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In a fusion power plant using deuterium-tritium fuel, the system surrounding the plasma vessel, the blanket, has two functions: firstly, to slow down the neutrons produced, so that the heat released can be used for electricity generation. Secondly, in many designs, the blanket is also used to synthesise tritium (from the neutrons and a lithium compound) to use as fuel.
More information on FAQ: What is a lithium blanket and how does it work?