The breeding blanket is the only place to produce tritium (T) in a fusion reactor. It is necessary to recover bred T in the blanket effectively because no T in the natural resources is usable as the fuel in a fusion reactor. Fortunately, T can be produced by the reaction between neutron and lithium in the blanket placed surrounding the fusion chamber with. The T breeding ratio attainable in the blanket should be large enough to cover whole T consumed for steady operation of a fusion reactor. In this chapter, T breeding in a blanket zone and the evaluation method of the T breeding ratio are introduced.
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