These three are part of the Dominion Millstone EPZ since the island is within the ten mile radius. Why these were never upgraded is beyond me. Millstone is a odd ball as each the communities test the sirens on their own schedules (example being East Lyme and Waterford which test monthly) while other...

Those 2001s were part of the Peach Bottom system. When BayComm had gotten the contract for the East Coast plants under AmerGen at the time, all sirens were upgraded to have Federal FCs. Sirens that were already dead or problematic were replaced by 2001s. This is why you see Three Mile Island and Pea...

Here is my copy of the map of the system used at the plant. It has 76 out of the 78 current sirens, with siren unit labels.
https://drive.google.com/open?id=1UxRSC ... NZXb1Ke3eL

Here is a complete system map that I had. Sourced from actual driving and NRC docs
https://drive.google.com/open?id=1Xvghj ... 4CFaKtlw8-
feel free to use it.