What is the main reason to use nuclear reactor on a submarine?

it needs no oxygen
it needs no frequent refuelling
it is silent
it is small
Nuclear reactor requires no oxygen for combustion and emits no exhaust gas. It gives the submarine the ability to operate submerged at high speeds, for unlimited periods, dependent only on the endurance of its crew. Nuclear power revolutionized the submarine, finally making it a true "underwater" vessel, rather than a "submersible" craft.
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Riho Ishii
reach: rather globalnavynuclear energynuclear powersubmarinesweaponryweapons
it needs no oxygen
it needs no frequent refuelling
it is silent
it is small
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