If you have good engineers, using molten sodium as your primary coolant does have a fair number of safety advantages over water. The stuff boils at 1,621 °F - so you lose 99.9% of the traditional (water cooling) problems with ultra-high pressures and boiling dry. There is no risk of hydrogen gas explosions if things go badly wrong. Thermal safety margins are far wider. Etc.

And if your engineers aren't good enough to trust with a mere sodium cooling system, then they certainly aren't good enough to trust with anything nuclear.