Speaking as former Nuclear Sub technician, there isn't much maintenance on the turbines (think transmission in a car -- it's not too often that you have to open it up) but the turbine, high precision machined stainless steel piping and equipment is very expensive. Our steam ran at 1000 psi plus, which we were told was high enough to cut a man in half if a small leak was sending out a stream.

Thanks for the link. Wow: This system used a 100,000 psi (690 MPa) pump to deliver a hypersonic liquid jet that could cut high strength alloys such as PH15-7-MO stainless steel.

I've used them and plasmacutters too, you don't want to point either at something you don't want to keep.