Examination Of Validation Of Gaussian Model On The Coastal Nuclear Power Plant's Site

Electric energy has produced increasingly by nuclear power plant since 1960's, and the volume of nuclear power was increased rapidly. There is 17.3 percent of energy developed from nuclear power plant in the world until 1993. There are several nuclear power plants were built in succession on the coastal of our country from 1980's. With the construction of nuclear power plant, it made rapid progress in our research of nuclear energy; in substance it relived the press of power provided in the east part of our country, and the modern development of this site will benefit from it.As the nuclear energy has its characteristic, the government and the international organization lead to pay close attention to its safety and the influence of environments.At present, the Gaussian model of atmospheric diffusion is commonly used in both normal and accident condition not only in domestic but also in foreign guides for nuclear power plant. The validation of the Gaussian model is tested for the plain terrain and the terrain of major roughness, but not for the complex terrain like the coastal sites that have built nuclear power plants of our country. So the purpose of the paper is whether the validation of the Gaussian model on the coastal nuclear power plant with complex terrain is examined. The studies on the data of SF6 tracer tests on the Jiangsu Tianwan,Fujian Huian and Qinshan nuclear power plant's site. Ten sets of SF6 tracer tests were done in Tianwan nuclear power plant in August, 1997, in which the height of release was totally 90m and the atmospheric stability was totally D. Fifteen sets of SF6 tracer tests were done in Huian nuclear power plant in July, 2002, in which the height of release is 70m (5sets), 30m (6 sets), 10m (4 sets), and the stability of atmosphere was B～C, D, E. Seven sets of SF6 tracer tests were done in Qinshan nuclear power plant in July, 2003, in which the height of release was totally 62.5m and the stability of atmosphere was B～C, D, E. By calculating and analysis with the validation examine, we can conclusion. It will be very helpful for future use the Gaussian model on the coastal site with complex terrain.The Gaussian model mentioned in the paper involved the Gaussian plume model that knew the track of transfer, the Gaussian plume model for wind direction, and the Gaussian puff model. The methods of validation examine involved the correlation coefficient, accordant degree with error, and the agreements between calculating and measuring values. By analyzing, we can make a conclusion for using the Gaussian model in the sites.The analysis shows, for the agreements between calculating and measuring values, using the Gaussian plume model that knew the track of transfer, the values of accordant factor are less as the accordant proportion reach to 68% than other Gaussian models, at the Tianwan,Fujian Huian and Qinshan nuclear power plant's site. The values are 3.5, 3.0 and 5.1. For other methods of validation examine find the same conclusion. Using of the Gaussian plume model that knew the track of transfer on the coastal site with complex terrain is feasible.The atmosphere is an important pathway for the transport of radioactive discharges from a nuclear power plant to the environment and thereby to man. It is important for estimating the dispersion of radioactive discharges to the influence of environment in the region and the radioactive impact on man. Above all we must know the validation of the atmospheric transferring model, because it is essential for dose analysis, the evaluation of environment, suggestion, conclusion, and resorting to measurement that computing with this model. I think it will be very useful for another pollutant dispersion.