In the navy the nuclear rods had to be replaced because they needed to never be in the situation where you have a shutdown and then are unable to immediately restart the reactor because of decaying poisons. Saving 20 years of fossil fuel is great, but the cost of the uranium washes that out and the added cost of operating a nuclear plant makes the CVN more expensive per mile than the CV. Why do nuclear carriers then? Because they carry more jet feul, bombs, and can operate much longer without resupply.
This is why we need nuclear F150s just to stay on topic
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