Online analysis system and method for conductivity in primary loop coolant

Abstract

The invention belongs to the technical field of power station on-line water quality monitoring, and discloses an on-line analysis system and method for conductivity in a primary loop coolant. The system comprises a flow cell, a sample introduction pipeline, a water drainage pipeline and a bypass sampling pipeline; a first-stage heat exchanger, a pressure reducing valve, a second-stage heat exchanger, a pressure regulating valve and a sample injection switch valve are sequentially arranged on the sample injection pipeline, the bypass sampling pipeline is connected to a pipeline between the pressure regulating valve and the sample injection switch valve, a bypass sampling switch valve and a quick connector are arranged on the bypass sampling pipeline, and the drainage pipeline is connected with the flow cell. A conductivity sensor is arranged on the flow cell, and the conductivity analyzer is connected with the conductivity sensor; the method comprises the steps of equipment calibration, online measurement and chemical comparison. The measurement precision and stability can meet the measurement requirements of the primary loop coolant of the nuclear power plant, and real-time monitoring of the online conductivity value of the primary loop coolant of the nuclear power plant is ensured.

Description

Technical Field

[0001] This application belongs to the technical field of on-line water quality monitoring in power plants, and particularly relates to an on-line conductivity analysis system and method for primary coolant. Background Art

[0002] With the continuous growth of global energy demand and the increasing awareness of environmental protection, nuclear energy, as a clean and efficient energy form, has occupied an increasingly important position in the energy structure. However, during the operation of nuclear power plants, the performance of the primary coolant has a crucial impact on the safe and stable operation of the reactor. The main functions of the primary coolant are to remove the heat generated in the reactor and transfer it to the secondary circuit, and at the same time, it is necessary to cool and protect the reactor core.

[0003] During the operation of the primary coolant in a nuclear power plant, conductivity is a key physical parameter. The magnitude of conductivity not only reflects the content and type of impurities in the coolant, but also may be related to key indicators such as the radiation performance, heat conduction performance, and corrosiveness of the coolant. At the same time, operations such as adding ammonia, potassium, and lithium can be adjusted by monitoring the change of conductivity to control the water chemistry conditions in real time. Therefore, real-time and accurate on-line monitoring and analysis of the conductivity in the primary coolant are of extremely important significance for ensuring the safe and stable operation of nuclear power plants.

[0004] Traditional conductivity monitoring methods mainly rely on off-line sampling analysis. This method has disadvantages such as poor sampling representativeness, long analysis cycle, and data lag. At the same time, the primary coolant sample water is radioactive, and laboratory analysis methods are prone to cause radioactive contamination to sampling personnel and equipment. It is difficult to meet the high requirements for safe and stable operation of modern nuclear power plants. In recent years, with the rapid development of sensor technology, computer technology, and data analysis technology, on-line, real-time, and continuous conductivity monitoring and analysis can be realized.

[0005] Nuclear power plants have very high requirements for on-line conductivity measurement systems, which should have anti-radiation and anti-interference capabilities, and at the same time have high measurement accuracy and good stability. However, there is currently no on-line conductivity analysis system dedicated to the water quality supervision and control of the primary circuit in nuclear power plants. Summary of the Invention

[0006] The purpose of this application is to overcome the defects of the prior art and provide an on-line conductivity analysis system and method for primary coolant, so as to realize the real-time measurement of the conductivity value of the primary coolant in a nuclear power plant and timely and accurately reflect the water chemistry operating conditions of the primary coolant.

[0007] To achieve the above purpose, this application provides the following technical solutions:

[0008] In a first aspect, the present application provides an on-line conductivity analysis system for primary coolant, comprising a flow cell, a sampling pipeline, a drainage pipeline, and a bypass sampling pipeline; the sampling pipeline is connected to the flow cell, and a primary heat exchanger, a pressure reducing valve, a secondary heat exchanger, a pressure regulating valve, and a sampling on-off valve are successively arranged on the sampling pipeline. The bypass sampling pipeline is connected to the pipeline between the pressure regulating valve and the sampling on-off valve, and a bypass sampling on-off valve and a quick connector are arranged on the bypass sampling pipeline; the drainage pipeline is connected to the flow cell, a conductivity sensor is arranged on the flow cell, and a conductivity analyzer is connected to the conductivity sensor.

[0009] In some embodiments, the conductivity analyzer is connected to the conductivity sensor through an electrode cable.

[0010] In some embodiments, a power supply module, a signal processing module, and a standard signal output module which are electrically connected are arranged inside the conductivity analyzer, and a display screen, an alarm lamp, a key, and an output interface are arranged outside.

[0011] In some embodiments, an outlet on-off valve is arranged on the drainage pipeline.

[0012] In some embodiments, the quick connector is connected to the conductance cell of a standard conductivity meter, and the drainage pipeline is connected to a drainage system.

[0013] In a second aspect, the present application provides an on-line conductivity analysis method for primary coolant, using the on-line conductivity analysis system for primary coolant, comprising:

[0014] Step 1: Calibrate the conductivity analyzer with a potassium chloride standard solution. After disassembling the conductivity sensor, rinse, dry, and soak it for calibration. When the error exceeds a first set value, adjust the electrode constant;

[0015] Step 2: Adjust the secondary heat exchanger to a set temperature, adjust the pressure regulating valve to a set pressure, introduce the sample water into the flow cell, and turn on the linear temperature compensation to measure and transmit data in real time;

[0016] Step 3: The standard conductivity meter is connected in parallel through the quick connector for detection. After rinsing, compare the indicated values. When the error exceeds a second set value, recalibrate.

[0017] In some embodiments, Step 1 includes:

[0018] Prepare a 0.001 mol / L potassium chloride standard solution;

[0019] Set the temperature compensation function of the conductivity analyzer to automatically compensate the conductivity value to 25 °C;

[0020] Remove the conductivity sensor from the flow cell, rinse the conductivity sensor with demineralized water to remove the residual sample water on the surface of the conductivity sensor and dry it.

[0021] Place the conductivity sensor in a 0.001mol / L potassium chloride standard solution, compare the indication error between the conductivity analyzer and the standard solution. If the absolute value of the conductivity difference between the two exceeds 0.5 us / cm, calibrate the electrode constant of the conductivity analyzer.

[0022] In some embodiments, in step 2, adjust the temperature of the primary loop sample water to below 30°C through the secondary heat exchanger, adjust the sample water pressure through the pressure regulating valve, adjust the injection flow rate of the conductivity meter through the injection switch valve, open the outlet switch valve, the sample water enters the flow cell and is discharged through the drainage pipeline. The temperature compensation function of the conductivity analyzer is set to linear compensation, and the online real-time measurement and transmission of the conductivity value are completed through the conductivity analyzer.

[0023] In some embodiments, step 2 includes:

[0024] Cool the temperature of the primary loop sample water to below 60°C through the primary heat exchanger;

[0025] Reduce the pressure to 2 - 3 MPa through the pressure reducing valve;

[0026] Cool the temperature of the primary loop sample water to below 30°C through the secondary heat exchanger;

[0027] Reduce the sample water pressure to below 0.5 MPa through the pressure regulating valve;

[0028] Adjust the injection flow rate of the online conductivity analyzer through the injection switch valve. The primary loop coolant flows in from the bottom of the flow cell and out from the side of the flow cell. The outlet switch valve remains fully open during measurement;

[0029] The conductivity sensor measures the resistance value of the primary loop sample water in the flow cell, transmits the resistance signal to the conductivity analyzer through the electrode cable, converts it into a conductivity value for display through the signal processing module, and the standard signal output module converts the conductivity value into a standard signal and sends it to the main control room OM screen for monitoring.

[0030] In some embodiments, in step 3, directly connect the conductance cell of the standard conductivity meter to the quick connector, open the bypass sampling switch valve, rinse, compare the measurement indication values between the conductivity analyzer and the standard conductivity meter. If the absolute value of the conductivity difference between the two is within 0.2 us / cm, the conductivity analyzer is not calibrated. If the absolute value of the conductivity difference between the two exceeds 0.2 us / cm, calibrate the conductivity analyzer.

[0031] Compared with the prior art, the on-line conductivity analysis system and method for primary coolant provided by this application have the following beneficial effects:

[0032] The measurement accuracy and stability of this application can meet the measurement requirements of the primary coolant in nuclear power plants, ensuring real-time monitoring of the on-line conductivity value of the primary coolant in nuclear power plants.

[0033] This application sends the primary coolant of the primary loop system to the on-line conductivity sensor for real-time measurement after cooling and reducing the pressure through a heat exchanger and a pressure reducing valve, overcoming the disadvantages of low monitoring frequency and large sampling error in the existing laboratory instrument analysis and detection methods, timely reflecting the water quality of the primary coolant, and ensuring the safe and stable operation of the primary loop system of the nuclear power unit.

[0034] This application changes the existing manual sampling analysis into automatic on-line continuous analysis and detection, effectively reducing the sampling frequency of the sampling personnel for the primary coolant and reducing the radiation dose of the sampling personnel exposed to radioactive water samples.

[0035] Furthermore, this application adopts the water sample flow inspection method, which has good stability and high accuracy. At the same time, the standard conductivity meter adopts a quick plug connection method, realizing quick connection, simple operation, and improving the work efficiency of the staff.

[0036] Furthermore, this application can be improved to meet the use of other water vapor systems and other on-line instruments, such as pH meters, dissolved oxygen meters, etc., and has good popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of this application, the following will briefly introduce the drawings required for the technical description.

[0038] Figure 1 It is a schematic structural diagram of the on-line conductivity analysis system for primary coolant provided by the embodiment of this application;

[0039] Figure 2 It is a schematic internal structure diagram of the on-line conductivity analyzer for primary coolant provided by the embodiment of this application;

[0040] Figure 3 It is a flowchart of the on-line conductivity analysis method for primary coolant provided by the embodiment of this application.

[0041] Description of the reference numerals:

[0042] 1. Primary heat exchanger; 2. Pressure reducing valve; 3. Secondary heat exchanger; 4. Pressure regulating valve; 5. Sampling pipeline; 6. Sampling switch valve; 7. Flow cell; 8. Conductivity sensor; 9. Drainage pipeline; 10. Outlet water switch valve; 11. Electrode cable; 12. Conductivity analyzer; 13. Alarm lamp; 14. Button; 15. Output interface; 16. Bypass sampling switch valve; 17. Quick connector; 18. Bypass sampling pipeline; 19. Power module; 20. Signal processing module; 21. Standard signal output module. Detailed implementation manners

[0043] The following is a further detailed description through specific implementation manners.

[0044] As Figure 1 shown, the embodiment of the present application provides an on-line conductivity analysis system for primary coolant, including a primary heat exchanger 1, a pressure reducing valve 2, a secondary heat exchanger 3, a pressure regulating valve 4, a sampling pipeline 5, a sampling switch valve 6, a flow cell 7, a conductivity sensor 8, a drainage pipeline 9, an outlet water switch valve 10, an electrode cable 11, a conductivity analyzer 12, a bypass sampling switch valve 16, and a quick connector 17.

[0045] The sampling pipeline 5 is communicated with the flow cell 7. The primary heat exchanger 1, the pressure reducing valve 2, the secondary heat exchanger 3, the pressure regulating valve 4, and the sampling switch valve 6 are sequentially arranged on the sampling pipeline 5. The sampling switch valve 6 is arranged on the pipeline close to the flow cell 7, that is, the sampling switch valve 6 is arranged at the downstream position of the sampling pipeline 5, and the primary heat exchanger 1 is arranged at the upstream position of the sampling pipeline 5.

[0046] A bypass sampling pipeline 18 is externally connected to the sampling pipeline 5 between the pressure regulating valve 4 and the sampling switch valve 6. A bypass sampling switch valve 16 and a quick connector 17 are arranged on the bypass sampling pipeline 18. The quick connector 17 is connected to the conductance cell of a standard conductivity meter. The quick connector 17 can be directly connected to the conductance cell of the standard conductivity meter. Slowly open the bypass sampling switch valve 16 and flush the flow path for more than 5 minutes for on-line comparison with the on-line conductivity analyzer 12.

[0047] The sampling pipeline 5 leads the high-temperature and high-pressure primary coolant sample water to the primary heat exchanger 1 first. The primary heat exchanger 1 cools the sample water temperature to about 60 °C, and then the pressure is reduced to 2 - 3 MPa through the pressure reducing valve 2. The pressure reducing valve 2 can roughly adjust the sampling flow rate and pressure.

[0048] The secondary heat exchanger 3 further adjusts the temperature of the primary coolant sample water, adjusts the temperature of the primary coolant sample water to about 30 °C, and then reduces the sample water pressure to about 0.5 MPa through the pressure regulating valve 4. When the sample water pressure is greater than 0.8 MPa, the pressure regulating valve 4 is interlocked and closed to protect the downstream instruments. The two-stage temperature reduction and pressure reduction measures make the temperature and pressure control more precise.

[0049] The sampling switch valve 6 precisely adjusts the sampling flow rate of the conductivity meter. The sample water enters the flow cell 7 and then is discharged through the drain pipeline 9. The outlet switch valve 10 is fully open to ensure the normal discharge of the primary loop sample water into the drainage system.

[0050] One end of the drain pipeline 9 is connected to the flow cell 7, and the other end is connected to the drainage system. The outlet switch valve 10 is arranged on the drain pipeline 9 to control the normal discharge of the primary loop sample water into the drainage system.

[0051] The conductivity sensor 8 is inserted and arranged in the flow cell 7. One end of the electrode cable 11 is connected to the conductivity sensor 8, and the other end is connected to the conductivity analyzer 12. The conductivity sensor 8 measures the resistance of the primary loop sample water and transmits the resistance signal to the conductivity analyzer 12 through the electrode cable 11.

[0052] The conductivity analyzer 12 receives the resistance signal from the conductivity sensor 8, processes and converts it into a conductivity value through the signal processing module 20 for display, and converts it into a standard signal through the standard signal output module 21, and then sends it to the main control OM screen for monitoring through the output interface 15.

[0053] Such as Figure 1 and Figure 2 As shown, outside the conductivity analyzer 12, there are a display screen, an alarm lamp 13, a button 14, and an output interface 15. Inside the conductivity analyzer 12, there are a power module 19, a signal processing module 20, and a standard signal output module 21 that are electrically connected. The power module 19 supplies power to the signal processing module 20 and the standard signal output module 21 respectively.

[0054] Optionally, the daily verification of the conductivity analyzer 12 adopts the method of comparing with a standard meter, that is, the water sample flow inspection method. The conductance cell of the standard conductivity meter is directly connected to the quick-connect joint 17, and the bypass sampling switch valve 16 is slowly opened to ensure that the sample water meets the measurement requirements of both the conductivity analyzer 12 and the standard conductivity meter at the same time. The flow path is flushed for more than 5 minutes, and the measured values of the conductivity analyzer 12 and the standard conductivity meter are compared. If the absolute value of the conductivity difference between the two is within 0.2 us / cm, the measurement of the conductivity analyzer 12 is accurate and no calibration is required. If the absolute value of the conductivity difference between the two exceeds 0.2 us / cm, the conductivity analyzer 12 is calibrated to complete the daily quality control of the conductivity analyzer 12.

[0055] Optionally, the conductivity analyzer 12 is calibrated using the standard solution method. During the power operation, the conductivity value of the primary loop is between 40 and 60 us / cm. A 0.001 mol / L potassium chloride standard solution needs to be prepared, and the corresponding conductivity value at 25°C is 146.6 us / cm. Set the temperature compensation function of the conductivity analyzer 12 to automatically compensate the conductivity value to 25°C. Unscrew the conductivity sensor 8 counterclockwise from the flow cell 7, rinse the conductivity sensor 8 with demineralized water, remove the residual sample water on the surface of the conductivity sensor 8 and dry it. Then place the conductivity sensor 8 into the prepared 0.001 mol / L potassium chloride standard solution for calibration. After calibration, the relative error of the measured value of the 0.001 mol / L potassium chloride standard solution is within ±2% to meet the quality management goal, and the measurement accuracy of the conductivity analyzer 12 is reliable.

[0056] Optionally, an alarm lamp 13 and a key 14 are provided on the front panel of the conductivity analyzer 12, and an output interface 15 is provided on the outer side wall.

[0057] Optionally, the pressure reducing valve 2 is a manual pressure reducing valve.

[0058] Optionally, the pressure regulating valve 4 is a manual pressure regulating valve or an electric regulating valve.

[0059] Optionally, the output interface 15 is an RS485 / 4 - 20 mA output interface.

[0060] Optionally, the standard signal output module 21 is an RS485 / 4 - 20 mA output module.

[0061] In addition, as Figure 3 shown, based on the on-line conductivity analysis system for the primary coolant in the above embodiments, the embodiment of the present application provides an on-line conductivity analysis method for the primary coolant, including the following steps:

[0062] Step 1, equipment calibration. Calibrate the conductivity analyzer 12 with a potassium chloride standard solution. Disassemble the conductivity sensor 8, rinse and dry it, then soak it for calibration. When the error exceeds the first set value, adjust the electrode constant.

[0063] The conductivity analyzer 12 is calibrated using the standard solution method. Prepare a 0.001 mol / L potassium chloride standard solution, set the temperature compensation function of the conductivity analyzer 12, and automatically compensate the conductivity value to 25 °C. Unscrew the conductivity sensor 8 counterclockwise from the flow cell 7, rinse the conductivity sensor 8 with demineralized water, remove the residual sample water on the surface of the conductivity sensor 8 and dry it. Then place the conductivity sensor 8 into the prepared 0.001 mol / L potassium chloride standard solution, compare the indication error between the conductivity analyzer 12 and the standard solution. If the absolute value of the conductivity difference between the two exceeds 0.5 us / cm, calibrate the electrode constant of the conductivity analyzer 12 to ensure the accuracy of the measurement by the conductivity analyzer 12.

[0064] Step 2: On-line measurement. Adjust the secondary heat exchanger 3 to the set temperature and the pressure regulating valve 4 to the set pressure. Then, the sample water is introduced into the flow cell 7, and the linear temperature compensation is enabled to measure and transmit data in real time.

[0065] The secondary heat exchanger 3 adjusts the temperature of the primary loop sample water to about 30 °C, and the pressure regulating valve 4 adjusts the sample water pressure to about 0.5 MPa. The injection switch valve 6 precisely adjusts the injection flow rate of the conductivity meter, the outlet switch valve 10 is fully open, the sample water enters the flow cell 7, and then is discharged through the drainage pipeline 9. The temperature compensation function of the conductivity analyzer 12 is set to linear compensation, and the conductivity analyzer 12 completes the on-line real-time measurement and transmission of the conductivity value.

[0066] Step 3: Chemical comparison. The standard conductivity meter is connected in parallel for detection through the quick connector 17, and the indication values are compared after rinsing. When the error exceeds the second set value, recalibration is performed.

[0067] The comparison of the conductivity analyzer 12 adopts the water sample flow inspection method. During the comparison, directly connect the conductance cell of the standard conductivity meter to the quick connector 17, slowly open the bypass sampling switch valve 16 to ensure that the sample water meets the measurement requirements of both the conductivity analyzer 12 and the standard conductivity meter, rinse the flow path for more than 5 minutes, and compare the measurement indication values of the conductivity analyzer 12 and the standard conductivity meter. If the absolute value of the conductivity difference between the two is within 0.2 us / cm, the measurement of the conductivity analyzer 12 is accurate and no calibration is required. If the absolute value of the conductivity difference between the two exceeds 0.2 us / cm, calibrate the conductivity analyzer 12 to complete the daily quality tracking of the conductivity analyzer 12.

[0068] In one embodiment, when the unit is operating at normal power, the temperature of the primary coolant is 290 - 330 °C and the pressure is 14.7 - 15.7 MPa. To ensure the normal measurement of the conductivity sensor, a method of two-stage cooling and two-stage pressure reduction is adopted. The primary heat exchanger 1 cools the primary loop sample water temperature to about 60 °C, and then the pressure is reduced to 2 - 3 MPa through the pressure reducing valve 2. The secondary heat exchanger 3 cools the primary loop sample water temperature to about 30 °C, and then the sample water pressure is reduced to about 0.5 MPa through the pressure regulating valve 4. The sampling switch valve 6 regulates the sampling flow rate of the on-line conductivity analyzer. The primary coolant flows into the conductivity flow cell 7 from the bottom and out from the side of the flow cell 7. When measuring, the outlet switch valve 10 remains fully open to prevent the flow cell from being pressurized. The conductivity sensor 8 measures the resistance value of the primary loop sample water in the flow cell, and the electrode cable 11 transmits the resistance signal of the conductivity sensor 8 to the conductivity analyzer 12. The conductivity analyzer 12 receives the resistance signal of the conductivity sensor 8, processes and converts it into a conductivity value for display through the signal processing module 20. The standard signal output module 21 can convert the conductivity value into a standard signal and send it to the OM screen in the main control room for monitoring.

[0069] The measurement accuracy and stability of this application can meet the measurement requirements of the primary coolant in nuclear power plants, ensuring the real-time monitoring of the on-line conductivity value of the primary coolant in nuclear power plants.

[0070] The above are only the specific embodiments of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered within the protection scope of this application.

Claims

1. An on-line conductivity analysis system for primary coolant, characterized in that, It includes a flow cell (7), a sample injection pipeline (5), a drainage pipeline (9), and a bypass sampling pipeline (18); the sample injection pipeline (5) is connected to the flow cell (7), and a primary heat exchanger (1), a pressure reducing valve (2), a secondary heat exchanger (3), a pressure regulating valve (4), and a sample injection switch valve (6) are successively arranged on the sample injection pipeline (5). The bypass sampling pipeline (18) is connected to the pipeline between the pressure regulating valve (4) and the sample injection switch valve (6), and a bypass sampling switch valve (16) and a quick connector (17) are arranged on the bypass sampling pipeline (18); the drainage pipeline (9) is connected to the flow cell (7), a conductivity sensor (8) is inserted into the flow cell (7), and a conductivity analyzer (12) is connected to the conductivity sensor (8).

2. The on-line conductivity analysis system for the primary coolant according to claim 1, wherein The conductivity analyzer (12) is connected to the conductivity sensor (8) through an electrode cable (11).

3. The on-line conductivity analysis system for the primary coolant according to claim 1, characterized in that Inside the conductivity analyzer (12), there are a power supply module (19), a signal processing module (20), and a standard signal output module (21) which are electrically connected. Outside, there are a display screen, an alarm lamp (13), a key (14), and an output interface (15).

4. The online conductivity analysis system for the primary coolant according to claim 1, characterized in that An outlet switch valve (10) is arranged on the drainage pipeline (9).

5. The on-line conductivity analysis system for the primary coolant according to claim 1, wherein The quick connector (17) is connected to the conductivity cell of a standard conductivity meter, and the drainage pipeline (9) is connected to a drainage system.

6. An on-line analysis method for the conductivity in the primary coolant, characterized in that, Using the on-line conductivity analysis system for the primary coolant, it includes: Step 1: Calibrate the conductivity analyzer (12) with a potassium chloride standard solution. After disassembling the conductivity sensor (8), rinse, dry it, and then soak it for calibration. When the error exceeds the first set value, adjust the electrode constant; Step 2: Adjust the secondary heat exchanger (3) to the set temperature, adjust the pressure regulating valve (4) to the set pressure, introduce the sample water into the flow cell (7), and turn on the linear temperature compensation to measure and transmit data in real time; Step 3: The standard conductivity meter is connected in parallel for detection through the quick connector (17). After rinsing, compare the indication values. When the error exceeds the second set value, recalibrate.

7. The online analysis method for conductivity in the primary coolant according to claim 1, characterized in that, Step 1 includes: Prepare a 0.001mol / L potassium chloride standard solution; Set the temperature compensation function of the conductivity analyzer (12) to automatically compensate the conductivity value to 25°C; Disassemble the conductivity sensor (8) from the flow cell (7), rinse the conductivity sensor (8) with demineralized water, remove the residual sample water on the surface of the conductivity sensor (8), and dry it; Put the conductivity sensor (8) into the 0.001mol / L potassium chloride standard solution, compare the indication error between the conductivity analyzer (12) and the standard solution. If the absolute value of the conductivity difference between the two exceeds 0.5 us / cm, calibrate the electrode constant of the conductivity analyzer (12).

8. The on-line analysis method for the conductivity in the primary coolant according to claim 1, characterized in that In Step 2, the temperature of the primary loop sample water is adjusted to below 30°C through the secondary heat exchanger (3), the sample water pressure is adjusted through the pressure regulating valve (4), the sample injection flow rate of the conductivity meter is adjusted through the sample injection switch valve (6), the outlet water switch valve (10) is opened, the sample water enters the flow cell (7), and is discharged through the drain pipeline (9). The temperature compensation function of the conductivity analyzer (12) is set to linear compensation, and the on-line real-time measurement and transmission of the conductivity value are completed through the conductivity analyzer (12).

9. The on-line analysis method for conductivity in the primary coolant according to claim 1, characterized in that, Step 2 includes: Cooling the temperature of the primary loop sample water to below 60°C through the primary heat exchanger (1); Reducing the pressure to 2 - 3 MPa through the pressure reducing valve (2); Cooling the temperature of the primary loop sample water to below 30°C through the secondary heat exchanger (3); Reducing the sample water pressure to below 0.5 MPa through the pressure regulating valve (4); Adjusting the sample injection flow rate of the on-line conductivity analyzer through the sample injection switch valve (6). The primary loop coolant flows in from the bottom of the flow cell (7) and out from the side of the flow cell (7). The outlet water switch valve (10) remains fully open during measurement; The conductivity sensor (8) measures the resistance value of the primary loop sample water in the flow cell, transmits the resistance signal to the conductivity analyzer (12) through the electrode cable (11), is converted into a conductivity value for display by the signal processing module (20), and the standard signal output module (21) converts the conductivity value into a standard signal and sends it to the main control room OM screen for monitoring.

10. The on-line analysis method for conductivity in the primary coolant according to claim 1, characterized in that, In Step 3, directly connect the conductance cell of the standard conductivity meter to the quick connector (17), open the bypass sampling switch valve (16) for flushing, compare the measured indication values of the conductivity analyzer (12) and the standard conductivity meter. If the absolute value of the conductivity difference between the two is within 0.2 μS / cm, the conductivity analyzer (12) is not calibrated. If the absolute value of the conductivity difference between the two exceeds 0.2 μS / cm, the conductivity analyzer (12) is calibrated.

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