Method and device for reconstructing burn-up characteristics of reactor core lattice cells

The invention belongs to the technical field of nuclear power, and particularly relates to a reconstruction method and device for burn-up characteristics of reactor core lattice cells. The neutron flux of each energy group in each segment divided in the axial direction of the reactor core assembly and the microscopic cross section of each energy group are determined by adopting a neutron diffusionmodel, and microscopic burnup calculation of a lattice cell level fine grid is carried out on the reactor core by adopting a modulation method. And thus, parameters such as the microscopic reaction rate and the important nuclide nucleon density in the lattice cell can be obtained more accurately. Compared with a neutron transport model, the neutron diffusion model is small in calculation amount and high in speed, so that a large number of calculation resources can be saved, efficient calculation can be realized, parameters such as the microcosmic reaction rate and the important nuclide nucleon density in a lattice ce