What in the actual **** are you talking about? Nuclear-powered subs aren't dangerous because they run on nuclear power. They're dangerous because they have nuclear warheads on board. Just having a Reaper FTL drive would do nothing to even the odds against the Reapers. Even if we had faster FTL drives than the Reapers the only advantage it would yield is being able to escape the Reapers in space more easily.
Apart from yours being a categorically hilarious claim that ignores the advantage that nuclear powered subs have in never needing to surface and expose themselves to charge diesel-electric batteries (and therefore even making SLBM's an effective part of the Nuclear Triad), who mentioned subs? Many classes of modern vessels run on nuclear power due to its advantages. Only a retarded person could ignore obvious advantages in power, speed, available displacement, reliability and range (with the primary disadvantage being high costs).
Having faster, more manuverable and larger vessels with heavier payload and larger combat radius is a tactical boon. You clearly have no idea what I nor you are talking about, as usual. Educate yourself at least a little, please.
https://en.m.wikiped...ki/Nuclear_navy
and then retry to counter the analogy, keeping in mind the advantage with Reaper drives is even larger. Hypothetically, giving first dibs on the latest, greatest naval proplulsion advantage to goddamn Jeac Cousteau instead of putting it on your military aircraft carriers or subs is dumb, dumb, dumb.
Like"ah, yes Reapers" dumb, which probably explains it.