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.
The company's announcement Friday about the gauges came after it admitted Thursday that the water probably seeped down through the plant's wrecked reactor buildings and merged with tainted groundwater flowing into the Pacific.