Daisuke Hirose, a Tepco spokesman, inside the Unit 5 reactor at the Fukushima nuclear power plant. Tepco used underwater robots that finally found the melted uranium fuel inside Unit 3, another reactor that was destroyed. By Martin Fackler. They had spent a month training for what they were about to do: pilot a small robot into the contaminated heart of the ruined Fukushima nuclear plant. Earlier robots had failed , getting caught on debris or suffering circuit malfunctions from excess radiation. The size of a shoe box , the Manbo used tiny propellers to hover and glide through water in a manner similar to an aerial drone.
Japan's Tepco to decommission second, undamaged Fukushima nuclear plant
Nuclear power in Japan - Wikipedia
As of February , there are 42 operable reactors in Japan. Of these, 9 reactors in 5 power plants are operating. Though all of Japan's nuclear reactors successfully withstood shaking from the Tohoku earthquake , flooding from the ensuing tsunami caused the failure of cooling systems at the Fukushima I Nuclear Power Plant on 11 March A comprehensive assessment by international experts on the health risks associated with the Fukushima I nuclear power plant disaster concluded in that, for the general population inside and outside Japan, the predicted risks were low and no observable increases in cancer rates above baseline rates were anticipated.
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At the time of the accident, only reactors 1—3 were operational, and reactor 4 served as temporary storage for spent fuel rods. TEPCO officials reported that tsunami waves generated by the main shock of the Japan earthquake on March 11, , damaged the backup generators at the Fukushima Daiichi plant. Although all three of the reactors that were operating were successfully shut down, the loss of power caused cooling systems to fail in each of them within the first few days of the disaster. Melted material fell to the bottom of the containment vessels in reactors 1 and 2 and bored sizable holes in the floor of each vessel—a fact that emerged in late May.