[thehhhyips]

I cant tell what that is? dust/debris cloud from something collapsing? Mabye the quake weakened one of the structures and it collapsed?

They've just shown the explosion that produced that cloud - it was indeed a large explosion and that cloud picture was perhaps 2 to 4 seconds later.
As has been surmised, a steam explosion was one of the main concerns and it looked like a pressure vessel failing - certainly a long way from a controlled discharge.

Terrible situation there and SFA that anyone can do about it - just hope the engineers in the plant weren't hurt.

Just confirmed, explosion leaked radiation an hour ago!
Replay suggests main wave front from the explosion was straight up.
Not a Chernobyl, but very serious! People ordered to stay inside.