In the investigation of Unit 1 that caused a hydrogen explosion in the accident at the Fukushima Daiichi Nuclear Power Station, TEPCO released the latest video and deposited the deposits that may have melted down "fuel debris" at the bottom of the containment vessel. And near the entrance of the pipe, it was revealed that it was newly confirmed.
Last month, TEPCO confirmed the deposits that may be "fuel debris" in the investigation of Fukushima Daiichi Nuclear Power Plant Unit 1 near the structure supporting the reactor in the containment vessel, and from 14th this month, the camera We are continuing to investigate by introducing a robot with a fuel.
The latest video was released on the 24th, and deposits such as lumps and sand were confirmed near the bottom of the containment vessel and the entrance of the pipe, and deposits of about 1 meter covering a part of the equipment were also caught. ..
In addition, it was confirmed that bubbles were emitted from the piping connected to the "pressure suppression chamber" located under the containment vessel, and the nitrogen enclosed in the containment vessel to avoid the accumulation of hydrogen was used. I'm trying to find out.
TEPCO will introduce equipment that can detect neutrons next week to collect data in order to determine whether the deposit is "fuel debris".
At the Fukushima Daiichi nuclear power plant, meltdowns occurred at Units 1 to 3, and deposits that appear to be fuel debris have been confirmed at Units 2 and 3 so far.
TEPCO plans to continue the investigation and analyze the Unit 1 deposits in detail.