Tokyo Electric Power Co. said it will install water level gauges on all flange-type tanks storing radioactive coolant at the Fukushima No. 1 nuclear plant by the end of November, to enhance monitoring.

Last month, Tepco belatedly revealed that one of the tanks, which number in the hundreds and are made of steel plates bolted together, leaked 300 tons of highly radioactive water, causing a domestic and international uproar over the environmental contamination.

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