One question - while I would love to see nuclear power grow what are the risks of a tank breakage? Better than a meltdown probably at least - I would guess possible groundwater contamination if not in a suitable geological location which while not good would still be inhabitable.
I like ThorCon's approach - the entire facility is intended to be 100 feet underground, secure from most anything including jet airliner crash.
As another poster stated, the emergency storage tank can be made arbitrarily durable.
If anything goes wrong, gravity drains the molten salt into a storage pool that spreads it out, stopping the reaction and letting it cool and solidify. The lining of the underground pool can be made arbitrarily thick and durable. Contamination like at Fukushima is physically impossible unless someone deliberately damages that lining.