The IAEA Published a Report on the Analytical Results of the Additional Measures under the IAEA Framework

On Thursday, April 30, the IAEA published a report on the analytical results of ALPS treated water before dilution with seawater collected by IAEA officials, experts from third-party laboratories selected by the IAEA and Tokyo Electric Power Company Holdings (TEPCO) in June 2025, related to the Additional Measures under the IAEA framework.

The report describes the analytical values of the concentrations of radioactive substances, such as tritium, reported by IAEA laboratories, third-party laboratories selected by the IAEA, and TEPCO (hereinafter referred to as "participating laboratories"), along with the comparison results.

The report notes that the measurement results reported by the participating laboratories are consistent with the conclusions of the IAEA Comprehensive Report released in July 2023, which found that the discharges as planned would have a negligible radiological impact on people and the environment.

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.

Participating Laboratories

• IAEA Fukushima ALPS Laboratory (IAEA)
• China Institute of Atomic Energy (CIAE), China
• Institute for Problems of Environmental Monitoring, RPA "Typhoon" (IPEM), Russian Federation
• Korea Institute of Nuclear Safety (KINS), Republic of Korea
• Belgian Nuclear Research Centre (SCK-CEN), Belgium
• Spiez Laboratory (SPIEZ), Switzerland
• Tokyo Electric Power Company Holdings, Inc. (TEPCO), Japan

Related links

• The IAEA Press Release (April 30, 2026)
• The IAEA Report (Additional Measures for Independent Sampling and Analysis Related to Discharges of ALPS Treated Water -Additional Measures June 2025: Source Monitoring)
• 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)
• The IAEA Published Reports on the Analytical Results of Additional Measures under the IAEA Framework (October 7, 2025)
• Publication of the IAEA Comprehensive Report on the Safety Review of the ALPS Treated Water at TEPCO's Fukushima Daiichi nuclear Power Station (FDNPS) (July 4, 2023)
• Special Page explaining ALPS Treated Water [Ministry of Economy, Trade and Industry]
• Let's get to know and understand about ALPS treated water. [Ministry of Economy, Trade and Industry]
• IAEA Website about ALPS treated water

Division in Charge

Nuclear Accident Response Office, Agency for Natural Resources and Energy