New sodium Nuclear Power Station in Wyoming

The Natrium reactor being built in Kemmerer uses sodium instead of water as a heat sink for the reactor core. That heat will then be transferred to water, which will produce steam to turn turbines. Sodium reacts with water and air, which Tallen said poses a huge risk for accidents. 25 Jan 2023

What is the disadvantage of Natrium reactor?
Sodium coolant, for example, can burn when exposed to air or water, and a sodium-cooled fast reactor could experience uncontrollable power increases that result in rapid core melting.18 Mar 2021

Natrium reactor uses sodium as its coolant. This liquid sodium has a significantly higher boiling point, 882 degrees Celsius, than water used to cool conventional reactors.

Natrium

https://www.energy.gov/ne/articles/next-gen-nuclear-plant