North Anna Power Station
The Early Warning Siren System for the North Anna Power Station is comprised of 68 Whelen WPS-2806 and WPS-2906 sirens, located throughout Caroline, Hanover, Louisa, Orange and Spotsylvania counties. The sirens replaced a previous system, possibly of Sentry sirens, over a transitional period from 2006 to 2007.
The system is tested on the third Wednesday of February, May, August, and November at or around 11:10 AM, in 3 minutes of alert. The system uses a sequence of three activation signals, resulting in a distinct "triple windup" sound.
Most sirens use 560 Hz ESC-2020 controllers; however, a few use 435 or 465 Hz tones.
- Surry Power Station, also located in Virginia, and with an identical siren composition