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Fukushima nuclear clean-up delayed as new radioactive contamination found

Newly found Fukushima plant contamination may delay cleanup as thousands still unable to return home https://www.9news.com.au/world/japan-nuclear-explosion-new-fukushima-plant-contamination-fears-leave-thousands-unable-to-return/afae1775-bcbf-472a-98a0-313efc1e7335, By Associated Press Jan 27, 2021 A draft investigation report into the 2011 Fukushima nuclear meltdown, adopted by Japanese nuclear regulators on Wednesday, says it has detected dangerously high levels of radioactive contamination at two of the three reactors, adding to concerns about decommissioning challenges.

The interim report said data collected by investigators showed that the sealing plugs sitting atop the Number Two and Number Three reactor containment vessels were as fatally contaminated as nuclear fuel debris that had melted and fell to the bottom of the reactors following the March 2011 tsunami and earthquake.
The experts said the bottom of the sealed plug, a triple-layered concrete disc-shaped lid 12 metres in diameter sitting atop the primary containment vessel, is coated with high levels of radioactive Cesium 137.
The Number One reactor lid was less contaminated, presumably because the plug was slightly knocked out of place and disfigured due to the impact of the hydrogen explosion, the report said.
The experts measured radiation levels at multiple locations inside the three reactor buildings, and examined how radioactive materials moved and safety equipment functioned during the accident.
They also said venting attempt at Unit Two to prevent reactor damage never worked, and that safety measures and equipment designs still need to be examined.
The lid contamination does not affect the environment as the containment vessels are enclosed inside the reactor buildings.
The report did not give further details about if or how the lid contamination would affect the decommissioning progress.
Nuclear Regulation Commission Chairman Toyoshi Fuketa called the findings “extremely serious” and said they would make melted fuel removal “more difficult.”
He said figuring out how to remove the lids would be a major challenge.
Removing an estimated 900 tons of melted fuel debris from three reactors is a daunting task expected to take decades, and officials have not been able to describe exactly when or how it may end.
The Fukushima plant was to start removing melted fuel debris from Unit Two, the first of three reactors, later this year ahead of the 10th anniversary of the accident.
But in December, plant operator Tokyo Electric Power Co. and the government announced a delay until 2022.
They said the development of a robotic arm for the debris removal — a joint project with Britain — has been delayed due to the pandemic.
Under the current plan, a remote-controlled robotic arm will be inserted from the side of the reactor to reach the molten fuel mixed with melted parts and concrete floor of the reactor.
Eventually the lids also would have to be removed, but their contamination is a major setback.
The team of experts entered areas inside the three reactors that were previously highly contaminated and inaccessible after radiation levels came down significantly.
They’re seeking data and evidence before they get lost in the cleanup.
Massive radiation from the reactors has caused some 160,000 people to evacuate from around the plant.
Tens of thousands are still unable to return home.

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January 28, 2021 - Posted by Christina MacPherson | Fukushima continuing

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