From what I remember from RAF days, 'Ops Normal' is a call originated by low level helos, Nimrods and the like that operate for lengthy periods of time on an operational frequency. Depending on SOP's, they will pop up on an ATC frequency every half hour or so and report 'Ops Normal'. This is nothing more than a call to say 'Hello chaps, don't worry. We're still here and everything is fine'. There is often a requirement to pass this info on to the aircraft's operating agency, and everyone knows what the message means.
However, an out-of-the-blue request from civil ATC concerning Ops Normal can mean all things to all men, and should not be used. It is basically a military phrase, and is about as useful as asking a civil pilot to report 'Feet Wet'.