The idea with molten salt reactors is that they aren't under pressure. Unlike a PWR, which will experience more and more pressure until it pops, a molten salt r

The idea with molten salt reactors is that they aren't under pressure. Unlike a PWR, which will experience more and more pressure until it pops, a molten salt reactor can handle much higher temperatures before failing. This enables designs that can be passively cooled in the event of coolant system failures.