Some 7,000 tons of radioactive water at risk of leaking into the ground still has to be removed from underground tunnels and other locations at the Fukushima No. 1 nuclear plant.
Tokyo Electric Power Co. is trying to get rid of tainted water from the cable tunnels for reactors 2 and 3. That work is expected to be mostly completed by the end of this month.
As of Monday, such water could still be found in at least 16 such locations at the plant, where three reactors suffered a meltdown after being heavily damaged in the March 2011 earthquake and tsunami.
According to Tepco, numerous underground tunnels, ducts and pits hold radioactive water, in addition to the reactor and turbine buildings. Some of the water is more radioactive than the contaminated water already in storage tanks.
The highest levels of radioactive substances contained per liter were 990 becquerels of cesium-134 and 3,200 becquerels of cesium-137, more than 60 times higher than the provisional standards for water Tepco may discharge within the plant site.
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