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New method for contaminated water may be failing via NHK World News

Tokyo Electric Power Company has indicated that a new method aimed at tackling a large volume of highly radioactive wastewater at the Fukushima Daiichi nuclear power plant has not been entirely successful.

TEPCO gave a progress report on its work to a panel of experts at the Nuclear Regulation Authority on Friday.

The utility last month began pouring cement into underground tunnels filled with the contaminated water from the reactor buildings to stop the water inflow. The water is believed to be leaking into the sea.

TEPCO officials told the panel that workers have completely filled the U-shaped tunnels except for 4 vertical pits that connect the tunnels to the ground surface. They removed 2,500 tons of radioactive water.

But the officials said that when they pumped water up from one of the pits, the water level at another pit changed. That suggests that gaps exist in the concrete-filled tunnels.

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