Why a British reactor-generation lag is challenged

Is British naval reactor technology three or four generations behind the United States?

The claim is rejected because Britain and the United States cooperate closely on reactor development, with Rolls-Royce participating in that shared work.

Close British-American cooperation in reactor development challenges the claim that Britain is three or four generations behind the United States. Rolls-Royce's work with American reactor designers is characterized as a longstanding joint effort. Its position inside American defence industry is compared with the participation of American firms in British defence. The rejection rests on that shared development relationship rather than a detailed comparison of individual reactor designs.