Annual maintenance on the public alert notification siren system originally scheduled to end August 27 has been extended through September 10. As part of this work, each siren will be tested once maintenance is complete. Some sirens may be tested multiple times. The tests will be full-volume short duration tests that will last approximately five seconds. The maintenance will involve 83 siren sites, located within 10 miles of the Harris Nuclear Plant (Chatham, Lee, Harnett, and Wake Counties).

Progress Energy conducts silent tests every two weeks and low-volume tests every three months; full-volume testing is conducted annually. The siren tests are conducted in cooperation with the emergency planning offices of the State of North Carolina and Chatham, Harnett, Lee and Wake counties.