Press Releases

Publication of the reports on the analytical results of the Additional Measures under the IAEA framework related to the discharge of ALPS treated water into the sea

October 7, 2025
Japanese

On October 6, 2025, the IAEA published the reports on the analytical results of the additional measures under the IAEA framework conducted in February and April 2025.

  1. Report on the analytical resultsof the additional measures (seawater and fishery products) in February 2025
    1. The IAEA published the report on the analytical results of samples of seawater and fishery products collected by Japanese laboratories, IAEA officials and experts from third-party laboratories from China, the Republic of Korea and Switzerland selected by the IAEA in the vicinity of Tokyo Electric Power Company Holdings’s Fukushima Daiichi Nuclear Power Station.
    2. In the published report, the IAEA concluded that the results reported by the participating laboratories are consistent with the IAEA Comprehensive Report on the Safety Review of the ALPS-Treated Water released in July 2023 which concluded that the discharges as planned would have a negligible radiological impact on people and the environment.
  2. Report on the analytical results of the additional measures (ALPS treated water prior to dilution with seawater) in February 2025
    1. The IAEA published the report on the analytical results of ALPS treated water prior to dilution with seawater collected by Tokyo Electric Power Company Holdings, IAEA officials and experts from third-party laboratories from China, France, the Republic of Korea and Switzerland selected by the IAEA on the premises of Tokyo Electric Power Company Holdings’s Fukushima Daiichi Nuclear Power Station.
    2. In the published report, the IAEA concluded that the results reported by the participating laboratories are consistent with the IAEA Comprehensive Report on the Safety Review of the ALPS-Treated Water released in July 2023 which concluded that the discharges as planned would have a negligible radiological impact on people and the environment.
  3. Report on the analytical results of the additional measures (ALPS treated water diluted with seawater prior to the discharge into the sea) in April 2025
    1. The IAEA published the report on the analytical results of ALPS treated water diluted with seawater prior to the discharge into the sea collected by Tokyo Electric Power Company Holdings, IAEA officials and experts from third-party laboratories from China, the Republic of Korea, Russia and Switzerland selected by the IAEA on the premises of Tokyo Electric Power Company Holdings’s Fukushima Daiichi Nuclear Power Station.
    2. In the published report, the IAEA concluded that the results reported by the participating laboratories are consistent with the IAEA Comprehensive Report on the Safety Review of the ALPS-Treated Water released in July 2023 which concluded that the discharges as planned would have a negligible radiological impact on people and the environment.
  4. The Government of Japan will continue to maintain close coordination with the IAEA in sharing information with the international community in a highly transparent manner and fostering a better understanding of the safety of the discharge of ALPS treated water within both the domestic and international communities.

(Reference1) Past missions for conducting the additional measures

  • 1st: October 15, 2024 (collection of seawater)
  • 2nd: February 19, 2025 (collection of seawater), February 20, 2025 (selection of fishery products), February 21, 2025 (collection of ALPS treated water prior to dilution with seawater)
  • 3rd: April 15, 2025 (collection of ALPS treated water diluted with seawater prior to the discharge into the sea)
  • 4th: June 17, 2025 (collection of ALPS treated water prior to dilution with seawater)
  • 5th: September 9, 2025 (collection of seawater), September 10, 2025 (selection of fishery products)

(Reference2) Related links

(Reference3) ALPS treated water

ALPS treated water is water that contained radioactive substances from inside the buildings of TEPCO’s FDNPS, and has been purified and treated through multiple treatment facilities, including ALPS (Advanced Liquid Processing System), until the concentrations of all radioactive substances besides tritium are ensured to be below the safety regulatory standards. As for tritium as well, the water is significantly diluted with seawater before the discharge into the sea so that it fully satisfies safety regulatory standards.

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