re: #508 HoosierHoops

The issue is the primary coil…Primaries transfer heat to the secondary coil.
Primaries are hot..Secondaries are just plain old steam
why do you fill a primary coil with pure..And I mean effen pure water?
This is the water flashed to steam and is hot. the smallest impurity will cause a hot spot and a leak..A primary coil leak is the disaster…

You don’t. You fill the primary coil with a liquid fluoride salt (molten) which, in addition to being a fantastic heat conductor with a very high boiling point, has the wonderful property whereby overheating it expands the salt past criticality.

Negative feedback = awesome built-in safety.

Does that make sense?