Asahi Shimbun, Mar 24, 2017: Some Nuclear Regulation Authority members are skeptical of continuing to send robots into reactors in the crippled Fukushima No. 1 nuclear plant… These regulators are increasingly calling for a new survey methodology after recent investigations utilizing robots controlled remotely generated few findings and were quickly terminated… The lower part of the reactor’s containment vessel is submerged in water where deposits of fuel debris are believed to reside below the surface after melting through… TEPCO and the government… have yet to collect information on the location, amount and condition of the melted fuel… [T]he surveys centering around the robots so far have failed to produce meaningful results.
Asia Times, Mar 10, 2017: The robots are part of an unprecedented task, challenging engineers to come up with technology that doesn’t exist to deal with a nuclear disaster the likes of which has never been known.