safety Evaluation for Kairos Power, LLC Topical Report-KP Fhr Risk-Informed Performance-Based Licensing Basis Development Methodology (Revision 1) (EPID No. L-2019-TOP-0009/CAC No. 000431)
Project stage: Approval
ML20343A2242020-12-0808 December 2020
Verification Letter of the Approval Version of Kairos Power LLC Topical Report KP-TR-O09-NP, - KP-FHR Risk-Informed Performance-Based Licensing Basis Development Methodology - (Revision 1) (CAC No. 000431)
Project stage: Other
ML21005A0152020-12-23023 December 2020
Revision to Terrapower, LLC - Quality Assurance Topical Report
Project stage: Request
ML21021A3642021-01-21021 January 2021
Enclosure 2: Presentation Materials About Construction Permit Application for the KP-FHR (Non-Proprietary)
Project stage: Request
ML21071A0822021-03-0808 March 2021
Kairos Power, LLC - Quality Assurance Program for the Kairos Power Flouride Salt-Cooled High Temperature Reactor Topical Report (Revision 1)
Project stage: Request
ML21071A0832021-03-31031 March 2021
Kairos Power, LLC - KP-TR-007-NP, Quality Assurance Program for the Kairos Power Flouride Salt-Cooled High Temperature Reactor Topical Report, Revision 1 (Non-Proprietary)
Project stage: Request
ML21105A5182021-04-15015 April 2021
Kairos Power LLC, Quality Assurance Program for the Flouride Salt-Cooled High Temperature Reactor Topical Report (Revision 2)
Project stage: Request
ML21117A0482021-04-26026 April 2021
Quality Assurance Program for the Kairos Power Flouride Salt Cooled High Temperature Reactor Topical Report, Revision 3
Project stage: Request
ML21117A0472021-04-26026 April 2021
Kairos Power LLC, Quality Assurance Program for the Flouride Salt-Cooled High Temperature Reactor Topical Report(Revision 3)
Project stage: Request
ML21105A5192021-04-30030 April 2021
Kairos Power LLC, Quality Assurance Program for the Flouride Salt-Cooled High Temperature Reactor Topical Report Revision 2
Project stage: Request
ML21148A2362021-05-28028 May 2021
Response to Request for Additional Information on NRCs Assessment of the Quality Assurance Program Description for Terrapower, LLCs Quality Assurance Topical Report
Project stage: Response to RAI
ML21147A5472021-06-0909 June 2021
Kairos Power Hermes Test Reactor Psotulated Events Audit Plan
Project stage: Other
ML21160A2212021-06-22022 June 2021
Letter SE Kairos Fuel Performance Methodology Topical
Project stage: Other
ML21183A2002021-07-0202 July 2021
Revised Response to Request for Additional Information on NRCs Assessment of the Quality Assurance Program Description for Terrapower, LLCs Quality Assurance Topical Report
Project stage: Response to RAI
ML21218A0452021-08-17017 August 2021
Kairos Hermes PSAR Pre-Submittal Audit Plan - Rev. 3
Project stage: Other
ML21194A4392021-08-20020 August 2021
Draft Kairos Flibe Thermophisical Properties Audit Plan 6 30 21
Project stage: Draft Other
ML21308A5982021-11-16016 November 2021
Letter - Kairos Power, LLC - Safety Evaluation for Kairos Power, LLC Topical Report KP-TR-007-NP, Quality Assurance Program
Project stage: Approval
ML21308A5972021-11-16016 November 2021
Enclosure - Safety Evaluation for Kairos Power LLC Topical Report KP-TR-007-NP, Quality Assurance Program for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor, Revision 3
Project stage: Approval
ML22018A3002022-01-21021 January 2022
Letter - NRC Feedback on Terrapower Advanced SER QAPD
Project stage: Other
ML22018A1612022-01-31031 January 2022
Kairos Power LLC, Kp& 8208;TR& 8208;004& 8208;NP, Regulatory Analysis for the Kairos Power Fluoride Salt-Cooled High Temperature Reactor, Rev. 4
Project stage: Request
ML22024A4852022-02-0808 February 2022
OEDO-21-00545 -Safety Evaluation of the Kairos Power LLC Topical Report KP-TR-012-P, Revision 1, KP-FHR Mechanistic Source Term Methodology
Project stage: Request
ML22088A2312022-03-28028 March 2022
KP-TR-012-NP, Revision 3, KP-FHR Mechanistic Source Term Methodology Topical Report
Project stage: Request
ML22112A1332022-04-22022 April 2022
Kairos Power, LLC, Safety Evaluation for KP-TR-012 KP-FHR Mechanistic Source Term Methodology Topical Report, Revision 3 (EPID L-2020-TOP-0051/CAC 000431)
Project stage: Approval
ML22136A0892022-05-26026 May 2022
Safety Evaluation for Kairos Regulatory Analysis Topical Report Kp TR-004, Revision 4
Project stage: Approval
ML22186A2132022-07-0505 July 2022
Kairos Power LLC, Fuel Qualification Methodology for Fluoride Salt-Cooled High Temperature Reactor (KP-FHR), Revision 2
Project stage: Request
ML22216A1792022-07-29029 July 2022
Submission of X Energy, LLC (X-energy) TRISO-X Pebble Fuel Qualification Methodology
Project stage: Request
ML22265A2182022-09-21021 September 2022
Withdrawal of X Energy, LLC (X-energy) Xe-100 Topical Report: TRISO-X Pebble Fuel Qualification Methodology, Revisions 1 and 2
Project stage: Request
ML22266A2862022-09-23023 September 2022
Submittal of Revised Terrapower, LLC Quality Assurance Topical Report, Revision 14
Project stage: Request
ML22318A2362022-11-10010 November 2022
Submission of X Energy, LLC (X-energy) Xe-100 Licensing White Paper Probabilistic Risk Assessment Technical Adequacy Approach
Project stage: Request
ML23024A2632023-02-0808 February 2023
Staff Response to Advisory Committee on Reactor Safeguards Letter on Safety Evaluation of the Kairos TR
Project stage: Request
ML23048A3262023-03-0202 March 2023
Final Safety Evaluation for Kairos Fuel Qualification TR
Project stage: Approval
ML22327A2012023-03-0909 March 2023
X Energy LLC - Safety Evaluation of XE-100 Topical Report TRISO-X Pebble Fuel Qualification Methodology Revision No. 3 (EPID No. L-2021-TOP-0011) - Redacted
Project stage: Approval
ML22327A1982023-03-0909 March 2023
Cover Letter – X Energy, LLC - Safety Evaluation of Xe-100 Topical Report, TRISO-X Pebble Fuel Qualification Methodology, Revision No. 3
Project stage: Approval
ML23062A7282023-03-13013 March 2023
Redacted Final Safety Evaluation of Metallic Material Qualification for the Kairos Power Fluoride Salt-Cooled High-Temperature Reactor (KP-TR-013)
Project stage: Approval
ML23062A7332023-03-14014 March 2023
Redacted Final Safety Evaluation of Graphite Material Qualification for the Kairos Power Fluoride Salt-Cooled High-Temperature Reactor (KP-TR-014)
Project stage: Approval
ML23080A0452023-03-20020 March 2023
Submittal of Terrapower Plume Exposure Pathway Emergency Planning Zone Methodology Topical Report
Project stage: Request
ML24325A3772023-03-20020 March 2023
Revised Draft SE Natrium EPZ TR
Project stage: Draft Approval
ML23116A1832023-05-0909 May 2023
Enclosure - Safety Evaluation of Quality Assurance Topical Report TP-QA-PD-0001, Terrapower QA Program Description, Revisions 13 and 14
Project stage: Approval
ML23116A1782023-05-0909 May 2023
Letter - Safety Evaluation of Quality Assurance Topical Report TP-QA-PD-0001, Terrapower QA Program Description, Revisions 13 and 14
Project stage: Approval
ML23097A1272023-05-31031 May 2023
Enclosure - X Energy, LLC – NRC Feedback Regarding Xe-100 Licensing White Paper Probabilistic Risk Assessment Technical Adequacy Approach (EPID L-2022-LRO-0150/CAC 000431)
Project stage: Other
ML23097A1232023-05-31031 May 2023
Letter - X Energy, LLC - U.S. NRC Observations Regarding Xe-100 White Paper - Probabilistic Risk Assessment Technical Adequacy Approach
Project stage: Other
ML23158A2032023-06-12012 June 2023
Email Transmitting NRC Form 898 for Terrapower, LLC TR Plume Exposure Pathway Emergency Planning Zone
Project stage: Other
ML23158A2002023-06-12012 June 2023
NRC 898 -Topical Report Completeness Determination for Terrapower, LLC Plume Exposure Pathway Emergency Planning Zone Methodology Topical Report
Project stage: Other
2022-01-21
[Table View] |
Text
March 28, 2025 George Wilson Senior Vice President, Regulatory Affairs TerraPower, LLC 15800 Northup Way Bellevue, WA 98008
SUBJECT:
TERRAPOWER, LLC - FINAL SAFETY EVALUATION OF NATRIUM TOPICAL REPORT NAT-3056, PLUME EXPOSURE PATHWAY EMERGENCY PLANNING ZONE SIZING METHODOLOGY REVISION 3 (EPID L-2023-TOP- 0024)
Dear George Wilson:
By letter dated March 20, 2023 (Agencywide Documents Access and Management System (ADAMS)
Accession No. ML23080A045), TerraPower, LLC (TerraPower) submitted a Topical Report (TR) NAT-3056, Plume Exposure Pathway Emergency Planning Zone Sizing Methodology, Revision 0, for the U.S. Nuclear Regulatory Commission (NRC) staffs review. The TR provides a methodology describing how the Plume Exposure Pathway (PEP) Emergency Planning Zone (EPZ) sizing is determined. The TR follows the guidance in NRC Regulatory Guide (RG) 1.242, Performance-Based Emergency Preparedness for Small Modular Reactors, Non-Light-Water Reactors, and Non-Power Production or Utilization Facilities, Revision 0 (ML23226A036).
By email dated June 12, 2023 (ML23158A203), the NRC staff informed TerraPower that the TR provided sufficient information for the NRC staff to conduct a detailed technical review. On August 11, 2023, the NRC staff transmitted an audit plan to TerraPower (ML23199A317) and subsequently conducted an audit of materials related to the TR from August 17, 2023, to September 15, 2023. By letter dated November 16, 2023, Revision 1 of the TR (ML23321A036) was submitted by TerraPower that addressed items discussed in the audit. On September 2, 2024, the NRC staff issued the draft safety evaluation (SE) to TerraPower (ML24242A101). In a letter dated October 29, 2024, TerraPower submitted Revision 2 of the TR (ML24303A147), which clarified information discussed during the Advisory Committee for Reactor Safeguards (ACRS) subcommittee (Design-Centered Review: TerraPower) meeting held on September 19, 2024 (ML24296A058).
The audit summary was issued on January 8, 2024 (ML24008A057). To provide further insight into the description of Plume Exposure Pathway EPZ sizing methodology, TerraPower submitted Revision 3 of the TR (ML24304B034) by letter dated October 30, 2024.
The enclosed final SE is provided to TerraPower because the NRC staff found the TR 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 submit 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 Mallecia Sutton at (301) 415-0673 or via email at Mallecia.Sutton@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: ML25076A653 Letter: ML25076A657
Enclosure:
ML25065A250 OFFICE NRR/DANU/UAL1:PM NRR/DANU/UTB2:TR NRR/DANU/UAL1:LA NAME MSutton MHart DGreene DATE 3 / 17/2025 3/18/2025 3/18/2025 OFFICE OGC NRR/DANU/UTB2:BC NRR/DANU/UAL1:BC NAME NMertz CdeMessieres JBorromeo DATE 3/10/2025 3/12/2025 3/28/2025