John Snow

They have 2 CONAS combination nuclear/Steam Reactors.

It is 2 KN-3 Nuclear Reactors with traditional steam power, then they have 2 extra GT3A-688 Steam Turbines in case of reactor failure.

Nuclear reactors generate about 140 000 hp and they have unlimited range in 30 knot with reactors, with Steam Turbines they have fuel for 1000 miles in 17 knot.

I hoped it helped :)