Project of active zone for the reactor of BN-800 type operating without of the reactivity margin under non-intensive control during long time

Parameters of active zone (AZ) and control for reactor of BN-800 type with oxide uranium-plutonium fuel and sodium coolant providing the reactor to operate in the self-adjustable neutron-nuclear regime of second type (SANNR-2) are proposed. In SANNR-2 the reactor operates in regime close to equilibrium one with-out reactivity margin and without refuelling during a long time. Thus the reactor safety and efficiency are significantly enhance. The mathematical simulation of BN-800 active zone has been done in the frame of one-dimensional quasidiffusional dynamic model with two-dimensional neutron leakage taken into account.