I think modular reactors certainly could be build with some investment and in a different world it might make sense to build lots of them (and if possible under

I think modular reactors certainly could be build with some investment and in a different world it might make sense to build lots of them (and if possible underground, to contain the worst in the worst case). But the required security alone, to prevent the spread of material to all kind of terrorist organisations or rougue states, will likely not make them a economical alternative.