Japanese authorities: 3 Fukushima reactors likely had melt-through – more serious than meltdownPosted: June 8, 2011 at 10:06 am by Roz Potter in Nuclear power disaster, Radiation health risks
From the UK’s Guardian, Link
Molten nuclear fuel in three reactors at the Fukushima Daiichi power plant is likely to have burned through pressure vessels, not just the cores, Japan has said in a report in which it also acknowledges it was unprepared for an accident of the severity of Fukushima.
It is the first time Japanese authorities have admitted the possibility that the fuel suffered “melt-through” – a more serious scenario than a core meltdown.
The report, which is to be submitted to the International Atomic Energy Agency (IAEA), said fuel rods in reactors No 1, 2 and 3 had probably not only melted, but also breached their inner containment vessels and accumulated in the outer steel containment vessels.
The report comes a day after Japan’s nuclear safety agency said the amount of radiation that leaked from Fukushima Daiichi in the first week of the accident may have been more than double that initially estimated by Tepco.