TOKYO: A difficult operation to remove a small piece of radioactive debris from Japan’s stricken Fukushima nuclear plant using a robotic device was completed successfully, the plant operator said Thursday, after technical issues halted earlier attempts.
Extracting the estimated 880 tonnes of highly radioactive fuel and debris from Fukushima remains the most challenging part of the decades-long decommissioning process.
But radioactivity levels inside the former power station, which went into meltdown in 2011 after being hit by a catastrophic tsunami, are too high for humans to enter.
So engineers used a specially developed extendible robotic device to remove a sample with a diameter of five millimeters (0.2 inches), aiming to study it for clues about conditions inside the stricken reactors.
The trial debris removal began in September, after an initial attempt in August was suspended at an early stage over a problem with the equipment’s installation.
Another technical snag related to cameras on the apparatus caused a pause of over a month before the procedure resumed in late October.
On Thursday, plant operator TEPCO said it had “completed the trial removal of fuel debris,” declaring the operation a success after several complex steps.
Over the weekend, the robot managed to remove a piece of debris from a containment vessel surrounding a damaged reactor for the first time.
Technicians then tested the radiation level of the sample on Tuesday and put it in a special container.
It will be sent to research institutes in Ibaraki north of Tokyo for analysis, a TEPCO spokeswoman said, adding that the company is still studying when it will be able to start the full-fledged removal of the radioactive debris.
Three of Fukushima’s six reactors were operating when the tsunami hit on March 11, 2011, triggering the worst nuclear disaster since Chernobyl.
Japan last year began releasing into the Pacific Ocean some of the 540 Olympic swimming pools’ worth of treated reactor cooling water amassed since the disaster.
The step sparked a diplomatic row with China and Russia, both of which banned seafood imports, although Japan insists the discharge is safe, a view backed by the UN atomic agency.
Beijing, however, said in September it would “gradually resume” importing seafood from Japan after imposing the blanket ban.

MANILA: The Philippines has evacuated thousands of people from coastal communities ahead of a major typhoon, officials said Thursday, just weeks after a tropical cyclone left at least 150 people dead.
Packing maximum sustained wind speeds of 175 kilometers (109 miles) per hour, Typhoon Yinxing could make landfall in the northern Philippines later in the day or early Friday, the state weather agency said.
Yinxing is the third storm in less than a month to threaten the Philippines after Severe Tropical Storm Trami and Super Typhoon Kong-rey together left 158 people dead, the national disaster agency said, with most of that tally attributed to Trami.
At least 17,000 people from coastal areas of Cagayan province, in the country’s far north, moved into temporary shelters on Wednesday to avoid potential flooding from heavy rains now pounding the region, provincial rescue official Rueli Rapsing told AFP.
“I’m expecting more evacuees to arrive since there is an ongoing evacuation in the municipalities,” Rapsing said.
The national weather agency said Cagayan, home to about 1.3 million people, might bear the brunt of Yinxing based on its current trajectory.
“We have already depleted the quick response fund of the province and we’re actually asking the national disaster council for the replenishment of the quick response fund so we can provide assistance,” Rapsing said.
In Ilocos Norte province near Cagayan, rescuers were on standby to help local police, fire officers and soldiers in emergency response, provincial rescue official Randy Nicolas told AFP.
Nicolas said they are closely monitoring possible landslides, floods and swelling of rivers in the province, with storm surges — huge waves along the coast, also a concern in Ilocos Norte and Cagayan.
Disaster officials in the mountainous province of Apayao said almost 500 people have been evacuated.
“We really prioritized preemptive evacuations because we want to have zero deaths here in Apayao,” provincial disaster official Aldrin Agmata told AFP.
School has been suspended in many areas of the north and President Ferdinand Marcos put all government agencies on high alert so they can swiftly respond.
“Remember, every life is important so we should always be prepared,” Marcos said in a statement on Wednesday.