ALPS Water Sampled at Fukushima Daiichi Under IAEA Monitoring
Overview
As part of additional monitoring under the IAEA framework, IAEA officials and experts from third-country analytical institutions visited Japan and sampled ALPS treated water after dilution with seawater at the Fukushima Daiichi Nuclear Power Station. This was the 12th monitoring round since October 2024, following an agreement between Japan and the IAEA in September 2024. The Ministry of Economy, Trade and Industry said it will continue to provide information transparently in coordination with the IAEA and work to build understanding in Japan and abroad of the safety of the ocean release.
Key points
- This was the 12th additional monitoring round conducted since October 2024.
- ALPS treated water after dilution with seawater was sampled within the Fukushima Daiichi Nuclear Power Station site.
- The Ministry of Economy, Trade and Industry said it will provide information in coordination with the IAEA and work to build understanding of the safety of the ocean release.
Overview
In September 2024, Japan and the IAEA agreed to conduct additional monitoring under the IAEA framework.
Details
IAEA officials, experts from analytical institutions in China, South Korea, the Russian Federation, and the Swiss Confederation, and Tokyo Electric Power Company participated in the sampling. The Ministry of Economy, Trade and Industry said it will continue to work closely with the IAEA, provide information transparently to the international community, and further build understanding in Japan and abroad of the safety of the ocean release of ALPS treated water.
Reference record, from the 1st through the 12th rounds: Seawater sampling took place in the 1st round (October 15, 2024), 2nd (February 19, 2025), 5th (September 9, 2025), 7th (February 4, 2026), and 9th (June 24, 2026). Seafood selection took place in the 2nd round (February 20, 2025), 5th (September 10, 2025), 7th (February 5, 2026), and 9th (June 25, 2026). ALPS treated water was sampled before dilution with seawater in the 2nd round (February 21, 2025), 4th (June 17, 2025), 8th (May 29, 2026), and 11th (September 11, 2026). ALPS treated water was sampled after dilution with seawater and before ocean release in the 3rd round (April 15, 2025), 6th (December 5, 2025), 10th (July 9, 2026), and 12th (October 7, 2026).