TerraPower announced that the final environmental impact statement for its Natrium small modular reactor has been completed by the Nuclear Regulatory Commission.

Over the past several weeks, there has been a lot of activity on the nuclear front in Kansas, ranging from new nuclear sitings to investments.

At a glance: TerraPower signed a memorandum of understanding with Evergy and the Kansas government on small modular reactors; Deep Fission announced investments in Kansas, Utah, and Texas; and the Kansas Board of Regents will invest $15 million in energy projects. Read on to get more information on these items.

El Segundo, Calif.–based reactor start-up Valar Atomics recently announced that it has broken ground on its test reactor, the Ward 250, at Utah San Rafael Energy Lab (USREL), becoming the second company participating in the Department of Energy’s Nuclear Reactor Pilot Program to do so.

President Trump will arrive in the United Kingdom this week for a state visit that promises to include the usual pomp and ceremony alongside the signing of a landmark new agreement on U.S.-U.K. nuclear collaboration.

Almost every day this week has featured headlines concerning announcements, signings, and progress across Utah’s nuclear sector.

At a glance: TerraPower, Flagship, and the state signed a memorandum of understanding to cooperate on siting a Natrium reactor; $5 million may come to Camp Williams for General Matter–related site preparation work; and Nusano cut the ribbon on a radioisotope production facility.

TerraPower announced yesterday that it has begun construction on the Kemmerer Training Center (KTC) at the site of the Natrium project in Kemmerer, Wyo. According to the company, the state-of-the-art KTC is the second facility to reach the construction milestone of the advanced nuclear project.

The Nuclear Energy Maritime Organization (NEMO) recently announced that it was officially granted nongovernmental organization consultative status with the International Maritime Organization.

A subcontract has been signed with NQA-1 qualified fabricator AvanTech to support TerraPower’s Natrium project in Kemmerer, Wyo. AvanTech will design advanced sodium processing system modules and supporting skids for the Natrium plant as well as fabricate and deliver the test and fill facility’s cold trap skid.

Bellevue, Wash.–based TerraPower has awarded three supplier contracts to U.S. companies to support its Natrium demonstration project, construction of which began in June 2024 in Kemmerer, Wyo. The new contracts represent the fifth round of procurement awards for the Natrium project.

The Nuclear Regulatory Commission has whittled down the timeline for reviewing TerraPower’s construction permit application for Kemmerer Power Station Unit 1 in Wyoming. Announcing a new, more aggressive schedule, the NRC said it aims to complete its review by the end of 2025, eight months earlier than originally planned.

ASP Isotopes Inc. announced on May 19 that it now has conditional commitments from TerraPower for a loan that could partially finance a new uranium enrichment facility in South Africa. The companies have also reached a supply agreement for high-assay low-enriched uranium from the proposed facility that, according to ASP, “supports the supply of HALEU for the first fuel core for TerraPower’s Natrium Plant in Wyoming and contemplates the supply of HALEU over a 10-year period.”

The Nuclear Regulatory Commission staff has concluded—with an assist from a Department of Energy environmental assessment released in February—that no environmental impact statement is needed for an exemption request from TerraPower that would allow the company to begin construction of the energy island of its planned Natrium sodium fast reactor in Kemmerer, Wyo. The NRC’s EA and finding of no significant impact (EA/FONSI), published on May 7, could clear the way for significant construction to begin while the NRC continues to review TerraPower’s construction permit application.

Workers with Oak Ridge Office of Environmental Management contractor Isotek have surpassed a significant milestone in the supply of medical radioisotopes, extracting more than 15 grams of rare thorium-229 through the Department of Energy’s Thorium Express Project.

Here is a recap of industry happenings from the recent past:

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TerraPower’s Natrium reactor advances on several fronts

TerraPower has continued making aggressive progress in several areas for its under-construction Natrium Reactor Demonstration Project since the beginning of the year. Natrium is an advanced 345-MWe reactor that has liquid sodium as a coolant, improved fuel utilization, enhanced safety features, and an integrated energy storage system, allowing for a brief power output boost to 500-MWe if needed for grid resiliency. The company broke ground for its first Natrium plant in 2024 near a retiring coal plant in Kemmerer, Wyo.

Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.

Seattle-based TerraPower signaled its interest this week in building its Natrium small modular reactor in the United Kingdom, the company announced.

TerraPower sent a letter to the U.K.’s Department for Energy Security and Net Zero, formally establishing its intention to enter the U.K. generic design assessment (GDA) process. This is TerraPower’s first step in deployment of its Natrium technology—a 345-MW sodium fast reactor coupled with a molten salt energy storage unit—on the international stage.

The Department of Energy has announced its first round of conditional commitments to provide high-assay low-enriched uranium to five U.S. nuclear developers. According to the DOE, the delivery of HALEU will support the commercialization of advanced nuclear technologies, aiming to deliver secure, affordable, and reliable energy to Americans.

The Department of Energy announced March 31 that a new Molten Salt Flow Loop Test Bed at Idaho National Laboratory recently went through its inaugural test run. The closed-loop test system will allow for continuous monitoring and analysis of chloride-based molten salt reactor technology and instruments before the construction of the Southern Company/TerraPower Molten Chloride Reactor Experiment. MCRE—an experimental fast-spectrum molten salt research reactor—will be built at INL’s repurposed Zero Power Physics Reactor, which has been renamed LOTUS (Laboratory for Operation and Testing in the United States).

TerraPower has continued to make aggressive progress in several areas for its Natrium Reactor Demonstration Project since the beginning of the year. Natrium is an advanced 345-MWe reactor that has liquid sodium as a coolant, improved fuel utilization, enhanced safety features, and an integrated energy storage system, allowing for a brief power output boost to 500 MWe if needed for grid resiliency. The company broke ground for its first Natrium plant in 2024 near a retiring coal facility in Kemmerer, Wyo.

Scientists at Idaho National Laboratory continue to make progress on the Molten Chloride Reactor Experiment (MCRE), which entails research and development for the first operational advanced nuclear reactor to use a mixture of molten chloride salt and uranium as fuel and coolant. The experiment is evaluating the safety and physics of the molten chloride fast reactor that Southern Company and TerraPower are planning to build.