Robot probes show Japan reactor cleanup worse than expected

Robot probes at one of Japan's wrecked Fukushima nuclear reactors have suggested worse-than-anticipated challenges for the plant's ongoing cleanup. The plant's operator Tokyo Electric Power Co. says the remote-controlled "scorpion" robot that was sent into a containment vessel Thursday to investigate the core area had failed while climbing over highly radioactive debris. The robot, carrying a dosimeter and two small cameras, transmitted some data and visuals but could not locate melted fuel ...