This number belongs to TVA..........Tennessee Valley Authority......from the Watts Bar Nuclear Plant. The call could be made by an employee or from one of the human resource offices (either TVA or contractor) conducting reference-checks on new employees.
Told an anti-nuclear group why the Bellefonte plants TVA wants to restart are basically the same plant as at Three Mile Island-2 (and the design flaw in them) -- the day after the letter should have arrived, get a call from "TVA" on my cell from 423-756-3958 offering me a job (the wrong kind for me). Call back 36 hours later and the number has been disconnected. So whoever it is has access to the phone numbers and job levels of applicants, but isn't an engineer themselves.