Radiation dose evaluation of airborne radioactive material in conventional operating conditions of nuclear power plant calculation and comparison of results

In this paper, air-immersion external radiation of airborne radioactive effluent released from nuclear power plant under normal operating conditions is studied according to the atmospheric diffusion and ground deposition patterns and parameters suitable for the environmental characteristics of the site of the nuclear power plant, and the public living habits around the site, food chain parameters, Ground deposition external irradiation, ingestion inhalation, and inhalation of air, and based on the Gaussian plume model, the radius of the nuclear power plant site is 80 km, the radius of division is 1, 2, 3, 5, 10, 20, 30, 40, 50, 60, 70, 80 km concentric circles, the axial 16 compass azimuth for the sector centerline, a total of 192 sub-regions of the regional assessment of radionuclide atmospheric diffusion simulation, the use of nuclear power plant site And the surface wind direction, wind direction, rainfall and atmospheric stability of the meteorological tower and the ground station, taking into account the ground reflection during transmission, and the loss of the wet and dry deposition caused by the decay of the radionuclide, gravity and rain washing. Of the annual mean atmospheric dispersion factor. The airborne radioactive effluent is deposited on the ground or plant surface by dry deposition and wet deposition in the process of atmospheric environment migration and diffusion. Deposition rate and wet deposition coefficient are used to describe the dry deposit per unit area and the radioactivity, The long-term ground deposition factor and ground annual concentration in the evaluation area were calculated, and the calculated radionuclide concentration in the air and soil was compared with the natural background value and the actual monitoring Values. The airborne, radionuclide deposited on the ground through the terrestrial food radioactive transfer model, combined with the nuclear power station within 80 km of population distribution, agriculture, farming, animal husbandry and the law of life, eating habits and a large number of environmental surveys Data, according to the actual situation of nuclear power plants, the calculation model is amended accordingly, the use of reasonable dose model to calculate the residents of the region to assess the maximum individual effective dose and the collective annual effective dose of the public and the results with other human And compared the calculated results of radionuclide concentration and radiation dose in order to understand the influence of nuclear power plant on the surrounding radiation environment, and provide quantitative reference information to meet the requirements of nuclear power plant under normal operating conditions. Environmental and public radiation dose caused by the impact. (authors)