TOKYO (majirox news) — The Tokyo Electric Power Company (TEPCO) declared today that in the worst-case scenario, all the fuel rods in the Fukushima Daiichi power plant’s No. 1 reactor may have melted and fallen through to the bottom of the containment vessel. The bottom of the vessel is concrete topped with a steel plate.TEPCO and several research institutes studied the melting of fuel rods at three of the plant’s reactors. They based their analysis on temperatures, amounts of cooling water and other data.
According to TEPCO, the fuel may have eroded the bottom to a depth of 65 centimeters (26 inches), which took place immediately after the accident and almost completely melted down by the morning of March. 12. The thinnest part of the section is only 37 centimeters (14 inches) thick.
Up to 57 percent of the fuel in the plant’s No. 2 reactor and 63 percent in the No. 3 reactor may have melted, and that some of the melted fuel may have also dropped through reactor vessels.
This was another confirmation from TEPCO that meltdowns took place.