Tokyo Electric Power Company has sent its swimming robot into the remains of the Fukushima nuclear power plant for a second time , in a bid to assess the damage to the reactor core . The robot has found large deposits of potential melted nuclear fuel , some as much as a metre deep , inside " the pedestal " , a structure that sits beneath the reactor core in the reactor 's primary cooling vessel . The deposits , which are mixed in with broken radioactive debris , are now submerged in highly radioactive debris .
Tokyo Electric Power Company has sent its swimming robot into the remains of the Fukushima Daiichi power plant for a second time, in a bid to assess the damage to the three reactors. The robot has found large deposits of potential melted nuclear fuel, some as much as a metre deep, inside "the pedestal", a structure that sits beneath the reactor core in the plant's primary containment vessel. The deposits, which are mixed in with broken reactor debris, are now submerged in highly radioactive water.