Method for calculating activity of radioactive gas diffused to atmospheric environment under accident condition of underground nuclear power station

Abstract

The invention discloses a method for calculating activity of radioactive gas diffused to the atmospheric environment under the accident condition of an underground nuclear power station. The method comprises steps as follows: establishing a radioactive gas diffusion database of the underground nuclear power station through research of existing literature materials; consulting data to acquire source item data of each radionuclide escaped from a reactor building cavern of an underground nuclear power station containment; determining all diffusion paths of the radioactive gas diffused from the reactor building cavern to the atmospheric environment and calculating the concentration of each type of radioactive gas passing each diffusion path; sequentially evaluating the diffusion behavior of the radioactive gas of each path in each diffusion link to obtain the radioactive activity of each radionuclide diffused to atmosphere. According to the method, one set of complete and scientific radioactive gas diffusion evaluation system of the underground nuclear power station is established, quite high universality is realized, calculation software is formed easily through programming, user's use and secondary development are facilitated, and data support is provided for site selection, formulation of a contingency plan and the like of the underground nuclear power station.

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 ...

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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 radi

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