IAEA Reports on Additional Monitoring Analysis
Overview
The IAEA reported analytical results for radionuclide concentrations and interlaboratory comparison findings for ALPS treated water sampled in connection with additional monitoring after dilution with seawater and before discharge into the sea. It said the measurements were consistent with the conclusion of the IAEA Comprehensive Report that the radiological impact on people and the environment from discharging the water into the sea as planned would be negligible. The Ministry of Economy, Trade and Industry plans to continue providing information transparently in coordination with the IAEA and building understanding in Japan and abroad.
Key points
- The IAEA published analytical findings and comparison results related to additional monitoring.
- The reported measurements were consistent with the conclusion of the IAEA Comprehensive Report.
- The Ministry of Economy, Trade and Industry said it plans to continue coordinating with the IAEA and providing information transparently.
Overview
On November 4 (Vienna time), the International Atomic Energy Agency (IAEA) published a report related to additional monitoring conducted under the IAEA framework. The report covered analytical results for ALPS treated water sampled in December 2025 after dilution with seawater and before discharge into the sea.
For reference, the sixth sampling was conducted on December 5, 2025, and collected ALPS treated water after dilution with seawater and before discharge into the sea.
Impact
The report states that the measurements reported by participating analytical laboratories were consistent with the conclusion of the IAEA Comprehensive Report, published in July 2023, that the radiological impact on people and the environment from discharging the water into the sea as planned would be negligible.
Details
The report presented analytical results for concentrations of tritium and other radioactive substances, as reported by IAEA laboratories, third-country analytical laboratories selected by the IAEA, and Tokyo Electric Power Company (participating analytical laboratories), along with the comparison results.
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 work to build greater understanding in Japan and abroad of the safety of discharging ALPS treated water into the sea.