Transport and dispersion of tritium from the radioactive water of the Fukushima Daiichi nuclear plant

Japan recently announced plans to discharge over 1.2 million tons of radioactive water from the Fukushima Daiichi Nuclear Power Plant (FDNPP) into the Pacific Ocean. The contaminated water can poses a threat to marine ecosystems and human health. To estimate the impact of the plan, here, we developed a threedimensional global model to track the transport and dispersion of tritium released from the radioactive water of the FDNPP. The pollution scenarios for four release durations (1 month, 1 year, 5 years, and 10 years) were simulated. The simulation results showed that for the release in short-duration scenarios (1 month and 1 year), the peak plume with high tritium concentration shifted with the currents and finally reached the northeastern Pacific. For the long-duration scenarios (5 years and 10 years), the peak plume of the contaminated water was confined to coastal regions east of Japan.

Automated summary

Japan plans to release over 1.2 million tons of radioactive water from the Fukushima Daiichi Nuclear Power Plant into the Pacific Ocean, posing a threat to marine ecosystems and human health. Studies show that in short-term release scenarios, the peak plume with high tritium concentration can reach the northeastern Pacific, while in long-term release scenarios, the contaminated water plume is confined to coastal regions east of Japan.