It seems that the Fukushima nuclear plant (with a Boiling Water Reactor)
http://en.wikipedia.org/wiki/Boiling_water_reactor
is having a problem with cooling:
http://edition.cnn.com/2011/WORLD/asiapcf/03/11/japan.nuclear/index.html
The cooling systems are responsible for cooling down the reactor vessel and keep them away from meltdown (Chernovyl case).
So, let's hope that they'll manage to keep that reactor cooled down and the meltdown will be nothing else but science fiction in this case.
My support to all the affected Japanese people.
