Automatic control system and method for emission monitoring of radioactive airborne effluents

Abstract

The invention discloses an automatic control system and an automatic control method for mission monitoring of radioactive airborne effluents. According to the automatic control system, an emission flow monitoring sensor is connected with a flow monitoring PLC (Programmable Logic Controller) through a cable; the flow monitoring PLC is connected with an automatic control unit through a signal line; the automatic control unit is connected with a flow adjusting valve, an electromagnetic valve, sampling monitoring equipment, a mass flow meter, a pressure gauge and a pump respectively through a signal control line; and an airborne substance sampling head is connected with a tail gas emission pipe after being connected with the flow adjusting valve, the electromagnetic valve, the sampling monitoring equipment, the mass flow meter, the pressure gauge and the pump respectively in sequence through a sampling pipe. Due to the adoption of the automatic control system and the automatic control method disclosed by the invention, the sample representativeness of effluent monitoring under the conditions of separate or simultaneous emission, large differences among airborne substance source items and scattered emission in a plurality of radioactive operating places can be enhanced, the labor intensity of effluent monitoring can be relieved, and the working efficiency is increased; and the system and the method have the characteristics of stability, reliability, intelligent regulation and control, and unattended operation.

Description

technical field [0001] The invention belongs to the technical field of radiation protection and environmental protection, especially for the centralized discharge monitoring process of radioactive waste gas (fine dust aerosol, iodine aerosol, tritium, etc.) in multiple radioactive operating places or experimental halls and involving multiple ventilation and exhaust systems The automatic sampling control method of airborne substances. Background technique [0002] Nuclear facilities, nuclear installations, production lines and other radioactive workplaces involve the discharge of radioactive airborne substances to the environment under normal and accidental conditions. In order to control and evaluate the radiation impact of radioactive airborne substances on the surrounding environment and the public, the national standard GB18871-2002 Whether the source term of airborne effluents generated in radioactive sites discharged into the environment meets the discharge limit value ...

AI Technical Summary

Problems solved by technology

At present, in view of the situation that multiple radioactive sites are built on the same site, according to the requirement of "unified effluent monitoring" in the four unifications proposed by the Ministry of Environmental Protection, the discharge of airborne materials is usually carried out by multiple nuclear facilities (devices), The waste gas generated in radioactive places such as production lines is discharged to the environment through a single chimney. Due to the differences in the radioactivity concentration and total amount of airborne substances, the working mode of the ventilation and exhaust system, and the size of the exhaust air in different radioactive places, the effluent monitoring is based on the current general Neither continuous sampling nor regular sampling monitoring is feasible. For example, the effluent monitoring cannot reflect the discharge conditions of airborne substances in various radioactive sites, and the monitoring results cannot truly and objectively reflect the airborne discharge of chimneys to various radioactive sites. source term

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