In August 2023, Tepco began releasing treated wastewater into the sea from the decommissioned Fukushima Daiichi nuclear power plant, despite opposition from local fishermen and China. According to Tepco and the IAEA, all radioactive elements, except for tritium, have been filtered out of the water. Tritium is present in negligible amounts and is considered harmless by these authorities.
However, during a routine inspection in March, corroded tanks with peeling paint were discovered after being emptied of treated radioactive water. Investigations revealed that the corrosion does not affect the tanks’ structure, and no leaks have been reported. Tepco has assured the IAEA that there is no risk of water leakage. Inspections of tanks containing treated water are carried out annually to detect any abnormalities since it is impossible to inspect their interiors without the use of underwater robots.
Despite this reassurance, concerns about corrosion on older tanks installed over a decade ago remain. While Tepco states that the tanks’ structural integrity is not compromised, some experts believe that they may need to be replaced or retrofitted to prevent further deterioration. The decommissioning process of the plant is ongoing but is expected to take several decades, making it essential to continue monitoring and maintaining all equipment on site.