Liquid level monitoring device for reactor core

Abstract

The reactor core level monitoring equipment includes level detector and secondary instrument, its level detector includes electric heater, thermocouple and sealing component welded on the electric heater, the level detector is connected with secondary instrument by means of connector, electric heater cable and signal cable, on the outer wall of electric heater of the level detector the longitudinal recessed grooves with different heights are cut, the thermocouples can be welded in the recessed grooves, and the exterior of the electric heater is equipped with thin-wall case pipe.

Description

technical field [0001] The invention relates to a liquid level monitoring device, in particular to a reactor core liquid level monitoring device. Background technique [0002] The safety of the reactor system is an important issue that must be solved in the design and operation of the reactor. How to monitor its main thermal and hydraulic parameters online during the operation of the reactor is very important to the safety of the reactor. At present, there are many devices (instruments) for liquid level monitoring. The main advantage of the core liquid level monitoring system based on thermal effect is that the system is simple, but there are disadvantages such as long response time and short service life of electric heaters. The "multi-point thermal effect liquid level gauge (ZL97228436.2)" applied by the applicant on October 22, 1997 is also a device that can be used for core liquid level monitoring. Its manufacturing process is simple, easy to mainta...

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Problems solved by technology

At present, there are many devices (instruments) for liquid level monitoring. The main advantage of the core liquid level monitoring system based on thermal effect is that the system is simple, but there are disadvantages such as long response time and short service life of electric heaters.

The "multi-point thermal effect liquid level gauge (ZL97228436.2)" applied by the applicant on October 22, 1997 is also a device that can be used for core liquid level monitoring. Its manufacturing process is simple, easy to maintain, and has versatility. However, since the thermocouple of the liquid level gauge and the electric heater are welded by silver brazing, when it is used to monitor the core liquid level, since the thermocouple is in direct contact with the liquid for a long time, the liquid droplets or bubbles are easy to adhere to the thermocouple and cause measurement. False; due to the long-term scouring of the liquid, the welding part may fall off, which reduces the reliability of the device; due to the high temperature, high pressure and strong radiation environment in the core, when the thermocouple is repaired and replaced, there will be radioactive pollution, and the maintenance is difficult

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