Overall what I understand of NuScale's approach seems to account for most everything that can go wrong. But what happens if there is a natural disaster that causes much of that water to leak away quickly? Is there a failsafe for that as well?
I assume a straightforward geological study would prevent events like https://www.theguardian.com/world/2022/jul/22/man-dies-after...
Dams collapse mainly for this reason, and those, while killing many people and destroying whole cities, do not leave the whole region uninhabitable.