re: #579 Spare O’Lake

Oh, so they can only melt down when they are operating properly, but they won’t? Oh good, I feel better now.

That’s just it; if they are operating properly (coolant flowing), they will continue the chain reaction, but if they get too hot, they stop. Thus they cannot melt down.
(BTW, at least one safe design dates back to the early 1960’s or maybe earlier.)