Effect of the Burnable Absorber (Gd) on the Multiplying Coefficient (K_∞) in the Process of Fuel Burnup for Full-Scale and Poly Cells Models for the WWER Reactor

Abstract

The paper considers various concentrations of burnable absorber (BA) Gadolinium (Gd) in the system of compensation of excess reactivity in the reactor of WWER type at the extended campaigns. It is analyzed the influence of the method for the Full-scale and Poly-cells model placing the burnable absorber in the fuel with gadolinium rods (tveg). The strong influence of the BAs composition in the fuel with gadolinium rods (tveg) dependence on the multiplication factor of the fuel burnup is shown.