Prime Minister Naoto Kan asked the Chubu Electric Power Co. to suspend all the reactors at its Hamaoka nuclear plant after experts predicted that there's a 90 percent chance that a major quake would hit the region within 30 years.
The concern comes after the disaster at the Fukushima nuclear plant, which was crippled by the March 11 earthquake and tsunami.
Since the March 11 disasters, Chubu Electric has drawn up safety measures that include building a seawall nearly a mile long over the next two to three years.
The company also planned to erect concrete walls along 18 water pumps at the plant.
Trade Minister Banri Kaieda said the utility company should halt operating its nuclear reactors while implementing such safety measures.
The Associated Press contributed to this report.