I think the end goal with small modular reactors is to shrink them down to around the size of of 18 wheel trailer (about the size of packed oil rig base) and manufacture them at one facility for sale and transport to a final location. The issue I see is when many of these reactors are built who's to say that one does not end up in a place like North Korea and they try to build a submarine around it or try to harvest the fuel to make a nuclear or a dirty radiation bomb. So in essence the number of customers would be limited and certain powerful state actors would like assurances that they could not be weaponized increasing the complexity and cost.
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