Reflector of fast power reactor and its effect on basic reactor characteristics

The effect of the reflector on fast reactor neutron characteristics was tested using a mathematical model. Test models were compiled using the specifications of a typical reactor of an equivalent output of 15a0 MW. The initial two-dimensional arrangement and its conversion to two one-dimensional models, ie., a cylindrical and a slab models are described. The composition of fuel in the reactor cores and blankets corresponds to a steady state refuelling mode. Program J.126.05 was used for computations. The reflector effect was studied on the following space-dependent variables: integral neutron flux density, fast neutron flux density, specific volume output, fission collision density, and capture collision density. The presence of the reflector mostly affects the spatial distribution of neutron flux and neutron densities in the blanket, this mainly in the vicinity of the blanket-reflector interface. The results are tabulated. (J.B.)