Fukushima Nuclear Power Station Unit 2 top floor High radiation dose Inaccessible situation February 4 17:49

The NRA, which resumed investigating the cause of the accident at the Fukushima Daiichi Nuclear Power Station, announced the results of an investigation conducted last month on the top floor of the Unit 2 reactor building, and continued to generate more than 680 mSv / h. A high radiation dose has been measured.

The Nuclear Regulatory Commission has resumed an investigation to analyze the detailed situation and cause of the accident since October last year, as radiation levels at the Fukushima Daiichi nuclear power plant have decreased.

On the 4th, a study meeting with experts and others was held, and the results of the investigation conducted on the 30th of last month were announced on the top floor of the reactor building of Unit 2 that had melted down.

According to the result, the highest radiation level of 683 mSv / h was measured on the floor directly above the reactor as a result of measuring the radiation dose by the robot.

On this floor, TEPCO also conducted investigations after the accident and measured high radiation doses as well, so that even nine years after the accident, people remained inaccessible.

In addition, although the meltdown was not performed, a video of Unit 4 that caused a hydrogen explosion was also released, and the ceiling and other parts that seemed to have exposed the steel frame due to the explosion were shown, indicating the magnitude of the impact.

The Regulatory Commission intends to use such data not only for the cause and analysis of the accident, but also for the work required for decommissioning, and plans to compile the report in the meantime.