The Congressional Budget Office (CBO) developed a hypothetical future fleet, based on the Navy's shipbuilding plan, of new destroyers and amphibious warfare ships that are candidates for nuclear propulsion systems. Specifically, CBO chose for its analysis the Navy's planned new version of the DDG-51 destroyer and its replacement, the DDG(X); the LH(X) amphibious assault ship; and the LSD(X) amphibious dock landing ship. CBO then estimated the life-cycle costs for each ship in that fleet—that is, the costs over the ship's entire 40-year service life, beginning with its acquisition and progressing through the annual expenditures over 40 years for its fuel, personnel, and other operations and support and, finally, its disposal. CBO compared lifecycle costs under two alternative versions of the fleet: Each version comprised the same number of ships of each class but differed in whether the ships were powered by conventional systems that used petroleum-based fuels or by nuclear reactors. Read full PDF report at CBO