Regarding the deposits found inside the containment vessel of Fukushima Daiichi Nuclear Power Station Unit 1, TEPCO revealed that there is a high possibility of "fuel debris" in which melted nuclear fuel and structures are mixed, as a result of the investigation. Did.

In the future, we will investigate further and determine whether it is "fuel debris".

TEPCO will measure neutrons generated by nuclear fission from the middle of this month (May) to investigate whether the deposit in the containment vessel of Fukushima Daiichi Nuclear Power Plant Unit 1 confirmed in the investigation from February this year is "fuel debris". I put in a robot to do.

As a result, neutrons were detected at all four locations in the containment vessel where the measurements were taken, and among them, particularly high values ​​were measured near the opening of the "pedestal", the structure that supports the reactor.

"It is natural to think that the deposits contain fuel debris," TEPCO said, revealing that "fuel debris" is likely.

Extraction of "fuel debris" is considered to be the biggest difficulty in the decommissioning of the Fukushima Daiichi nuclear power plant, and TEPCO will use another robot to investigate the nuclides in detail and use a small amount as a sample in the future. It is supposed to be collected and analyzed.