Control rod value measurement method, system and equipment and storage medium

Abstract

The invention provides a control rod value measurement method, system and device and a storage medium, the method comprises the following steps: determining boronizing time of a nuclear reactor for boronizing reaction, the boronizing time being a preset multiple of operation time required by a control rod to complete a single rod lifting operation, and the preset multiple being greater than 1; the boronizing method comprises the following steps of: introducing a first volume of boric acid solution into a first loop of a reactor at a first speed for boronizing, and synchronously introducing a second volume of demineralized water at a second speed for diluting; and controlling the control rod of the single rod cluster to carry out rod lifting so as to measure the reactivity value of the control rod according to the reactivity change of the reactor in the rod lifting process. According to the embodiment of the invention, slow boronizing can be realized, the boronizing time can be effectively prolonged so as to reduce the proportion of the rod lifting time of the control rod, the influence of a spatial effect during rod lifting is effectively reduced, and the situation of inaccurate reactivity measurement caused by too fast reactivity change during rod lifting is reduced, so that the accuracy of value measurement of the control rod is improved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power plant control technology, and in particular to a control rod value measurement method, system, equipment and storage medium. Background Art

[0002] During the operation of a nuclear reactor, the insertion of control rods will cause changes in the neutron flux. Therefore, before and after the transient state of the asymmetrically distributed control rods, there is a certain deviation between the measured reactivity and the actual reactivity of the core as a whole. This phenomenon is called the spatial effect of reactivity measurement.

[0003] In the process of measuring the value of small-value control rods of a single-rod bundle, since the value of a single small-value control rod is easily covered by a small amount of boronization or dilution, the reactivity of the nuclear reactor changes suddenly, the spatial effect of the reactivity measurement is aggravated, and the reactivity changes caused by the lifting and insertion of the small-value control rod cannot be accurately measured, resulting in low accuracy in the value measurement of the small-value control rod. Summary of the invention

[0004] The present invention provides a control rod value measurement method, system, device and storage medium to solve the problem that in the existing control rod value measurement process, the reactivity change caused by the lifting and inserting of the rod cannot be accurately measured, resulting in low accuracy in the value measurement of small value control rods.

[0005] In a first aspect, an embodiment of the present application provides a control rod value measurement method, comprising:

[0006] Determine the boronization time of the nuclear reactor for boronization reaction, the boronization time is a preset multiple of the operation time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1;

[0007] During the boriding time, perform the following steps:

[0008] Introducing a first volume of boric acid solution into a first loop of a reactor at a first speed for boronization, and simultaneously introducing a second volume of demineralized water at a second speed for dilution;

[0009] The control rods of a single rod bundle in a nuclear reactor are controlled to be lifted, so as to measure the reactivity value of the control rods according to the change of the reactor reactivity during the rod lifting process.

[0010] Optionally, the second speed is determined by:

[0011] Determine the initial concentration of the boric acid solution in the first loop of the reactor before the introduction of desalted water;

[0012] Determine the dilution concentration value of the boric acid solution when introducing desalted water for dilution;

[0013] Determining a second volume of desalted water according to the initial concentration value, the dilution concentration value and the loop volume of the first loop of the reactor;

[0014] The second volume of deionized water is divided by the boration time to obtain a second rate.

[0015] Optionally, determining the dilution concentration value of the boric acid solution when introducing desalted water for dilution comprises:

[0016] Determining the boration reactivity of introducing a boric acid solution for boration alone within the boration time according to the first speed, and determining the dilution reactivity of introducing desalted water according to the boration reactivity;

[0017] According to the dilution reactivity, the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution is determined.

[0018] Optionally, according to the first speed, determining the boration reactivity of introducing a boric acid solution for boration alone within the boration time, and determining the dilution reactivity of introducing desalted water according to the boration reactivity, comprising:

[0019] According to the demand measurement of the value of the control rod, the total demand reactivity of the nuclear reactor during the boriding process is determined during the boriding time, and the total demand reactivity is greater than the value of the control rod;

[0020] Predicting a first reactivity introduction rate for introducing the boric acid solution for a single borylation reaction according to the first volume and the first rate, and multiplying the first reactivity introduction rate by the borylation time to obtain a borylation reactivity for introducing the boric acid solution for a single borylation reaction within the borylation time;

[0021] The total demand reactivity minus the boration reactivity gives the dilution reactivity for dilution with deionized water introduced during the boration time.

[0022] Optionally, according to the dilution reactivity, determining the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution comprises:

[0023] Determine the differential value of boron in the boric acid solution after diluting the boric acid solution by introducing deionized water;

[0024] The dilution concentration of the boric acid solution is determined based on the initial concentration, dilution reactivity and boron differential value of the boric acid solution.

[0025] Optionally, controlling a control rod of a single rod bundle in a nuclear reactor to lift the rod, so as to measure the reactivity value of the control rod according to the reactivity change of the reactor during the rod lifting process, comprises:

[0026] Controlling the control rods of the single rod bundle to perform a rod lifting operation, and monitoring the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor, and obtaining the reactivity change data of the nuclear reactor;

[0027] The reactivity value of the control rods of a single rod cluster is determined based on the reactivity variation data.

[0028] Optionally, controlling the control rods of the single rod bundle to perform a rod lifting operation, and monitoring the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor, to obtain reactivity change data of the nuclear reactor, including:

[0029] The control rods of a single rod bundle are controlled by a segmented rod lifting method to perform multiple rod lifting operations, and the reactivity change of the nuclear reactor is monitored during each rod lifting process to obtain the reactivity change data when the control rods are lifted from the lowest position to the top of the nuclear reactor;

[0030] There is a preset time interval between two adjacent rod lifting operations, and the preset time is a pre-calibrated static time required for the nuclear reactor after the rod lifting.

[0031] In a second aspect, an embodiment of the present application provides a control rod value measurement system, including a control rod and a control rod value measurement device, wherein the control rod value measurement device is used to:

[0032] Determine the boronization time of the nuclear reactor for boronization reaction, the boronization time is a preset multiple of the operation time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1;

[0033] During the boriding time, perform the following steps:

[0034] Introducing a first volume of boric acid solution into a first loop of a reactor at a first speed for boronization, and simultaneously introducing a second volume of demineralized water at a second speed for dilution;

[0035] The control rods of a single rod bundle in a nuclear reactor are controlled to be lifted, so as to measure the reactivity value of the control rods according to the change of the reactor reactivity during the rod lifting process.

[0036] In a third aspect, an embodiment of the present application provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the control rod value measurement method described above when executing the computer program.

[0037] In a fourth aspect, an embodiment of the present application provides a readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the steps of the above-mentioned control rod value measurement method are implemented.

[0038] In a scheme provided by the control rod value measurement method, system, equipment and storage medium mentioned above, the boronization time of a nuclear reactor for boronization reaction is determined, and the boronization time is a preset multiple of the operating time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1; the following steps are performed during the boronization time: a first volume of boric acid solution is introduced into the first loop of the reactor for boronization at a first speed, and a second volume of desalted water is introduced at a second speed for dilution; the control rods of a single rod bundle in the nuclear reactor are controlled to lift the rods, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process. In this embodiment, a preset multiple of the control rod single rod lifting time is used as the boration time, and a first volume of boric acid solution is introduced into the first loop of the reactor for boration at a first speed, and a second volume of desalted water is simultaneously introduced at a second speed for boration dilution, which can reduce the average boron concentration of the liquid in the loop to achieve slow boration, effectively extend the boration time and reduce the proportion of the control rod lifting time in the boration time, effectively reduce the influence of the spatial effect when lifting the rod, and reduce the situation where the reactivity changes too quickly when lifting the rod, resulting in inaccurate reactivity measurement, thereby improving the accuracy of the control rod value measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0040] Figure 1 is a structural schematic diagram of a control rod value measurement system in one embodiment of the present invention;

[0041] Figure 2 is another structural schematic diagram of a control rod value measurement system in one embodiment of the present invention;

[0042] Figure 3 is a schematic diagram of a process of a control rod value measurement method in one embodiment of the present invention;

[0043] Figure 4 yes Figure 3 A schematic diagram of an implementation process of step S20;

[0044] Figure 5 is a schematic diagram of a process for determining a second speed of desalted water in one embodiment of the present invention;

[0045] Figure 6 yes Figure 5 A schematic diagram of an implementation flow of step S02;

[0046] Figure 7yes Figure 1 or Figure 2 A schematic diagram of the structure of a device for measuring the value of a middle control rod;

[0047] Figure 8 It is a schematic diagram of the structure of an electronic device in one embodiment of the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or their collections. It should also be understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0050] In addition, in the description of the present specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0051] References to "one embodiment" or "some embodiments" etc. described in the present specification mean that one or more embodiments of the present invention include specific features, structures or characteristics described in conjunction with the embodiment. Therefore, the statements "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0052] It should be understood that the order of execution of the steps in the following embodiments does not imply a precedence of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0053] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0054] It should be understood that the control rod value measurement is an important part of the physical test verification of the first nuclear reactor. Usually, the detector of the nuclear instrument system is used to measure the reactivity change of the nuclear reactor during the insertion or withdrawal of the control rod to determine the reactivity value of the control rod. The detector of the nuclear instrument system is outside the nuclear reactor. During the operation of the nuclear reactor, when the rod position of the asymmetric control rod changes, such as when a single rod bundle is inserted or withdrawn, the axial and radial disturbances of the nuclear reactor are triggered, and the neutron flux density distribution shape of the nuclear reactor changes to an asymmetric distribution, causing uneven changes in the asymmetric neutron flux. Therefore, before and after the transient state of the rod insertion and withdrawal, the reactivity data measured by the detector deviates from the actual reactivity of the nuclear reactor. This is the spatial effect of the reactivity measurement of the nuclear reactor.

[0055] Small value control rods are called low value control rods. Small value control rods have little impact on the reactivity change of nuclear reactors, and their reactivity control is relatively stable throughout the life of the nuclear reactor. The traditional method of measuring the value of small value control rods is usually boronization or dilution measurement. Since the boric acid concentration in the boric acid tank of the traditional nuclear reactor chemical volume system (i.e., chemical and volume control system) is high, and the value of a single small value control rod is small, only a small amount of boronization or desalted water dilution is needed to completely cover the reactivity value of the small value control rod. The boronization or dilution time is short, and the reactivity of the nuclear reactor changes too quickly, making it difficult to accurately measure the reactivity change of the nuclear reactor when the rod is lifted or inserted; in addition, due to the limitation of the lifting and insertion rate of the control rod during power, the time required for the small value control rod to complete the lifting and insertion action accounts for a longer proportion of its boronization or dilution time, and the measured reactivity change is more significantly affected by the spatial effect, resulting in the measured reactivity further deviating from the actual reactivity, thereby causing a deviation in the measurement of the control rod value reactivity.

[0056] Taking all the above factors into consideration, compared with the value measurement process of symmetrical rod lifting and large-value control rods, the nonlinear change of the reactivity of the nuclear reactor in the value measurement process of small-value control rods accounts for a larger proportion and is significantly affected by the spatial effect. At this time, the reactivity data measured by the detector cannot truly reflect the true value of the small-value control rods in the nuclear reactor, resulting in low accuracy in the value measurement of small-value control rods.

[0057] The control rod value measurement method provided by the embodiment of the present invention can be applied in the following aspects: Figure 1 In the control rod value measurement system shown, the control rod value measurement system includes a control rod and a control rod value measurement device. The control rod is pre-inserted into the nuclear reactor. The control rod value measurement device controls the control rod by determining the structure. The control rod in this embodiment is a small value control rod, such as a gray rod.

[0058] Among them, the control rod value measurement device is used to: determine the boronization time of the nuclear reactor for boronization reaction, the boronization time is a preset multiple of the operating time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1; perform the following steps during the boronization time: introduce a first volume of boric acid solution into the first loop of the reactor for boronization at a first speed, and control the chemical volume system to synchronously introduce a second volume of desalted water at a second speed for boronization dilution; at the same time, it is also necessary to control the control rods of a single rod bundle in the nuclear reactor to lift the rods, so as to measure the reactivity value of the control rods according to the reactivity changes of the reactor during the rod lifting process.

[0059] In this embodiment, a preset multiple of the control rod single rod withdrawal time is used as the boration time, and a first volume of boric acid solution is introduced into the first loop of the reactor for boration at a first speed, and a second volume of desalted water is simultaneously introduced at a second speed for boration dilution, which can reduce the average boron concentration of the liquid in the loop to achieve slow boration, effectively extend the boration time and reduce the proportion of the control rod withdrawal time in the boration time, effectively reduce the influence of the reactivity space effect when the control rod is withdrawn, and reduce the situation where the reactivity changes too quickly when the rod is withdrawn, resulting in inaccurate reactivity measurement, thereby improving the accuracy of the control rod value measurement.

[0060] In this embodiment, the control rod value measurement system includes a control rod and a control rod value measurement device, which is only an exemplary description. In one embodiment, if Figure 2 As shown, the control rod value measurement system also includes a chemical volume system of the nuclear reactor, and the control rod value measurement device communicates with the chemical volume system through a network or cable. Among them, the chemical volume system includes a boric acid pump and a desalted water pump. The control rod value measurement device is specifically used to: determine the boronization time of the nuclear reactor for boronization reaction, the boronization time is a preset multiple of the operating time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1; perform the following steps during the boronization time: control the boric acid pump of the chemical volume system to introduce a first volume of boric acid solution into the first loop of the reactor for boronization at a first speed, and synchronously control the desalted water pump of the chemical volume system to introduce a second volume of desalted water at a second speed for boronization dilution; at the same time, it is also necessary to control the control rods of a single rod bundle in the nuclear reactor to lift the rods, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process.

[0061] In other embodiments, the control rod value measurement system also includes other necessary devices of the nuclear reactor, such as a boric acid concentration meter, a detector for measuring reactivity, and other various sensors, which will not be described in detail here.

[0062] The control rod value measurement system may be a nuclear reactor control system, and the control rod value measurement device may be an electronic control unit. In other embodiments, the control rod value measurement device may be a terminal device or a server; the terminal device includes but is not limited to various personal computers, laptops, smart phones, tablet computers, and portable wearable devices; the server may be implemented as an independent server or a server cluster consisting of multiple servers.

[0063] In one embodiment, if Figure 3 As shown, a control rod value measurement method is provided, and the method is applied in Figure 1 The control rod value measuring device in the embodiment of the present invention is taken as an example to illustrate, and the steps are as follows:

[0064] S10: Determine a boronization time for a nuclear reactor to perform a boronization reaction, where the boronization time is a preset multiple of the operating time required for a control rod to complete a single rod lifting operation, and the preset multiple is greater than 1.

[0065] When measuring the value of a small-value control rod, the control rod value measurement device needs to first determine the boronization time of the nuclear reactor for the boronization reaction, wherein the boronization time is a preset multiple of the operating time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1.

[0066] The running time required for the control rod to complete a single rod lifting operation may be a calibrated empirical value or a value determined based on the control rod operation data. The running time required for the control rod to complete a single rod lifting operation is calculated by multiplying the number of control rod stroke steps by the movement rate, where the movement rate is n steps / minute.

[0067] The boriding time is a preset multiple of the operating time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1. In one embodiment, the preset multiple may be 2-3 times, that is, the boriding time is 2-3 times the operating time required for the control rod to complete a single rod lifting operation, which can both extend the boriding time to a certain extent and reduce the nuclear waste water generated by the boriding reaction.

[0068] For example, limited by the existing control rod lifting rate, the stroke of the control rods of the second and third generation pressurized water reactors in China is generally 5-225 steps, a total of 220 steps. According to the movement rate of lifting or inserting the control rod of 48 steps / minute, the complete operation data of the control rod lifting or inserting takes about 4.58 minutes, so the operation time required for the control rod to complete a single lifting operation can be 4.58 minutes, or a value slightly greater than 4.58 minutes, such as 5 minutes. The single boronization time is 2-3 times the operation time required for the control rod to complete a single lifting operation, that is, the single boronization time can be 10 minutes to 15 minutes.

[0069] S20: executing the steps during the boronization time: introducing a first volume of boric acid solution into the first loop of the reactor for boronization at a first speed, and simultaneously introducing a second volume of desalted water at a second speed for dilution; controlling the control rods of a single rod bundle in the nuclear reactor to lift the rods, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process.

[0070] After determining the boronization time for the nuclear reactor to carry out the boronization reaction, the nuclear reactor is started to be boronized and diluted. During the boronization and dilution process, the control rods of the single rod bundle in the nuclear reactor are controlled to be lifted to complete the value measurement of the control rods.

[0071] Specifically, after determining the boronization time for the nuclear reactor to perform the boronization reaction, the control rod value measuring device performs the following steps within the boronization time:

[0072] The control rod value measuring device controls the boric acid pump of the chemical volume system to introduce a first volume of boric acid solution into the first loop of the reactor for boronization at a first speed, and synchronously controls the desalted water pump of the chemical volume system to introduce a second volume of desalted water at a second speed for boronization dilution, so as to introduce the reactivity of the nuclear reactor at a certain rate and reduce the rate of change of the reactivity;

[0073] The control rod value measuring device controls the control rods of a single rod bundle in a nuclear reactor to lift the rods, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process.

[0074] It should be understood that, subject to the minimum flow rate of the boric acid pump (such as the boric acid pump) of the chemical capacity system of the nuclear power plant and the high concentration of boric acid in the boric acid tank, the boration operation needs to be performed at a certain flow rate and a certain boron concentration. The negative reactivity introduction rate is high, and the reactivity of the simple boration method cannot meet the slow reactivity introduction. In this embodiment, a boration plus dilution method is adopted. When a first volume of boric acid solution is introduced at a first speed for boration reaction, a second volume of desalted water is simultaneously introduced at a second speed to change the boron-water ratio of the first loop of the reactor, thereby reducing the average boron concentration of the liquid entering the first loop of the reactor, so that it is lower than the boric acid concentration in the boric acid tank and slightly higher than the boron concentration of the first loop, so as to achieve slow boration.

[0075] Among them, the first speed of introducing the boric acid solution can be calibrated by user needs, that is, the first speed can be a calibrated speed. The first speed can be the minimum pumping speed that the boric acid pump can reach in the volumetric system, or it can be a speed close to the minimum pumping speed, that is, the difference between the first speed and the minimum pumping speed that the boric acid pump can reach is greater than or equal to 0 and less than 10% of the minimum pumping speed. Pumping the boric acid solution at a minimum pumping speed close to the boric acid pump can further extend the boration time and reduce the introduction rate of nuclear reactor reactivity. After determining the first speed, the first volume of the boric acid solution introduced can be determined based on the first speed and the boration reaction, and the first volume is the product of the first speed and the boration reaction.

[0076] Among them, the second speed is determined according to the first speed, and the second speed increases with the increase of the first speed to ensure that the desalted water is sufficient to dilute the boric acid solution, realize slow boration, and reduce the reactivity change rate of the nuclear reactor. Specifically, the total required reactivity of the nuclear reactor when the boration dilution is carried out within the boration time can be predetermined, and the total required reactivity is determined according to the reactivity value of the small value control rod, and the total required reactivity needs to be slightly larger than the reactivity value of the small value control rod to avoid the value of the small value control rod being instantly covered due to the excessive total required reactivity; the second volume of the desalted water introduced can be determined according to the first volume and the first speed of the boric acid solution, and the total required reactivity of the nuclear reactor when the boration dilution is carried out within the boration time; and then the second volume is divided by the boration time to obtain the second speed of introducing the desalted water, so that the second speed increases with the increase of the first speed, and after the introduction of the first volume of the boric acid solution and the introduction of the second volume of the desalted water, the reactivity change of the nuclear reactor is within the required range to meet the value measurement requirements of the small value control rod.

[0077] In this embodiment, a first volume of boric acid solution is introduced into the first loop of the reactor at a first speed for boronization, and a second volume of desalted water is introduced at a second speed for boronization dilution, which can reduce the average boron concentration of the liquid in the loop to achieve slow boronization. On the one hand, the value of the small value control rod is measured by the method of boronization plus dilution, so as to extend the boronization time, reduce the rate of reactivity change in the nuclear reactor, thereby reducing the influence of the reactivity space effect, and reduce the situation where the reactivity quickly covers the reactivity value of the value control rod, thereby improving the accuracy of value measurement. On the other hand, the single rod lifting time of the control rod with a preset multiple is used as the boronization time, which can further extend the boronization time, thereby further improving the accuracy of value measurement. By effectively extending the boronization time, the proportion of the control rod lifting time in the boronization time can be reduced, the influence of the reactivity space effect when the control rod is lifted is effectively reduced, and the situation where the reactivity change is too fast when the rod is lifted, resulting in inaccurate reactivity measurement, is reduced, thereby improving the accuracy of the control rod value measurement.

[0078] In addition, the control rod value measurement method provided by the embodiment of the present invention can effectively reduce the boronization and dilution rates of the nuclear reactor while keeping the chemical volume system structure of the nuclear power plant unchanged, achieve a smoother introduction of reactivity during the measurement of a single small-value control rod value, improve the accuracy of reactivity measurement, and alleviate the spatial effect caused by the lifting of asymmetric control rods, thereby achieving accurate value measurement of asymmetric small-value control rods.

[0079] In one embodiment, during the process of introducing a first volume of boric acid solution at a first speed and a second volume of desalted water at a second speed, it is necessary to monitor the reactivity changes in the nuclear reactor in real time. When the reactivity is less than a certain value, the control rods of a single rod bundle in the nuclear reactor are controlled to lift the rods, thereby avoiding safety risks caused by excessively low reactivity of the nuclear reactor.

[0080] In one embodiment, if Figure 4 As shown, in step S20, the control rods of a single rod bundle in a nuclear reactor are controlled to be lifted, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process, which specifically includes the following steps:

[0081] S21: Control the control rods of the single rod bundle to perform a rod lifting operation, and monitor the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor, to obtain the reactivity change data of the nuclear reactor.

[0082] After determining the boriding time for the nuclear reactor to carry out the boriding reaction, the control rod value measurement device needs to control the control rods of the single rod bundle to perform the rod lifting operation within the boriding time, and monitor the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position of the nuclear reactor to the top through the detectors in the nuclear instrument system (such as the power range probe), and obtain the reactivity change data of the nuclear reactor, and then determine the reactivity value of the control rods of the single rod bundle based on the reactivity change data.

[0083] Among them, after determining the boriding time for the nuclear reactor to carry out the boriding reaction, the control rod value measurement device controls the control rods of the single rod bundle to perform a one-time rod lifting operation within the boriding time, that is, the control rods of the single rod bundle are lifted from the lowest position of the nuclear reactor to the top once, and the reactivity change of the nuclear reactor during the one rod lifting process is recorded to obtain the reactivity change data when the control rods are lifted from the lowest position of the nuclear reactor to the top.

[0084] S22: Determine the reactivity value of the control rods of the single rod cluster according to the reactivity change data.

[0085] After the reactivity change data of the nuclear reactor is obtained, the control rod value calculation is performed based on the reactivity change data to obtain the reactivity value of the control rods of the single rod bundle.

[0086] For example, the absolute value of the reactivity change from the initial moment of raising the rod to the end moment of raising the rod can be used as the reactivity value of the control rod of the single rod bundle. In other embodiments, the reactivity value of the control rod can also be determined according to the reactivity change data in other ways, such as performing integration or differentiation calculation on the reactivity change data, which will not be described in detail here.

[0087] In this embodiment, the control rods of the single rod bundle are controlled to perform a rod lifting operation, and the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor is monitored to obtain the reactivity change data of the nuclear reactor, and the reactivity value of the control rods of the single rod bundle is determined based on the reactivity change data. The measurement process of the reactivity value of the control rods is clarified. By monitoring the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor, the reactivity change data of the nuclear reactor is obtained, and then the reactivity value of the control rods of the single rod bundle is determined. This is simple and intuitive, and ensures the accuracy of the control rod value measurement.

[0088] In one embodiment, step S21, i.e., controlling the control rods of the single rod bundle to perform a rod lifting operation and monitoring the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor to obtain the reactivity change data of the nuclear reactor, specifically includes the following steps:

[0089] S211: The control rods of a single rod bundle are controlled by a segmented rod lifting method to perform multiple rod lifting operations, and the reactivity change of the nuclear reactor during each rod lifting process is monitored to obtain the reactivity change data when the control rods are lifted from the lowest position to the top of the nuclear reactor.

[0090] Among them, there is a preset time interval between two adjacent rod lifting operations, and the preset time is the pre-calibrated static time required for the nuclear reactor after the rod lifting. The preset time can be 15 minutes, that is, when the control rods of a single rod bundle are controlled by the segmented rod lifting method for multiple rod lifting operations, after each rod lifting operation is completed, it is necessary to wait for 15 minutes before the next rod lifting operation can be performed until the control rods are completely lifted to the top. Waiting for the preset time before performing the rod lifting operation during each rod lifting process can allow the nuclear reactor to be fully static, and the rod lifting process can be performed after its static space effect decays over time, so that more accurate reactivity data can be measured.

[0091] Specifically, after determining the boronization time for the nuclear reactor to perform the boronization reaction, the control rod value measurement device can control the control rods of the single rod bundle to perform multiple rod lifting operations within a single boronization time, and monitor the reactivity change of the nuclear reactor during each rod lifting process, and obtain the reactivity change data when the control rod is lifted from the lowest position to the top of the nuclear reactor. Among them, two adjacent rod lifting operations need to be separated by a preset time, and the single boronization time needs to be greater than the sum of the preset time and the running time required for the single rod lifting operation, so as to ensure that multiple rod lifting operations are performed within a single boronization time.

[0092] For example, after determining the boronization time of the nuclear reactor for boronization reaction, the control rod value measurement device performs the following steps within the single boronization time:

[0093] S2111: controlling the control rods of the single rod bundle to perform a first rod lifting operation, so as to lift the control rods from the lowest position of the nuclear reactor to a first preset position (or lift the control rods from the lowest position of the nuclear reactor to a preset time), and recording the reactivity change of the nuclear reactor during the process to obtain first reactivity change data;

[0094] S2112: Timing to a preset time, controlling the control rods of the single rod bundle to perform the Nth rod lifting operation, so as to lift the control rods from the current position of the nuclear reactor to a second preset position (or lift the control rods from the current position of the nuclear reactor to a preset time), and recording the reactivity change of the nuclear reactor during the process, obtaining the Nth reactivity change data, and stopping when the rods are lifted to the top, and summarizing the reactivity change data when the control rods are lifted from the lowest position of the nuclear reactor to the top, the reactivity change data includes the first reactivity change data and the Nth reactivity change data, N is an integer greater than 1.

[0095] It should be understood that there are two types of spatial effects caused by control rod insertion or withdrawal: static spatial effects caused by prompt neutrons and dynamic spatial effects caused by delayed neutrons. Among them, static spatial effects are caused by the instantaneous change of prompt neutrons. When the control rods are inserted or withdrawn, the prompt neutron flux density of the nuclear reactor changes, and the shape of the prompt neutron flux density distribution changes in a very short time. Dynamic spatial effects are caused by changes in the shape of the delayed neutron flux density distribution. Due to the long decay time of the delayed neutron precursor nucleus, it usually takes more than ten minutes for the delayed seed distribution shape to reach a stable state after the control rods are inserted or withdrawn.

[0096] When measuring the value of the control rod, the influence of the dynamic space effect can be corrected by extending the boronization time to improve the accuracy of the reactivity measurement. The static space effect is caused by the prompt neutrons inside the core. The prompt neutrons occupy the vast majority of the reactor neutron share. The distribution of prompt neutrons is related to the physical characteristics of the core. During the recording process of the control rod value, the change of the prompt neutrons mainly comes from the lifting and insertion of the control rod. This embodiment, based on the reactivity at a certain rate, controls the value of the rod by lifting the rod multiple times. In this process, it is equivalent to using multiple initial state-final state value analysis, which reduces the change of the prompt neutrons each time the rod is lifted, overcomes the influence of the static space effect, and further improves the accuracy of the reactivity measurement.

[0097] In this embodiment, the segmented rod lifting method is used to control the control rods of a single rod bundle to perform multiple rod lifting operations, and the reactivity change of the nuclear reactor is monitored during each rod lifting process, and the reactivity change data when the control rod is lifted from the lowest position of the nuclear reactor to the top is obtained, wherein a preset time is set between two adjacent rod lifting operations, and the preset time is the pre-calibrated static time required by the nuclear reactor after the rod lifting. The specific process of control rod lifting and reactivity change data of the nuclear reactor is clarified, and the influence of static space effect is reduced through multiple rod lifting operations, further improving the accuracy of reactivity measurement, thereby improving the accuracy of control rod value measurement.

[0098] In other embodiments, the segmented rod lifting method is used to control the control rods of a single rod cluster to perform multiple rod lifting operations. It is also possible to complete multiple rod lifting operations of the control rods of the single rod cluster in multiple boronization times, and perform a rod lifting operation in a single boronization time to lift the rods for a certain distance, until the control rods are segmentedly lifted from the bottom position of the nuclear reactor to the top in multiple boronization times. There is a preset time interval between two adjacent rod lifting operations, that is, there is a preset time interval between two adjacent boronization times.

[0099] Specifically, after determining the boronization time for the nuclear reactor to perform the boronization reaction, a segmented rod lifting method is used to control the control rods of a single rod bundle to perform multiple rod lifting operations, and the reactivity change of the nuclear reactor during each rod lifting process is monitored to obtain the reactivity change data when the control rods are lifted from the lowest position to the top of the nuclear reactor, including the following steps:

[0100] S201: performing the following steps during the boronization time: introducing a first volume of boric acid solution into the first loop of the reactor for boronization at a first speed, and simultaneously introducing a second volume of desalted water at a second speed for dilution; controlling the control rods of the single rod bundle to perform a first rod lifting operation, so as to lift the control rods from the lowest position of the nuclear reactor to a first preset position (or lift the control rods from the lowest position of the nuclear reactor to a preset time), and recording the reactivity change of the nuclear reactor during the process to obtain first reactivity change data;

[0101] S202: timing to a preset time, and executing the following steps within the boration time: introducing a first volume of boric acid solution into the first loop of the reactor for boration at a first speed, and simultaneously introducing a second volume of desalted water at a second speed for dilution; controlling the control rods of the single rod bundle to perform the Nth rod lifting operation, so as to lift the control rods from the current position of the nuclear reactor to a second preset position (or lift the control rods from the current position of the nuclear reactor to a preset time), and recording the reactivity change of the nuclear reactor during the process to obtain the Nth reactivity change data, until the rod lifting is stopped at the top, and the reactivity change data when the control rods are lifted from the lowest position of the nuclear reactor to the top are summarized.

[0102] The reactivity change data includes first reactivity change data and Nth reactivity change data, where N is an integer greater than 1.

[0103] In this embodiment, multiple rod lifting operations of the control rod are completed within multiple boriding times respectively, and there is no need to perform boriding reaction within the preset time interval between adjacent rod lifting operations, thereby reducing the nuclear waste water generated by the boriding reaction.

[0104] In one embodiment, before introducing a first volume of boric acid solution into the first loop of the reactor for boronization at a first speed and simultaneously introducing a second volume of demineralized water at a second speed for dilution, the first speed needs to be predetermined, and the second speed needs to be determined based on the first speed. Figure 5 As shown, before step S20, that is, during the boronization time, the steps of: introducing a first volume of boric acid solution into the first loop of the reactor for boronization at a first speed, and simultaneously introducing a second volume of desalted water at a second speed for dilution; controlling the control rods of a single rod bundle in the nuclear reactor to lift the rods, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process, the method further includes the following steps:

[0105] S01: Determine the initial concentration value of the boric acid solution in the first loop of the reactor before the desalted water is introduced.

[0106] It is necessary to first determine the initial concentration value of the boric acid solution in the first loop of the reactor before the desalted water is introduced, and the initial concentration value is the concentration value when the boric acid solution is introduced at the first speed before the desalted water is introduced. Among them, it can be the minimum boric acid concentration value allowed by the boric acid pump.

[0107] S02: Determine the dilution concentration value of the boric acid solution when introducing desalted water for boration dilution.

[0108] After determining the initial concentration value of the boric acid solution, it is necessary to determine the dilution concentration value of the boric acid solution when the desalted water is introduced to dilute the boric acid solution in the first loop of the reactor, and the dilution concentration value is less than the initial concentration value. The dilution concentration value may be a calibrated concentration value determined in advance as required. In other embodiments, the dilution concentration value may be a time boric acid concentration value measured when a first volume of boric acid solution is introduced at a first speed and a second volume of desalted water is introduced at a second speed, which is more accurate.

[0109] S03: Determine the second volume of desalted water in the boronization process according to the initial concentration value, the dilution concentration value and the loop volume of the first loop of the reactor.

[0110] After determining the dilution concentration value and the initial concentration value of the boric acid solution, the second volume of the desalted water is determined according to the initial concentration value, the dilution concentration value and the loop volume of the first loop of the reactor (ie, the liquid holding volume).

[0111] Specifically, the second volume of desalted water is calculated by the following formula:

[0112]

[0113] Among them, V 水 V represents the second volume, i.e. the volume of deionized water introduced; 回路 Indicates the loop volume of the first loop of the reactor; CB i represents the initial concentration of boric acid solution in the first loop of the reactor before desalted water is introduced; CB f It represents the dilution concentration of the boric acid solution when desalted water is introduced for boronization dilution; the unit of each volume is m 3 The unit of each concentration value is m 3 / h.

[0114] In this embodiment, the calculation method of the second volume is only for illustrative purposes. In other embodiments, the second volume may also be determined by other methods, which will not be described in detail herein.

[0115] S04: Divide the second volume of the desalted water by the boronization time to obtain a second speed.

[0116] After determining the second volume of desalted water, the second speed is determined according to the second volume of desalted water and the boronization time, that is, the second volume of desalted water is directly divided by the boronization time to obtain the second speed of introducing desalted water.

[0117] In this embodiment, the initial concentration value of the boric acid solution in the first loop of the reactor before the introduction of desalted water is determined, and the dilution concentration value of the boric acid solution when the desalted water is introduced for boration dilution is determined, and then the second volume of the desalted water during the boration process is determined based on the initial concentration value, the dilution concentration value and the loop volume of the first loop of the reactor, and then the second volume of the desalted water is divided by the boration time to obtain the second speed, which clarifies the introduction speed of the desalted water and the process of determining the introduction volume, ensures that the desalted water can be introduced at a certain speed to dilute the boric acid solution, effectively reduces the concentration of the boric acid solution, realizes the slow boration of the nuclear reactor, and thereby improves the accuracy of subsequent reactivity measurements.

[0118] In one embodiment, if Figure 6 As shown, in step S02, the dilution concentration value of the boric acid solution when the desalted water is introduced for boronization dilution is determined, which specifically includes the following steps:

[0119] S021: Determine the boration reactivity of introducing the boric acid solution for single boration within the boration time according to the first speed of introducing the boric acid solution, and determine the dilution reactivity of introducing the desalted water within the boration time according to the boration reactivity.

[0120] When determining the dilution concentration value of the boric acid solution when introducing desalted water for boration dilution, it is necessary to determine the boration reactivity of the boric acid solution introduced for single boration within the boration time according to the first speed of the introduction of the boric acid solution, and determine the dilution reactivity of the nuclear reactor within the boration time after the introduction of desalted water according to the boration reactivity. The dilution reactivity is the reactivity impact value of the introduction of the second volume of desalted water on the nuclear reactor. The first speed is the minimum pumping speed of the boric acid pump in the chemical volume system.

[0121] For example, the boric acid concentration value when the boric acid solution is introduced alone at a first speed (i.e., desalted water is not introduced), i.e., the initial boric acid concentration value, can be measured by a boric acid concentration meter; then the boron differential value corresponding to the initial boric acid concentration value is determined, and then the first volume, the first speed, and the boron differential value corresponding to the initial boric acid concentration value are multiplied to obtain the boration reactivity of the boric acid solution introduced during the boration time for boration alone, which is simple and convenient. Among them, the boron differential value is determined by the boron differential value data at different boric acid concentrations that are pre-calibrated.

[0122] After obtaining the boration reactivity of introducing boric acid solution for single boration within the boration time, the total demand reactivity of the nuclear reactor within the boration time during the boration dilution process is determined according to the demand measurement based on the value of the control rod. The total demand reactivity is greater than the value of the control rod. Then, the total demand reactivity is subtracted from the boration reactivity to obtain the dilution reactivity of introducing desalted water for dilution within the boration time.

[0123] The total demand reactivity may be a pre-calibrated reactivity value, and the total demand reactivity needs to be slightly greater than the reactivity value of the small value control rod to avoid the value of the small value control rod being instantly covered by the excessive total demand reactivity. In other embodiments, the total demand reactivity may also be calculated using a point reactor dynamics model based on relevant parameters of the nuclear reactor, which has higher accuracy.

[0124] S022: Based on the dilution reactivity, determine the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution.

[0125] After determining the dilution reactivity of the desalted water introduced during the boration time, the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boration dilution is determined according to the dilution reactivity of the desalted water.

[0126] In this embodiment, the boration reactivity of introducing a boric acid solution for separate boration within the boration time is determined based on the first speed, and the dilution reactivity of introducing desalted water is determined based on the boration reactivity. Then, based on the dilution reactivity, the dilution concentration value of the boric acid solution after introducing the desalted water into the first loop of the reactor for boration dilution is determined. The calculation process of the dilution concentration value of the boric acid solution is refined, and the dilution concentration value is inferred based on the dilution reactivity. This is simple and convenient, and has higher accuracy than the calibrated concentration. It can also reduce the time required to process the boric acid concentration value.

[0127] In one embodiment, step S021, i.e., determining the boration reactivity of introducing the boric acid solution for single boration within the boration time according to the first volume and the first speed, and determining the dilution reactivity of introducing the desalted water within the boration time according to the boration reactivity, specifically includes the following steps:

[0128] S0211: Determine the total required reactivity of a nuclear reactor during the boriding dilution process based on the control rod value measurement requirements during the boriding time.

[0129] According to the value measurement requirements of the control rods, the total demand reactivity of the nuclear reactor during the boriding time during the boriding dilution process is determined. The value measurement requirements of the control rods are to estimate the reactivity value of the control rods according to the type of the control rods being measured, and then the total demand reactivity of the nuclear reactor during the boriding time during the boriding process is estimated according to the reactivity value of the control rods. The total demand reactivity is greater than the value of the control rods. The total demand reactivity can be slightly greater than the reactivity value of the small-value control rods to avoid the value of the small-value control rods being instantly covered by the excessive total demand reactivity. In other embodiments, the total demand reactivity can also be calculated using a point reactor kinetic model based on the relevant parameters of the nuclear reactor, which is more accurate.

[0130] S0212: Based on the first volume and the first speed, predict a first reactive introduction speed for introducing the boric acid solution for a separate boration reaction, and multiply the first reactive introduction speed by the boration time to obtain the boration reactivity for introducing the boric acid solution for a separate boration reaction within the boration time.

[0131] After determining the first rate and the first volume of introducing the boric acid solution, a first reactive introduction rate for introducing the boric acid solution for a separate borylation reaction can be predicted based on the first rate and the first volume of the boric acid solution.

[0132] It is necessary to understand that the reactivity change of the boric acid solution to the nuclear reactor is affected by the introduction rate and concentration of the boric acid solution. The introduction of boric acid solutions of different concentrations per unit time causes different reactivity changes in the nuclear reactor, that is, the boron differential values ​​corresponding to boric acid solutions of different concentrations are different. Based on this, the first reactivity introduction rate of the boric acid solution for the single boration reaction can be determined according to the initial concentration value of the boric acid solution when desalted water is not introduced and the first introduction rate of the boric acid solution.

[0133] The initial concentration value of the boric acid solution before the desalted water is introduced can be measured by a boric acid concentration meter, and then the boron differential value corresponding to the initial concentration value can be determined in the pre-calibrated boron differential value data, and then the boron differential value corresponding to the initial concentration value can be multiplied by the first speed to obtain the first reactive introduction speed of introducing the boric acid solution for the single boration reaction. The boron differential value data is the boron differential value at different boric acid concentrations pre-calibrated according to the measured data of the nuclear reactor.

[0134] After obtaining the first reactive introduction rate of introducing the boric acid solution for the single borylation reaction, the first reactive introduction rate and the borylation time are multiplied to obtain the borylation reactivity of introducing the boric acid solution for the single borylation reaction within the borylation time.

[0135] Specifically, the first reactivity introduction rate is calculated by the following formula:

[0136]

[0137] in, It represents the first reactive introduction rate of the introduction of boric acid solution for the single borylation reaction; Indicates the differential value of boron corresponding to the initial concentration value; V SPEED硼酸 The first speed is the speed of introducing the boric acid solution. When the first speed is the minimum introduction speed of the boric acid pump, Represents the minimum reactive introduction rate for the introduction of boric acid solution for a single borylation reaction.

[0138] S0213: Subtract the boration reactivity from the total demand reactivity to obtain the dilution reactivity of the deionized water introduced for dilution during the boration time.

[0139] After obtaining the borylation reactivity of introducing boric acid solution within the borylation time to carry out a separate borylation reaction.

[0140] It should be understood that the theoretical reactivity value of the nuclear reactor during the boration time (i.e., the total required reactivity) when the boric acid solution and the desalted water are introduced simultaneously is: the difference between the first reactivity introduction rate of the boric acid solution and the second reactivity introduction rate of the desalted water, multiplied by the boration time, that is, the following formula exists:

[0141]

[0142] Where △ρ represents the theoretical reactivity of the nuclear reactor during the boronization time when the boric acid solution and desalted water are introduced simultaneously, i.e., the total required reactivity; is the first reactive introduction rate of the boric acid solution; represents the second reactive introduction rate of desalted water; n∑t 控制棒 represents the boronization time, where ∑t 控制棒 is the running time required for a single rod lifting operation, n is a preset multiple, n is greater than 1; the unit of each reactive introduction rate is pcm.

[0143] According to the above formula, the dilution reactivity of the deionized water introduced for dilution during the boration time can be inferred, and the dilution reactivity of the deionized water introduced for dilution during the boration time can be obtained by subtracting the boration reactivity from the total demand reactivity. That is, the dilution reactivity is calculated by the following formula:

[0144]

[0145] Among them, △ρ 水 is the dilution reactivity of the deionized water introduced for dilution during the boronization time; △ρ represents the total demand reactivity; is the first reactive introduction rate of boric acid solution; n∑t 控制棒 represents the boronization time, where ∑t 控制棒 It is the running time required for a single stick lifting operation, n is a preset multiple, n is greater than 1; It indicates the borylation reactivity of the borylation reaction carried out by introducing a boric acid solution within the borylation time.

[0146] In this embodiment, the total demand reactivity of the nuclear reactor during the boronization dilution process is determined according to the value measurement demand of the control rod, and the total demand reactivity is greater than the value of the control rod, and the first reactivity introduction speed of introducing the boric acid solution for a separate boronization reaction is predicted according to the first volume and the first speed, and the first reactivity introduction speed is multiplied by the boronization time to obtain the boronization reactivity of introducing the boric acid solution for a separate boronization reaction during the boronization time, and then the total demand reactivity is subtracted from the boronization reactivity to obtain the dilution reactivity of introducing desalted water for dilution during the boronization time. This process clarifies the specific process of introducing the dilution reactivity of desalted water during the boronization time, determines the boronization reactivity according to the reactivity introduction speed technology of boric acid, and then determines the dilution reactivity of desalted water, which is simple to calculate and highly accurate, and does not require complex test operations.

[0147] In one embodiment, step S022, i.e., determining the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution according to the dilution reactivity, specifically comprises the following steps:

[0148] S0221: Determine the boron differential value of the boric acid solution after diluting the boric acid solution by introducing deionized water.

[0149] After obtaining the dilution reactivity of the desalted water introduced within the boration time, the boron differential value of the boric acid solution after diluting the boric acid solution with the desalted water is determined, that is, the boron differential value corresponding to the concentration value of the boric acid solution after diluting the boric acid solution with the desalted water is determined.

[0150] Considering that the reactivity value of the small-value control rod is relatively small, usually around 100 pcm, the dilution of desalted water and the boronization of the control rod have little effect on the concentration of the boric acid solution in the first loop of the reactor. During the entire boronization time, the effect of dilution and boronization on the boron differential value is weak and negligible. Therefore, the boron differential value corresponding to the initial concentration value of the boric acid solution can be used as the boron differential value of the boric acid solution after the desalted water is introduced to dilute the boric acid solution. On the basis of ensuring accuracy, the data processing process is reduced.

[0151] In other embodiments, the boron differential value corresponding to the initial concentration value of the boric acid solution can be deducted from a pre-calibrated preset value as the boron differential value of the boric acid solution after the deionized water is introduced to dilute the boric acid solution. In addition, a calibration concentration value less than the initial concentration value can be determined as needed, and the boron differential value corresponding to the calibration concentration value can be determined in the pre-calibrated boron differential value data as the boron differential value of the boric acid solution after the deionized water is introduced to dilute the boric acid solution.

[0152] S0222: Determine the dilution concentration value of the boric acid solution based on the initial concentration value, dilution reactivity and boron differential value of the boric acid solution.

[0153] After determining the boron differential value of the boric acid solution after diluting the boric acid solution by introducing desalted water, the dilution concentration value of the boric acid solution is determined based on the initial concentration value of the boric acid solution, the dilution reactivity of the desalted water, and the boron differential value.

[0154] Among them, the dilution concentration value of the boric acid solution can be determined by the following formula:

[0155]

[0156] Among them, CB i It is expressed as the initial concentration of the boric acid solution when the desalted water is introduced; CB f It represents the dilution concentration of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution; △ρ 水 It indicates the dilution reactivity of the deionized water introduced for dilution during the boration time; It represents the differential value of boron in the boric acid solution after diluting the boric acid solution by introducing deionized water.

[0157] Then, the second volume of deionized water is calculated by the following formula:

[0158]

[0159] Among them, V 水 V represents the second volume, i.e. the volume of deionized water introduced during the boronization time; 回路 Indicates the loop volume of the first loop of the reactor; CB i It is expressed as the initial concentration of the boric acid solution when the desalted water is introduced; CB f It represents the dilution concentration of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution; △ρ 水 It indicates the dilution reactivity of the deionized water introduced for dilution during the boration time; It represents the differential value of boron in the boric acid solution after diluting the boric acid solution by introducing deionized water.

[0160] Then, the second rate of desalted water is calculated by the following formula:

[0161]

[0162] Among them, V SPEED水 V represents the second speed of desalted water, i.e. the speed of introducing desalted water into the first loop of the reactor; 水 represents the second volume, i.e. the volume of desalted water introduced during the boronization time; n∑t 控制棒 represents the boronization time, where ∑t 控制棒 It is the running time required for a single rod lifting operation, n is a preset multiple, and n is greater than 1.

[0163] In this embodiment, the boron differential value of the boric acid solution after diluting the boric acid solution by introducing desalted water is determined, and the dilution concentration value of the boric acid solution is determined based on the initial concentration value, dilution reactivity and boron differential value of the boric acid solution. Then, the second volume and the second speed of the desalted water are determined based on the initial concentration value and the dilution concentration value of the boric acid solution, thereby improving the accuracy of the second volume and the second speed of the desalted water.

[0164] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0165] In one embodiment, a control rod value measurement device is provided, and the control rod value measurement device corresponds one-to-one to the control rod value measurement method in the above embodiment. Figure 7 As shown, the control rod value measurement device includes a determination module 701 and a control module 702. Each functional module is described in detail as follows:

[0166] A determination module 701 is used to determine a boronization time for a nuclear reactor to perform a boronization reaction, where the boronization time is a preset multiple of the operation time required for a control rod to complete a single rod lifting operation, and the preset multiple is greater than 1;

[0167] The control module 702 is used to perform the following steps during the boronization time:

[0168] Introducing a first volume of boric acid solution into a first loop of a reactor at a first speed for boronization, and simultaneously introducing a second volume of demineralized water at a second speed for dilution;

[0169] The control rods of a single rod bundle in a nuclear reactor are controlled to be lifted, so as to measure the reactivity value of the control rods according to the change of the reactor reactivity during the rod lifting process.

[0170] Optionally, the determination module 701 may also be configured to determine the second speed in the following manner:

[0171] Determine the initial concentration of the boric acid solution in the first loop of the reactor before the introduction of desalted water;

[0172] Determine the dilution concentration value of the boric acid solution when introducing desalted water for dilution;

[0173] Determining a second volume of desalted water according to the initial concentration value, the dilution concentration value and the loop volume of the first loop of the reactor;

[0174] The second speed is determined based on the second volume of demineralized water and the boration time.

[0175] Optionally, the determining module 701 is further specifically configured to:

[0176] Determining the boration reactivity of introducing a boric acid solution for boration alone within the boration time according to the first speed, and determining the dilution reactivity of introducing desalted water according to the boration reactivity;

[0177] According to the dilution reactivity, the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution is determined.

[0178] Optionally, the determining module 701 is further specifically configured to:

[0179] According to the demand measurement of the value of the control rod, the total demand reactivity of the nuclear reactor during the boriding process is determined during the boriding time, and the total demand reactivity is greater than the value of the control rod;

[0180] Predicting a first reactivity introduction rate for introducing the boric acid solution for a single borylation reaction according to the first volume and the first rate, and multiplying the first reactivity introduction rate by the borylation time to obtain a borylation reactivity for introducing the boric acid solution for a single borylation reaction within the borylation time;

[0181] The total demand reactivity minus the boration reactivity gives the dilution reactivity for dilution with deionized water introduced during the boration time.

[0182] Optionally, the determining module 701 is further specifically configured to:

[0183] Determine the differential value of boron in the boric acid solution after diluting the boric acid solution by introducing deionized water;

[0184] The dilution concentration of the boric acid solution is determined based on the initial concentration, dilution reactivity and boron differential value of the boric acid solution.

[0185] Optionally, the control module 702 is specifically configured to:

[0186] Controlling the control rods of the single rod bundle to perform a rod lifting operation, and monitoring the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor, and obtaining the reactivity change data of the nuclear reactor;

[0187] The reactivity value of the control rods of a single rod cluster is determined based on the reactivity variation data.

[0188] Optionally, the control module 702 is specifically configured to:

[0189] The control rods of a single rod bundle are controlled by a segmented rod lifting method to perform multiple rod lifting operations, and the reactivity change of the nuclear reactor is monitored during each rod lifting process to obtain the reactivity change data when the control rods are lifted from the lowest position to the top of the nuclear reactor;

[0190] There is a preset time interval between two adjacent rod lifting operations, and the preset time is a pre-calibrated static time required for the nuclear reactor after the rod lifting.

[0191] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of the present application. Their specific functions and technical effects can be found in the method embodiment part and will not be repeated here.

[0192] The technicians in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In practical applications, the above-mentioned function allocation can be completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated in a processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, which will not be repeated here.

[0193] The present application also provides an electronic device, such as Figure 8 As shown, the electronic device 2 includes: at least one processor 20, a memory 21, and a computer program 22 stored in the memory 21 and executable on the at least one processor 20, wherein the processor 20 implements the steps in any of the above-mentioned method embodiments when executing the computer program 22, or implements the functions of each module / unit in the above-mentioned device embodiments when executing the computer program 22.

[0194] Exemplarily, the computer program 22 may be divided into one or more modules / units, which are stored in the memory 21 and executed by the processor 20 to complete the present application. The one or more modules / units may be a series of computer program instruction segments capable of completing specific functions, which are used to describe the execution process of the computer program 22 in the electronic device 2.

[0195] Those skilled in the art will understand that Figure 8 These are merely examples of the electronic device and do not constitute a limitation of the electronic device. The electronic device may include more or fewer components than those shown in the figure, or a combination of certain components, or different components. For example, the electronic device may also include input and output devices, network access devices, buses, etc.

[0196] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc.

[0197] The memory may be an internal storage unit of the electronic device, such as a hard disk or memory of the electronic device. The memory may also be an external storage device of the electronic device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the electronic device. Furthermore, the memory may also include both an internal storage unit of the electronic device and an external storage device.

[0198] An embodiment of the present application further provides a readable storage medium, wherein the readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in the above-mentioned method embodiments can be implemented.

[0199] An embodiment of the present application provides a computer program product. When the computer program product runs on a terminal device, the terminal device can implement the steps in the above-mentioned method embodiments when executing the computer program product.

[0200] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium can at least include: any entity or device that can carry the computer program code to the camera / terminal device, recording medium, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, RandomAccess Memory), electric carrier signal, telecommunication signal and software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electric carrier signals and telecommunication signals.

[0201] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0202] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0203] In the embodiments provided in the present application, it should be understood that the disclosed devices / equipment and methods can be implemented in other ways. For example, the device / equipment embodiments described above are merely schematic, for example, the division of the modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0204] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0205] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A control rod value measurement method, characterized in that: include: Determining a boronization time for a nuclear reactor to perform a boronization reaction, wherein the boronization time is a preset multiple of the operating time required for a control rod to complete a single rod lifting operation, and the preset multiple is greater than 1; The following steps are performed during the boronization time: Introducing a first volume of boric acid solution into a first loop of a reactor at a first speed for boronization, and simultaneously introducing a second volume of demineralized water at a second speed for dilution; The control rods of the single rod bundle in the nuclear reactor are controlled to be lifted, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process.

2. The method according to claim 1, characterized in that The second speed is determined by: Determining an initial concentration value of the boric acid solution in the first loop of the reactor before the desalted water is introduced; Determining the dilution concentration value of the boric acid solution when the desalted water is introduced for dilution; Determining the second volume of the desalted water according to the initial concentration value, the dilution concentration value and the loop volume of the first loop of the reactor; The second volume of the demineralized water is divided by the boronization time to obtain the second rate.

3. The method according to claim 2, characterized in that The step of determining the dilution concentration value of the boric acid solution when the desalted water is introduced for dilution comprises: Determining, based on the first speed, a boration reactivity of introducing the boric acid solution for boration alone within the boration time, and determining, based on the boration reactivity, a dilution reactivity of introducing the desalted water; According to the dilution reactivity, the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution is determined.

4. The method according to claim 3, characterized in that The step of determining the boration reactivity of the boric acid solution introduced for boration alone within the boration time according to the first speed, and determining the dilution reactivity of the desalted water introduced according to the boration reactivity, comprises: determining a total demand reactivity of the nuclear reactor during the boriding process during the boriding time according to a value measurement demand of the control rod, the total demand reactivity being greater than the value of the control rod; predicting a first reactivity introduction rate of introducing the boric acid solution for a single boration reaction according to the first volume and the first rate, and multiplying the first reactivity introduction rate by the boration time to obtain a boration reactivity of introducing the boric acid solution for a single boration reaction within the boration time; The total demand reactivity is subtracted from the boration reactivity to obtain the dilution reactivity for dilution introduced into the deionized water during the boration time.

5. The method according to claim 3, characterized in that Determining the dilution concentration value of the boric acid solution after the desalted water is introduced into the first loop of the reactor for boronization dilution according to the dilution reactivity includes: Determining the boron differential value of the boric acid solution after diluting the boric acid solution by introducing the deionized water; The dilution concentration value of the boric acid solution is determined according to the initial concentration value of the boric acid solution, the dilution reactivity and the boron differential value.

6. The method according to any one of claims 1 to 5, characterized in that: The controlling the control rod of the single rod bundle in the nuclear reactor to lift the control rod, so as to measure the reactivity value of the control rod according to the reactivity change of the reactor during the rod lifting process, comprises: Controlling the control rods of the single rod bundle to perform a rod lifting operation, and monitoring the reactivity change of the nuclear reactor when the control rods are lifted from the lowest position to the top of the nuclear reactor, to obtain reactivity change data of the nuclear reactor; A reactivity value of the control rods of a single rod cluster is determined based on the reactivity change data.

7. The method according to claim 6, characterized in that The control rod of the control single rod bundle is operated to be lifted, and the reactivity change of the nuclear reactor is monitored when the control rod is lifted from the lowest position to the top of the nuclear reactor, and the reactivity change data of the nuclear reactor is obtained, including: The control rods of the single rod bundle are controlled by a segmented rod lifting method to perform multiple rod lifting operations, and the reactivity change of the nuclear reactor is monitored during each rod lifting process to obtain the reactivity change data when the control rods are lifted from the lowest position to the top of the nuclear reactor; There is a preset time interval between two adjacent rod lifting operations, and the preset time is a pre-calibrated static time required for the nuclear reactor after the rod lifting.

8. A control rod value measurement system, characterized in that: The invention comprises a control rod and a control rod value measuring device, wherein the control rod value measuring device is used for: Determining a boronization time for a nuclear reactor to perform a boronization reaction, wherein the boronization time is a preset multiple of the operating time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1; The following steps are performed during the boronization time: Introducing a first volume of boric acid solution into the first loop of the reactor at a minimum pumping speed of the boric acid pump for boronization, and simultaneously introducing a second volume of demineralized water at a second speed for dilution; The control rods of the single rod bundle in the nuclear reactor are controlled to be lifted, so as to measure the reactivity value of the control rods according to the reactivity change of the reactor during the rod lifting process.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the control rod value measurement method according to any one of claims 1 to 6 are implemented.

10. A readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the control rod value measurement method according to any one of claims 1 to 6 are implemented.

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