They take a year to build, and can be mobile.
https://en.m.wikipedia.org/wiki/Russian_floating_nuclear_pow...
https://en.m.wikipedia.org/wiki/Russian_floating_nuclear_pow...
I think these kinds of applications have a lot of potential, and are the future of nuclear energy production. But using these kinds of small reactors outside the military (or Russian icebreakers) is an idea that only recently gained traction (at least since it was originally abandoned around the 60s).