The IAEA Conducted the Fourth Review Mission on the Safety of the Discharge of ALPS Treated Water into the Sea since the Start of the Discharge into the Sea

Six IAEA officials, including Mr. Gustavo Caruso, Director and Coordinator, Department of Nuclear Safety and Security, and seven international experts (from Argentina, Canada, China, Republic of Korea, Russia, the United States, and Vietnam), visited Japan for the review mission regarding the discharge of ALPS treated water from TEPCO’s FDNPS into the sea. This is the fourth review mission since the start of the discharge into the sea.

During the review mission, the IAEA Task Force discussed technical matters based on the IAEA international safety standards, focusing on Japan’s efforts in the monitoring conducted on the premises of TEPCO’s FDNPS and the sea area monitoring related to the discharge of ALPS treated water, and visited TEPCO’s FDNPS to review the site. 

The following is a summary of the discussions and the site visit to TEPCO’s FDNPS.

1. Overview of Meetings during the Review

The Government of Japan (MOFA, METI, NRA, MOE and JFA), Fukushima Prefecture and TEPCO provided the IAEA Task Force with the information on the status and the results of the monitoring conducted on the premises of TEPCO’s FDNPS and the sea area monitoring related to the discharge of ALPS treated water into the sea. Also, the Japanese side explained the consistency of the monitoring with the international safety standards followed by a discussion with the Task Force.

• IAEA Task Force
• Mr. Caruso

2. Overview of Site Visit to TEPCO’s FDNPS during the Review

On May 28, the IAEA Task Force visited TEPCO’s FDNPS to receive a briefing from TEPCO on the latest situation at the site and to review the status of the facilities related to the discharge of ALPS treated water, focusing on the facilities for monitoring.

Related Links

• IAEA Officials and International Experts to Visit Japan for the Review on the Safety of the Discharge of ALPS Treated Water into the Sea (May 20, 2025)
• The IAEA Published a Report on its Third Review Mission of Safety Related Aspects of the Discharge of ALPS Treated Water into the Sea after the Start of the Discharge (March 25, 2025)
• The IAEA Published a Report on Its Second Review Mission of Safety Aspects of Handling of ALPS Treated Water at Fukushima Daiichi Nuclear Power Station since the Start of the Discharge in April 2024 (July 18, 2024)
• The IAEA Published a Report on Its Second Review Mission of Safety Aspects of Handling of ALPS Treated Water at Fukushima Daiichi Nuclear Power Station since the Start of the Discharge in October 2023 (January 30, 2024)
• 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

Division in Charge

Nuclear Accident Response Office, Agency for Natural Resources and Energy