SEOUL, Jan 2 (Reuters) - South Korea's Shin Hanul No.1 nuclear rector is operating at 40% after a turbine shutdown, an official at the plant operator Korea Hydro & Nuclear Power said on Tuesday.

The turbine shut down in the morning, and the plant operator is investigating the cause of the shutdown, the official added. (Reporting by Heekyong Yang and Florence Tan; Editing by Christian Schmollinger)