nuclear-news

The News That Matters about the Nuclear Industry Fukushima Chernobyl Mayak Three Mile Island Atomic Testing Radiation Isotope

Roof completed for removal of spent fuel rods at Fukushima plant

February 21, 2018
Work was completed Feb. 21 on a half-cylinder roof designed to trap radioactive substances emitted when spent fuel rods are removed from the No. 3 reactor building at the Fukushima No. 1 nuclear plant.
Tokyo Electric Power Co., the plant’s operator, plans to remove the spent fuel from the building’s storage pool as early as this autumn.
Construction work on the roof–23 meters wide and 57 meters long–started in July 2017.
The final piece, weighing about 55 tons, was lifted by a crane and put into place on Feb. 21. The roof is located directly above the storage pool.
A hydrogen explosion severely damaged the original roof of the No. 3 reactor building days after the March 2011 Great East Japan Earthquake and tsunami triggered the meltdowns at the plant.
The 566 fuel assemblies in the storage pool pose a serious risk in the event of another disaster striking the plant.
Completion of the roof should advance TEPCO’s plans to remove the fuel rods as soon as possible.
1.jpg
The final part of a roof is put in place on the top of the No. 3 reactor building at the Fukushima No. 1 nuclear power plant on Feb. 21.
2.jpg
A photo taken from an Asahi Shimbun helicopter on Feb. 21 shows the completion of work for a roof at the No. 3 reactor building of the Fukushima No. 1 nuclear power plant on Feb. 21.
3.jpg
The half-cylinder roof is designed to prevent radioactive substances from escaping during fuel-rod removal work in the No. 3 reactor building at the Fukushima No. 1 nuclear plant.

 

February 25, 2018 Posted by | Fukushima 2018 | , , | Leave a comment

Fukushima plant reactor #3 gets new roof cover

 

 
Workers at the crippled Fukushima Daiichi nuclear power plant have finished installing a new roof covering for the No.3 reactor building.
The work started last August to set up a dome-shaped cover. It is part of preparations for removing nuclear fuel from the reactor’s storage pool. A total of 566 spent and unused fuel units remain in the storage pool of the No. 3 reactor.
On Wednesday, workers installed the last part of the cover, which is 17 meters high and 22 meters wide, and weighs 55 tons.
The cover will prevent radioactive materials from spreading, and shield the building from winds.
Reactors at the Fukushima plant suffered meltdowns after a quake-triggered tsunami hit the plant on March 11th, 2011. The fuel units left in storage pools need to be removed as part of decommission work at the plant.
The plant’s operator, Tokyo Electric Power Company, will clear the pool of rubble and provide workers with training on remotely handling devices for the fuel removal.
Then, it plans to start removing nuclear fuel units from the No.3 reactor’s storage pool in autumn this year, ahead of those of other damaged reactors.

February 22, 2018 Posted by | Fukushima 2018 | , , | Leave a comment

Installation of Unit 3 fuel removal cover dome roof at Fukushima Daiichi

Tokyo Electric Power Co. shows its installation work to cover the upper part of the No. 3 nuclear reactor building that was blown off by the March 2011 hydrogen explosion at the Fukushima No. 1 nuclear power plant.

 

OKUMA, Fukushima Prefecture–Tokyo Electric Power Co. showed reporters its progress in installing a new roof above Fukushima No. 1 nuclear plant’s No. 3 reactor building on Aug. 2, ahead of work to remove spent nuclear fuel from a storage pool.

The company demonstrated how it is carrying out the work, which is necessary because the upper section of the reactor building was blown off in a hydrogen explosion in the nuclear disaster at the plant in March 2011.

The roof project marks a step toward removing nuclear fuel assemblies in the spent nuclear fuel storage pool in the building.

august 2 2017 new roof reactor 3.jpgA photograph taken from an Asahi Shimbun helicopter shows a section of the half-tubular shaped roof being installed over the No. 3 reactor building at the Fukushima No. 1 nuclear power plant on Aug. 2.

 

To prevent the spread of radioactive material, TEPCO started to set up the half-tubular shaped cover to shield the damaged reactor building at the end of last month.

new roof for reactor 3 august 2 2017 2.jpgA section of the roof is lifted by a crane to place it on top of the No. 3 nuclear reactor building at the Fukushima No. 1 nuclear power plant on Aug. 2.

 

new roof for reactor 3 august 2 2017 3An artist’s rendition of the completed roof that will shield the upper part of the No. 3 nuclear reactor building that was blown off in the March 2011 hydrogen explosion at the Fukushima No. 1 nuclear power plant.

 

The 566 nuclear fuel assemblies currently lying in the pool will become a significant risk if another major disaster strikes the area.

TEPCO is expected to start removing the fuel from around mid-fiscal 2018.

Early on Aug. 2, part of the roof measuring around 17 meters high and weighing 37 tons was lifted to the top floor of the reactor building with a large crane.

Workers connected the new part of the cover to another section that had been installed at the end of July, completing one eighth of the roof. When finished, it will be about 60 meters long.

Dedicated removal machines are needed to retrieve the fuel from the storage pool. The machines that had been used at the plant prior to the accident were removed because they were severely damaged by the hydrogen explosion.

http://www.asahi.com/ajw/articles/AJ201708020046.html

Source : Tepco

2017.7.31 Installation of Unit 3 fuel removal cover dome roof at Fukushima Daiichi Nuclear Power Station

http://www.tepco.co.jp/en/news/library/archive-e.html?video_uuid=z2v3h93c&catid=61785

Installation of Unit 3 spent fuel removal cover dome roof at Fukushima Daiichi Nuclear Power Station (On-site demonstration) Photos taken on: Aug 2, 2017

http://www.tepco.co.jp/en/news/library/archive-e.html?video_uuid=w8a3j0h4&catid=69631

August 3, 2017 Posted by | Fukushima 2017 | , , | Leave a comment