On 13th anniv, team studying heart of Fukushima plant
TOKYO: As Japan prepares to mark the 13th anniversary of its worst-ever nuclear disaster, the man in charge of cleaning it up says his team is fighting to bring a sample out of the heart of the site’s radioactive debris.
A decades-long project to clean up the remains of the Fukushima Daiichi nuclear power plant is preparing to remove damaged fuel debris from the plant’s reactors, but much about what’s inside them is still a mystery.
The key to unlocking that mystery and figuring out how to clean it up is a sample of melted fuel from inside a reactor, said Akira Ono, head of decommissioning for Tokyo Electric Power Company Holdings, in an interview. Getting that sample would be like penetrating “the main keep of the castle” in the battle of decommissioning, Ono said.
“We have achieved a number of things, but we still have a lot of thinking to do to tackle the unprecedented task of removing melted fuel.”
A magnitude 9.0 earthquake and tsunami on March 11, 2011, damaged the Fukushima Daiichi plant’s cooling systems, causing three of its reactors to meltdown, releasing radiation and driving thousands of residents from their homes. Some areas near the plant are still unlivable.
We still have a lot of thinking to do to tackle the unprecedented task of removing melted fuel
—Akira Ono, Head of decommissioning for TEPCO
About 880 tonnes of highly radioactive melted nuclear fuel remains inside the three damaged reactors, but no one knows what condition the melted fuel is in or exactly where in the reactors it fell, said Ono. Since a 2019 robot probe first looked inside the No. 2 reactor — the least damaged — TEPCO has been trying to extract a small amount of melted debris from it using a robotic arm.
That effort has been delayed for more than two years as the team works out how to get the robot past the wreckage. The team’s next attempt will come in October, using a previously tested device that resembles a fishing rod to get a preliminary sample out, while waiting technical improvements to the robotic arm, Ono said.
The plant made its first drone flight into the worst-hit reactor, No. 1 reactor, to investigate the melted debris, but had to cancel a second day of exploration after a secondary robot that helped with data transmission failed.