International Atomic Energy Agency (IAEA) experts have confirmed that the tritium concentration in the 11th batch of diluted ALPS treated water, which the Tokyo Electric Power Company (TEPCO) began discharging on 12 March, is far below Japan’s operational limit.

As for the previous ten batches, IAEA experts stationed at the Agency’s office at the site of the Fukushima Daiichi Nuclear Power Station (FDNPS) conducted an independent on-site analysis of samples from the treated water. The IAEA confirmed that the tritium concentration in the diluted water is far below the operational limit of 1500 becquerels per litre and is in line with international safety standards.

In line with Japan’s plans, the ALPS-treated water is being released from FDNPS in a series of batches over the next decades, following the start of the discharge in August 2023. The IAEA confirmed that the tritium concentrations in the previous ten batches, totalling approximately 78.200 cubic meters of water, were also far below operational limits.

In a comprehensive report issued on 4 July 2023 before the discharge began, the IAEA’s safety review found that Japan’s plan for handling the treated water was consistent with international safety standards and that the release as planned would have a negligible radiological impact to people and the environment.

Reports on sampling, independent analysis, data evaluation, as well as timeline, are available on the IAEA website.