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The U.S. Nuclear Regulatory Commission is in the process of rescinding or revising guidance and policies posted on this webpage in accordance with Executive Order 14151 Ending Radical and Wasteful Government DEI Programs and Preferencing, and Executive Order 14168 Defending Women From Gender Ideology Extremism and Restoring Biological Truth to the Federal Government. In the interim, any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

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TRISO-X

Life cycle timeline showing current status, consisting of 6 various stages of status (Pre-Licensing, Licensing, Construction, Operating, Operating with Intent to Decommission, Decommissioning) with the current status (Licensing) shown with color background and white text, and the other available statuses are greyed out

Artist's rendering of proposed TRISO-X, Fuel Fabrication Facility, Oak Ridge, TN  

Location: Oak Ridge, TN
Licensee: TRISO-X, LLC
License Number: TBD
License Expires: TBD
Docket Number: 07007027

Facility Type: Uranium Fuel Fabrication
Facility Status: Licensing Application

Press Releases
Upcoming Meetings
Past Meetings

Triso-X Dashboards


Facility Information
Documentation License Application Announcements Automatic Email Distributions (ListServ) NRC Contacts
  • Safety Project Manager
    Matt Bartlett (301-415-7154)
    and Stephen Poy (301-415-7135)
  • Environmental Project Manager
    Jill Caverly (301-415-7674)
  • Public Affairs:
    800-368-5642 or 301-415-8200
 Related Information​
Review Process
Safety and Safeguards Review Environmental Review
Application (Completed)
  • Safety and safeguards report was received on April 12 and updated November 8, 2022
Acceptance (Completed)
  • NRC accepted the application for docketing on November 18, 2022
Develop Safety and Safeguards Evaluation Report (In Process)
  • Develop Requests for Additional Information
  • Develop Draft Safety Evaluation Repot
Construction at Risk: 		Application (Completed)
  • Environmental report was received September 26, 2022
Acceptance (Completed)
  • NRC accepted the application for docketing on November 18, 2022
Develop Environmental Impact Statement (In Process)

On this page:

Key Documents for the Environmental Review
 (Note: Documents applicable to safety, safeguards, and environmental are listed in both tables.)
Date Document Title
February 4, 2022 TRISO-X] Request for an Exemption Pursuant to 10 CFR 70.17 and 10 CFR 51.6 from the Requirements of 10 CFR 51.60(a) and 70.21(1) for Timing of Submittal of the Environmental Report for the TRISO-X Fuel Fabrication Facility
March 17, 2022 [NRC] Approval of TRISO-X Exemption Request to Support Submittal of the Safety and Safeguards Analysis Report in Advance of the Environmental Report
September 29, 2022 [TRISO-X] Fuel Fabrication Facility Environmental Report Submittal
November 18, 2022 [NRC] Acceptance of the TRISO-X, LLC License Application for a Fuel Fabrication Facility
December 16, 2022 [NRC] TRISO-X Environmental Impact Statement Notice of Intent Federal Register Notice (FR87 Pg. 77146-77148)
January 25, 2023 [NRC] - Official Transcript of Environmental Scoping Meeting for an Application for a Special Nuclear Material License for the TRISO-X Proposed Fuel Fabrication Facility at Oak Ridge, Pages 1-54
March 17, 2023 NRC] Request for Additional Information for the Application from TRISO_X, LLC for a Special Nuclear Material license for a Fuel Fabrication Facility in Oak Ridge, Tennessee
April 14, 2023 [TRISO-X] TRISO-X, LLC, Response to Requests for Additional Information on the Environmental Report for the Proposed Fuel Fabrication Facility
May 9, 2023 TRISO-X Fuel Fabrication Facility, Traffic Impact Analysis
November 20, 2023 [NRC] Request for Additional Information Part 2-1 for the Environmental Report for the Proposed Fuel Fabrication Facility
December 13, 2023 [NRC] Request for Additional Information Part 2-2 for the Environmental Report for the Proposed Fuel Fabrication Facility
December 20, 2023 [TRISO-X] Response to Request for Additional Information Part 2-1 for the TRISO-X Environmental Report and License Application
January 8, 2024 [NRC] Scoping Summary Report
March 4, 2024 [TRISO-X] Response to Request for Additional Information Part 2-2 for the TRISO-X Environmental Report and License Application
March 6, 2024 [NRC] Request for Additional Information Part 3 for the Application from TRISO-X, LLC for Special Nuclear Material License for Use at a Fuel Fabrication Facility
April 4, 2024 [TRISO-X] Response to Request for Additional Information Part 2 for the TRISO-X Environmental Report

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Key Documents for the Safety and Safeguards Review
 (Note: Documents applicable to safety, safeguards, and environmental are listed in both tables.)
Date Document Title
February 4, 2022 [TRISO-X] Request for an Exemption Pursuant to 10 CFR 70.17 and 10 CFR 51.6 from the Requirements of 10 CFR 51.60(a) and 70.21(1) for Timing of Submittal of the Environmental Report for the TRISO-X Fuel Fabrication Facility
March 17, 2022 [NRC] Approval of TRISO-X Exemption Request to Support Submittal of the Safety and Safeguards Analysis Report in Advance of the Environmental Report
April 4, 2022 [TRISO-X] Fuel Fabrication Facility License Application Submittal
August 9, 2022 [NRC] Requests for Supplemental Information for the Acceptance Review of the TRISO-X, LLC License Application for a Fuel Fabrication Facility
October 13, 2022 [NRC] Email Summary of Calls with TRISO-X to Discuss Draft Responses to the Requests for Supplemental Information
October 13, 2022 [TRISO-X] PART 1 – Response to Requests for Supplemental Information for the Acceptance Review of the TRISO-X Fuel Fabrication Facility License Application Submittal
November 4, 2022 [TRISO-X] Part 2 – License Application and ISA Summary Changes Associated with Responses to Requests for Supplemental Information for the Acceptance Review of the TRISO-X Fuel Fabrication Facility License Application Submittal
November 18, 2022 [NRC] Acceptance of the TRISO-X, LLC License Application for a Fuel Fabrication Facility
February 3, 2023 [NRC] Federal Register notice for the TRISO-X license application; opportunity to request a hearing and to petition for leave to intervene; order imposing procedures, docket number Docket No. 70–7027; NRC–2022–0209, (FR88 Pg. 7473-7478).
April 21, 2023 Request for an Exemption Pursuant to 10 CFR 73.5 from the Requirements of Specified Portions of 10 CFR 73.67(d) and (e) for Physical Security of the Proposed TRISO-X Fuel Fabrication Facility
May 23, 2023 Submittal of Revision 3 of the TRISO-X Facility Safeguards Information Plan
May 31, 2023 [NRC] Request for Additional Information of the TRISO-X, LLC License Application for a Fuel Fabrication Facility (Set 1): Programmatic RAIs for Human Factors, Quality Assurance, and Structural
July 27, 2023 [NRC] Request for Additional Information of the TRISO-X, LLC License Application for a Fuel Fabrication Facility (Set 2): Chp 1, 2, Emergency Plan
July 28, 2023 [TRISO-X] Response to Request for Additional Information (Set 1) for the TRISO-X, LLC License Application for a Fuel Fabrication Facility - [Management Measures/Quality Assurance (5), Human Factors (1), and Structural (2)]
August 18, 2023 [TRISO-X] Supplemental Response to Request for Additional Information Question 3-2 (Set 1) for the TRISO-X License Application [Structural]
August 25, 2023 [TRISO-X] Response to Request for Additional Information (Set 2) for the TRISO-X License Application [General Information (15), Organization and Administration (8), Emergency Responses (3)]
August 28, 2023 [NRC] Request for Additional Information of the TRISO-X, LLC License Application for a Fuel Fabrication Facility (Set 3): ISA Summary (Programmatic) and Security
September 15, 2023 [TRISO-X] Supplemental Response to Chapter 1 RAI-10 and RAI-11 (Set 2) for the TRISO-X License Application [General Information]
September 29, 2023 Letter to TRISO-X for the fourth set of RAIs that includes an enclosure for Geotechnical and an enclosure for Hydrology
October 10, 2023 [NRC] Request for Additional Information on the Radiological Review for the TRISO-X Application
October 10, 2023 [NRC] Request for Additional Information on the Chemical Review for the TRISO-X Application
October 12, 2023 [TRISO-X] Response to Request for Additional Information Set 3 (ISA and Security) for the TRISO-X License Application [Integrated Safety Analysis (9) and Security (12)]
October 25, 2023 [NRC] Request for Additional Information Set 5 for the Radiological and Chemical Review Regarding the TRISO-X License Application for a New Fuel Fabrication Facility
November 8, 2023 [TRISO-X] Response to Request for Additional Information (Set 4) for the TRISO-X [Geotechnical (6) and Hydrological (6)]
November 17, 2023 [NRC] TRISO-X License Application Set 6 of RAIs for Material Control and Accounting, Fire, and Structural
November 17, 2023 [NRC] Request for Additional Information for Structural Review Regarding the TRISO-X License Application
December 9, 2023 [TRISO-X] Response to Request for Additional Information Set 5 (Chemical Safety and Radiation Protection) for the TRISO-X License Application)
December 15, 2023 [TRISO-X] Response to Request for Additional Information Set 6 (Structural, Material Control and Accounting, and Fire Safety) for the TRISO-X License Application
February 26, 2024 [NRC] Request for Additional Information Set for the Environmental Review Regarding the TRISO-X License Application
March 25, 2024 [NRC] Set 8 Containing a Programmatic Request for Additional Information for the Integrated Safety Analysis Review Regarding the TRISO-X License Application
March 27, 2024 [TRISO-X] Response to Request for Additional Information Set 7 Environmental Safety
May 8, 2024 [NRC] Status of the Requests for Additional Information for the TRISO-X License Application Issued as of April 2024
July 1, 2024 [TRISO-X] Supplemental Information for ISA RAI 1-9 Responses and RAI-10 Response for the TRISO-X License Application
September 5, 2024 [TRISO-X] TRISO-X, LLC, Supplemental Information for Management Measures and Quality Assurance RAI Responses
September 5, 2024 [TRISO-X] Enclosure 1 - Supplemental Information for Management Measures and Quality Assurance RAI Responses
November 1, 2024 [TRISO-X] Supplemental Information for Structural RAI Responses
December 30, 2024 [TRISO-X] Supplement to License Application
January 31, 2025 [TRISO-X] Supplement to License Application, ISA Summary and partial Environmental Report

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TRISO-X Meetings for the Safety and Safeguards Review
Date Meeting Title
December 12, 2019 X-Energy Meeting Summary and PowerPoint Presentation
September 11, 2019 Meeting Summary with X-Energy to Provide Pre-Application Information re Integrated Safety Analysis Methods for the TRISO-X Fuel Fabrication Facility License Application
January 10, 2023 Observations Regarding the License Application for a New Fuel Fabrication Facility
February 17, 2023 Summary of Call to Discuss Draft RAI Set 1 for Management Measures, Human Factors, and Structural for the License Application.
April 13, 2023 Supplement on ISA methodology and natural phenomena hazards
May 17, 2023 Clarification call to discuss RAI Set 1 for TRISO-X Quality Assurance, Human Factors, and Structural
July 13, 2023 Summary of Call with TRISO-X to Discuss Draft Requests for Information on Chapters 1 (Administrative), Chapter 2, and Emergency Plan
August 17, 2023 Summary of Meeting on 8-17-23 with TRISO-X to Discuss the Draft Requests for Additional Information (RAI) on Geotechnical and Hydrological topics
August 31, 2023 Updated Review Schedule and Estimated Staff Hours for the TRISO-X LLC License Application for A New Fuel Fabrication Facility
September 11, 2023 Email Summary of MS Teams Meeting with TRISO-X on September 11, 2023, to Discuss the Draft Chemical and Radiological Requests for Additional Information (RAI)
September 27, 2023 Summary of Meeting with TRISO-X to Discuss Draft Requests for Additional Information Responses on Integrated Safety Analysis
October 13, 2023 Email Summary of Meeting held on October 13, 2023 with TRISO-X to Discuss draft RAI Responses on Material Control & Accounting and Fire Safety
October 25, 2023 Email Summary - October 25, 2023 Teams Call to Discuss the TRISO-X Methodology for Non-inhalation Exposures
November 16, 2023 Email Summary of Electrical and Digital I&C Meeting with TRISO-X
December 11, 2023 Summary of Six Meetings between December 11, 2023 and January 23, 2024 with TRISO-X, LLC, to Align on a Supplement for the Responses to the Requests for Additional Information Regarding the Integrated Safety Analysis
December 18, 2023 Summary of Meeting on TRISO-X, LLC, to Align on the Need to Supplement the Responses to the Requests for Additional Information Regarding Management Measures
December 19, 2023 Summary of Meeting With TRSIO-X, LLC, To Align On TRISO-X Draft Environmental Safety Request for Additional Information
January 17, 2024 Summary of Meeting with TRISO-X, LLC, to Align on the TRISO-X Draft Environmental Impact Analysis Requests for Additional Information Part 2-2
January 24, 2024 Summary of Meeting on with TRISO-X to Align on NRC Supplement to Responses to Structural Requests for Additional Information
January 25, 2024 Summary of Meeting on January 25, 2024 with TRISO-X to Align on NRC Supplement Responses Management Measures
February 1, 2024 Email Summary of Meeting Held with TRISO-X on February 1, 2024 Regarding the Supplement for Programmatic ISA RAIs – Continued
February 12, 2024 Summary of Meeting 2-12-24 with TRISO-X to Discuss Draft RAIs on Environmental Protection
February 14, 2024 February 14, 2024 Trip Report for TRISO-X Visit to Discuss the Electrical and Digital Instruments and Control Portion of the License Application
February 21, 2024 Summary of Meetings on Held on 2-21-24 and 2-22-24 with TRISO-X for Supplements Regarding RAIs on the ISA Summary
March 18, 2024 Summary Of Meeting on March 18, 2024, With TRISO-X LLC, To Align On Draft Set 8 Requests For Additional Information Regarding The Integrated Safety Analysis
April 9, 2024 Cover Letter - Summary of Meeting on April 9, 2024, with TRISO-X LLC, to Discuss Supplement Responses to Structural Programmatic Requests for Additional Information for Building Risk Category
April 16, 2024 Email Summary of Meeting Held with TRISO-X, LLC on April 16, 2024, Regarding Clarifications for Chemical Safety Analysis
July 31, 2024 Summary of Meeting on June 6, 2024, with TRISO-X, LLC, to Align on the Supplement Responses to Integrated Safety Analysis Requests For Additional Information
August 1, 2024 Summary of Meeting on May 24, 2024, with TRISO-X LLC, to Align on the Supplemental Responses to the Integrated Safety Analysis Requests For Additional Information
August 26, 2024 Summary of Meeting on June 17, 2024, with TRISO-X, LLC. to Discuss the Status of the License Application Review
August 26, 2024 Summary of Meeting Held on June 17, 2024, with TRISO-X to Align on NRC Supplement Responses to Management Measures Requests for Additional Information
September 5, 2024 Summary of Meeting on July 17, 2024, with TRISO-X to Align on the Supplemental Responses to the Management Measures and Quality Assurance Requests for Additional Information
September 5, 2024 Summary of Meeting Held on June 27, 2024, with TRISO-X LAR Structural Meeting
October 10, 2024 Summary of Meeting on August 27, 2024, with TRISO-X to Discuss Draft Supplement Responses to Structural Programmatic Requests for Additional Information
October 10, 2024 Summary of Meeting on August 28, 2024, with TRISO-X, LLC to Align on the Supplement Responses to the Management Measures and Quality Assurance Requests for Additional Information
November 1, 2024 [TRISO-X] RAI Response to Structural Methodology RAI 2-2 “Building Risk Category”
November 26, 2024 [TRISO-X] Feedback on Chemical Safety RAI-9 Response – Dispersion in a Large Volume
December 19, 2024 Summary Of Regulatory Audit For TRISO-X To Discuss Supplement to the Structural Methodology Request for Additional Information
December 20, 2024 Memo to TRISO-X, LLC Summary of Meeting Structural Meeting on October 17, 2024
January 2, 2025 Summary of Meeting Held on November 7, 2024 with TRISO-X Chemical Safety Request for Additional Information
January 14, 2025 Meeting to discuss NRC's draft electrical/digital I&C RAIs with TRISO-X 
January 23, 2025 Summary Of Regulatory Audit For TRISO-X Integrated Safety Analysis Definitions of Unlikely and Highly Unlikely 

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Page Last Reviewed/Updated Tuesday, October 29, 2024