Lattice cell homogenization constant calculation method, system and terminal considering an environmental effect

Abstract

The invention discloses a lattice cell homogenization constant calculation method, system and terminal considering an environmental effect, and relates to the field of nuclear reactor core design and reactor physical calculation; the method comprises the following steps: selecting core neutronics characteristics according to a characteristic parameter conservation principle between uniform core calculation and non-uniform grid calculation; establishing a difference table between the discontinuous factors or the super homogenization factors and the neutronics characteristics of the reactor core; carrying out reactor core rod-by-rod calculation by utilizing an equivalent homogenization constant obtained by calculation of each type of single component problem under a total reflection boundary condition to obtain a reactor core neutronics characteristic quantity corresponding to the reactor core neutronics characteristic in each lattice cell; and performing multi-dimensional linear interpolation processing on the neutronics characteristic quantity of the reactor core according to the difference table, and performing accurate calculation to obtain the lattice cell equivalent homogenization few-group constant. According to the method, the influence of the total reflection boundary condition on the homogenization section without considering the real environment of the reactor core in the lattice cell homogenization constant calculation process is effectively weakened, so that the rod-by-rod calculation precision of the reactor core is improved.

Description

technical field [0001] The invention relates to the field of nuclear reactor core design and reactor physical calculation, more specifically, it relates to a cell uniformization constant calculation method, system and terminal considering environmental effects. Background technique [0002] The PWR core is generally composed of hundreds of fuel assemblies and complex structural materials such as shrouds / reflectors. Each fuel assembly contains hundreds of different types of cells, such as cells for fuel rods, cells for burnable poison rods, cells for water holes, and so on. On the other hand, the energy distribution of neutrons in a nuclear reactor core ranges from 10 MeV for fission neutrons to 10 MeV for thermal neutrons -2 over a wide range of eV. These two factors make direct calculations for finely described reactors expensive and time-consuming. Restricted by the level of calculation conditions and calculation methods, the one-step calculation of three-dimensional fu...

AI Technical Summary

Problems solved by technology

[0005] However, as the spatial grid of the core calculation changes from a coarse grid of component homogenization to a fine grid of cell uniformity, and the homogenization area also changes from an optically thick medium to an optically thin medium, the core calculation is becoming more and more complex. Precise and more complex

Images