The operator of the Fukushima Daiichi nuclear plant has revealed new video footage of what is believed to be fuel debris in a failed reactor unit.
In a probe conducted on Friday, Tokyo Electric Power Company confirmed that material at the bottom of the Unit 2 reactor containment vessel appears to be a mixture of melted nuclear fuel and structure parts.
The video released on Monday shows cooling water falling like rain onto brown deposits that look like pebbles. A handle of a fuel assembly unit can also be seen resting on the deposits.
It is unknown how the handle came to be there, as no large hole has been found at the reactor's bottom.
The operator says the Unit 2 interior appears less damaged than that of Unit 3.
With the new information, the company will study how the meltdown occurred. Past simulations indicate that some fuel leaked from the Unit 2 reactor and reached the containment vessel. But much of the fuel is believed to remain inside the reactor.
Tokyo Electric Power Company says the new footage has provided useful data for determining how to advance the cleanup work.