As a Part of the Additional Measures under the IAEA Framework, ALPS Treated Water Diluted with Seawater was Sampled on the Premises of TEPCO’s FDNPS

Jul 9, 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 diluted 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 visit was the tenth mission for conducting the Additional Measures since October 2024.

In this Additional Measures mission, IAEA officials, experts from laboratories in China, the Republic of Korea, the Russian Federation, and Switzerland and TEPCO sampled ALPS treated water diluted with seawater 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〕 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)
• 9th: June 24, 2026 (collection of seawater), June 25, 2026 (selection of fishery products)