Situated in Central Ukraine, the Zaporizhzhia NPP is the largest plant in Europe, generating about half of the country's nuclear-derived electricity, and more than a fifth of the total electricity produced in Ukraine.
"On September 11, at 13:40 [10:40 GMT], an emergency system shut down the sixth power unit at the Zaporizhzhia NPP," the company's press service said. "The cause of the shutdown is being investigated."
Four power units are currently operating at the plant, and the fifth has been taken offline until October for scheduled repairs. The sixth power unit was put into operation in 1995 and is the newest at the plant.
The company said no security regulations were broken and no radiation was released.
Out of a total of 15 power units at Ukraine's four NPPs, 11 are currently operational.
