The Nuclear Regulatory Commission recently announced that it has completed its final safety evaluation (SE) for the construction permit application for Kemmerer Power Station Unit 1 in Kemmerer, Wyo. The application was submitted by TerraPower on behalf of its wholly owned subsidiary, US SFR Owner (USO).

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

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.

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 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.

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.

Lisa Marshall
president@ans.org

This year's ANS Conference on Nuclear Training and Education (CONTE), held in early February, tackled emerging approaches to nuclear skills and the workforce. How do we attract, retain, and qualify our future professionals? What technologies will enhance teaching and assessment methods?

In 2024, the Department of Energy called the following developments “wins for nuclear energy”:

• Vogtle-4 had its commercial start.
• The ADVANCE Act to accelerate deployment of advanced reactors.
• Reactor recommissioning announcements and collaborations with tech companies.
• Growing our domestic nuclear fuel supply chain and expanding domestic capacity by 200 GW.
• Demonstration projects such as Natrium, Project Pele, and Hermes.

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.

Aiming to deploy the nation's first small modular reactor, TerraPower has announced contracts for the final long-lead items needed for its Natrium unit, currently under construction in Wyoming.

In February, the Community of Practice (CoP) webinar series, hosted by the American Nuclear Society Standards Board’s Risk-informed, Performance-based Principles and Policies Committee (RP3C), celebrated its fifth anniversary. Like so many online events, these CoPs brought people together at a time when interacting with others became challenging in early 2020. Since the kickoff CoP, which highlighted the impact that systems engineering has on the design of NuScale’s small modular reactor, the last Friday of most months has featured a new speaker leading a discussion on the use of risk-informed, performance-based (RIPB) thinking in the nuclear industry. Providing a venue to convene for people within ANS and those who found their way online by another route, CoPs are an opportunity for the community to receive answers to their burning questions about the subject at hand. With 50–100 active online participants most months, the conversation is always lively, and knowledge flows freely.

Progress continues for TerraPower’s Natrium plant, with the latest win coming in the form of a state permit for construction of nonnuclear portions of the advanced reactor.

TerraPower announced this week that it has awarded the major manufacturing contracts for its Natrium plant reactor enclosure system.

These vendor awards help advance deployment and commercialization of what the company is calling “America’s first advanced reactor,” according to TerraPower’s press release. The news is also a major milestone in establishing the advanced nuclear supply chain, the company added.

The Nuclear Regulatory Commission has notified TerraPower that the company has delivered enough information on volcanic risk activity around its proposed small modular reactor project in Kemmemer, Wyo., to satisfy the federal review process.

TerraPower has announced its selection of industry experts Sargent & Lundy to design the Kemmerer Training Center for its Natrium reactor demonstration project in Wyoming.

A public hearing in Kemmerer, Wyo., drew dozens of comments and questions about TerraPower’s plans to build the Natrium nuclear reactor demonstration project in the coming years.

A ceremony in Wyoming yesterday marked the official start of construction of TerraPower’s planned Natrium reactor demonstration project.

While currently awaiting final review from the U.S. Nuclear Regulatory Commission, TerraPower is moving forward with nonnuclear construction work at a retired coal plant near Kemmerer, Wyo. The groundbreaking brought together TerraPower leaders, government officials, Natrium project partners, industry advocates, and community supporters.

The Nuclear Regulatory Commission this week announced the window is open for members of the public to request a hearing on the construction permit application for TerraPower’s Natrium nuclear power plant, which is set to be built near Kemmerer, Wyo.

The U.S. Nuclear Regulatory Commission has formally accepted TerraPower’s small modular reactor construction permit application and is scheduling it for review.

The company’s Natrium reactor demonstration project—the nation’s first commercial advanced reactor of its kind—would be built on land in Wyoming near one of the state’s retiring coal plants. Kemmerer Power Station Unit 1 would operate as a 345-MW sodium-cooled reactor in conjunction with molten salt–based energy storage.