Nuclear power plant radioactive exudation monitoring system

Abstract

Provided is a nuclear power plant radioactive exudation monitoring system which comprises an airborne radioactive exudation monitoring system. The airborne radioactive exudation monitoring system comprises a heating unit. The heating unit is used for heating gases in a part, outside a chimney, of a sampling pipeline where an aerosol and iodine monitor in the airborne radioactive exudation monitoring system is located, and a part, outside a chimney, of a sampling pipeline where an aerosol and iodine sampler is located. The nuclear power plant radioactive exudation monitoring system may prevent aerosol and iodine steam condensation caused by a decrease in ambient temperature and may increase aerosol and iodine acquisition efficiency. Further, a compressor is arranged on the upstream of an inert gas sampling bottle so as to increase gas concentration. In a high radioactivity monitoring system, a lead shielding device is arranged outside the inert gas sampling bottle and the aerosol and iodine sampler in order to improve protection of workers against radiation. A liquid radioactive exudation monitoring system is improved, simplified in structure, and decreased in fault links. A flowmeter is provided in order to compute total discharge activity.

Description

technical field [0001] The invention relates to the field of nuclear power plants, in particular to a nuclear power plant radioactive effluent monitoring system. Background technique [0002] Airborne radioactive effluents and liquid radioactive effluents from nuclear power plants have a corresponding annual discharge control limit, where airborne radioactive effluents include aerosols, iodine, inert gases, 14 C. 3 H, Liquid radioactive effluents include 3 H. 14 C and other nuclides. [0003] refer to figure 1 , the gaseous effluent is continuously discharged to the environment through the exhaust chimney of the nuclear island powerhouse. A sampling head 1 is set in the chimney 10 to continuously sample the effluent. The aerosol monitor 2, the iodine monitor 3, and the low-range inert gas monitor 4 are the Continuously monitor the activity concentration of aerosol, iodine, and inert gas under normal operating conditions. The high-range inert gas monitor 5 is used for re...

AI Technical Summary

Problems solved by technology

This kind of monitoring system has a complex structure and cumbersome maintenance, which is not conducive to reducing the occupational exposure of maintenance personnel; moreover, it can only monitor the activity concentration of waste liquid, and cannot calculate the total discharge activity; the measurement chamber 11 cannot be emptied naturally, and radioactive pollution is easy to accumulate. The background cannot be automatically deducted during the first emission, which affects the measurement accuracy; false alarms in the non-emission state cannot be avoided

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