Fukushima: Tritium Release Has Negligible Impact on Oceans
A new study by the University of Tokyo and the University of Fukushima shows that the release of tritium-containing water from the damaged Fukushima Daiichi nuclear power plant has minimal impact on tritium concentration in the Pacific Ocean. The findings, published on July 2, 2025, in Marine Pollution Bulletin, are based on global ocean model simulations and consider both short- and long-term scenarios, including climate change effects. Since the 2011 nuclear disaster, water has been used to cool reactors at the Fukushima plant and purified with the Advanced Liquid Processing System (ALPS), which removes all radionuclides except tritium. Because tritium is difficult to separate and on-site storage capacity is limited, the controlled release of diluted, ALPS-treated water into the sea began in August 2023. This process is expected to be completed by 2050. Researchers simulated the distribution of tritium using a global ocean model and found that the increase in tritium concentration due to the...


