wz94/Shutterstock When you're onboard what is essentially a massive floating city, isolated in the middle of the ocean, logistics like resupply can be a massive nightmare . Refueling is also staggeringly expensive. A conventionally powered aircraft carrier like the (now retired) USS Kitty Hawk requires up to 700,000 barrels of oil a year. At the current price of oil, $83.46 per barrel, that's more than $58 million per year, or slightly over $160,000 every day. Conventional fuel also takes up a massive amount of space, and coordinating delivery and refueling with supporting vessels adds further logistical challenges and expense. With all those factors in mind, the appeal of nuclear power becomes pretty obvious.  Nuclear reactors can operate for 20 years or more without ever needing to be refueled (though when necessary, that refueling process is a huge undertaking ), and they're also smaller than traditional generators and their required fuel stores.…