The Nuclear Regulation Authority on Friday ordered Tokyo Electric Power Co. to bring under control the massive amount of radioactive water gushing from the Fukushima No. 1 nuclear complex, including by boosting worker numbers on-site.

Summoning Tepco President Naomi Hirose after a series of recent spills at the crippled power plant, Katsuhiko Ikeda, head of the NRA secretariat, tore into the utility for "rudimentary mistakes" that caused the toxic water problem and said its management in the field was "significantly deteriorating."

"I want you to implement on-site management appropriately even if it requires bringing workers from Tepco's other nuclear power plants," Ikeda warned Hirose.