Actually funny you mention that. Initially it was bad, but as time has gone on it’s arguable that the Chernobyl exclusion zone has actually helped the ecosystem in the area because humans aren’t around. https://www.unep.org/news-and-stories/story/how-chernobyl-has-become-unexpected-haven-wildlife

Also, nuclear reactors aren’t built that way anymore, and all the RBMK nuclear reactors have been fixed so they aren’t able to experience that again.