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TEPCO to launch another attempt to remove debris from Fukushima Daiichi Unit 3 spent fuel pool
Topic Started: 30 Jul 2015, 10:52 PM (166 Views)
skibboy
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TEPCO to launch another attempt to remove debris from Fukushima Daiichi Unit 3 spent fuel pool

30 JUL 2015

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Fukushima Daiichi Unit 3 Spent Fuel Pool - March 2013

Tokyo Electric has announced a new plan to attempt to retrieve the fuel handling machine that fell into the Fukushima Daiichi Unit 3 spent fuel pool.

TEPCO has been working to remove the fuel handling machine from the spent fuel pool in parts.

Previous attempts to retrieve debris from the spent fuel pool were halted after dislodging debris which fell back into the pool and oil was found to be leaking from some of the parts collected.

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A computer-generated image of the Fukushima Daiichi Unit 3 spent fuel pool from above

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The fuel handling machine, as seen from the south, is resting on the spent fuel racks.

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Both cranes will be attached to the fuel handling machine.

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The fuel handling machine will be removed at the same angle it is resting in the spent fuel pool.

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Image showing lifting of fuel handling machine.

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TEPCO plans to use two remote-controlled cranes to remove the fuel handling machine, which is currently resting on top of the spent fuel racks in the spent fuel pool.

Source: Posted Image
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skibboy
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Workers remove fuel exchanger at Fukushima Daiichi

Aug. 2, 2015

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Workers at the Fukushima Daiichi nuclear power plant have successfully removed a 20-ton device from the Number 3 reactor building.

The fuel exchanger fell into the fuel pool on the top floor when the reactor building exploded during the 2011 disaster.

The device was used to move nuclear fuel in and out of the pool.

The removal of the fuel exchanger started on Sunday morning and took 7 hours to complete.

As the site is highly radioactive, workers watched camera footage, and used 2 remote-controlled cranes to carry out the task.

The 566 fuel rod assemblies in the spent fuel pool of the Number 3 reactor building could have suffered damage if the device had fallen back in during the removal procedure.

The other decommissioning work at the plant was suspended during the removal to secure the safety of the workers.

The plant's operator, Tokyo Electric Power Company, says there were no major problems, and the amount of radioactive substances at Fukushima Daiichi has not changed.

The removal of spent fuel is the first major challenge for the decommissioning of the plant, which will take an estimated 40 years to complete.

But the large amount of debris and the high levels of radiation have kept spent fuel from being removed from the Number 1, 2 and 3 reactor buildings.

The removal of the fuel exchanger is a major step forward, but the removal of spent fuel will not start until 2017, or 2 years behind schedule, as it will take a long time to remove the debris and decontaminate the area.

The current roadmap says the removal of spent fuel will start in 2021.

However, TEPCO has not been able to determine the location of the spent fuel rods that melted and fell, and has yet to start developing technologies to remove them.

Many issues remain before the buildings are demolished and the decommissioning work is completed.

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Edited by skibboy, 2 Aug 2015, 10:02 PM.
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