Nuclear fuel at Fukushima No. 1 unit melted after full exposure, Kyodo, May 12, 2011:
Water inside the troubled No. 1 reactor of the Fukushima Daiichi nuclear power plant was at an unexpectedly low level, not enough to cover the nuclear fuel, hinting that a large part of the fuel melted after being fully exposed, Tokyo Electric Power Co. said Thursday based on data obtained by adjusted gauges. [...]
[T]he latest finding on the situation inside the unit [...] suggests that a significant amount of the water injected into the reactor core to keep the fuel cool as an emergency measure was leaking out to the primary container.
Published: May 12th, 2011 at 9:50 am ET