US-based global engineering and manufacturing company Curtiss-Wright Corporation has installed a Stage 1 Training Simulator (TSN) at TerraPower’s Natrium nuclear reactor site in Kemmerer, Wyoming. The TSN is a full-scope simulator designed to replicate physical plant equipment and simulate real-time system conditions. It will serve as the core platform for operator training and regulatory licensing.
The Kemmerer project, heavily backed by Microsoft co-founder Bill Gates and co-funded by a Department of Energy (DOE) commitment, is promoted as a milestone for next-generation nuclear energy. Natrium comprises a 345 MWe sodium-cooled fast reactor with an integrated molten salt-based energy storage system that can ramp up the plant’s output to 500 MWe for over five hours to meet peak grid demand.
The system runs on Curtiss-Wright’s proprietary 3KEYMASTER simulation software, a high-fidelity platform widely used across the nuclear and power-processing industries. Beyond the simulator, Curtiss-Wright is also contracted to develop the Natrium plant’s Distributed Control Systems (DCS) and its Reactor Protection System (RPS).
“This is a key milestone in our collaboration with TerraPower that exemplifies our ability to leverage Curtiss-Wright’s advanced technologies, domain expertise, and engineering leadership to meet the needs of next-generation nuclear reactors.” said Curtiss-Wright Chair & CEO Lynn M Bamford.
George Piccard, Vice President Plant Operations at TerraPower, noted: “Building the world’s most advanced reactor demands an equally advanced approach to operator training. By working with Curtiss-Wright to deliver the Natrium Training Simulator, we are laying the foundation to scale a qualified nuclear workforce across every future Natrium plant and ensuring our operators are fully prepared long before the plant comes online.”
The TSN is a full-scope simulator that completely replicates the physical plant equipment, control room environments, and real-time operational conditions of the upcoming reactor. It allows engineers to model intricate thermal-hydraulic and fluid dynamics. It is a global standard for modelling complex environments in commercial nuclear facilities.
According to Piccard, the primary benefit of getting a full-scope simulator live at this stage is that it prepares control room operators long before the physical plant comes online. The simulator serves as the training foundation not just for Kemmerer Unit 1, but as a repeatable training model to scale a qualified nuclear workforce across all future Natrium plants.
The simulator acts as a digital twin that will directly interface with the operational technology Curtiss-Wright is building under separate contracts – the DCS, which manages day-to-day operations and fluid transfers; and the RPS designed to safely shut down the reactor during an anomaly.
By testing these control systems in a simulated environment first, engineers can stress-test the plant’s logic, sodium cooling loops, and molten salt energy storage systems under thousands of hours of virtual operation prior to regulatory licensing.
First nuclear concrete for the reactor is planned for 2027 followed by submission of the Operating Licence Application to the Nuclear Regulatory Commission (NRC) in 2028. Planned physical assembly completion and the initial nuclear fuel loading is scheduled for 2030, with final system integration, pilot testing, and commercial grid operation set for 2031.
Early deployment units under commercial agreements, such as the partnership with Meta to build up to eight subsequent Natrium plants providing 2.8 GWe of clean data centre baseload is targeted for 2032 and commercial electricity generation for international expansions, starting with the first prospective Natrium plant in the UK for 2034.
Whether the 2030/2031 commercial timeline is realistic is a subject of significant debate between industry observers and the project’s backers. While TerraPower has achieved significant structural progress, nuclear engineering experts and independent analysts generally view a 42-month construction window for a First-of-a-Kind (FOAK) reactor as highly optimistic.
Constructing a reactor building, installing custom cooling loops, and achieving fuel load within 3-4 years has rarely been achieved in recent nuclear history. In September, TerraPower unexpectedly replaced Bechtel as its lead engineering, procurement & construction (EPC) contractor after failing to agree on terms.
Although the local municipality says work remains on track, changing a primary contractor at the start of heavy construction introduces logistical friction.
The project already slipped from its original 2028 target to 2030/2031 because Russia was previously the only commercial supplier of the required high-assay low-enriched uranium (HALEU) fuel. While domestic sourcing with Centrus and international sourcing with South African providers are being set up, any delay in scaling these new enrichment facilities will block the 2030 fuel-load milestone.
On the other hand, NRC cleared the project’s construction permit in March – reducing the projected review cycle by several months. Natrium is the first commercial non-light-water reactor approved in the US in over 40 years. Unlike traditional plants where everything is tied to the nuclear island, the Natrium design separates nuclear construction from the molten salt energy storage and traditional turbines where work began in 2024. Testing the energy storage system separately from the reactor reduces overall integration time.
Backed by private funding from Bill Gates and a $1.6bn congressional appropriation, the project has financial resilience and is under pressure from tech companies to get online quickly to power AI data centres.
If the newly appointed construction contractor seamlessly transitions into the role, and domestic HALEU fuel enrichment yields results by 2029, then a 2031 grid connection may be plausible. However, given the history of nuclear infrastructure, a conservative estimate would suggest expecting delays to push final commercial operations closer to 2032 or 2033.
