Abstract
The shield composition of a D-T burning fusion reactor has been optimized to minimize the shutdown dose rate outside the shield. A method of reducing the shutdown dose from a stainless steel structure is devised. First of all the 14 MeV neutron flux must be attenuated to reduce the products of the (n,p) reactions such as 58Co and 54Mn. Secondly low energy neutrons penetrating through the shield must be decreased to reduce troublesome (n,γr)reaction products such as 59Fe and 51Cr. As the result the criterion of 2.5 mrem/h one day after shutdown outside the shield is shown to be almost satisfied with 1.3 m thick non breeding blanket/shield, and with 1.5 m thick breeding blanket/shield.
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