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Following the Basic Policy announced by the Government of Japan on 14 April 2021, based on the Terms of Reference (TOR) on a comprehensive framework for reviewing safety related aspects of handling ALPS treated water at TEPCO's FDNPS, which was signed on 8 July 2021, a series of review was conducted by the IAEA. On July 4th, IAEA Director General Rafael Mariano Grossi handed over the Comprehensive Report to Prime Minister Kishida and the report was published accordingly.
Executive Summary of the IAEA Comprehensive Report states the following conclusions;
Based on its comprehensive assessment, the IAEA has concluded that the approach to the discharge of ALPS treated water into the sea, and the associated activities by TEPCO, NRA, and the Government of Japan, are consistent with relevant international safety standards.
The IAEA has concluded, based on its comprehensive assessment, that the discharge of the ALPS treated water, as currently planned by TEPCO, will have a negligible radiological impact on people and the environment.
With regard to the safety and the handling of ALPS treated water, reviews by the IAEA which is authorized under its Statue to establish and apply international safety standards in the field of nuclear energy are very important for ensuring confidence and transparency, and for promoting understanding in the international community. The Government of Japan will continue to provide necessary information and remains committed to making efforts to promote better understanding in the international community regarding the handling of ALPS treated water.
[Reference 1] ALPS treated water is water which is processed by devices such as ALPS (Advanced Liquid Processing System) to ensure that the concentration of the radioactive materials other than tritium surely meet the regulatory standards for safety. In addition, it is planned that ALPS treated water will then be sufficiently diluted before the discharges into the sea so that concentration of all radioactive materials including tritium will be far below the regulatory standards for safety.

[Reference 2] Previous published reports on IAEA's Safety Review

The 1st report (PDF)Open a New Window published on April 29th, 2022, describes the details of IAEA's review mission to METI and TEPCO conducted in February 2022, related to eight different technical areas, including the characterization of discharge and source term, the safety-related aspects of system and processes for controlling discharges, and the radiological environmental impact assessment.
The 2nd report (PDF)Open a New Window published on June 16th, 2022, describes the details of IAEA's review mission to the Nuclear Regulation Authority conducted in March 2022, related to five technical topics, including the responsibilities and functions of the government, major principles and safety objectives, and authorization process.
The 3rd report (PDF)Open a New Window published on December 29, 2022, describes the IAEA's planned activities for the analysis and data corroboration of source monitoring of the ALPS treated water, environmental monitoring, and occupational radiation protection for workers at the FDNPS.
The 4rd report (PDF)Open a New Window published on April 5, 2023, describes the details of IAEA's review mission to METI and TEPCO conducted in November 2022, related to eight different technical areas, including the characterization of discharge and source term, the safety-related aspects of system and processes for controlling discharges, and the radiological environmental impact assessment.
The 5th report (PDF)Open a New Window published on May 4, 2023, describes the details of IAEA's review mission to the Nuclear Regulation Authority conducted in January 2023, related to the five technical topics, including the responsibilities and function of the government, major principles and safety objectives, and authorization process.
The report "First Interlaboratory Comparison on the Determination of Radionuclides in ALPS Treated Water" published on 31May, 2023, summarizes the results of an interlaboratory comparison (ILC) on the determination of radionuclides in ALPS treated water conducted under the IAEA's safety review.

Visit of H.E. Mr. Rafael Mariano Grossi, Director General of the International Atomic Energy Agency (IAEA) to Japan

From July 4 to 7, H.E. Mr. Rafael Mariano Grossi, Director General of the International Atomic Energy Agency (IAEA) will make a working visit to Japan as a guest of the Ministry of Foreign Affairs of Japan.

During his stay in Japan, he will have meetings with senior officials, including Mr. HAYASHI Yoshimasa, Minister for Foreign Affairs, and visit TEPCO's Fukushima Daiichi Nuclear Power Station and other sites.
Japan attaches importance to the work of the IAEA, which plays a significant role in promoting nuclear non-proliferation and the peaceful uses of nuclear energy. Japan has been assisting Director General Grossi to the fullest extent possible in discharging his reponsibilities and will continue to strengthen the activities of the IAEA in close cooperation with other IAEA member States.
Director General Grossi's visit to Japan is expected to contribute to the further strengthening of the relationship between Japan and the IAEA.
(Reference1) International Atomic Energy Agency (IAEA)
The IAEA is an international organization established in July 1957 that implements safeguards for the purposes of promoting the peaceful uses of nuclear energy and preventing the diversion of nuclear energy for military purposes. It currently has 176 Member States (as of January 2023).

(Reference2) Director General Rafael Mariano Grossi (Profile)
1985 Joined the Argentinian Foreign Ministry
2002 - 2007 Chief of Cabinet at the Organization for the Prohibition of Chemical Weapons (OPCW)
2010 - 2013 Chief of Cabinet at the IAEA
2013 - 2019 Ambassador of Argentina to Vienna
2014 - 2015 Chair of the Nuclear Suppliers Group (NSG)
Dec. 2019 - Director General at the IAEA