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850 tons of ‘decontaminated’ Fukushima water dumped into ocean

850 tons of ‘decontaminated’ Fukushima water dumped into ocean

© Shizuo Kambayashi

The first batch of radioactive groundwater filtered below “measurable limits” at Japan’s tsumani-stricken Fukushima nuclear power plant has been dumped into the ocean, as TEPCO seeks to ease toxic water building-up at the site.

Tokyo Electric Power Co. (TEPCO) that operates the crippled nuclear plant released its first 850 tons of filtered radioactive groundwater by sundown on September 14. This is a part of TEPCO’s “subdrain plan” that was approved in late July after a year-long battle with local fishermen who opposed the release fearing that it would pollute the ocean and contaminate marine life.

A third party panel has given the green light to the release after confirming that the radioactive content was below measurable limits, according to The Japan Times. TEPCO allows one becquerel of radioactive cesium per liter of decontaminated groundwater, three becquerels for elements that emit beta rays and up to 1,500 becquerels for tritium, which cannot be removed with existing technology.

Monday’s batch measured 330 to 600 becquerels per liter, TEPCO said, citing analyses conducted by the company and an outside organization.


Under the plan, TEPCO has to pump tons of water from 41 subdrain wells around the main buildings of the power plant and decontaminate it before the release. It has planned to pump 100 to 200 tons of groundwater daily and later increase it to 500 tons unless it triggers problems with the decontamination facilities.

By dumping the treated water into the ground, TEPCO and the government expects to halve the approximately 300 tons of contaminated water that is generated at the plant daily as well as reduce groundwater flowing into the reactor buildings.

TEPCO has yet to deal with remaining 680,000 tons of water that was used to cool the reactors during the 2011 meltdown.

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