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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

Contaminated Water Issue

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 More than 87% of the approximately 600,000 tons of water in the tanks has already been processed.
The decontamination process will be completed using strontium removal equipment at least once by the end of May 2015, except for the water contaminated during the initial period of the accident itself (approx. 20 thousand tons), which is mixed with seawater.
The water which has undergone strontium removal will then also be treated by the multi-nuclide removal equipment as the second decontamination process. (The process is estimated to be finished in about one year following the completion of decontamination of the contaminated water stored in the tanks.)
Removal of highly contaminated water in the underground tunnels (trenches) on the sea side of the building Ongoing Half of the 11,200 tons of highly contaminated water in the trenches was removed by FY 2014.
Removal of all of the water is expected to be completed in June 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
Pumping started in late May 2014. The amount of water being contaminated has dropped from approx. 400 m3/day to approx. 300 m3/day.
Pumping of ground water from wells around buildings (sub-drains) and draining of the water to the sea after decontamination Ongoing Explanation to stakeholders is ongoing. Drainage of the water to the sea will not start without their consent.
Installation of land-side impermeable frozen walls Ongoing Construction started in June 2014. A freezing operation is planned, starting sequentially from the land-side. (99% of the construction on the land-side is completed.)
Waterproof pavement to prevent groundwater inflow Ongoing Pavement was completed, excluding high dose sites and those where specific construction-related management procedures are needed, by FY 2014 (approximately 70%).
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 Ongoing More than 90% of the construction is completed.
Increase the number of tanks In operation (under further maintenance) 800,000 tons of tank capacity were secured by FY 2014, two years earlier than the time projected in the Mid- and Long-Term Roadmap.

Mid-and-Long-Term Roadmap

Revised in June 2013

Revised in July 2012

Adopted in December 2011

Progress Status Reports (monthly)


Other Information

Division in Charge

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

Last updated:2015-04-24
Ministry of Economy, Trade and Industry
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