TEPCO said that the radioactive materials were in a water sample taken on Monday from the observation well 5 meters from the coast, east of the plant's No. 1 reactor. The previous highest radiation level in the well's water was 67 becquerels, according to the company.
Since the company is not takings steps to prevent tainted water in the well from flowing into the sea, such as injecting waterstops or pumping up contaminated groundwater, the water is likely to be reaching the plant's bay.
TEPCO's standards require strontium-90 levels to be less than 10 becquerels in water to be released into the sea.
The company said, however, that the levels of radioactive materials in a water sample taken at another nearby observation well have not changed much.
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