I have not heard any INL Fire Dept traffic on any frequencies and I have been listening for a number of years. Nor have I seen anything posted in this forum. I've almost come to the conclusion that it is encrypted. I'm sure the INL Security is encrypted.
There appears to be some limited INL traffic on the White Cloud Communications P25 system, but I don't know if it is DOE or DOE Contractors. There are several Encrypted Talk Groups on this system.
White Cloud Communications (P25) Trunking System Profile
www.radioreference.com