Method for predicting and calculating radionuclide atmospheric diffusion track set in accident

Abstract

The present invention relates to the technical field of impact assessment on the radionuclide atmospheric environment and particularly relates to a method for predicting and calculating a radionuclide accident atmospheric diffusion track set. According to the method, a wind field driving data set, diffusion parameter sets under different stabilities and a data set of different radioisotope source items are calculated and a calculation mode of driving atmospheric diffusion in a release mode is combined to obtain a set of different radionuclide concentrations in ground release or elevated release and feature values of sets of different and all radionuclide concentrations are given out; and different radionuclide concentrations and all the radionuclide concentrations are subjected to spatial interpolation by utilizing an interpolation method so as to obtain atmospheric diffusion track spatial distribution set prognostic maps at different release time. The calculation method is scientific and reasonable, has high applicability, is an important technical means for impact assessment on the radionuclide environment and has the important significance in the technical field of impact assessment on the radionuclide atmospheric environment.

Description

technical field [0001] The invention relates to the technical field of radionuclide atmospheric environment impact assessment, in particular to a set prediction calculation method for radionuclide accident atmospheric diffusion trajectories. Background technique [0002] When an accident occurs in a nuclear power plant, a large amount of radioactive substances will migrate to the environment through atmospheric diffusion. In view of the needs of radiation protection and environmental protection, it is necessary to evaluate the concentration of effluents that may be released under accident conditions in nuclear power plants. The environmental impact assessment method for nuclear power plants provides a method for calculating the dispersion of radioactive substances released by nuclear power plants into the atmospheric environment area. [0003] However, the existing methods for calculating the atmospheric diffusion of radionuclides during accidents have the following problems...

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Problems solved by technology

[0003] However, the existing methods for calculating the atmospheric diffusion of radionuclides during accidents have the following problems. On the one hand, the wind field data used in the calculation is the annual average three-dimensional joint frequency of wind speed, wind direction and atmospheric stability; secondly, the diffusion parameters used in the calculation Does not reflect site-specific characteristics; on the other hand, only the atmospheric dispersion factors at the boundary of the restricted area and the low population density boundary are calc

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