> although if the coolant lost and replaced with air you would get a nasty Chernobyl-style graphite fire Or alternatively, radioactive dust could be released i

> although if the coolant lost and replaced with air you would get a nasty Chernobyl-style graphite fire Or alternatively, radioactive dust could be released into the atmosphere such as THTR-300 did. INL did a gap analysis in 2011 between what was known and what needed research. The german AVR reactor had technical issues that weren't expected -- dust being one of them. https://inldigitallibrary.inl.gov/sites/sti/sti/5026004.pdf https://inldigitallibrary.inl.gov/sites/sti/sti/5026004.pdf From what I can tell the dust issue is still a point of contention.