Numerical value simulating method for nuclear facility waste gas diffusion

Abstract

The invention belongs to the technical field of numerical value simulation, and particularly relates to a mumerical value simulating method for nuclear facility waste gas diffusion under the support of a GIS. The method includes the following steps of firstly, data preprocessing; secondly, simulation calculating; thirdly, GIS simulation output. The first step includes the substeps of firstly, digitally forming a layer of a data table, importing the data table in a database, and discretizing the data table into control point data and grid layer data; secondly, establishing an (x, y, z) coordinate system according to the dosage of waste gas; thirdly, establishing a coordinate system according to meteorological data, and determining the range of a pollution area. The second step includes thesubsteps of firstly, imputing the data preprocessed in the first step in a nuclide diffusion model, and establishing an optimal model; secondly, obtaining absolute coordinates and concentration data of grid central points; thirdly, calculating the time-varying result of nuclide concentration data under the same coordinates. The method can simulate the pollution risk space, quantify the evaluatingresult and provide the technical support for related decision making.

Description

technical field [0001] The invention belongs to the technical field of numerical simulation, and in particular relates to a numerical simulation method for nuclear facility waste gas diffusion supported by GIS. Background technique [0002] In the production and consumption of nuclear energy, there will be wastes that cannot be recycled or are not worth recycling under the current technology. According to the physical properties of these wastes, they can be divided into airborne waste, liquid waste and solid waste. The radionuclides contained in airborne waste vary with the facilities. The main nuclides in the exhaust gas of uranium mining and smelting plants are uranium, thorium, radium, radon and their daughters. The main components of exhaust gas in nuclear power plants are inert gases, aerosols , 3 H and 14 C. Exhaust gas from reprocessing plants often contains 239 Pu, 226 Ra and 222 Rn, the reactor produces iodine waste gas. In addition, the exhaust gas may also c...

AI Technical Summary

Problems solved by technology

However, due to ignoring the interference of background radioactivity near the site, there are inherent simulation errors, which will cause large errors in the simulation of trace nuclide diffusion;

[0006] Second, the diffusion simulation ignores the micro-environment of nuclear facilities

Existing experimental methods and numerical simulation techniques, based on empirical simulation and pure mathematical calculation, cannot effectively introduce terrain, landform and underlying surface type as parameters into the diffusion model

However, the nuclide content in the exhaust gas of nuclear facilities is at a trace level, and the reliability of the simulation is questionable when the local small environment is ignored.

[0007] Third, the level of informatization is insufficient

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