Calculation method for the activity of radioactive gases diffused into the atmosphere under the accident conditions of underground nuclear power plants

Abstract

The invention discloses a method for calculating the activity of radioactive gas diffused into the atmosphere under the accident working condition of an underground nuclear power plant. Source item data of each radionuclide in the reactor building cavern; determine all diffusion paths of radioactive gases from the reactor building cavern to the atmosphere, and calculate the concentration of each radioactive gas passing through each said diffusion path; evaluate each path in turn The diffusion behavior of medium radioactive gases in each diffusion link is used to obtain the activity of each radionuclide diffused into the atmosphere. The invention establishes a complete and scientific radioactive gas diffusion evaluation system for underground nuclear power plants, which has strong versatility, is easy to form calculation software through programming, is convenient for users to use and secondary development, and is useful for underground nuclear power plant site selection and emergency planning. Formulate and provide data support.

Description

technical field [0001] The invention relates to the field of radiation safety of underground nuclear power plants, in particular to a method for calculating the activity of radioactive gases diffused into the atmospheric environment under accident conditions of underground nuclear power plants. Background technique [0002] During the operation of nuclear reactors, the discharge of radioactive substances is inevitable. Among them, the gaseous radionuclides will be carried out of the reactor building with the gas leakage, and diffuse into the surrounding environment with the atmospheric movement. When an accident occurs in a nuclear power plant, especially in severe accidents, a large amount of radioactive gas will be released into the atmosphere, posing a huge threat to the safety of surrounding workers and the public. Therefore, the evaluation of the diffusion behavior of radioactive gases in nuclear power plants is an important basis for evaluating the radiation doses of ...

AI Technical Summary

Problems solved by technology

If the radioactive gas cannot be processed in time, it will lead to an increase in the pressure in the cavern, which may cause airborne radiation to diffuse through the sealed isolation system into the atmosphere

However, there is no operating experience of underground nuclear power plants or relevant models to evaluate whether the sealed isolation system can prevent the leakage of radioactive gases, and important parameters such as the type, concentration and duration of radioactive gases diffused into the atmosphere are also unknown

Moreover, there are many ways and paths of radioactive gas diffusion in underground nuclear power plants, and the calculation process involves many complex models, making the evaluation process of radioactive gas diffusion very difficult.

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