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- As a Part of the Additional Measures under the IAEA Framework, ALPS Treated Water before Dilution with Seawater was Sampled on the Premises of TEPCO’s FDNPS
As a Part of the Additional Measures under the IAEA Framework, ALPS Treated Water before Dilution with Seawater was Sampled on the Premises of TEPCO’s FDNPS
May 29, 2026
Joint News Release with the Ministry of Foreign Affairs
Today, International Atomic Energy Agency (IAEA) officials, experts from third-party laboratories and Tokyo Electric Power Company Holdings (TEPCO) sampled ALPS treated water before dilution with seawater on the premises of TEPCO’s Fukushima Daiichi Nuclear Power Station (FDNPS).
As a part of the Additional Measures under the IAEA framework, IAEA officials and experts from third-party laboratories visited Japan and collected samples today.
In September 2024, Japan and the IAEA concurred on conducting the Additional Measures under the IAEA framework. This was the eighth mission for conducting the Additional Measures since October 2024.
In this Additional Measures mission, IAEA officials, experts from laboratories in the People's Republic of China, the Republic of Korea, the Russian Federation, and the Swiss Confederation (Switzerland) and TEPCO sampled ALPS treated water before dilution with seawater from the measurement/confirmation tanks on the premises of TEPCO's FDNPS.
The Ministry of Economy, Trade and Industry will continue to maintain close coordination with the IAEA in sharing information with the international community in a highly transparent manner and fostering better understanding of the safety of the discharge of ALPS treated water within both the domestic and international communities.
〔Reference〕 Measurement/confirmation tanks
The tanks used to receive ALPS treated water from the storage tanks etc. on the premises of TEPCO’s FDNPS, and to circulate and stir ALPS treated water to collect representative samples for the analysis prior to the dilution and discharge.
〔Reference〕 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)
- 6th: December 5, 2025 (collection of ALPS treated water diluted with seawater prior to the discharge into the sea)
- 7th: February 4, 2026 (collection of seawater), February 5, 2026 (selection of fishery products)
- 8th: May 29, 2026 (collection of ALPS treated water prior to dilution with seawater)
Related links
- The IAEA Published a Report on the Analytical Results of the Additional Measures under the IAEA Framework (May 1, 2026)
- The IAEA Published Reports on the Analytical Results of Additional Measures under the IAEA Framework (October 7, 2025)
- As a Part of Additional Measures under the IAEA Framework, ALPS Treated Water before Dilution with Seawater was Sampled on the Premises of TEPCO’s FDNPS (June 17, 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)
- Special Page explaining ALPS Treated Water
- Let's get to know and understand about ALPS treated water.
- Fukushima Daiichi ALPS Treated Water Discharge (IAEA)
Division in Charge
Nuclear Accident Response Office, Agency for Natural Resources and Energy