TOKYO – A draft investigation report into the 2011 Fukushima nuclear meltdown, adopted by Japanese nuclear regulators Wednesday, says it has detected dangerously high levels of radioactive contamination at two of the three reactors, adding to concerns about decommissioning challenges.
The interim report said data collected by investigators showed that the sealing plugs sitting atop the No. 2 and 3 reactor containment vessels were as fatally contaminated as nuclear fuel debris that had melted and fell to the bottom of the reactors following the March 2011 tsunami and earthquake.
The experts said the bottom of the sealed plug, a triple-layered concrete disc-shaped lid 12 meters (39 feet) in diameter sitting atop the primary containment