Boron meter calibration test device

Abstract

The utility model discloses a boron meter calibration test device, and relates to the technical field of nuclear power. A boron meter calibration test device comprises a calibration assembly used for loading demineralized water or a boron solution with a target concentration; the upper pipeline is in butt joint with one end of the calibration assembly and is detachably connected with the boron meter; one end of the detection assembly is in butt joint with the upper pipeline and used for providing a detection space; the secondary measurement assembly is connected with the detection assembly and is used for recording the neutron counting rate; the two ends of the lower pipeline are in butt joint with the detection assembly and the calibration assembly respectively, and the calibration assembly, the upper pipeline, the detection assembly and the lower pipeline form a closed loop and are detachably connected with the boron meter; and the circulating pump is mounted on the lower pipeline and is used for driving liquid in the lower pipeline to circularly flow. According to the utility model, the problems of complex boron meter calibration operation, high safety risk, long consumed time and long neutral period of boron solution online monitoring are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of nuclear power, in particular to a boron meter calibration test device. Background Art

[0002] Domestic pressurized water reactor nuclear power plants widely use boron meters to monitor the concentration of boron solution in the primary circuit in real time online. Calibration tests are an important factor affecting whether the boron meter can monitor and operate normally. The boron meter should be calibrated through calibration tests before loading the reactor, during overhaul, and after repairing and replacing parts of the boron meter (which affects the neutron counting rate).

[0003] The current common calibration process for boron meters utilizes a multi-point calibration and segmented fitting method, requiring manual work and posing a significant risk of contamination to operators. Calibration often requires multiple test points. For example, the paper "Testing and Calibration Technology of Boron Meters in Nuclear Power Plants," published in the 6th issue of Nuclear Electronics and Detection Technology in 2012, describes 10 boron meter calibration test points; another paper, "Measurement and Calibration of Boron Meters," published in the 6th issue of Modern Corporate Culture in 2015, describes 11 boron meter calibration test points. In practice, each calibration test point undergoes a series of steps, including a calibration loop, neutron count rate acquisition, and sample chemical titration analysis. Acquiring test data for each calibration point takes approximately one hour. Therefore, under the premise that the calibration test is carried out smoothly and uninterruptedly, it takes more than 10 hours to complete the calibration test of the boron meter. If the calibration result is not ideal, the calibration test needs to be repeated. Especially during a fuel cycle of a nuclear power plant, the recalibration of the boron meter after replacing the faulty parts brings considerable work pressure to the relevant operating personnel of the nuclear power plant. During this period, there is a risk of not being able to detect the accidental dilution of the first-loop boron solution in time, which affects the safe operation of the reactor to a certain extent.

[0004] Based on the above, the disadvantages of the current calibration test of boron meters can be summarized as follows: ① The operation is complex, the work efficiency is low, and there is a risk of pollution; ② The calibration test takes too long, which is time-consuming and labor-intensive for operation and maintenance personnel; ③ The calibration test may cause a gap in the real-time online monitoring of the concentration of the first-loop boron solution, affecting the safe operation of the reactor.

[0005] Therefore, it is necessary and meaningful to provide a test device that can quickly calibrate the boron meter. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a boron meter calibration test device to solve the problems of complex boron meter calibration operation, high safety risk, long time consumption and long idle period for online monitoring of boron solution.

[0007] The utility model is achieved through the following technical solutions:

[0008] A boron meter calibration test device, comprising

[0009] Calibration assembly, used to fill with deionized water or boron solution of target concentration;

[0010] The upper pipeline is connected to one end of the calibration component and is detachably connected to the boron meter;

[0011] The detection component has one end connected to the upper pipeline to provide detection space;

[0012] A secondary measurement component connected to the detection component and used to record the neutron counting rate;

[0013] The lower pipeline is connected to the detection component and the calibration component at both ends respectively. The calibration component, the upper pipeline, the detection component and the lower pipeline form a closed loop and are detachably connected to the boron meter.

[0014] The circulation pump is installed on the lower pipeline and is used to drive the circulation of liquid in the lower pipeline.

[0015] As a possible design, the calibration assembly includes a calibration container and a calibration water tank.

[0016] The calibration container is used to accommodate the calibration water tank;

[0017] The two ends of the calibration water tank are connected to the upper pipe and the lower pipe respectively.

[0018] As a possible design, the calibration component further includes a temperature control box, which is arranged adjacent to the calibration water tank and is used to control the temperature of the calibration water tank. The temperature control box is located in the calibration container.

[0019] As a possible design, a heater is installed in the temperature control box, and the heater is located in the calibration water tank.

[0020] As a possible design, the detection assembly includes a detection container and a detection cavity.

[0021] The detection container is used to accommodate the detection cavity;

[0022] The two ends of the detection cavity are connected to the upper pipeline and the lower pipeline respectively.

[0023] As a possible design, the detection assembly further includes a neutron source, which is installed in the detection container and is used to emit a neutron flux.

[0024] As a possible design, the detection cavity is elliptical in shape.

[0025] As a possible design, the secondary measurement component includes a neutron detector, a temperature detector and a data processing unit.

[0026] The neutron detector is installed in the detection assembly and is used to measure the changes in neutron flux;

[0027] The temperature probe is installed on the upper pipeline to measure the circuit temperature;

[0028] The data processing unit is connected to the neutron detector and the temperature detector respectively, and is used for processing and displaying the neutron counting rate and temperature signals.

[0029] As a possible design, the circulation pump is a magnetic pump.

[0030] As a possible design, the upper pipeline and the lower pipeline are installed with on-off valves.

[0031] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0032] The utility model connects the upper pipeline and the lower pipeline to the boron meter respectively, without manual operation, and can drive the circulation of desalted water or boron solution through a circulation pump, and measures the absorption of neutrons through a secondary measurement component to measure the boron concentration, thereby reducing the risk of contamination; and only needs to measure 4 calibration points, which shortens the measurement time to about 4 hours, saving about 60% of the time and reducing the workload of operation and maintenance personnel; and because the measurement time is shortened, the maintenance and detection time of the boron meter can be shortened, the online monitoring time of the boron meter can be increased, and the effectiveness of the real-time online monitoring of the boron meter is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the accompanying drawings:

[0034] Figure 1 This is a schematic structural diagram of a boron meter calibration test device of the present invention;

[0035] Figure 2 It is a side view of the boron meter calibration test device of the present invention.

[0036] Markings and corresponding parts names in the accompanying drawings:

[0037] 1-calibration component; 11-calibration container; 12-temperature control box; 121-heater; 13-calibration water tank; 2-upper pipeline; 3-detection component; 31-detection container; 32-detection cavity; 33-neutron source; 4-secondary measurement component; 41-neutron detector; 42-temperature detector; 43-data processing unit; 5-lower pipeline; 6-circulation pump; 7-on-off valve. DETAILED DESCRIPTION

[0038] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0040] It should be noted that when a component is referred to as being “fixed to” or “disposed on” another component, it can be directly on the other component or indirectly on the other component. When a component is referred to as being “connected to” another component, it can be directly or indirectly connected to the other component.

[0041] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0043] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrated connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0044] Example

[0045] This embodiment provides a boron meter calibration test device, such as Figure 1-Figure 2 As shown, it is used to perform calibration tests on boron meters, reduce the risks of operators, shorten the time spent on boron meter calibration, reduce the burden on boron meter operation and maintenance personnel, and ensure that the concentration of boron solution in the reactor loop is monitored online in real time for a longer period of time. The calibration component 1 is used to load desalted water or boron solution of target concentration, and the shape of the calibration component 1 can be cylindrical, box-shaped, or other shapes; the upper pipeline 2 is docked with one end of the calibration component 1, preferably docked with the upper end of the calibration component 1, and the upper pipeline 2 is detachably connected to the boron meter, preferably, it can be connected to the upper pipeline 2 through a three-way connector, so as to perform calibration tests on the boron meter; one end of the detection component 3 is docked with the upper pipeline 2, and preferably, the top of the detection component 3 is connected to the upper pipeline 2 to realize the boron in the detection component 3. Solution or deionized water is input into the calibration component 1, and a measurement space is provided for the secondary measurement component 4; the secondary measurement component 4 is connected to the detection component 3 for recording the neutron count rate and temperature; the lower pipeline 5 has its two ends docked with the bottom of the detection component 3 and the bottom of the calibration component 1 respectively, and the calibration component 1, the upper pipeline 2, the detection component 3 and the lower pipeline 5 form a closed loop, and are detachably connected to the boron meter to realize the calibration test of the boron meter; a circulation pump 6 is installed on the lower pipeline 5 to drive the circulation of the liquid in the lower pipeline 5 and make the concentration of the boron solution uniform.

[0046] In some embodiments, as Figure 1-Figure 2 As shown, the calibration assembly 1 includes a calibration container 11 and a calibration water tank 13. The calibration container 11 is used to accommodate the calibration water tank 13 and can be made of a hard material. The interior of the calibration water tank 13 is hollow and is used to accommodate the calibration water tank 13. The top and bottom ends of the calibration water tank 13 are respectively connected to the upper pipe 2 and the lower pipe 5, so that the solution inside can circulate.

[0047] In some embodiments, as Figure 1-Figure 2 As shown, the calibration component 1 further includes a temperature control box 12, which is located in the calibration container 11 and adjacent to the calibration water tank 13, for controlling the temperature of the calibration water tank 13 so that the temperature of the calibration water tank 13 is maintained at 30±1°C.

[0048] In some embodiments, as Figure 1-Figure 2 As shown, a heater 121 is installed in the temperature control box 12, and the heating end of the heater 121 is located in the calibration water tank 13, which can ensure that the boron solution or desalted water in the closed loop can stabilize the temperature at 30±1°C.

[0049] In some embodiments, as Figure 1-Figure 2As shown, the detection assembly 3 includes a detection container 31 and a detection cavity 32. The detection container 31 is used to accommodate the detection cavity 32. The detection container 31 can be of any shape and is arranged adjacent to the calibration container 11. The detection cavity 32 is located within the detection container 31, and its upper and lower ends are connected to the upper pipeline 2 and the lower pipeline 5 respectively, thereby ensuring that the calibration water tank 13, the upper pipeline 2, the lower pipeline 5, and the detection cavity 32 can form a closed loop to achieve solution circulation.

[0050] In some embodiments, as Figure 1-Figure 2 As shown, the above-mentioned detection component 3 also includes a neutron source 33. The neutron source 33 is installed in the detection container 31, and the output end is located in the detection cavity 32, which is used to emit a neutron flow. When these neutrons pass through the boron water to be tested, they will undergo nuclear reactions with boron and be partially absorbed. By measuring the changes in the neutron flow before and after passing through the boron water, the concentration of the boron water can be indirectly inferred.

[0051] In some embodiments, as Figure 1-Figure 2 As shown, the detection cavity 32 is elliptical in shape, ensuring that the lower pipe 5 at the lower end of the elliptical cavity and the upper pipe 2 at the upper end are located at the bottom and top of the ellipse respectively, to avoid the accumulation and movement of bubbles in the cavity. If there are bubbles or the movement of bubbles in the cavity, it will significantly affect the measurement accuracy of the boron concentration.

[0052] In some embodiments, as Figure 1-Figure 2 As shown, the secondary measurement component 4 includes a neutron detector 41, a temperature detector 42, and a data processing unit 43. The neutron detector 41 is installed in the detection component 3, specifically, in the detection container 31, and is used to measure the change of the neutron flux in the detection cavity 32 before and after passing through the boron water. When the neutron flux emitted by the neutron source passes through the medium containing boron, some neutrons will undergo nuclear reactions with the boron, causing the neutron flux to be absorbed and scattered, thereby changing the intensity of the neutron flux. The neutron detector measures this change and transmits the change signal to the data processing unit 43, which can indirectly infer the boron concentration; the temperature detector 42 is installed on the upper pipeline 2, specifically at the junction of the upper pipeline 2 and the detection cavity 32, and is used to measure the circuit temperature, thereby reducing the influence of temperature on the physical properties of the boron solution and reducing the influence on the neutron count rate measurement; the data processing unit 43 is connected to the neutron detector 41 and the temperature detector 42 respectively, receives the neutron count rate signal and the temperature signal respectively, and processes both to obtain the concentration of the boron solution.

[0053] In some embodiments, as Figure 1-Figure 2 As shown, the circulation pump 6 is a magnetic pump, which can provide power for the circulation of the closed loop.

[0054] In some embodiments, as Figure 1-Figure 2As shown, the upper pipeline 2 and the lower pipeline 5 are both installed with on-off valves 7 to facilitate the on-off control of the upper pipeline 2 and the lower pipeline 5. The upper pipeline 2 and the lower pipeline 5 can be closed when not in use.

[0055] When using this test device, the following steps are included:

[0056] S1. First, the neutron detector 41, the temperature detector 42, and the data processing unit 43 start to operate normally. The data processing unit 43 sets the neutron count rate acquisition time to 100 seconds, that is, a neutron count rate n is given every 100 seconds;

[0057] S2. The closed loop circuit of the calibration water tank 13, the upper pipe 2, the lower pipe 5 and the detection chamber 32 is filled with deionized water, and the circulation pump 6 is started to circulate the deionized water from bottom to top. The temperature of the temperature control box 12 is controlled to 30° C., thereby ensuring that the temperature of the deionized water in the closed loop circuit is 30° C. The temperature signal is transmitted to the data processing unit 43 through the temperature detector 42 for processing and display;

[0058] S3. After the closed loop circulates for 30 minutes, 10 neutron count rates are recorded in the data processing unit 43 and the average value is calculated. The average neutron count rate is recorded as n1. At this time, the boron concentration is 0 mg / L, and the boron concentration is recorded as P1. In this way, the data pair of the first calibration point n1 to P1 is obtained.

[0059] S4. Add boric acid or boric acid solution to the calibration water tank 13, adjust the concentration of the boron solution in the closed loop to 0.5H ± 50 mg / L, control the temperature of the boron solution in the closed loop to 30 ± 1°C, and perform chemical sampling and chemical titration analysis after the closed loop circulates for at least 30 minutes. The titration analysis value is recorded as P2. While chemical sampling, record 10 neutron count rates on the calibration interface of the data processing unit 43 and calculate the average value. The average neutron count rate is recorded as n2, thus obtaining the 2# calibration point data pair n2 to P2;

[0060] S5. Referring to the method of step S4, the concentration of the boron solution in the closed loop is adjusted to (H ± 50) mg / L, and the data pair of calibration point 3# n3 to P3 is measured. Then, the concentration of the boron solution in the closed loop is adjusted to (S ± 50) mg / L, and the data pair of calibration point 4# n4 to P4 is measured;

[0061] S6. Substitute the data pairs n1~P1, n2~P2 and n3~P3 into the relationship 1 / n=A1P 2 +B1P+C1, we get a three-variable linear equation system, and solve the equation system to get the calibration coefficients A1, B1 and C1 in the boron concentration range of 0 to H (mg / L);

[0062] S7, referring to the method of step S6, the data pairs n1~P1, n3~P3 and n4~P4 are respectively substituted into the relationship 1 / n=A2P 2 +B2P+C2, we get a three-variable linear equation system, and solve the equation system to get the calibration coefficients A2, B2 and C2 in the boron concentration range of H (mg / L) to S (mg / L);

[0063] S8. Embed the calibration coefficients A1, B1 and C1 and A2, B2 and C2 into the boron meter parameter interface to complete the boron meter calibration.

[0064] The above boron concentration is calculated in sections:

[0065] 0~H(mg / L):1 / n=A1P 2 +B1P+C1;

[0066] H (mg / L) ~ S (mg / L): 1 / n = A2P 2 +B2P+C2

[0067] Where: n is the neutron count rate, cps;

[0068] P is the concentration of boron solution, mg / L;

[0069] A1, B1, C1 and A2, B2, C2 are calibration coefficients;

[0070] The boron meter obtains the neutron count rate n in real time and calculates the boron concentration P using the calibration coefficient.

[0071] Comparing the boron concentration measured by traditional chemical titration and the boron concentration measured by this device, taking the measurement as an example, the calibration errors of 1-4# are -1.1mg / L, 0.8mg / L, -0.6%, and 0.2%, respectively, which fully demonstrates that the measurement accuracy of this device is high and it can effectively save time.

[0072] The utility model not only relieves the pressure on the boron meter operators in nuclear power plants, but also greatly reduces the time consumption for boron meter calibration. Compared with the conventional manual calibration by staff, the utility model can save more than 60% of the time. The measured verification data of the utility model fully meets the measurement error requirements of the boron meter, and the rapid calibration improves the effectiveness of the real-time online monitoring of the boron meter.

[0073] The utility model connects the upper pipeline and the lower pipeline to the boron meter respectively, without manual operation, and can drive the circulation of desalted water or boron solution through a circulation pump, and measures the absorption of neutrons through a secondary measurement component to measure the boron concentration, thereby reducing the risk of contamination; and only needs to measure 4 calibration points, which shortens the measurement time to about 4 hours, saving about 60% of the time and reducing the workload of operation and maintenance personnel; and because the measurement time is shortened, the maintenance and detection time of the boron meter can be shortened, the online monitoring time of the boron meter can be increased, and the effectiveness of the real-time online monitoring of the boron meter is improved.

[0074] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only a specific implementation method of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the utility model should be included in the scope of protection of the utility model.

Claims

1. A boron meter calibration test device, characterized in that: include Calibration assembly, used to fill with deionized water or boron solution of target concentration; The upper pipeline is butted against one end of the calibration component and is detachably connected to the boron meter; A detection component, one end of which is connected to the upper pipeline to provide a detection space; a secondary measurement component connected to the detection component and used to record the neutron counting rate; The lower pipeline has two ends respectively connected to the detection component and the calibration component, and the calibration component, the upper pipeline, the detection component and the lower pipeline form a closed loop and are detachably connected to the boron meter; A circulation pump is installed on the lower pipeline and is used to drive the liquid in the lower pipeline to circulate.

2. A boron meter calibration test device according to claim 1, characterized in that: The calibration component includes a calibration container and a calibration water tank, The calibration container is used to accommodate a calibration water tank; The two ends of the calibration water tank are connected to the upper pipeline and the lower pipeline respectively.

3. A boron meter calibration test device according to claim 2, characterized in that: The calibration component further includes a temperature control box, which is disposed adjacent to the calibration water tank and is used to control the temperature of the calibration water tank. The temperature control box is located in the calibration container.

4. A boron meter calibration test device according to claim 3, characterized in that: A heater is installed in the temperature control box, and the heater is located in the calibration water tank.

5. A boron meter calibration test device according to claim 1, characterized in that: The detection assembly includes a detection container and a detection cavity, The detection container is used to accommodate the detection cavity; The two ends of the detection cavity are connected to the upper pipeline and the lower pipeline respectively.

6. A boron meter calibration test device according to claim 5, characterized in that: The detection assembly further includes a neutron source, which is installed in the detection container and is used to emit a neutron flux.

7. A boron meter calibration test device according to claim 5, characterized in that: The detection cavity is elliptical in shape.

8. A boron meter calibration test device according to claim 1, characterized in that: The secondary measurement component includes a neutron detector, a temperature detector and a data processing unit. The neutron detector is installed in the detection assembly and is used to measure the change of neutron flux; The temperature detector is installed on the upper pipeline and is used to measure the circuit temperature; The data processing unit is connected to the neutron detector and the temperature detector respectively, and is used for processing and displaying the neutron counting rate and temperature signals.

9. A boron meter calibration test device according to claim 1, characterized in that: The circulating pump is a magnetic pump.

10. The boron meter calibration test device according to claim 1, characterized in that: The upper pipeline and the lower pipeline are equipped with on-off valves.

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