Modular reactors and nuclear-powered ships

Could wider use of modular reactors make nuclear-powered commercial ships successful?

Potentially; a larger modular-reactor industry could lower barriers, and Rolls-Royce designs are a relevant development.

Small modular reactors promise repeatable construction and a broader industrial base than bespoke naval plants. Growth in that sector could lower some barriers facing nuclear-powered merchant ships. Rolls-Royce work is identified as a development worth watching. The answer is cautiously prospective and does not claim that commercial maritime economics are already solved.