The Nuclear Regulatory Commission, which resumed the investigation of the cause of the accident at the Fukushima Daiichi Nuclear Power Station from last year, will present a draft report on the 18th and will compile it as a formal report within the fiscal year.
The accident at TEPCO's Fukushima Daiichi Nuclear Power Plant, which will be 10 years in March next year, caused a meltdown and hydrogen explosions occurred in three reactor buildings.
The Nuclear Regulatory Commission, which resumed investigations into the causes of the accident last year, presented a draft report on the 18th.
Among these, as a result of analyzing the video of Unit 3 about the details of the hydrogen explosion that was not well understood so far, it is estimated that combustion by unburned hydrogen and flammable gas occurred continuously after the first explosion. And.
However, it is not known at this time where the flammable gas came from.
In addition, the whereabouts of some of the radioactive materials in the three reactors that caused the meltdown are unknown, but during the investigation, a large amount of them adhered to the back side of the lid above the reactors. It is said that it will lead to the elucidation of the actual situation of how the radioactive material leaked out.
In addition, at the time of the accident, three reactors tried "venting" to release the gas inside, but it is possible that some of the gas flowed back into the building.
The Regulatory Commission will compile a formal report by the end of the year.