Now, due to losses of friction and heat, I will not exactly get 100 inch-lbs of work out at the other end, so the distance I moved that 100 lbs is now even less. Hydraulics and pneumatics are great sources for transferring energy to different locations. At your local gas station for instance they might have three of four hydraulic lifts for raising cars, but they will need only one pump to work the four lifts instead of needing 4 pumps for 4 lifts. The key word is transfer of energy. He still has to pay the electric bill to run the electric motor that is attached to the hydraulic pump.
Nuclear energy is a way to generate power by harnessing the energy stored in the atom.
Nuclear power and hydraulics are two separate entities. Hope this explained it well enough. Argonne National Laboratory, Division of Educational Programs, Harold Myron, Ph.D., Division Director.