The company in charge of the crippled Fukushima Daiichi nuclear plant says a broken cable has hampered its operation to send a probe into a reactor.
Tokyo Electric Power Company on Tuesday began preparations to put the remote-controlled robot into the No.1 reactor's containment vessel. Molten nuclear fuel is believed to be at the bottom of the vessel.
But the company called off the work because images from a camera placed outside the vessel to monitor the robot were not available.
TEPCO engineers say the cable connecting the camera to the monitor screen was broken.
They say they will spend several days from Thursday to replace the cable and do other necessary work before sending the probe into the vessel.