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Japan’s Fukushima nuclear plant begins fuel rod removal via BBC News

Workers at Japan’s stricken Fukushima nuclear plant have begun removing fuel rods from a storage pond at the Unit 4 reactor building.

The delicate operation is seen as a necessary step in stabilising the site.

It will take about two days to remove the first 22 fuel rod assemblies, plant operator Tepco says.

Overall, more than 1,500 assemblies must be be removed in what correspondents describe as a risky and dangerous operation set to take a year.

Experts say hydrogen explosions after the earthquake and tsunami in March 2011 have made the current storage facility vulnerable to further tremors.

The fuel rod assemblies are four-metre long tubes containing pellets of uranium fuel, and the fear is that some may have been damaged during the disaster.

[...]

Removing fuel rods

  • The fuel rods – 4m-long tubes containing pellets of uranium fuel – are in a precarious state in the Unit Four storage pool
  • The rod assemblies will be lifted out in batches of 22 in casks filled with water, using a crane – each batch will take 7-10 days
  • Two critical issues are whether the rods were damaged during the disaster and so are likely to leak, and whether the casks remain watertight so the rods have no contact with air
  • The fuel rods will be deposited into a new “common” pool with a cooling system

[...]

Experts say it is vital that the casks are watertight so the rods have no contact with air – which risks overheating and possible contamination.

Yoshihide Suga, Japan’s top government spokesman, said he hoped the operation would go as planned.

“We hope that this [process] will be conducted in a manner that will not disturb local residents, and that the removal will be done on schedule, properly and safely,” he said.

Tepco spokesman Masayuki Ono called the operation “a very important process in moving ahead with the plant’s decommissioning”.

Nuclear Regulation Authority Chairman Shunichi Tanaka has warned that rubble from the blast in the pool could pose a problem, Kyodo news agency reported.

“The fuel has to be handled very carefully. There is a need to make sure that a fuel assembly is not pulled out (from the fuel rack) by force when it gets stuck because of the rubble,” Kyodo news agency quoted him as saying.

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