TEPCO latest crisis hit when the struggle to stabilize power plant.
Upgrade and 55 nuclear plants in Japan has decided.
Japan dismantle the four reactors defective Fukushima Daiichi plant, affected by the earthquake and subsequent earthquake on March 11 last.
High levels of radioactive iodine, measured at sea near the Fukushima plant.
Radioactive iodine from the Fukushima nuclear power plant damages north-eastern Japan.
Radiation in water.