EDIT: Huh, this was supposed to be a response to https://news.ycombinator.com/item?id=29168027 https://news.ycombinator.com/item?id=29168027 but apparently it

EDIT: Huh, this was supposed to be a response to https://news.ycombinator.com/item?id=29168027 https://news.ycombinator.com/item?id=29168027 but apparently it got attached to the wrong parent when the articles were merged. There was ASTRID, another sodium cooled fast reactor design, that was cancelled a couple of years ago before it got off the drawing board.