Primary loop coolant leakage radiation monitoring system and method

Abstract

The invention discloses a primary loop coolant leakage radiation monitoring system and method. The system comprises a sampling pipeline, a purging pipeline, an exhaust pipeline, an F-18 aerosol detector and an inert gas detector. The purging pipeline and the exhaust pipeline are both communicated with the sampling pipeline, and a sampling inlet, a first stop valve, a second stop valve, a regulating valve, a flowmeter, a third stop valve and a fourth stop valve are sequentially arranged on the sampling pipeline in the airflow direction; a purging inlet, a fifth stop valve, a one-way valve, a sixth stop valve, an aerosol and iodine filter and a seventh stop valve are sequentially arranged on the purging pipeline along the airflow direction; an eighth stop valve, a first sampling pump, a ninth stop valve, a tenth stop valve and an exhaust port are sequentially arranged on the exhaust pipeline in the airflow direction. The method can be effectively applied to containment atmospheric radiation monitoring, the radiation monitoring precision and detection efficiency are high, the radiation monitoring continuity is good, and harm to the environment and human beings is avoided.

Description

technical field [0001] The invention belongs to the technical field of atmospheric radiation monitoring of containment, and in particular relates to a system and method for monitoring the leakage radiation of a primary circuit coolant. Background technique [0002] The nuclear power plant of a pressurized water reactor nuclear power plant is usually composed of two closed circulation loops, called the primary loop and the secondary loop. The primary loop includes the nuclear reactor (sealed in the pressure vessel), the main cooling water pump, the pressure stabilizer, the primary side of the steam generator and other equipment, and the pressure is maintained at 120-160 atmospheres; the secondary loop includes the steam generator, condenser, main cooling water pump , steam generator secondary side and other equipment, the pressure is maintained at 70 atmospheres. The primary loop connects the core and the steam generators in the secondary loop. [0003] In order to ensure t...

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Problems solved by technology

This leakage will have two serious consequences: one is that the reactor cooling water is insufficient, resulting in reactor operation safety accidents;

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