A Japanese nuclear reactor shut down automatically due to turbine trouble on Sunday but there were no radioactive leaks, the reactor's operator said.

The reactor in Niigata, some 200 kilometers (124 miles) north of Tokyo, was about to undergo a regular maintenance check late Sunday when it shut down, said a spokesman for Tokyo Electric Power.

Tokyo Electric Power, the world's largest private power company, operates a total of 17 nuclear reactors.