Japan starts 21st Fukushima nuclear-contaminated water discharge

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The Fukushima Daiichi Nuclear Power Plant is seen from Namie, Fukushima Prefecture, Japan, August 24, 2023. /VCG

Tokyo Electric Power Company (TEPCO) on Monday began the 21st discharge of nuclear-contaminated water from the Fukushima Daiichi Nuclear Power Plant since the controversial release program started in August 2023.

The latest discharge, the third for fiscal 2026, began at 11:41 a.m. local time (0241 GMT), according to local media reports. TEPCO said the operation is scheduled to continue through July 24, during which about 7,800 tonnes of ALPS-treated nuclear-contaminated water will be released into the sea.

The company said the discharged water contains about 1.3 trillion becquerels of tritium after dilution to meet its operational standards.

TEPCO plans to conduct eight discharge rounds totaling about 62,400 tonnes of nuclear-contaminated water during fiscal 2026.

Despite concerns and opposition from the international community, Japan began releasing the Fukushima nuclear-contaminated water into the Pacific Ocean in August 2023. So far, TEPCO has completed 20 discharge rounds, releasing a cumulative total of about 157,000 tonnes of nuclear-contaminated water.

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