The only good news is that the reaction masses are cooling quickly and may settle down fast enough.
Dropping water on it is a little like pissing on a bonfire.
The sharp rise in plant radioactivity strongly suggests something has already broken out and it is beyond any easy repair. A melt down of some sort is certainly already under way and we do not know how far it will go.
A really worst case scenario could see Tokyo abandoned. Be scared. It is not getting better yet.
Sunday 13 March 2011 (0800 hrs
Following a high-level meeting called by the lame-duck prime minister, Japanese agencies are no longer releasing independent reports without prior approval from the top. The censorship is being carried out following the imposition of the Article 15 Emergency Law. Official silencing of bad news is a polite way of reassuring the public. According to the chief Cabinet Secretary, reactor heat is being lowered and radiation levels are coming down. The Unit 1 reactor container is not cracked despite the explosion that destroyed its building.
The explosion did not erupt out of the reactor.
So what caused the explosion that blasted away the reinforced concrete roof and walls? Silence.