Akhir 17, 1432, March 23, 2011, SPA -- The operator of a troubled nuclear power plant in north-eastern Japan resumed efforts Tuesday to restore power at reactors a day after gray smoke from a reactor building halted their efforts, the government said. Tokyo Electric Power Co (TEPCO) did not expect the smoke to prevent their work, public broadcaster NHK reported. Meanwhile, TEPCO said radioactive substances were detected in seawater near the Fukushima 1 nuclear power plant, which was damaged by the March 11 earthquake and tsunami. Japanese military vehicles and a Tokyo Fire Department trucks were to resume their cooling operation, which involves showering water over overheating reactors 3 and 4 after their efforts were suspended due to the smoke, according to a report of DPA.