[Lochleg]

There are units that still require cooling. https://www.wired.com/story/the-situation-at-chernobyl-is-de...

Wired also had an old article about the long-term situation with radioactive contamination, which the surrounding environment has to absorb including wildlife that continues to mutate rapidly last I checked. So, I would say secure containment is paramount.

Nuclear energy can be safe, but we keep failing to recognize how short of foolproof the many fail-safes involved really are even in a high-tech society. Things going bad when you lose power or a single (water) pump are the prime examples.