Lagrange puff atmospheric diffusion simulation method in nuclear accident off-site consequence evaluation

Abstract

The invention discloses a Lagrange puff atmospheric diffusion simulation method in nuclear accident off-site consequence evaluation. A Lagrange mesoscale atmospheric diffusion puff mode is used for calculating the concentration and the dosage of gaseous radioactive materials in each grid point of an evaluation area, and a land-surface and inhomogeneous unstable change meteorological condition of a medium complex degree can be favorably processed. On an appointed grid, one series of Gaussian puff is released to simulate the change of nuclide along with time, and the accident situations of a plurality of releasing points can be simulated in the same time period. The method cites the calculation of aspects including diffusion parameters related to stability, plume rise, thermal inversion layers, ground reflection, dry and wet source item depletion and the like; and under a complex topographic condition, puff division is adopted to process a puff furcation problem, and a mesoscale simulation result more approaches to a practical environment condition. By use of the method, the instantaneous concentration of the nuclide in near ground air, time integral air concentration, ground deposition concentration, smoke plume, the [Gamma] dosage rate of ground deposition and the like can be calculated.

Description

technical field [0001] The invention relates to the technical field of nuclear facility accident consequence evaluation, in particular to an airborne radionuclide Lagrangian puff atmospheric diffusion simulation method in nuclear facility accident off-site consequence evaluation. Background technique [0002] When a nuclear power plant or other nuclear facilities seriously deviates from normal operating conditions or an accident occurs, the release of radioactive substances may or has lost proper control and reached an unacceptable level, which will cause serious consequences. Therefore, it is of great strategic significance to prevent, control and analyze the hazards of nuclear facility accidents. [0003] Nuclear Facility Accident Consequence Evaluation System is an evaluation system that integrates regional meteorological data, radioactive pollutant migration mode and consequence evaluation, and is used to estimate, evaluate and display accident consequences within a spec...

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Problems solved by technology

[0002] When a nuclear power plant or other nuclear facilities seriously deviates from normal operating conditions or an accident occurs, the release of radioactive substances may or has lost proper control and reached an unacceptable level, which will cause serious consequences

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