Studies are getting underway over the next year to analyze the safety of nuclear power plants when it comes to earthquakes.

Cook Nuclear Plant spokesman Bill Schalk says the work was prompted by the 2011 earthquake, tsunami and resulting nuclear accident at the Fukishima plant in Japan. He says there are low-frequency and high-frequency earthquakes, and each affect things differently.

New data submitted to the Nuclear Regulatory Commission in March shows greater potential seismic risk than the analysis used for the original plant designs.

Schalk says Cook is still safe, and officials note they are confident the plant near Bridgman in Berrien County was built with substantial seismic safety margins and will still be within that criteria even using the new methodology.

Cook and the other nine plants are required to submit a detailed risk analysis to the NRC by June 30, 2017.