Additional inspectors are being sent to nuclear power plants in five states -- including New York -- as Hurricane Sandy approaches the East Coast.
Indian Point in Buchanan is among the plants affected.
The Nuclear Regulatory Commission says its headquarters and Northeast regional office are both closed, except for emergency personnel.
The agency says safeguards at all nuclear plants can withstand hurricane-force winds and flooding. Still, plants will be shuttered if hurricane-force winds are expected in the area.
At Indian Point, a spokesman for plant owner, Entergy, said the nuclear facility has made preparations ahead of the storm.
"Flooding at the site has been virtually nonexistent," Jerry Nappi said, noting the site can withstand more than 15-foot water levels.
Sandbags and pumps have been put in place around low-lying equipment, Nappi said.
In New Jersey, extra inspectors equipped with satellite phones are being sent to Oyster Creek in Lacey Township, and Salem and Hope Creek in Hancocks Bridge. In Pennsylvania, Three Mile Island in Middletown, Peach Bottom in Delta and Susquehanna in Salem Township will get reinforcements. Indian Point, Millstone in Waterford, Conn., and Calvert Cliffs in Lusby, Md., will also get extra inspectors.