If nuclear waste boils in reactor malfunction what is the worst possible outcome?

WHAT THE HELL!!! It will probably blow up the whole damn area surrounding it. I wonder why you need to know this if you live near a nuclear waste plant GET THE HELL OUT OF DODGE MAN(assuming your a boy)!!! It is like lava in a way and it will probably burn the whole perimeter down. I had a relative(we weren't close) that worked in a nuclear waste plant and a small amount blew up and unfortunatly she was standing right in front of it. I REALLY, TRUELY, HONESTLY WISH YOU LUCK.