haughtney1,
I remember that this Airbus rule - donŽt start or stop the APU during refueling - was changed several years ago (at least for the A330/A340). IŽll dig around a bit tomorrow.
Anyway - in these days, rather beware of A330/A340 APU generator pieces exiting the tailcone and hitting you when the APU is running (regardless of refuel ops)...
Cheers,
J.V.