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Description
The aim of the work is to investigate the neutron induced reactions in a massive target for ADS as a function of neutron moderators, where MCNP6 transport code is used. The ADS (Accelerator Driven System) contains three main parts: 1). Target, where the proton beam delivers its energy, 2). Nuclear fuel and cooling system, 3). Accelerator. Irradiation of the target by a relativistic proton beam generates high energy neutron flux in the central part of the target and a small part of the flux delivers its energy in the nuclear fuel. The keff of the fuel is in the range 0.9-0.95. For moderation (reflection) of the neutron flux, beryllium and lead are used. The cooling system modified the neutron flux too. The helium and liquid sodium are used as a coolant in nuclear facilities. In the work are simulated modification of high energy neutron flux in the targets and nuclear fuel in case of different cooling systems.
