The 21st round of ocean discharge of nuclear-contaminated wastewater from Japan's crippled Fukushima Daiichi Nuclear Power Plant was completed, the plant's operator, Tokyo Electric Power Company Holdings, said on Friday.

The latest release began on July 6 and ended on Friday. A total of 7,894 tonnes of nuclear-tainted wastewater was discharged, containing approximately 1.3 trillion becquerels of radioactive tritium, according to local media.

Hit by a magnitude-9 earthquake and an ensuing tsunami on March 11, 2011, the Fukushima Daiichi plant suffered core meltdowns that released radiation, resulting in a level-7 nuclear accident, the highest on the International Nuclear and Radiological Event Scale.

Despite concerns and opposition from the international community, Japan unilaterally launched the discharge of nuclear-contaminated water from the plant into the ocean in August 2023. As of the completion of the 21st round, the cumulative volume released has reached about 165,000 tonnes.