The reactor woukd be pretty heavy but if assembled in space, and if mounted at the rear of a truss away from the habitat module there should be little to worry about. However, as proof of concept these drives should be used for non-manned probes initially, say to ferry sensor/robot packages to Europa, etc, or carry supplies to the Moon and Mars for habitate building. Why not put one on a probe to the Tau Ceti system, just 12 LYs away; many of us would still be alive when it got back. Stop thinking of the politics of nuclear power, and look at the opportunities this could represent. Our future is off this world.
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