Neutronic calculations for the 1, 3 and 5 GeV energy proton in accelerator driven system using monte carlo method

In this study, proton beam that has 1,3 and 5 GeV energy was sended to 70 cm long and 20 cm radiuses natural lead target through a stainless steel pipe with 5,3 cm radius in Accelerator Driven System. In this system, there is a component which is called as reactor vessel that it is cylindrical shaped with 230 cm radius and 460 cm height, made of graphite and it?s covered with 40 cm thick reflector from inside. This reactor is surrounded by special stainless steel 2 cm thick as shield which made of the material (HT9) and liquid sodium is used as coolant. In this thesis we calculated using by MCNPX software the ?number of particles? produced per proton, particles fluxes depending on energy, radius and height, the neutron leakage and, heating and gas production for the 1, 3 and 5 GeV energy proton beam and finally we analyzed the obtained by these calculations.