nuclear-news

UK regulators to begin formal assessment of TerraPower’s 345MWe sodium-cooled fast reactor.

 New Civil Engineer 23rd Feb 2026, By Thomas Johnson

UK regulators have been asked to begin a formal assessment of the Natrium nuclear reactor design developed by US company TerraPower.

The Department for Energy Security and Net Zero (DESNZ) told the Office for Nuclear Regulation (ONR), the Environment Agency and Natural Resources Wales to prepare for a Generic Design Assessment (GDA) of the sodium-cooled fast reactor after a readiness review concluded the design is prepared to enter the regulatory process. The GDA will not start until the regulators have agreed timetables and resourcing.

The GDA is a multi-year scrutiny process in which regulators examine the safety, security and environmental arrangements for a reactor design before any site-specific consents or construction are made. It has been used for previous new-build designs and is intended to give investors and potential operators clearer regulatory certainty.

TerraPower, co-founded by Microsoft’s Bill Gates, is developing the Natrium design as part of a US public–private partnership. The company’s first demonstration plant is being built with support from the US Department of Energy’s Advanced Reactor Demonstration Program (ARDP). The ARDP allows up to $2bn (£1.5bn) in federal funding for the project on a 50:50 cost-share basis; TerraPower and its partners are expected to match that investment……………………………………………………………………………………

 sodium-cooled reactors pose different technical and regulatory challenges to light-water designs. Liquid sodium reacts chemically with water and air, which requires specialised handling, testing and safety arrangements…………………………..
https://www.newcivilengineer.com/latest/uk-regulators-to-begin-formal-assessment-of-terrapowers-345mwe-sodium-cooled-fast-reactor-23-02-2026/

February 26, 2026 - Posted by Christina Macpherson | safety, UK