Natrium enters UK regulatory review (first overseas)

TerraPower / UK ONR — TerraPower's Natrium design was accepted into the UK's Generic Design Assessment, with the Office for Nuclear Regulation, the Environment Agency and Natural Resources Wales beginning Step 1 in June 2026 — the sodium-cooled fast reactor's first overseas licensing push, following its US construction permit at Kemmerer. The same 345 MWe design with molten-salt storage boosting to 500 MW.