It's been four decades since my physics edumacation. One forgets much. And at my age, one forgets much more.
But you nailed it. RTG's, the things used on the Voyagers, are not modular nuclears. (Damn! I had to look it up! Google rules.)
Modular reactors are not like V-Ger. 
But they are a hellyva lot safer than what we're doing today with nukes. They are stable and can work for a couple of decades without much maintenance.
But, as I wrote, there's still the problem of getting rid of the waste.
That, above all, is what kills nuclear power. All other considerations are secondary.
As a person trained in physics, I wish it wasn't so. But as one trained in physics I know that it is so. No hope for nuke power
The only hope is modular. But without a recycle plan, it is worse than worthless. Better put resources into solar, wind, and other perpetual resources.
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