Failures still occur though Fukushima's plants blew up because they couldn't get cooling water because of the tsunami theres always some point of failure that gets overlooked
They don't however render the surrounding areas unsafe for human visitation for centuries afterwards though
I love how nuclear supporters completely ignore the waste which is dangerous for a very, very long time its carbon free certainly but claiming its clean is misleading at best.
Neither do most nuclear incidents.
I would also point you to all the chemical sites that even without major accidents are deemed too hazardous for humans to live on without massive clean-ups, let alone some of the places where there have been accidents that have required clean-ups of topsoil similar to what happened around Fukushima but on a smaller scale.
IIRC even "just" something like a petrol station can require topsoil removal before you're allowed to build housing on it.