Water leaking from No.1 reactor, NHK, May 12, 2011:
Tokyo Electric Power Company says water may be leaking from a hole in the No.1 reactor at the Fukushima Daiichi nuclear plant, causing a sharp drop in the water level inside the reactor. [...]
On Thursday morning, it was found that the water level was more than one meter below the bottom of the fuel rods. The water is believed to be leaking into the containment vessel. [...]
The Nuclear and Industrial Safety Agency said that if the latest data is accurate, it seems parts of the fuel rods have melted and accumulated at the bottom of the reactor. But it added that it believes the fuel rods are being cooled.
Unit 1, you need substantial revision of the cooling system, MBS Mainichi News, May 12, 2011:
Excerpts from translation by EX-SKF
[I]t is possible that the fuel rods have melted to the bottom of the RPV, and the molten mass is being cooled by the water at the bottom, according to the [government] source.
Published: May 12th, 2011 at 5:55 am ET