Nuclear reactor coolant

Nuclear reactor coolants
Coolant Melting point Boiling point
Heavy water at 154 bar 345 °C
NaK eutectic -11 °C 785 °C
Sodium 97.72 °C 883 °C
FLiNaK 454 °C 1570 °C
FLiBe 459 °C 1430 °C
Lead 327.46 °C 1749 °C
Lead-bismuth eutectic 123.5 °C 1670 °C

A nuclear reactor coolant is a coolant in a nuclear reactor used to remove heat from the nuclear reactor core and transfer it to electrical generators and the environment. Frequently, a chain of two coolant loops are used because the primary coolant loop takes on short-term radioactivity from the reactor.