阅读说明：本技术 一种核电站乏燃料水池综合监测系统和方法 (Comprehensive monitoring system and method for spent fuel pool of nuclear power station ) 是由 吴斌 陆振国 李晓涛 安景 李宗山 朱建军 刘琢 于 2019-10-24 设计创作，主要内容包括：本发明提供一种核电站乏燃料水池综合监测系统和方法,包括用于采集并传送水池多个标高的温度信号和多个基于热扩散原理的开关量液位信号采集组件；用于探测乏燃料水池液位的模拟量液位探测器；用于接收温度信号、热扩散式液位信号和模拟量液位探测器的液位信号,并根据接收的热扩散式液位信号来判断接收的温度信号是否为有效的水温信号,以及显示水池液面高度和水温的处理变送单元。本发明对乏燃料水池液位测量采用了热扩散式和导波雷达多样化测量技术,实现了各种工况下都可确切获知乏燃料水池的液位,保证乏燃料水池的安全；同时热扩散式液位测量的不加热元件可以同时测量不同标高的水温,可以准确侦知水池的不同标高是否有热点并且可靠性高。(The invention provides a comprehensive monitoring system and method for a spent fuel pool of a nuclear power station, which comprises a plurality of switching value liquid level signal acquisition assemblies, a plurality of temperature signals and a plurality of switching value liquid level signal acquisition assemblies, wherein the switching value liquid level signal acquisition assemblies are used for acquiring and transmitting a plurality of standard temperature signals of the pool; the analog quantity liquid level detector is used for detecting the liquid level of the spent fuel pool; and the processing and transmitting unit is used for receiving the temperature signal, the thermal diffusion type liquid level signal and the liquid level signal of the analog quantity liquid level detector, judging whether the received temperature signal is an effective water temperature signal according to the received thermal diffusion type liquid level signal, and displaying the liquid level height and the water temperature of the water pool. The invention adopts the thermal diffusion type and guided wave radar diversified measurement technology for the liquid level measurement of the spent fuel pool, realizes that the liquid level of the spent fuel pool can be exactly obtained under various working conditions, and ensures the safety of the spent fuel pool; meanwhile, the water temperature of different elevations can be measured simultaneously by the non-heating element of the thermal diffusion type liquid level measurement, whether hot spots exist at different elevations of the water pool can be accurately detected, and the reliability is high.)

1. The utility model provides a nuclear power station spent fuel pond integrated monitoring system which characterized in that includes:

the temperature/switching value liquid level acquisition assemblies are respectively arranged along different elevations of the spent fuel pool from top to bottom and are used for acquiring and transmitting temperature signals of a plurality of liquid levels of the pool and thermal diffusion type switching value liquid level signals in real time;

the analog quantity liquid level detector is arranged in parallel with the temperature/switching quantity liquid level acquisition assembly and is inserted into the pool body of the spent fuel pool to continuously detect the liquid level of the spent fuel pool;

and the processing transmitting unit is respectively connected with the temperature/switching value liquid level acquisition assembly and the analog quantity liquid level detector, is used for receiving the temperature signal, the thermal diffusion switching value liquid level signal and the liquid level signal of the analog quantity liquid level detector, judges whether the received temperature signal is an effective water temperature signal according to the received thermal diffusion switching value liquid level signal, and displays the height of the liquid level of the water pool and the water temperature.

2. The monitoring system according to claim 1, wherein the temperature/switching value liquid level acquisition assembly comprises a plurality of thermal resistance sensor assemblies respectively arranged at different elevation positions of the spent fuel pool, each thermal resistance sensor assembly comprises a first sensor and a second sensor which are arranged in pairs, the first sensor at the same elevation is used for acquiring a water temperature signal at the same elevation, the second sensor at the same elevation which is correspondingly arranged is used for acquiring a water temperature signal after heat diffusion of the water pool after heating, and the switching value liquid level signal at the elevation is calculated according to the water temperature signals acquired by the first sensor and the second sensor;

the analog quantity liquid level detector comprises a guided wave radar liquid level meter measuring and sensing unit, is arranged at the top of the water pool and is used for sending and receiving guided wave radar analog quantity liquid level signals under the control of the processing and transmitting unit;

the processing and transmitting unit is further used for receiving the temperature signals and the thermal diffusion type switching value liquid level signals, judging whether the received temperature signals are effective water temperature signals or not according to the received thermal diffusion type switching value liquid level signals, and calculating the liquid level height of the spent fuel pool according to the time difference of sending and receiving the guided wave radar analog quantity liquid level signals.

3. The monitoring system of claim 2, wherein the processing and transmitting unit includes a control module coupled to the first sensor, a switching value level processing module coupled to the first sensor and the second sensor, and an analog level processing module coupled to the analog level detector;

the switching value liquid level processing module is used for calculating and outputting a switching value liquid level signal to the control module according to the received thermal diffusion type switching value liquid level signal and based on a thermal diffusion principle;

the control module is used for judging whether the water level of the water tank contacts a liquid level switch of a second sensor which is correspondingly arranged, and if the water level switch of the second sensor is contacted, judging that a water temperature signal measured by the temperature sensor is an effective water temperature signal, and outputting a water temperature signal;

control module still is used for surveying the actual liquid level height in pond through analog quantity liquid level processing module control analog quantity liquid level detector, and analog quantity liquid level detector is based on the guided wave radar level gauge output analog quantity liquid level signal of time domain reflection principle extremely control module, through control module calculates and obtains the actual liquid level height in spentnuclear fuel pond.

4. The monitoring system of claim 3, further comprising a display alarm module connected to the control module; the control module is also used for comparing the received actually measured water temperature signal with a preset water temperature signal and outputting an alarm signal according to the comparison result; the display alarm module is used for receiving the alarm signal and outputting a temperature signal of the spent fuel pool.

5. The monitoring system of claim 3, wherein the processing and transmitting unit further comprises a power supply and power control module for controlling the power supply of the heating resistor of the second sensor and supplying power to the guided wave radar level detector, the control module, the switching value level processing module and the analog value level processing module; the control module, the switching value liquid level processing module, the analog value liquid level processing module and the power supply and power control module are all integrated in the processing transmitting unit.

6. The monitoring system according to claim 5, further comprising a first anti-seismic support and a second anti-seismic support, wherein the first anti-seismic support and the second anti-seismic support are fixedly connected to the upper spent fuel pool platform, the temperature/switching value liquid level acquisition assembly is fixed to the first anti-seismic support, the analog value liquid level detector is fixed to the second anti-seismic support, and a preset distance is formed between the analog value liquid level detector and the temperature/switching value liquid level acquisition assembly.

7. The monitoring system according to claim 6, wherein a first mounting plate is arranged on the first anti-seismic support, a protection pipe which extends along the bottom direction of the water tank is welded on the first mounting plate, the protection pipe is used for protecting the temperature/switching value liquid level acquisition assembly, the temperature/switching value liquid level acquisition assembly is of an armored structure of stainless steel pipes, and a first sensor and a second sensor which are arranged in pairs are arranged at positions corresponding to different water level heights in the armored stainless steel pipe body;

the device comprises a pipe body, a plurality of first sensors and a plurality of second sensors, a pair of double branch heating resistors and a controller, wherein the first sensors and the second sensors which are arranged in pairs along the cross section direction of the pipe body are symmetrically arranged along two sides of the center in the pipe body, and the center in the cross section direction of the pipe body is provided with a pair of double branch heating resistors for measuring the temperature of a medium at the lowest position in a spent fuel;

the second anti-seismic support is provided with a second mounting plate, the second mounting plate is provided with a guided wave rod extending along the bottom direction of the water tank, the guided wave radar level gauge measurement sensing unit comprises a radar wave transmitting and receiving device, the sensing unit is used for transmitting radar waves along the guided wave rod, and when the radar waves contact the liquid level to be reflected, the sensing unit is also used for receiving the reflected radar waves;

and a sliding groove type structure is adopted between each anti-seismic support and the corresponding mounting plate support.

8. The monitoring system of claim 7, wherein the analog level detector further comprises a high speed timing module and a signal processing and converting module, the high speed timing module calculates the time difference between the emission and the reflection of the radar wave, the high speed timing module and the signal processing and converting module and the radar wave emitting and receiving device are in a split structure, the high speed timing module and the signal processing and converting module are integrated in a processing and transmitting unit, and the radar wave emitting and receiving device is arranged on the second mounting plate.

9. The monitoring system of claim 2, wherein each paired first sensor of a different elevation setting is a platinum thermistor temperature sensor and the second sensor is a platinum thermistor temperature sensor having a heating resistor.

10. A comprehensive monitoring method for a spent fuel pool of a nuclear power plant, which adopts the monitoring system as claimed in any one of claims 1 to 9, and is characterized by comprising the following steps:

acquiring A-grade platinum thermal resistance temperature signals of different elevations of a spent fuel pool of a nuclear power station, acquiring another A-grade platinum thermal resistance temperature signal of a corresponding elevation point, and calculating to obtain a thermal diffusion type switching value liquid level signal based on a thermal diffusion principle;

sending out radar waves, receiving the returned radar waves, and detecting the liquid level of the spent fuel pool;

and judging whether the received temperature signal is an effective water temperature signal or not according to the received thermal diffusion type switching value liquid level signal, and displaying the height of the liquid level of the water pool and the water temperature.

11. The monitoring method according to claim 10, wherein a first sensor is used for collecting a water temperature signal with a standard height of the first sensor, a second sensor with the same standard height and arranged corresponding to the first sensor is used for collecting a temperature signal after being heated, and a thermal diffusion type switching value liquid level signal is calculated and output based on a thermal diffusion principle;

judging whether the water level of the water pool contacts a second sensor switching value liquid level sensor which is correspondingly arranged, if so, judging that a water temperature signal measured by a corresponding temperature sensor with a standard height is an effective water temperature signal, and outputting a water temperature signal; the analog quantity liquid level detector detects the actual liquid level height of the pool, the guided wave radar liquid level meter based on the time domain reflection principle outputs an analog quantity liquid level signal, and the actual liquid level height of the spent fuel pool is obtained through calculation.

Technical Field

The invention relates to the technical field of a spent fuel pool of a nuclear power station, in particular to a comprehensive monitoring system and method for the spent fuel pool of the nuclear power station.

Background

In a nuclear power plant, a spent fuel pool cooling and treatment system does not directly participate in the reactivity control of the core and spent fuel, but provides subcritical margin for fuel assemblies stored in the spent fuel pool, and the system must discharge decay heat of the fuel assemblies stored in the spent fuel pool and perform a radioactive containment function by ensuring a containment isolation function. Under the design benchmark accident, the complete loss of the spent fuel pool cooling system is not considered, the pool cannot be boiled, the evaporation loss is not obvious, only an SSE (safe shut-down earthquake) earthquake-resistant water replenishing source is needed, and the water source flow is within the envelope range of the over-design benchmark accident. Under the over-design benchmark accident, such as common mode accidents like strong shock, tsunami and the like, and the mechanical and electrical faults of the spent fuel pool cooling system, the spent fuel pool completely loses normal cooling, the decay heat of the spent fuel assembly causes the pool to be heated to boiling, if no effective water supplement is available, the water level of the spent fuel pool continuously drops until the spent fuel assembly is exposed, and finally the spent fuel assembly loses cooling to cause cladding failure, so that a large amount of radioactivity is released to the environment. In addition, in the event of accidental drainage of the spent fuel pool, the system must avoid direct exposure of the fuel assemblies stored in the fuel grids, which is also required during fuel lifting. Therefore, the accurate measurement of the temperature and the liquid level of the spent fuel pool is realized under various working conditions, so that the water level of the spent fuel pool is ensured to be above the shielding liquid level of the spent fuel and has no temperature hot spot, and the method has very important effect on ensuring the safety of the spent fuel pool.

Traditional nuclear power station spent fuel pool temperature measurement sets up alone with the level measurement, and wherein the level measurement mainly adopts one of following two kinds of modes: one method is to output a liquid level switch quantity and an analog quantity signal based on a thermal diffusion principle, but the analog quantity measuring method has poor precision and is greatly influenced by water temperature fluctuation; in addition, the guided wave radar is adopted to singly output an analog quantity signal, but an alarm signal of the guided wave radar needs to be converted from the analog quantity signal, so that the problem of large measurement error exists in the extreme environment of a spent fuel pool with a large amount of steam. The liquid level measurement adopts single guided wave radar measurement, and the common cause failure risk exists under the extreme environment condition; the temperature sensor can only measure the temperature of pool water at a single elevation, and cannot reflect local hot spots. The prior art is provided with a spent fuel pool state continuous monitoring system, which adopts a combination instrument of a continuous liquid level sensor based on a thermal diffusion principle, a liquid level switch and an RTD (thermal resistance temperature sensor), but the continuous liquid level sensor based on the thermal diffusion principle has poor measurement precision, and has larger measurement deviation particularly under the condition of larger water temperature difference between pool layers; the continuous liquid level sensor and the liquid level switch both adopt a thermal diffusion principle, have no diversified measurement means, and have a common cause failure risk under extreme environmental conditions. Therefore, in the prior art, the parameter measurement of the spent fuel pool has the technical problems of scattered acquisition, inconvenience in installation and replacement, single signal source in liquid level measurement and inaccurate measurement under certain working conditions.

Therefore, the prior art has the defects and needs to be improved.

Disclosure of Invention

The invention provides a comprehensive monitoring system and a method for a spent fuel pool of a nuclear power station, which can enable an operator to accurately know parameter conditions of the pool so as to take corresponding measures and ensure the safety of the spent fuel pool, aiming at the technical problems of scattered acquisition, inconvenient installation and replacement, single signal source of liquid level measurement and inaccurate measurement under certain working conditions of the parameter measurement of the spent fuel pool in the prior art.

The technical scheme provided by the invention for the technical problem is as follows:

a nuclear power station spent fuel pool integrated monitoring system includes: the temperature/switching value liquid level acquisition assemblies are respectively arranged from top to bottom along different elevations of the spent fuel pool and are used for acquiring and transmitting temperature signals of a plurality of liquid levels of the pool and thermal diffusion type switching value liquid level signals in real time; the analog quantity liquid level detector is arranged in parallel with the temperature/switching quantity liquid level acquisition assembly and is inserted into the pool body of the spent fuel pool to continuously detect the liquid level of the spent fuel pool; and the processing transmitting unit is respectively connected with the temperature/switching value liquid level acquisition assembly and the analog quantity liquid level detector, is used for receiving the temperature signal, the thermal diffusion switching value liquid level signal and the liquid level signal of the analog quantity liquid level detector, judges whether the received temperature signal is an effective water temperature signal according to the received thermal diffusion switching value liquid level signal, and displays the height of the liquid level of the water pool and the water temperature.

The temperature/switching value liquid level acquisition assembly comprises a plurality of thermal resistance sensor assemblies which are respectively arranged at different elevation positions of the spent fuel pool, each thermal resistance sensor assembly comprises a first sensor and a second sensor which are arranged in pairs, the first sensor at the same elevation is used for acquiring a water temperature signal at the same elevation, the second sensor at the same elevation, which is correspondingly arranged with the first sensor, is used for acquiring a water temperature signal after high heat diffusion of the corresponding pool after heating, and the switching value liquid level signal at the elevation is obtained by calculation according to the water temperature signals acquired by the first sensor and the second sensor; the analog quantity liquid level detector comprises a guided wave radar liquid level meter measuring and sensing unit, is arranged at the top of the water pool and is used for sending and receiving guided wave radar analog quantity liquid level signals under the control of the processing and transmitting unit; the processing and transmitting unit is further used for receiving the temperature signals and the thermal diffusion type switching value liquid level signals, judging whether the received temperature signals are effective water temperature signals or not according to the received thermal diffusion type switching value liquid level signals, and calculating the liquid level height of the spent fuel pool according to the time difference of sending and receiving the guided wave radar analog quantity liquid level signals.

The processing and transmitting unit comprises a control module connected with the first sensor, a switching value liquid level processing module connected with the first sensor and the second sensor, and an analog quantity liquid level processing module connected with the analog quantity liquid level detector; the switching value liquid level processing module is used for calculating and outputting a switching value liquid level signal to the control module according to the received thermal diffusion type switching value liquid level signal and based on a thermal diffusion principle; the control module is used for judging whether the water level of the water tank contacts a liquid level switch of a second sensor which is correspondingly arranged, judging that a water temperature signal measured by the temperature sensor is an effective water temperature signal if the water level of the water tank contacts the liquid level switch of the second sensor, and outputting the water temperature signal; control module still is used for surveying the actual liquid level height in pond through analog quantity liquid level processing module control analog quantity liquid level detector, and analog quantity liquid level detector is based on the guided wave radar level gauge output analog quantity liquid level signal of time domain reflection principle extremely control module, through control module calculates and obtains the actual liquid level height in spentnuclear fuel pond.

The device also comprises a display alarm module connected to the control module; the control module is also used for comparing the received actually measured water temperature signal with a preset water temperature signal and outputting an alarm signal according to the comparison result; the display alarm module is used for receiving the alarm signal and outputting a temperature signal of the spent fuel pool.

The processing and transmitting unit further comprises a power supply and power control module, a switching value liquid level processing module and an analog value liquid level processing module, wherein the power supply and power control module is used for controlling the power supply power of the heating resistor of the second sensor and supplying power to the guided wave radar liquid level detector; the control module, the switching value liquid level processing module, the analog value liquid level processing module and the power supply and power control module are all integrated in the processing transmitting unit.

The system comprises a spent fuel pool, a temperature/switching value liquid level acquisition assembly, an analog quantity liquid level detector, a temperature/switching value liquid level acquisition assembly, a first anti-seismic support and a second anti-seismic support, wherein the first anti-seismic support and the second anti-seismic support are fixedly connected to an upper platform of the spent fuel pool respectively, the temperature/switching value liquid level acquisition assembly is fixed to the first anti-seismic support, the analog quantity liquid level detector is fixed to the second anti-seismic support, and a preset distance is reserved between the analog quantity.

The first anti-seismic support is provided with a first mounting plate, the first mounting plate is welded with a protection tube extending along the direction of the bottom of the water pool, the protection tube is used for protecting a temperature/switching value liquid level acquisition assembly, the temperature/switching value liquid level acquisition assembly is of an armored structure of a stainless steel tube, and a first sensor and a second sensor which are arranged in pairs are arranged at positions corresponding to different water level heights in the armored stainless steel tube body; the device comprises a pipe body, a plurality of first sensors and a plurality of second sensors, a pair of double branch heating resistors and a controller, wherein the first sensors and the second sensors which are arranged in pairs along the cross section direction of the pipe body are symmetrically arranged along two sides of the center in the pipe body, and the center in the cross section direction of the pipe body is provided with a pair of double branch heating resistors for measuring the temperature of a medium at the lowest position in a spent fuel; the second is resisted and is shaken the support and is provided with the second mounting panel, have the guided wave pole that extends along pond bottom direction on the second mounting panel, guided wave radar level gauge measurement sensing unit includes radar wave transmission and receiving arrangement, and the sensing unit is used for sending the radar wave along the guided wave pole, and when the radar wave contact liquid level reflection, and the sensing unit still is used for receiving the radar wave of reflection back.

The analog quantity liquid level detector also comprises a high-speed timing module and a signal processing and converting module, wherein the high-speed timing module calculates the time difference between the emission and the reflection of the radar waves, the high-speed timing module, the signal processing and converting module and the radar wave emitting and receiving device are of a split structure, the high-speed timing module and the signal processing and converting module are integrated in a processing and transmitting unit, and the radar wave emitting and receiving device is arranged on the second mounting plate.

Wherein, each first sensor that sets up in pairs that different elevation set up is platinum resistance temperature sensor, the second sensor is platinum resistance temperature sensor who has heating resistor

The invention also provides a comprehensive monitoring method for the spent fuel pool of the nuclear power station, which comprises the following steps: acquiring A-grade platinum thermal resistance temperature signals of different elevations of a spent fuel pool of a nuclear power station, acquiring another A-grade platinum thermal resistance temperature signal of a corresponding elevation point, and calculating to obtain a thermal diffusion type switching value liquid level signal based on a thermal diffusion principle; sending out radar waves, receiving the returned radar waves, and detecting the liquid level of the spent fuel pool; and judging whether the received temperature signal is an effective water temperature signal or not according to the received thermal diffusion type switching value liquid level signal, and displaying the height of the liquid level of the water pool and the water temperature.

The method comprises the following steps that a first sensor is used for collecting a water temperature signal with the height of the first sensor, a second sensor with the same height, which is correspondingly arranged with the first sensor, is used for collecting a temperature signal after being heated, and a thermal diffusion type switching value liquid level signal is calculated and output based on a thermal diffusion principle; judging whether the water level of the water pool contacts a second sensor switching value liquid level sensor which is correspondingly arranged, if so, judging that a water temperature signal measured by a corresponding temperature sensor with a standard height is an effective water temperature signal, and outputting a water temperature signal; the analog quantity liquid level detector detects the actual liquid level height of the pool, the guided wave radar liquid level meter based on the time domain reflection principle outputs an analog quantity liquid level signal, and the actual liquid level height of the spent fuel pool is obtained through calculation.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

the liquid level measurement of the spent fuel pool adopts a thermal diffusion type and guided wave radar diversified measurement technology, so that the liquid level of the spent fuel pool can be accurately obtained under various working conditions, and the safety of the spent fuel pool is ensured; the temperature measurement and the thermal diffusion type liquid level measurement are integrated into an armored assembly, so that the installation and maintenance are more convenient, and the reliability is higher; the non-heating element of the thermal diffusion type liquid level measurement can measure the water temperatures of different elevations at the same time, and can detect whether hot spots exist at different elevations of the water pool or not; the processing and transmitting unit simultaneously receives the temperature signal, the thermal diffusion type switching value liquid level signal and the liquid level signal of the analog quantity liquid level detector, and judges whether the received temperature signal is an effective water temperature signal or not according to the received thermal diffusion type switching value liquid level signal; when the liquid level of the spent fuel pool is continuously detected or the effective water temperature signal exceeds the set temperature value according to judgment, the analog quantity liquid level detector is controlled to measure the liquid level height of the spent fuel pool, and the analog quantity liquid level detector is started to detect by means of judging firstly and then controlling the analog quantity liquid level detector, so that the energy can be saved, the analog quantity liquid level detector only detects when needed, and the service life of the liquid level detector is prolonged. The anti-seismic support is further adopted, the mounting plate adopts a sliding groove type mounting mode, the mounting is convenient and reliable, and foreign matters are prevented from entering the spent fuel pool in the mounting and replacing processes.

Drawings

Fig. 1 is a schematic diagram of a control system of a nuclear power plant spent fuel pool comprehensive monitoring system according to an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of a comprehensive monitoring system for a spent fuel pool according to an embodiment of the present invention.

Fig. 3A is a schematic structural diagram of a first anti-seismic support according to a second embodiment of the present invention.

Fig. 3B is a schematic structural diagram of the top view of fig. 3A.

Fig. 4 is a schematic structural diagram of a first mounting plate according to a second embodiment of the present invention.

Fig. 5 is a schematic diagram of a distribution structure of temperature sensors arranged in pairs at different elevations inside a protection tube according to a second embodiment of the present invention.

Fig. 6 is a schematic flow chart of a comprehensive monitoring method for a spent fuel pool of a nuclear power plant according to a third embodiment of the present invention.

Fig. 7 is another schematic flow chart of a comprehensive monitoring method for a spent fuel pool of a nuclear power plant according to a third embodiment of the present invention.

Fig. 8 is a schematic flow chart of a further method for comprehensively monitoring a spent fuel pool of a nuclear power plant according to a third embodiment of the present invention.

Detailed Description

In order to solve the technical problems of scattered acquisition, inconvenient installation and replacement of parameter measurement of a spent fuel pool of a nuclear power station, single signal source of liquid level measurement and inaccurate measurement under certain working conditions in the prior art, the invention aims to provide a comprehensive monitoring system and a method of the spent fuel pool of the nuclear power station, and the core idea of the comprehensive monitoring system is as follows: utilize this monitoring system to realize the comprehensive monitoring to nuclear power station spent fuel pond, it includes: collecting temperature and liquid level measurement signals of different elevations of the spent fuel pool, outputting the temperature of the spent fuel pool, and outputting an alarm signal based on a comparison result; calculating and outputting a switching value liquid level signal based on a thermal diffusion principle; processing a guided wave radar liquid level meter output analog quantity liquid level signal based on a time domain reflection principle; and controlling the power supply of the heating resistor of the thermal diffusion type liquid level meter and supplying power to the guided wave radar liquid level detector and the processing and transmitting unit. The invention obtains the liquid level parameter of the spent fuel pool by applying the mature platinum thermal resistance temperature measurement technology, the thermal diffusion type liquid level measurement technology and the guided wave radar liquid level measurement technology to the temperature and liquid level measurement of the spent fuel pool of the nuclear power station and adopting diversified measurement means of the thermal diffusion type liquid level measurement and the guided wave radar liquid level measurement, solves the technical problems that the liquid level measurement has single signal source and inaccurate measurement under certain working conditions, and simultaneously integrates the acquired information together to realize integrated installation and signal acquisition, so that an operator can accurately and quickly obtain a plurality of parameters such as the temperature/liquid level of the spent fuel pool in various working conditions, a control system or the operator can take corresponding measures, and the safety of the spent fuel pool is ensured.

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.