ではまあいくつか夢のあるというかないというか無情な数字を
https://www.globalsecurity.org/military/library/report/gao/nsiad98001/c3.htm

Life-Cycle Costs for Conventional and Nuclear Aircraft Carriers (based on a 50-year service life)
(Fiscal year 1997 dollars in millions)

Ship acquisition cost $2,050 $4,059
Midlife modernization cost $866 $2,382
Total investment cost $2,916 $6,441
Average annual investment cost $58 $129
Operating and support cost
　Direct operating and support cost $10,436 $11,677
　Indirect operating and support cost $688 $3,205
Total operating and support cost $11,125 $14,882
Average annual operating and support cost $222 $298
Inactivation/disposal cost
　Inactivation/disposal cost $53 $887
　Spent nuclear fuel storage cost n/a $13
Total inactivation/disposal cost $53 $899
Average annual inactivation/disposal cost $1 $18
Total life-cycle cost $14,094 $22,222
Average annual life-cycle cost $282 $444