The large size of nuclear reactors is often one of the factors blamed for their high cost. Small Modular Reactors (SMRs), which could be manufactured in factor

The large size of nuclear reactors is often one of the factors blamed for their high cost. Small Modular Reactors (SMRs), which could be manufactured in factories rather than in bespoke, on-site builds, are regarded as a technology that could bring down the cost of nuclear builds in future. I suspect submarine reactors are expensive because of their unique design constraints, relatively small production runs, and the fact that they are contracted/built on military budgets rather than in competitive commercial environments.