In the page it isn't explained how it shuts down passively in a loss of coolant event? Since the coolant is not doing moderation, removing it doesn't reduce rea

In the page it isn't explained how it shuts down passively in a loss of coolant event? Since the coolant is not doing moderation, removing it doesn't reduce reactivity at all. You have a 30 bar helium pressure vessel and heat exchangers etc. I wonder how much it's going to leak. Not saying it's bad, just interested in these questions. Some other designs have these issues in focus.