Source item release inversion and diffusion prediction method based on integrated atmospheric diffusion model

Abstract

The invention provides a source item release inversion and diffusion prediction method based on an integrated atmospheric diffusion model, and the method comprises the steps: 1, integrating three atmospheric diffusion models: CFD, Aermod and Calpuff, and enabling the three atmospheric diffusion models to be used for the analog calculation of different scales; 2, based on the concept of a smoke plume emergency planning area, carrying out modeling in advance by independently adopting three atmospheric diffusion models including CFD, Aerod and Calpuff for a near area, namely, an inner area of 5 km and an outer area of 10 km, of the nuclear power plant; 3, simultaneously storing various typical wind field calculations, various accident source items and release rules thereof, and concentrationchange rules monitored or simulated at feature positions in various accident scenes in a database; and step 4, when a radioactive leakage accident occurs, automatically inverting a release position and an accident type according to a concentration change rule at the characteristic position, quickly calculating a diffusion direction, a diffusion range and a severity degree of future pollution basedon real-time weather forecast information, assisting a decision maker to directionally issue an early warning in advance, and making an emergency response scheme.

Description

technical field [0001] The invention relates to the field of environmental prediction, in particular to a method for inversion and diffusion prediction of source release based on an integrated atmospheric diffusion model. Background technique [0002] After the Fukushima nuclear accident, source term inversion has become an important quantitative calculation and analysis method for the source term of reflective release from nuclear accidents. The source item of radioactive release in a nuclear accident describes the radioactive release method, the type and total amount of radioactive substances, and is an important basis for determining the classification of nuclear accidents, evaluating the radiation consequences of nuclear accidents, and taking corresponding emergency measures. The radioactive release in nuclear accidents is mainly gaseous radioactive release, including two main release modes: through the chimney and without the chimney. Nuclear power plants are equipped ...

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Problems solved by technology

According to the above calculation process, it can be known that the method of the existing technology belongs to the traditional reverse traceability model of "event occurrence-analysis of causality-taking countermeasures". However, this method mainly focuses on the long-term environmental monitoring data after the accident and the global The scale propagation model is used to estimate the accident source item. Due to the large uncertainty of the early detection data of nuclear accidents, and the transmission model of mesoscale radionuclides is more complex than the large-scale model, there are limitations in its use

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