And as there is not any encryption as of yet on the Entergy System (At least not on this list and there is no listing for the Nuclear, or other Power Generation Plants Security etc... which I can assure you is encrypted, and not using ADP...USDOE and USDHS don't fart around with security regulations. )
I live in Russellville, which is near Arkansas Nuclear One, the only nuclear power plant in the state of Arkansas (oh, lucky me!). ANO occasionally asks for a radio check on the local Russellville Fire dispatch channel - this is the only radio traffic that I ever heard from them.