do we know how expensive (per unit energy) US Navy reactors are? It doesn't matter how safe they are if they are twice as expensive as renewables

do we know how expensive (per unit energy) US Navy reactors are? It doesn't matter how safe they are if they are twice as expensive as renewables (plus storage / power-to-gas). Renewables (and fusion, although that's arguably a renewable) are obviously the end goal but until they can fill 100% of our energy needs the real cost comparison needs to be "the cost of nuclear" versus "the cost of fossil fuel plus the cost of the damage done by fossil fuels."