The concrete support foundation for a reactor whose core melted down at the Fukushima No. 1 nuclear power plant has deteriorated so much that reinforcing bars (rebars) are now exposed. Masao ...

An 8.5-meter-tall cylindrical pedestal made of concrete supports the reactor’s 440-ton pressure vessel. Its external diameter is 7.4 meters. The lower portion of the pedestal wall is around 1.2 ...