A simulation study of a proposed blanket design for a D-T fusion reactor

In this paper we have reported a simulation study of a new blanket design for a D-T fusion reactor. The conceptual design of the proposed blanket is an extension of the one given by Takada et at. We show that to enhance tritium breeding capability 14 MeV neutrons should be slowed down to very low (cold neutron) energies before they are absorbed in ʹHe. We have used the multigroup diffusion equation and eigenfunction expansion method to calculate space dependent neutron spectra and Tritium Breeding Ratio (TBR) in a slab of lHe+C at natural as well as higher densities of ʹHe. We find that TBR shows a substantial increase with increase in density of ʹHe and/or the fraction of sub-Bragg neutrons in a source. When density of ʹHe is IO times its natural value, TBR attains a saturation value of about 1.2 for a breeding region of thickness about 2 em when sub-Bragg fraction in the source is 10ʹ times their number in a 300 K Maxwellian