Natrium
Natrium is TerraPower's 345 MWe sodium-cooled fast reactor SMR with 500 MWth molten-salt thermal storage for flexible output.
Pool-type SFR with 150 MWt core (HALEU/MOX), 850°C salt storage discharges 500 MWe 5.5 hours. Demo at Kemmerer WY, $4B DOE funding, 2030 target. Builds on Natrium pilot, PRISM heritage.
Why it matters now
Natrium addresses 2025-2026 grid flexibility for data centers via storage. DOE selection accelerates Gen IV amid HALEU production scale-up.
Related reactors
PRISM