Shearon Harris Siren Testing

All information provided by Duke Energy. Check their website for more detailed information about the Shearon Harris Nuclear Plant.

NOTE: Full-volume test on Wednesday, November 14th, around 10 am

Intermittent Testing During October and November
The outdoor warning sirens within the 10-mile area around the Harris Nuclear Plant will be individually during October and November. The tests will be full-volume, and will last approximately 5 to 10 seconds. The work will be conducted Tuesday through Thursday, between 7 a.m. and 5 p.m. Since the sirens will be tested individually, there is no specific time when residents can expect to hear the sirens. 

This testing is being performed to support the annual maintenance of the sirens. These audible tests are conducted to ensure each siren works properly after the maintenance is performed. Each siren may be tested multiple times. Residents may not hear the sirens unless they are close to one when it is being tested.

Questions about the tests may be directed to county or state emergency management agencies or to Duke Energy at

2018 Siren Test Dates

Low-volume tests (5-30 seconds)

  • January 10
  • April 11
  • July 11
  • October 10

Full-volume test (3 minutes)

  • November 14

Full-volume siren tests are scheduled to occur on Wednesday mornings to minimize inconvenience for plant neighbors. The tests, which last up to three minutes, are conducted to make sure each siren works properly.

If sirens are sounding and you do not see or hear a message on radio or television, contact the Wake County Emergency Management office

Additional Emergency Information regarding Sirens and Emergency Broadcasts

To alert people outdoors, county officials will sound sirens located within the 10-mile area Emergency Planning Zones (EPZ) around the station. Sirens will sound repeatedly in an emergency. If you hear a loud, steady sound coming from one of the sirens around the nuclear station, tune to a local radio or TV station. These stations will carry an emergency alert information (EAS) message from local officials to give you information and instructions on what to do. Hearing a siren does not mean you should evacuate. It simply means to tune to a local radio or television station for information.

To alert people indoors, radio and television stations will carry emergency information messages from local officials. Follow their instructions. Stay tuned. Remember, outdoor sirens will not necessarily be heard inside homes or businesses.

In an emergency, fire, police and rescue units may also patrol the affected area and sound their sirens, if necessary. Boaters also would be alerted via sirens, loudspeakers, etc. Please note: Sirens are tested regularly to ensure they are working correctly. The testing is part of normal maintenance and no public action is necessary.