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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any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

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Pre-Application Activities for Advanced Reactors

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Below is a summary of all Advanced Reactor (non-LWR and LWR) applicants, vendors, and research/test reactors that have notified the NRC of their intent to engage, along with a history of those interactions.

The table of contents is arranged by technology and is linked to each applicant or vendors pre-application page.

The NRC guidance for these pre-application engagements is found in Appendix A of the Interim Staff Guidance DANU-ISG-2022-05, “Review of Risk-Informed, Technology-Inclusive Advanced Reactor Applications—Roadmap.” While this guidance focuses on non-light water reactor technologies, the document, especially the environmental sections, generally applies to all reactor technologies.

To be considered active, a vendor or applicant must either submit a Regulatory Engagement Plan (REP) or show a substantial history of pre-application interactions with the NRC. If no project activity (e.g., interactions with the NRC, updates to REPs, etc.) occurs for one year, the project will be deemed inactive.

High Temperature Gas Reactors Light Water Reactors Molten Salt Reactors / Molten Chloride Fast Reactors Sodium Cooled Fast Reactors Other Designs/ Not Specified
Energy Northwest Deep Fission Abilene Christian University * ARC Clean Technology Aalo Atomics
General Atomics GE-Hitachi BWRX-300 Kairos Power, LLC Oklo Inc. Appalachian Power Company
General Atomics Electromagnetic Systems * Last Energy Natura Resources TerraPower & GE - Hitachi Natrium Blue Energy, Inc.
* Radiant Industries, INC. SMR, LLC (Holtec) TerraPower, LLC   Duke Energy -  Belews Creek, NC
* Terra Innovatum (SOLO) TVA - Clinch River Nuclear Site Terrestrial Energy USA, INC.   Japan Atomic Energy Agency
* University of Illinois at Urbana-Champaign -  NANO Nuclear Energy Inc. Westinghouse AP300     *Shepherd Power, LLC
X-Energy, LLC 
(XE-100)		       Texas A&M University -  RELLIS Campus
X-Energy, LLC (XENITH)       * Westinghouse eVinci
 
Inactive Projects - There are no Inactive Projects at this time.

* Indicates Microreactor Design

High Temperature Gas Reactors

Energy Northwest 

General Atomics

General Atomics-Electromagnetic Systems

Radiant Industries, Inc

Terra Innovatum

University of Illinois at Urbana-Champaign - NANO Nuclear Energy Inc.

X-Energy, LLC

X-Energy, LLC

Light Water Reactors

Deep Fission

Last Energy

Vendor: GE-Hitachi Nuclear Energy (GEH)

Vendor: SMR, LLC (A Holtec International Company)

Tennessee Valley Authority – Clinch River Nuclear Site

Westinghouse Electric Company

Molten Salt Reactors / Molten Chloride Fast Reactors

Abilene Christian University

Kairos Power LLC

Natura Resources, LLC

TerraPower, LLC

Terrestrial Energy USA Inc

Sodium Cooled Fast Reactors

ARC Clean Technology

Oklo Inc.

TerraPower, LLC and GE Hitachi

Other Designs

Aalo Atomics – Idaho Nuclear Project

Appalachian Power Company

Blue Energy, Inc.

Duke Energy

Japan Atomic Energy Agency (JAEA)

Shepherd Power

Texas A&M University

Westinghouse Electric Company

Page Last Reviewed/Updated Friday, April 4, 2025