Once again: Nuclear power plants aren't really safe beyond 50 years

That's usually how long they are designed to be "safe enough" (whatever that means) (50 years). So, when you go beyond 50 years you might be taking everyone's lives into your hands. Most of the pipes are laid in concrete. Once you do this getting them out or even fixing them becomes problematic. So, mostly what you have to do is to cover the whole site in concrete and shut it down and hope that people that live nearby don't glow it he dark for 25,000 or 50,000 years into the future. Because that radiation may stay there or leak out in various different directions: into the soil, into the water table, into the air, into your food, etc. etc. etc.

And literally every nuclear power plant is like this. You cannot "Clean up the site really" Where are you going to put all the radiated stuff?

So, most of it stays radiated and there on site and hopefully covered with concrete for thousands of years. So, what happens when plants (like trees begin to crack and grow through the concrete?) or even blades of grass are known to grow through and break concrete over time.