LFTR salt is not inert and is somewhat corrosive. In fact it reacts with water and gets even more corrosive (Hydrofluoric acid is produced). This can also lead to hydrogen production…. Also LFTR still have the decay heat to contend with as well. So it still not as simple as “it drains and is off”. It needs to drain to somewhere than can still cool the salts and not melt. if you have a 1GW plant, even .1% is a lot of heat to get rid of in a passive configuration.
