An Efficient Parallel Scanning Method for Building Shielding Calculation in Nuclear Power Plants

Abstract

The invention discloses an efficient parallel scanning method for nuclear power plant shield calculation. According to the method, a continuous plant shield calculation model is discretized through a fine grid, meanwhile, a find grid region is distributed to a plurality of CPUs, a grid on each CPU is divided into a plurality of parallel units along the axial direction, all the CPUs are coupled together through communication between the parallel units, a two-dimensional grid sub-region is divided into a shape like the Chinese character mi (meaning rice), each CPU sub-region has a self-determined octant scanning order after division, all octants are divided into four groups, angles in the four groups of octants are scanned from four angular points of the two-dimensional grid sub-region to the center at the same time, blocking and non-blocking communication is fully utilized in combination with an internal boundary condition, and therefore convergence and high efficiency of parallel calculation are guaranteed. The method is suitable for large-scale cluster parallel calculation, so that three-dimensional neutron and photon flux distribution of a nuclear power plant is obtained quickly and accurately.

Description

technical field [0001] The invention belongs to the technical field of nuclear power plant building shielding calculations, and in particular relates to a high-efficiency parallel calculation method for calculating the fine distribution of three-dimensional neutron and photon flux densities in a nuclear power plant building. Background technique [0002] The distribution of neutron and photon flux density in nuclear power plant building is very important to the safety and economy of the whole nuclear power plant. The irradiation of neutrons and photons will not only deteriorate the material properties of various equipment in the reactor building, but also affect the health of nuclear power plant workers. The shielding calculation of the nuclear power plant building is to accurately obtain the neutral and photon flux distribution of the plant. Therefore, shielding calculation has become a crucial part of nuclear power plant design. [0003] Due to the large volume of the nu...

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Problems solved by technology

The application with the application number 201610471985.5 proposed a parallel scanning method applied to the reactor core shielding calculation. This method decomposes the three-dimensional geometry into two-dimensional areas, which improves the parallel efficiency. However, each calculation only contains one angle, which is still Unable to meet the needs of large-scale shielding calculations in the entire plant

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