TerraPower’s Natrium Reactor Enters U.K. Generic Design Assessment, Marking First Overseas Regulatory Push

New updates have been reported about TerraPower.

TerraPower has secured acceptance of its Natrium reactor into the United Kingdom’s Generic Design Assessment (GDA), its first international regulatory filing for the advanced nuclear technology. CEO Chris Levesque said the company will deploy its regulatory and technical teams to support U.K. authorities through the multi-year review, positioning Natrium for potential deployment in a key European market.

The Natrium design pairs a 345 MWe sodium-cooled fast reactor with molten salt-based energy storage capable of briefly boosting output to 500 MWe, enabling steady baseload generation with rapid peak-demand response. TerraPower is already advancing its first Natrium project in the United States under a public-private partnership with the U.S. Department of Energy, where construction of non-nuclear facilities began in June 2024 and the plant is slated to become the first utility-scale advanced nuclear project in the country.