The International Atomic Energy Agency (IAEA) has published three new reports on the analytical results of Additional Measures, confirming the consistency of independent assessments conducted by laboratories in China, France, South Korea, Russia and Switzerland – as well as by IAEA and Japanese laboratories.
The labs had analysed samples of treated water discharged from Japan’s Fukushima Daiichi NPP. Tokyo Electric Power Company Holdings (Tepco) began discharges of diluted ALPS (Advanced Liquid Processing System) treated water in August 2023. The new reports stated that the measurement results were consistent with the conclusions of the IAEA Comprehensive Report, which found that the discharges as planned would have a negligible radiological impact on people and the environment.
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The Additional Measures was introduced to permit third-party laboratories to independently verify that the discharge of ALPS treated water, continues to be consistent with international safety standards. The measures focus on expanding international participation and transparency in the IAEA’s sampling and independent analysis.
Two reports cover two missions conducted in February when IAEA Director General Rafael Mariano Grossi presided over the Additional Measures to collect seawater in the vicinity of Fukushima and when experts selected fish samples and samples of ALPS treated water prior to its dilution with seawater. The third report covers an expert mission in April when experts collected samples of ALPS treated water diluted with seawater prior to the discharge into the sea. These reports follow the Additional Measures report published in June 2025, which covered the IAEA mission to participate in marine sampling near the Fukushima plant in October 2024, bringing the total number of reports to four.
All samples were analysed independently by the participating laboratories as well as by the IAEA’s laboratories and Japanese laboratories conducting analysis of marine environment monitoring. All third-party laboratories are members of the IAEA’s Analytical Laboratories for the Measurement of Environmental Radioactivity (Almera) network, selected for their high level of expertise and analytical proficiency. These reports – and Additional Measures generally – cover all key steps of the discharge process: ALPS treated water before dilution with seawater, ALPS treated water diluted with seawater, and sampling of seawater and fish close to the discharge outlet.
Each report includes the results from all laboratories involved and an IAEA evaluation to assess comparability and consistency of data. The reports (available on the IAEA website) are:
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By GlobalData- Additional Measures for Independent Sampling and Analysis Related to Discharges of ALPS Treated Water – Additional Measures February 2025: Marine Environmental Monitoring.
- Additional Measures for Independent Sampling and Analysis Related to Discharges of ALPS Treated Water – Additional Measures February 2025: Source Monitoring.
- 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.
