I can't say that I have heard any unusual noises from the steering system. That said, I doubt the noise you're hearing is the power steering pump, as it should be relatively quiet because it's electric. Generally, electric power steering systems are quieter. The power steering system still uses hydraulic fluid for the rack operation.
If the noise is the pump, there is likely something wrong. There is a chance its the rack, but very unlikely. If it's bothering you, take it into the dealer.