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Tokyo Electric Power Co. (TEPCO) will build wells to redirect groundwater away from the damaged Fukushima No. 1 nuclear plant.

Groundwater has been mixing with highly radioactive cooling water at the plant, increasing the amount of contaminated water at the complex, officials said.

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TEPCO said the wells will direct about half of the groundwater into the Pacific Ocean before all of it goes into the reactor buildings and elsewhere.

“By creating a groundwater bypass, the amount of water flowing [into the] reactor buildings is expected to be reduced by about 50 percent,” TEPCO said in a progress reported on its work to decommission the plant.

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The groundwater will undergo tests for radioactive levels before releasing into the ocean, TEPCO said.

A government official said the wells will likely become operational in September or October.

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