‘Nervous and rushed’: Massive Fukushima plant cleanup work involves high radiation and stress

Experts say the hard work and huge challenges of decommissioning the plant are just beginning. There are estimations that the work could take more than a century. The government and TEPCO have an initial completion target of 2051, but the retrieval of melted fuel debris is already three years behind, and many big issues remain undecided.

By ASSOCIATED PRESS, 12 March 2025

OKUMA, Japan (AP) – The Fukushima Daiichi nuclear power plant’s radiation levels have significantly dropped since the cataclysmic meltdown in Japan 14 years ago. Workers walk around in many areas wearing only surgical masks and regular clothes.

It’s a different story for those who enter the reactor buildings, including the three damaged in the 2011 earthquake and tsunami. They must use maximum protection – full facemasks with filters, multi-layered gloves and socks, shoe covers, hooded hazmat coveralls and a waterproof jacket, and a helmet.

As workers remove melted fuel debris from the reactors in a monumental nuclear cleanup effort that could take more than a century, they are facing both huge amounts of psychological stress and dangerous levels of radiation.

The Associated Press, which recently visited the plant for a tour and interviews, takes a closer look.

A remote-controlled extendable robot with a tong had several mishaps including equipment failures before returning in November with a tiny piece of melted fuel from inside the damaged No. 2 reactor.

That first successful test run is a crucial step in what will be a daunting, decades-long decommissioning that must deal with at least 880 tons of melted nuclear fuel that has mixed with broken parts of internal structures and other debris inside the three ruined reactors…………………………………………………

Radiation levels are still dangerously high inside the No. 2 reactor building, where the melted fuel debris is behind a thick concrete containment wall. Earlier decontamination work reduced those radiation levels to a fraction of what they used to be.

In late August, small groups took turns doing their work helping the robot in 15- to 30-minute shifts to minimize radiation exposure. They have a remotely controlled robot, but it has to be manually pushed in and out.

“Working under high levels of radiation (during a short) time limit made us feel nervous and rushed,” said Yasunobu Yokokawa, a team leader for the mission. “It was a difficult assignment.”

Full-face masks reduced visibility and made breathing difficult, an extra waterproof jacket made it sweaty and hard to move, and triple-layered gloves made their fingers clumsy, Yokokawa said.

To eliminate unnecessary exposure, they taped around gloves and socks and carried a personal dosimeter to measure radiation. Workers also rehearsed the tasks they’d perform to minimize exposure…………………………………………………..

a growing number of workers are concerned about safety and radiation at the plant, said Ono, the decommissioning chief, citing an annual survey of about 5,5,00 workers……

Yokokawa and a plant colleague, Hiroshi Ide, helped in the 2011 emergency and are team leaders today. They say they want to make the job safer as workers face high radiation in parts of the plant.

On the top floor of the No. 2 reactor, workers are setting up equipment to remove spent fuel units from the cooling pool. That’s set to begin within two to three years.

At the No. 1 reactor, workers are putting up a giant roof to contain radioactive dust from decontamination work on the top floor ahead of the removal of spent fuel.

To minimize exposure and increase efficiency, workers use a remote-controlled crane to attach pre-assembled parts, according to TEPCO. The No. 1 reactor and its surroundings are among the most contaminated parts of the plant.

Workers are also removing treated radioactive wastewater. They recently started dismantling the emptied water tanks to make room to build facilities needed for the research and storage of melted fuel debris.

After a series of small missions by robots to gather samples, experts will determine a larger-scale method for removing melted fuel, first at the No. 3 reactor.

Ide, whose home in Namie town, northwest of the plant, is in a no-go zone because of nuclear contamination, still has to put on a hazmat suit, even for brief visits home…….
https://www.dailymail.co.uk/wires/ap/article-14484347/Nervous-rushed-Massive-Fukushima-plant-cleanup-exposes-workers-high-radiation-stress.html