Method and a system for estimating near-distance diffusion parameters of a nuclear power plant site

Abstract

The invention discloses a method and a system for estimating short-distance diffusion parameters of a nuclear power plant site. The method comprises the following steps: S1, selecting year-round conventional hour-by-hour meteorological observation data of an iron tower of the nuclear power station plant site; s2, estimating the ground roughness of a factory site according to the meteorological observation data; s3, calculating the annual hourly turbulent flow energy, the turbulence characteristic length scale and the Rich's number of the factory site, and further calculating the correspondingturbulence pulsation speed and the Lagrangian time scale; s4, substituting the turbulence pulsation speed and the Lagrangian time scale obtained through calculation into a Taylor formula, and solvingcorresponding diffusion parameters; and S5, carrying out curve fitting on the diffusion parameters of the factory site year by year and the corresponding Rush's number, carrying out stability divisionon weather conditions according to the Rush's number, and selecting the minimum diffusion parameter in each stability interval as the diffusion parameter under the type of stability. The method and the system provided by the invention are easy to implement; and the calculated diffusion parameters are established on the whole-year observation data, so that the representativeness is relatively comprehensive.

Description

Technical field [0001] The present invention relates to the field of nuclear environment, in particular to a method and system for estimating close-distance diffusion parameters of a nuclear power plant site. Background technique [0002] At present, the methods for evaluating the migration and diffusion of airborne radioactive materials released by nuclear facilities mainly include Euler's method and Lagrangian method. A large part of the Lagrangian method requires the diffusion parameters of the nuclear facility site as input. Evaluate the migration and diffusion of radioactive materials. In actual work, the evaluation methods of diffusion parameters mainly include the following two: 1) Atmospheric diffusion tracer experiment. Generally, atmospheric tracer is released at the plant site, and the atmospheric diffusion parameters of the dominant wind downward are estimated based on the sampling results. This method is close to In practice, but the experimental period is long and ...

AI Technical Summary

Problems solved by technology

This method is cheaper than the atmospheric diffusion tracer experiment, but the three-dimensional turbulent fluctuation observation equipment is expensive and fragile, and it is only used for observations of tens of days or months in practice, and it cannot be deployed at multiple sites and for a long time

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