Status of Each Unit of the Fukushima Daiichi Nuclear Power Station

Shut down permanently on April 19, 2012.
The unit was operating when the earthquake struck on March 11, 2011.
The operators were able to achieve shutdown by inserting control rods.
When the tsunami hit, the unit lost power and the reactor could no longer be cooled. Moreover, a hydrogen explosion resulted in loss of the ability to contain radioactive materials. In preparation for fuel removal, we plan to construct a large cover that emcompasses the entire building and remove rubble from under the cover.

Shut down permanently on April 19, 2012.
The unit was operating when the earthquake struck on March 11, 2011.
The operators were able to achieve shutdown by inserting control rods.
When the tsunami hit, the unit lost power so that the reactor could no longer be cooled, and hydrogen was generated.
The hydrogen explosion in the adjoining Unit 1 building damaged part of the walls of the reactor building, which prevented an explosion in the Unit 2 building.
Based on the results of operating floor surveys, the method of removing fuel was revised. A new method was devised, by which the upper part of the reactor building will not be dismantled, and a fuel handling system consisting of an access gantry and front chamber is being built to take out the fuel via the south side of the building.

Shut down permanently on April 19, 2012.
The unit was operating when the earthquake struck on March 11, 2011.
The operators were able to achieve shutdown by inserting control rods.
When the tsunami hit, the unit lost power and the reactor could no longer be cooled. Moreover, a hydrogen explosion resulted in loss of the ability to keep radioactive materials enclosed.
Removal of fuel rod assemblies from the spent fuel pool was begun in April 2019, and all of them in the pool were taken out to the ouside of the building in February 2021, thereby greatlly reducing the risk.

Shut down permanently on April 19, 2012.
Operation was stopped for regular inspection when the earthquake struck on March 11, 2011.
For this reason, there was no fuel in the reactor at the time, while the nearby spent fuel storage pool in the building contained 1,535 fuel rod assemblies.
Although the building was damaged by the explosion of hydrogen entering through ducts from Unit 3, all the spent fuel was removed from the building by December 2014, greatly reducing any risk.

Shut down permanently on January 31, 2014.
Possible use for verification testing in research and development or other projects will be studied.

Shut down permanently on January 31, 2014.
Possible use for verification testing in research and development or other projects will be studied.

Images are streamed in real time from the side of Unit 1 and from the side of Unit 4.

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