….. Advanced Modular Reactors are unlikely to be available before 2045 if ever – much too late to be any help in tackling the climate emergency. .…. Small Modular Reactors s will only proceed if the risk to RR money is minimal. That means RR will only put serious effort into design development with government guarantees given now, before the design exists, and it has been reviewed by ONR, a demonstration plant has been completed, and costs are known. SMRs will only proceed if the risk to RR money is minimal. That means RR will only put serious effort into design development with government guarantees given now, before the design exists, and it has been reviewed by ONR, a demonstration plant has been completed, and costs are known.