Japan nuclear crisis: Fukushima shutdown for January, BBC, May 17, 2011:
In recent days the plant’s operator has revealed that the damage sustained by the reactors immediately after the magnitude-9.0 earthquake and tsunami was far more severe than initially thought. [...]
Within 16 hours most of the fuel in reactor 1 had melted to the floor of the pressurised chamber housing the reactor, creating a hole that allowed 3,000 tonnes of contaminated water to leak into the basement of the building.
Officials said the fuel in reactors number 2 and 3 was also exposed to the air and might have largely melted too. [...]
Published: May 17th, 2011 at 1:01 pm ET