TOKYO: Workers at Japan’s crippled Fukushima nuclear plant on Thursday scrambled to check hundreds of tanks storing highly radioactive water, after one sprang a leak that is feared to have seeped into the Pacific. Around 300 tons of toxic liquid was believed to have escaped from one of the tanks that hold water used to cool the broken reactors, while operator Tokyo Electric Power Co. warned some of it might have flowed into the ocean. “We have finished pumping out water from the troubled tank, while we have continued removing the soil soaked by the water,” he said. Spokesman Tsuyoshi Numajiri said on Wednesday that traces of radioactivity were detected in a drainage stream. “We cannot rule out the possibility that part of the contaminated water flowed into the sea,” he said.