ALPS Treated Water
The Advanced Liquid Processing System (ALPS), a multi-nuclide removal system, removes various radioactive materials from contaminated water.
Outline of ALPS treated water
Basic Policy
Related Documents
International Atomic Energy Agency (IAEA)
- The IAEA Conducted the Fourth Review Mission on the Safety of the Discharge of ALPS Treated Water into the Sea since the Start of the Discharge into the Sea (May 30, 2025）
- As a Part of Additional Measures under the IAEA Framework, ALPS Treated Water Diluted with Seawater was Sampled on the Premises of TEPCO’s FDNPS for the First Time (April 15, 2025)
- The IAEA Published a Report on its Third Review Mission of Safety Related Aspects of the Discharge of ALPS Treated Water into the Sea after the Start of the Discharge (March 25, 2025)
- The IAEA Published a Report on the Third Interlaboratory Comparison on the Determination of Radionuclides in ALPS Treated Water (March 25, 2025)
- The IAEA Published a Report on “Corroboration of Internal Exposure Monitoring” for Workers as Part of the Review of Safety Related Aspects of Handling ALPS Treated Water (March 25, 2025)
- As a Part of Additional Measures under the IAEA Framework, ALPS Treated Water was Sampled on the Premises of TEPCO’s FDNPS for the First Time (February 21, 2025)
- Minister Muto Holds Meeting with IAEA Director General Grossi (February 20, 2025)
- The IAEA Conducted a Review Mission on the Safety of the Discharge of ALPS Treated Water (December 13, 2024)
- The IAEA Published a Report for “Corroboration of External Exposure Monitoring” for Workers as Part of the Review of Safety Related Aspects of Handling ALPS Treated Water（November 12, 2024）
- Reconstruction and Decommissioning in Fukushima- Side Event of IAEA General Conference 2024 (September 17, 2024)
- The IAEA Published a Report on Its Second Review Mission of Safety Aspects of Handling of ALPS Treated Water at Fukushima Daiichi Nuclear Power Station since the Start of the Discharge in April 2024 (July 18, 2024)
- Minister Saito Holds Meeting with H.E. Mr. Rafael Mariano Grossi, Director General of the International Atomic Energy Agency (IAEA) (March 12, 2024)
- IAEA Officials will Visit TEPCO’s Fukushima Daiichi Nuclear Power Station to Observe Sampling of the ALPS Treated Water for Analysis (February 28, 2024)
- The IAEA Published a Report on Its First Review Mission of Safety Aspects of Handling of ALPS Treated Water at Fukushima Daiichi Nuclear Power Station since the Start of the Discharge in October 2023 (January 30, 2024)
- The IAEA Published Results for Second Interlaboratory Comparison on the Determination of Radionuclides in ALPS Treated Water (January 30, 2024)
- The IAEA Conducted a Review Mission Regarding the Safety of the Discharge of ALPS Treated Water from TEPCO’ Fukushima s Daiichi Nuclear Power Station into the Sea (October 27, 2023)
- State Minister Iwata Holds a Conference with Ms. Lydie Evrard, Deputy Director General of the International Atomic Energy Agency (IAEA) (October 19, 2023)
- State Minister Sakai Attends the 67th General Conference of the International Atomic Energy Agency (IAEA) (September 27, 2023)
- Minister Nishimura Holds a Video Conference with H.E. Mr. Rafael Mariano Grossi, Director General of the IAEA (August 25, 2023)
- Minister Nishimura Holds a Conference with H.E. Mr. Rafael Mariano Grossi, Director General of the IAEA (July 4, 2023)
- Publication of the IAEA Comprehensive Report on the Safety Review of the ALPS Treated Water at the TEPCO’s Fukushima Daiichi nuclear Power Station (July 4, 2023)
- IAEA Officials and International Experts to Visit Japan on a Comprehensive Mission to Review the Discharge of ALPS Treated Water from TEPCO’s- Fukushima Daiichi Nuclear Power Station into the sea (May 26, 2023)
- Minister Nishimura Holds a Video Conference with H.E. Mr. Rafael Mariano Grossi, Director General of the IAEA (April 20, 2023)
- The IAEA Published a Report on Its Second Review Mission of Safety Aspects of Handling of ALPS Treated Water at Fukushima Daiichi Nuclear Power Station in November 2022 (April 6, 2023)
- The IAEA Published a Report on "IAEA’s Independent Sampling, Data Corroboration, and Analysis Activities" from Its Review of Safety Related Aspects of Handling ALPS Treated Water at TEPCO's Fukushima Daiichi Nuclear Power Station (January ４, 2023)
Status of studies on the handling of ALPS treated water
Related Documents
The Inter-Ministerial Council concerning the Continuous Implementation of the Basic Policy on Handling of ALPS Treated Water
- Action Plan for the Continuous Implementation of the Basic Policy on Handling of ALPS Treated Water（August 2023）(PDF:2,442KB)
- Actions and future measures regarding Basic Policy (outline) (August 22, 2023)(PDF:318KB)
- Actions and future measures regarding “Basic Policy on handling of ALPS treated water at the Tokyo Electric Power Company Holdings’ Fukushima Daiichi Nuclear Power Station” (August 22, 2023)(PDF:238KB)
- Action Plan for the Continuous Implementation of the Basic Policy on Handling of ALPS Treated Water (August 30, 2022)(PDF:509KB)
- Concept to strengthen and expand measures on handling of ALPS treated water at TEPCO’s Fukushima Daiichi Nuclear Power Station (August 30, 2022)(PDF:247KB)
Team for Contaminated Water and Decommissioning Issues
The Subcommittee on Handling ALPS treated water
- The Subcommittee on Handling of the ALPS treated water Report（February 10, 2020）(PDF:2,246KB)
- The Outline of the report of the Subcommittee on handling of ALPS treated water (February 10, 2020）(PDF:1,743KB)
Tritiated Water Task Force (2013-2016)
ALPS treated water Q&A
Here, we will answer the questions of ALPS treated water.
If you have questions, please check the answer!
＜“treated water” and “contaminated water”＞
Q1: What is “ALPS treated water”?
Q2: Why is “contaminated water” generated?
＜Characteristics of the ALPS treated water＞
Q3: What is tritium?
Q4: Can tritium be removed?
Q5: Does the treated water contain radioactive materials other than tritium?
＜Handling of the ALPS treated water＞
Q6: Why is discharge of ALPS treated water needed?
Q7: Why was Discharge into the sea selected as the method of disposal?
Q8: Is it possible to store or discharge treated water outside of Fukushima Daiichi NPS (FDNPS)？
Q9: Is it possible to store in intermediate storage facilities?
＜Radiation impact of ALPS treated water＞
Q10: What regulatory standards are applicable to the discharge from Fukushima Daiichi NPS (FDNPS)？
Q11: What level of radioactive impact will the release of the treated water have?
＜Countermeasures for possible reputational damage＞
Q12: What kind of countermeasures will be taken for possible reputational damage?
＜Future plans＞
Q13: What are the steps toward handling of treated water?
Related Articles and Videos
【Articles】
Reuters
- Japan’s challenges and initiatives in discharging Fukushima water
- The science and global standards behind Fukushima’s ALPS treated water
The Wall Street Journal
New Scientist
South China Morning Post
【Videos】
Euronews
MOFA
ANRE Special Contents - article on ALPS treated water -
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First priority is given to safety and security Measures related to contaminated water in Fukushima Experts’ advice on ALPS treated water (May 29, 2020) -
Fight against contaminated water: The generation of contaminated water steadily reduced to about one-third (August 8, 2019)
Related Links
- TEPCO: Tokyo Electric Power Company
- TEPCO:TREATED WATER POTAL SITE
- NDF: Nuclear Damage Compensation and Decomissioning Facilitation Corporation
- NRA: Nuclear Regulation Authority
- MAFF: Ministry of Agriculture, Forestry and Fisheries
- Fukushima Prefecture: Food monitoring site
- IRID: International Research Institute for Nuclear Decommissioning
- JAEA: Japan Atomic Energy Agency
- IAEA: Fukushima Daiichi Status Updates
- MOE: ALPS Treated Water Marine Monitoring Information
Division in Charge
Nuclear Accident Response Office, Electricity and Gas Industry Department, Agency for Natural Resources and Energy
Download(To Adobe site)Last updated:2025-05-30