Fukushima Daiichi Status Updates

On 16 July 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during April, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of April. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 16 July 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during March, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of March. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 19 June 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during February, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of February. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 19 June 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during January, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of January. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 19 June 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during December, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of December. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 21 February 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during November, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of November. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 1 February 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during October, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of October. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 1 February 2025, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during September, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of September. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 28 November 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during August, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of August. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

The Japanese Government has provided the IAEA with a report that summarizes the events and highlights the progress related to recovery operations at the Fukushima Daiichi Nuclear Power Station. The IAEA provided its assessments, which are contained in full at the end of the report.

This assessment has been performed on aspects presented in the June 2024 report 'Events and highlights on the progress related to recovery operations at TEPCO's Fukushima Daiichi Nuclear Power Stationn'. It does not include recent developments that will be taken into consideration in a next report.

Status towards the fuel debris retrieval from Primary Containment Vessel (PCV)

The IAEA acknowledges TEPCO’s continued work for the investigation inside the Unit 1 PCV and the fuel debris sampling inside the Unit 2 PCV, including the utilization of robot and drone technologies.

Preparation for fuel removal from Unit 2 spent fuel pool

The IAEA acknowledges the steady progress that has been made in the preparatory work for the removal of spent fuel from Unit 2 spent fuel pool, including shielding and concrete placement.

Sea area monitoring results

The IAEA acknowledges that the levels measured by Japan in the marine environment are low and relatively stable. For the purpose of public reassurance, the IAEA encourages the continuation of sea area monitoring. Furthermore, the IAEA considers that the ongoing data quality assurance programme which is in place is key for ensuring the accuracy and the quality of the results of the monitoring programme. It also enhances transparency and contributes to building stakeholders’ confidence.

Food products

Based on the information that has been made available, the Joint FAO/IAEA Centre understands that measures to monitor and respond to issues regarding radionuclide contamination of food are appropriate, and that the food supply chain is controlled effectively by the relevant authorities and that the public food supply is safe.

On 29 October 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during July, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of July. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 1 October 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during June, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of June. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 10 July 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during May, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of May. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 13 June 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during April, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of April. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 13 June 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during March, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of March. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 22 March 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during February, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of February. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 5 March 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during January, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of January. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 18 January 2024, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during December, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of December. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 27 December 2023, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during November, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of November. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.

On 21 November 2023, Japan provided the IAEA with a copy of a report on the discharge record and the seawater monitoring results at the Fukushima Daiichi Nuclear Power Station during October, which the Ministry of Foreign Affairs has sent to all international Missions in Japan.

The report contains information on discharges from the subdrain and groundwater drain systems, as well as on groundwater bypassing conducted during the month of October. In both cases, in advance of the action, TEPCO analyzes the quality of the groundwater to be discharged and announces the results. These results confirm that the radiation level of sampled water are substantially below the operational targets set by TEPCO.