> per-unit cost of nuclear power plants is extremely high
Unless you are the US Navy. It probably helps that they churn out dozens of the same few cookie-cutter designs without needing permission from NIMBYs.
Honestly not a terrible idea. Just have your reactor on a huge barge and if it goes meltdown just drag it out into international waters and let the fish deal with it /s
Those reactors were also very expensive, though, weren't they? I've heard lots of people look to them as a reason that SMRs might work, but not because the naval reactors were cheap. Plus they use uranium enriched to levels that we typically don't allow in civilian reactors...