600 tons of melted radioactive Fukushima fuel still not found, clean-up chief reveals
The Fukushima clean-up team remains in the dark about the exact
locations of 600 tons of melted radioactive fuel from three devastated
nuclear reactors, the chief of decommissioning told the ABC’s Foreign
Correspondent program in an exclusive interview.
The company hopes to
locate and start removing the missing fuel from 2021, the Tokyo Electric
Power Company's (TEPCO) chief of decommissioning at Fukushima, Naohiro
Masuda, revealed.The fuel extraction technology is yet to be elaborated upon, he added.
Following the tsunami-caused 2011 meltdown at Fukushima Dai-ichi nuclear power plant uranium fuel of three power generating reactors gained critical temperature and burnt through the respective reactor pressure vessels, concentrating somewhere on the lower levels of the station currently filled with water.
The melted nuclear fuel from Reactor 1 poured out completely, estimated 30 to 50 percent of fuel from Reactor 2 and 3 remained in the active zone, Masuda said.
The official estimates that approximately “200 tons of [nuclear fuel] debris lies within each unit," which makes in total about 600 tons of melted fuel mixed up with metal construction elements, concrete and whatever else was down there.
Five years after the Fukushima tragedy, the exact location of the highly radioactive “runaway” fuel remains mystery for TEPCO. The absolutely uncontrollable fission of the melted nuclear fuel assemblies continue somewhere under the remains of the station.
“It's important to find it as soon as possible,” acknowledged Masuda, admitting that Japan does not yet possess the technology to extract the melted uranium fuel.
“Once we can find out the condition of the melted fuel and identify its location, I believe we can develop the necessary tools to retrieve it,” Masuda said.
TEPCO’s inability to locate the melted fuel could be explained by huge levels of radiation near the melted reactor shells. It is so high that even custom-built robots sent there to get information about the current state of affairs there get disabled by the tremendous radioactivity flux. Human presence in the area is understandably out of the question.
The company’s decommission plan for Fukushima nuclear power plant implies a 30-40 year period before the consequences of the meltdown are fully eliminated. Yet experts doubt the present state of technology is sufficient to deal with the unprecedented technical task.
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