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

On Monday October 6 (local time in Vienna, Austria), the IAEA published reports related to Additional Measures under the IAEA framework:

(1) The report on the analytical results of ALPS treated water before dilution with seawater collected in February 2025, and
(2) The report on the analytical results of ALPS treated water diluted with seawater prior to the discharge into the sea collected in April 2025.

Each 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 Tokyo Electric Power Company Holdings (hereinafter referred to as “participating laboratories”), along with the comparison results.
The two reports note that the analytical 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.

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 (1): analysis of ALPS treated water before dilution with seawater collected in February 2025

• IAEA Marine Environment Laboratories and IAEA Fukushima ALPS Laboratory (IAEA)
• French Authority for Nuclear Safety and Radiation Protection (ASNR), France
• China Institute for Radiation Protection (CIRP), China
• Korea Institute of Nuclear Safety (KINS), Republic of Korea
• Spiez Laboratory (SPIEZ), Switzerland
• Tokyo Electric Power Company Holdings, Inc. (TEPCO), Japan

Participating Laboratories (2): analysis of ALPS treated water diluted with seawater prior to the discharge into the sea collected in April 2025

• IAEA Fukushima ALPS Laboratory (IAEA)
• China Institute for Radiation Protection (CIRP), China
• Institute for Problems of Environmental Monitoring, RPA "Typhoon"　(IPEM), Russian Federation
• Korea Institute of Nuclear Safety (KINS), Republic of Korea
• Spiez Laboratory (SPIEZ), Switzerland
• Tokyo Electric Power Company Holdings, Inc. (TEPCO), Japan

Related links

• The IAEA Press Release（October 6 (local time in Vienna, Austria)）
• The IAEA Report (Additional Measures for Independent Sampling and Analysis Related to Discharges of ALPS Treated Water –Additional Measures February 2025: Source Monitoring)
• The IAEA Report (Additional Measures for Independent Sampling and Analysis Related to Discharges of ALPS Treated Water – Additional Measures April 2025: Monitoring at Discharge Vertical Shaft/Seawater Pipe Header)
• 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)
• 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)
• 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)
• Let's get to know and understand about ALPS treated water. [Ministry of Economy, Trade and Industry]
• IAEA Website about ALPS treated water

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Nuclear Accident Response Office, Agency for Natural Resources and Energy