Molten salt reactors were invented in the early 60’s for the purpose of making a nuclear reactor that could be used in a plane. They are different from the water cooled reactors in common usage today. When water is superheated it dissociates into hydrogen and oxygen so extreme pressure is a result. Molten salt never boils so the pressure doesn’t build up to explosive levels.
My question was what is the moderator in a molten salt reactor? In a light water reactor it is the water. If the core in a light water reactor loses water the reaction will just stop, though the latent heat will melt the fuel rods. That’s what happened to Three Mile Island. If the salt is the moderator in a molten salt reactor then how is it any safer? If the salt drains away the core will still melt won’t it?