Fukushima-1 accident happened in March 2011. The impact of the tsunami after the earthquake disabled the power supply and cooling systems of the nuclear power plant. Three out of six reactors overheated – it led to the fact that the nuclear fuel melted and burned through the protective shells of the power units.
In the first power unit of the nuclear power plant, there were 392 fuel assemblies (FA), in the second – 615, in the third – 566. In each of them there was nuclear fuel in the form of hundreds of “tablets”. Molten, it mixed with concrete, metal and other materials inside the plants. In total, about 880 tons of waste remained in the three reactors.< /p>
The Japanese face the most difficult task – remove melted fuel from emergency power units and send it to disposal. It was originally planned to get it “dry” way with the help of robotic mechanisms. Now they want to do this by building a “water” sarcophagus. The operation of its construction is considered the most difficult part of the work to eliminate the consequences of the accident. The estimate for liquidation work, which now stands at $ 57.5 billion, will increase significantly.
See the aif.ru infographic to see how it will proceed  ;operation and what are the advantages of the proposed method.
Click to enlarge
Sources: TASS, Kyodo News, https://ru.wikipedia.org
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