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  5. The IAEA Published a Report for “Corroboration of External Exposure Monitoring” for Workers as Part of the Review of Safety Related Aspects of Handling ALPS Treated Water

The IAEA Published a Report for “Corroboration of External Exposure Monitoring” for Workers as Part of the Review of Safety Related Aspects of Handling ALPS Treated Water

November 12, 2024

On November 11, the IAEA published a report on “Corroboration of External Exposure Monitoring: Performance of Whole-Body, Extremity and Eye-Lens Dosemeters” for the corroboration of occupational radiation protection as part of the review of safety-related aspects of handling ALPS treated water at TEPCO's Fukushima Daiichi Nuclear Power Station. This report describes the results of interlaboratory comparison (ILC) of measurement results from whole-body, extremity and eye-lens dosemeters, and includes a detailed assessment of the performance of the participating laboratories.

1. Summary

On November 11, the IAEA published a report on corroboration of external exposure monitoring as part of the review of safety-related aspects of handling ALPS treated water. This report is part of the review activities conducted by the IAEA: (1) Assessment of Protection and Safety (TEPCO and METI), (2) Regulatory Activities and Processes (NRA), and (3) Independent Sampling, Data Corroboration, and Analysis (monitoring and verification activities by the IAEA). As part of the activities corresponded to (3), this report presents the results of ILC and the companies’ (Chiyoda Technol Corporation and Nagase Landauer, Ltd. contracted by TEPCO) analytical capabilities of monitoring external radiation exposure of workers, who are involved in handling ALPS treated water. Specifically, the external radiation exposure of whole-body, extremity and eye-lens is measured by using dosemeters, and how accurately they are measured is summarized as the results of ILC.

2. Points of the Report

The key findings of the reported interlaboratory comparisons are:
1. Japanese laboratories have demonstrated a high level of accuracy in their measurements and technical competence.
2. Analytical procedures follow the appropriate methodological standards required to obtain technically valid results.

The IAEA notes that these findings provide confidence in Japan’s capability for accurate assessment of external radiation exposure of workers involved in handling ALPS treated water.

3. Participating Laboratories

1. IAEA Radiation Safety Technical Services Laboratory
2. Individual monitoring services contracted by TEPCO

4. Response to the IAEA Report

Through the IAEA review, the Government of Japan will continue to take measures in accordance with international safety standards and take all possible measures to ensure safety, including radiation exposure control of workers.

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