Tokyo Electric Power Co.9501.TO -2.78% said it has confirmed for the first time that the No. 1 reactor at the stricken Fukushima Daiichi nuclear power plant melted down during the devastating accident four years ago.
Tepco said Thursday that x-ray-like images taken inside the reactor showed that nearly all of the nuclear fuel had melted down, and nothing could be seen where the fuel rods should be. The findings were largely expected.