AP is reporting a very worrying comment by Greg Jaczko, chairman of the US Nuclear Regulatory Commission:
US nuclear agency chief says no more water in spent fuel pool at troubled Japan plant.
That presumably refers to No 4 reactor. Jaczko is currently giving a briefing on the nuclear plant crisis in Japan to the US Senate's committee on the environment and public works. (There's a live webcast of the briefing here.) If Jaczko's statement is correct, then there is nothing to stop the exposed fuel rods from getting hotter and melting down. And Jaczko should know: the NRC has experts on the ground in Japan.
http://www.guardian.co.uk/world/blog/2011/mar/16/japan-nuclear-crisis-tsunami-aftermath-live
Han har alltså folk på plats därför vet han...