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Mid-and-Long-Term Roadmap towards the Decommissioning of TEPCO's Fukushima Daiichi Nuclear Power Station Units 1-4

What's New

Current Status of Fukushima Daiichi NPS

Videos: Fukushima Today 2019

Cooperation with IAEA

General Conference 2019 – Side event -

ALPS treated Water Issue

“ALPS treated water” (not equals to “contaminated water”) is being continuously stored on the site.

The Subcommittee on Handling ALPS Treated Water (Japanese)

Tritiated Water Task Force (2013-2016)

Countermeasures to Manage Contaminated Water

Water for cooling fuel debris touches that debris, and thereby becomes highly contaminated water containing highly concentrated radioactive materials.

New contaminated water is generated due to mixing of this highly contaminated water with groundwater and rainwater that flow into buildings.

Countermeasures to Manage Contaminated Water: Measures and Progress
  Measures Progress
Remove contamination source Decontamination of contaminated water using multi-nuclide removal equipment, etc. (equipment for removing radionuclides from contaminated water) In operation The water which has undergone strontium removal will then also be treated by the multi-nuclide removal equipment as the second decontamination process.
Removal of highly contaminated water in the underground tunnels (trenches) on the sea side of the building Completed Removal of the highly contaminated water from the trenches and filling the trenches with filling material were completed in August 2015.
Isolate water from contamination Pumping from the well on the land-side of the building into the sea (groundwater bypassing system) Completed / In operation Drainage started in late May 2014.
Pumping of ground water from wells around buildings (sub-drains) and draining of the water to the sea after decontamination Completed / In operation Drainage of water started on September 14, 2015.
Installation of land-side impermeable frozen walls Completed / In operation Freezing operation started in March 2016.
Completed in September 2018
Waterproof pavement to prevent groundwater inflow Ongoing Paving of the FY2015 target areas, accounting for 90% of the planned site, completed as scheduled.
Prevent leakage of contaminated water Heightening and doubling of tank fences Completed /
In operation
Completed in the middle of July 2014.
Their efficacy was proved when a typhoon struck in the autumn of 2014.
Ground improvement by sodium silicate (water glass) Completed /
In operation
Completed in March 2014.
Installation of sea-side impermeable walls Completed Sea-side impermeable walls were completed in October 2015.
Increase the number of tanks In operation (under further maintenance) 1,370,000 tons of tank capacity was secured by end of 2020.

Click the map for details.

Removal of highly contaminated water in the trenches Soil enhancement with sodium silicate Multi-unclide Removal Equipment, etc.Countermeasures to Manage Contaminated Water - map

Environmental Monitoring

Efforts made for decommissioning

What is decommissioning of the Fukushima Daiichi Nuclear Power Station?

Efforts are focused primarily on the following 4 types of work.

Decommissioning will be carried out safely and steadily over 30 to 40 years

Mid-and-Long-Term Roadmap towards the Decommissioning of TEPCO's Fukushima Daiichi Nuclear Power Station (September 26, 2017)

Current situation at each unit

Technological development for decommissioning

R&D toward retrieval of Debris

To see detailed information for each technology, click the boxes.

Decontamination and reducing radiation exposure Internal Investigation of Nuclear Reactors Repair of Containment Vessels Ascertaining of the Property of the Debris Retrieval of Debris

Other Efforts for Decommissioning

Development of a Research Base

In order to establish technological infrastructure for the development and demonstrations of remotely controlled equipment indispensable for proceeding with the decommissioning of Fukushima Daiichi NPS, and for the research and analysis of radioactive materials, as well as to facilitate joint research with domestic and foreign research institutes, develop a base for related research activities within Fukushima prefecture

Efforts for Decommissioning

To see detailed information for each technology, click the boxes.

Detailed analysis results regarding the water quality of the groundwater being pumped out for by-passing and by sub-drains at Fukushima Daiichi Nuclear Power Station

Progress Status of Fukushima Daiichi NPS (monthly)

Other Information

Division in Charge

Nuclear Accident Response Office, Electricity and Gas Industry Department, Agency for Natural Resources and Energy

Last updated:2019-11-15