science
TEPCO Completes Second Round of Fukushima Treated Water Release
Tokyo Electric Power Company Holdings finished discharging about 7,900 tons of treated water on June 20, 2026. The round began June 1 and faced two temporary halts after alarms.
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Tokyo Electric Power Company Holdings completed the second round of fiscal 2026 treated water release from the Fukushima No. 1 nuclear power plant on June 20, 2026. The company discharged about 7,900 tons of water containing small amounts of radioactive tritium about 1 kilometer offshore through an undersea tunnel after dilution with seawater.
The discharge round began on June 1 and ended one day later than planned. It was halted on June 10 after the first alarm sounded and again on June 13 after a second alarm. TEPCO replaced a tank outlet valve following the first alarm and resumed the next day.
The second alarm was attributed to a brief power outage that reduced pump flow, and operations restarted the same day. In fiscal 2026, which began in April, TEPCO plans to release a total of about 62,400 tons of treated water across eight rounds. The company began releasing treated water from the plant in August 2023 to free space for decommissioning work.
The Fukushima No. 1 plant suffered a triple meltdown after the March 2011 earthquake and tsunami. TEPCO and the Japanese government continue to monitor tritium levels in seawater and fishery products, which remain below government safety standards.
