Dose levels in the vicinity
μSv/h
What kind of work is being done at Unit 4?
During the accident, hydrogen generated at Unit 3 flowed through pipes into Unit 4 and caused a hydrogen explosion.
Since the reactor had been shut down for periodic inspection, all the reactor fuel was in the spent fuel pool.
Removal of the 1,535 fuel assemblies stored in the spent fuel pool was completed in 2014. This fuel is being stored in
the common pool thereby eliminating associated risks.
What is this gray frame?
It is a cover installed to aid with the removal of fuel from Unit 4.
The frame is made from strong steel beams that support the overhead crane required for removal.
Approximately 4,000t of steel beams in total was used for the structure. That’s the same amount that was used for Tokyo
Tower.
This frame was designed to prevent loads from being transferred to the damaged reactor building.
What changes has Unit 4 undergone since the accident?
Where are the removed fuel assemblies taken?
They are taken to the common pool, etc. located on-site and stored appropriately in water.
View Map
- Guide 01Entrance to 1F
- Guide 02Site-only vehicles
- Guide 03High ground in front of reactor buildings
- Guide 04Unit 1
- Guide 04Q&A for Unit 1
- Guide 05Unit 2
- Guide 05Q&A for Unit 2
- Guide 06Unit 3
- Guide 06Q&A for Unit 3
- Guide 07Unit 4
- Guide 07Q&A for Unit 4
- Guide 08Facing
- Guide 09Near the Units 2 and 3
- Guide 10Unit 5
- Guide 10Inside the Unit 5
Reactor Building (360°)
- Guide 11Inside the Primary Containment Vessel
- Guide 11Q&A for Inside the Primary Containment Vessel(360°)
- Guide 12Fuel debris investigation
- Guide 13Unit 1/2 Main control room
- Guide 13Q&A for Unit 1/2 Main control room (360°)
- Guide 14Unit 1/2 exhaust stack
- Guide 15Fuel removal
- Guide 15Q&A for Common pool(360°)
- Guide 16Contaminated water countermeasures
- Guide 16Q&A for Freezer Room (360°)
- Guide 17Tank area
- Guide 17Q&A for Tank area
- Guide 18Overview of ALPS treated water discharge
- Guide 19Multi-nuclide Removal Equipment (ALPS)
- Guide 19Q&A for Multi-nuclide Removal Equipment(360°)
- Guide 20Measurement/Confirmation Facility
- Guide 21Dilution facility and discharge facility
- Guide 21Q&A for Emergency isolation valve(360°)
- Guide 22Sea area monitoring
- Guide 23Marine organisms rearing test
- Guide 24Chemical analysis building
- Guide 25JAEA The Facility for Analysis and Research of Radioactive Materials Laboratory-1
- Guide 26Countermeasures against natural disaster
- Guide 27Main Anti-Earthquake Building
- Guide 28Site preparation for waste treatment facilities
- Guide 29Large rest house
- Guide 30New administration office building
- Guide 31IAEA office
