Litebulbs;
I am not saying that all do, but our one's have. I have had the privilege of watching the system used in anger!
You know, somewhere I recall someone saying that before, so thank you for reminding me. Ours didn't and I thought it was the design itself.
takata;
If the AF447 A330 had a fuel dump system, given the kinds of equipment powered (necessary for safe flight only), on the emergency electrical generator or the batteries, I would expect that no fuel dump capability would remain. Fuel dump is simply to reduce landing weight, but these aircraft are usually certified to land at MTOWs so fuel dump would not be an "emergency" item required for safe flight.
Sorry for misleading you and thanks to litebulbs.