Naval reactors are very different. They dont, most of them, generate electricity. Thier steam pushes propellers. And they are also self-contained within ships. Getting the power from the reactor to shore is a huge task, the bigger task imho. Naval reactors are also smaller and not as efficient than a civilian reactors. They are biult for different priorities (low manning, variable power, long operation at very low power, decades between refits etc). And they have a failsafe not applicable to a civi reactor near a city: evacuate and sink it to the bottom.