Tokyo Electric Power Company, or TEPCO, says a deadly level of radiation was detected during a remote-controlled inspection last month in the Unit 2 reactor at the crippled Fukushima Daiichi nuclear power plant.
TEPCO officials said on Thursday that during the probe in January, a maximum of 8 sieverts per hour of radiation was detected under the reactor in the containment vessel. Experts say exposure to such radiation for about an hour would be fatal.
The finding shows that nearly 7 years after meltdowns at the plant, radiation levels there remain so high that decommissioning work would be a big challenge.
TEPCO said it will use the latest data to draw up a plan to remove nuclear debris from the vessel.