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 lini

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.