Methods, systems, equipment and storage media for measuring the value of control rods

Abstract

This application provides a method, system, device, and storage medium for measuring the value of control rods. The method includes: determining the boronizing time for a boronizing reaction in a nuclear reactor, wherein the boronizing time is a preset multiple of the operating time required for a single control rod lifting operation, and the preset multiple is greater than 1; within the boronizing time, performing the following steps: introducing a first volume of boric acid solution into the reactor's first loop at a first rate for boronizing, and simultaneously introducing a second volume of demineralized water at a second rate for dilution; controlling the lifting of control rods in a single rod bundle, and measuring the reactivity value of the control rods based on the reactor's reactivity changes during the lifting process. This embodiment enables slow boronizing, effectively lengthening the boronizing time and reducing the proportion of control rod lifting time, effectively reducing the influence of spatial effects during lifting, and reducing the possibility of inaccurate reactivity measurements due to excessively rapid reactivity changes during lifting, thereby improving the accuracy of control rod value measurement.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant control technology, and in particular to a method, system, device and storage medium for measuring the value of control rods. Background Technology

[0002] During the operation of a nuclear reactor, the insertion of control rods causes changes in neutron flux. Therefore, before and after the transient of the insertion and removal of asymmetric control rods, the measured reactivity deviates from the actual overall reactivity of the reactor core. This phenomenon is called the spatial effect of reactivity measurement.

[0003] In the process of measuring the value of small value control rods in a single rod bundle, the value of a single small value control rod is easily covered by a small amount of boronizing or dilution, causing a sudden change in the reactivity of the nuclear reactor. The spatial effect of reactivity measurement is aggravated, making it impossible to accurately measure the reactivity changes caused by the insertion and removal of small value control rods, resulting in low accuracy in the value measurement of small value control rods. Summary of the Invention

[0004] This invention provides a method, system, device, and storage medium for measuring the value of control rods, in order to solve the problem that existing methods for measuring the value of control rods cannot accurately measure the reactive changes caused by the insertion and removal of the rod, resulting in low accuracy in measuring the value of small-value control rods.

[0005] In a first aspect, embodiments of this application provide a method for measuring the value of a control rod, including:

[0006] The boronizing time for the boronizing reaction in the nuclear reactor is determined. The boronizing 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.

[0007] The following steps are performed during the boronizing time:

[0008] A first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boration, and simultaneously a second volume of demineralized water is introduced at a second rate for dilution.

[0009] The control rods of a single rod bundle in a nuclear reactor are lifted to measure the reactivity value of the control rods based on the changes in reactor reactivity during the lifting process.

[0010] Optionally, the second speed is determined as follows:

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

[0012] Determine the dilution concentration of the boric acid solution when introducing demineralized water;

[0013] The second volume of demineralized water is determined based on the initial concentration value, the dilution concentration value, and the loop volume of the reactor's first loop.

[0014] Divide the second volume of demineralized water by the boration time to obtain the second velocity.

[0015] Optionally, determining the dilution concentration of the boric acid solution when diluting with demineralized water includes:

[0016] Based on the first velocity, determine the boration reactivity of introducing boric acid solution for separate boration within the boration time, and determine the dilution reactivity of introducing demineralized water based on the boration reactivity;

[0017] Based on the dilution reactivity, the dilution concentration of the boric acid solution after boration dilution by introducing demineralized water into the reactor's first loop is determined.

[0018] Optionally, based on the first velocity, the boration reactivity of introducing boric acid solution for separate boration within the boration time is determined, and the dilution reactivity of introducing demineralized water is determined based on the boration reactivity, including:

[0019] Based on the value measurement requirements of the control rods, the total required reactivity of the nuclear reactor during the boronizing process is determined, and the total required reactivity is greater than the value of the control rods.

[0020] Based on the first volume and the first velocity, the first reactivity introduction rate of the boric acid solution for a separate borination reaction is predicted, and the first reactivity introduction rate is multiplied by the borination time to obtain the borination reactivity of the boric acid solution for a separate borination reaction within the borination time.

[0021] Subtracting the boronizing reactivity from the total demand reactivity yields the dilution reactivity, which is obtained by introducing demineralized water for dilution during the boronizing time.

[0022] Optionally, based on dilution reactivity, the dilution concentration of the boric acid solution after boration dilution by introducing demineralized water into the reactor's first loop is determined, including:

[0023] Determine the differential boron value of the boric acid solution after dilution with demineralized water;

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

[0025] Optionally, the control rods of a single-rod bundle in the nuclear reactor are lifted to measure the reactivity value of the control rods based on the changes in reactor reactivity during the lifting process, including:

[0026] The control rods of the single-rod bundle are raised, and the reactivity of the nuclear reactor is monitored as the control rods are raised from the lowest position to the top of the nuclear reactor to obtain data on the reactivity changes of the nuclear reactor.

[0027] The reactivity value of the control rods in a single rod bundle is determined based on reactivity change data.

[0028] Optionally, the control rods of the single-rod bundle are controlled to perform a rod-lifting operation, and the reactivity changes of the nuclear reactor are monitored as the control rods are lifted from the lowest position to the top of the nuclear reactor, obtaining nuclear reactor reactivity change data, including:

[0029] The segmented rod lifting method was used to control the control rods of a single rod bundle to perform multiple rod lifting operations, and the reactivity changes of the nuclear reactor were monitored during each rod lifting process to obtain reactivity change data when the control rods were lifted from the lowest position of the nuclear reactor to the top.

[0030] The interval between two adjacent rod lifting operations is a preset time, which is the settling time required by the nuclear reactor after the rod lifting is pre-defined.

[0031] Secondly, embodiments of this application provide a control rod value measurement system, including a control rod and a control rod value measuring device, the control rod value measuring device being used for:

[0032] The boronizing time for the boronizing reaction in the nuclear reactor is determined. The boronizing 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.

[0033] The following steps are performed during the boronizing time:

[0034] A first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boration, and simultaneously a second volume of demineralized water is introduced at a second rate for dilution.

[0035] The control rods of a single rod bundle in a nuclear reactor are lifted to measure the reactivity value of the control rods based on the changes in reactor reactivity during the lifting process.

[0036] Thirdly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the above-described control rod value measurement method.

[0037] Fourthly, embodiments of this application provide a readable storage medium storing a computer program that, when executed by a processor, implements the steps of the above-described control rod value measurement method.

[0038] In one scheme provided by the aforementioned control rod value measurement method, system, equipment, and storage medium, the boronizing time for the boronizing reaction in the nuclear reactor is determined. The boronizing 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. During the boronizing time, the following steps are performed: a first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boronizing, and simultaneously a second volume of demineralized water is introduced at a second rate for dilution; the control rods in the single rod bundle in the nuclear reactor are lifted, and the reactivity value of the control rod is measured based on the reactivity changes of the reactor during the lifting process. In this embodiment, the boronizing time is defined as the time for a single control rod lift at a preset multiple. A first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boronizing, while a second volume of demineralized water is introduced simultaneously at a second rate for dilution. This reduces the average boron concentration in the loop liquid, achieving slow boronizing. This effectively lengthens the boronizing time and reduces the proportion of the control rod lift time in the total boronizing time. It also effectively reduces the spatial effect during lift and minimizes the possibility of inaccurate reactivity measurements due to rapid reactivity changes during lift, thereby improving the accuracy of control rod value measurement. Attached Figure Description

[0039] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of a control rod value measurement system according to an embodiment of the present invention;

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

[0042] Figure 3 This is a flowchart illustrating a method for measuring the value of a control rod according to an embodiment of the present invention;

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

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

[0045] Figure 6 yes Figure 5 A schematic diagram of the implementation process of step S02;

[0046] Figure 7yes Figure 1 or Figure 2 A schematic diagram of a control bar value measurement device;

[0047] Figure 8 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] It should be understood that, when used in this 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 collections thereof. It should also be understood that, as used in this specification and the appended claims, the term "and / or" refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0050] Furthermore, in the description of this invention and the appended claims, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of the invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0052] It should be understood that the sequence number of each step in the following embodiments does not imply 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 embodiments of the present invention.

[0053] To illustrate the technical solution of the present invention, specific embodiments are described below.

[0054] It is important to understand that control rod value measurement is a crucial aspect of the initial physics testing and verification of a nuclear reactor. This is typically achieved by measuring changes in reactor reactivity during control rod insertion or removal using detectors in the nuclear instrumentation system. These detectors are located outside the reactor. During reactor operation, changes in the position of asymmetric control rods, such as during single-rod insertion or removal, induce axial and radial disturbances in the reactor. This results in an asymmetric distribution of the neutron flux density, leading to uneven asymmetric neutron flux changes. Consequently, the reactivity data measured by the detectors before and after the rod insertion / removal transients deviate from the actual reactivity of the reactor; this is known as the spatial effect in reactor reactivity measurement.

[0055] Low-value control rods (LVCs) have a minimal impact on reactor reactivity changes, and their reactivity control remains relatively stable throughout the reactor's lifetime. Traditional methods for measuring the value of LVCs typically involve boration or dilution. However, because the borate concentration in the borate tank of a traditional nuclear reactor's chemical and volume control system (CVCS) is high, and the value of a single LVC is small, only a small amount of boration or demineralized water dilution is needed to fully cover its reactivity value. This boration or dilution process is short, and the reactor's reactivity changes too rapidly to accurately measure the reactivity changes during rod lifting or insertion. Furthermore, due to limitations in the control rod lifting / insertion rate during power operations, the time required for a LVC to complete the lifting / insertion action is a longer proportion of its boration or dilution time. This makes the measured reactivity changes more significantly affected by space effects, leading to a further deviation of the measured reactivity from the actual reactivity, thus causing bias in the measurement of control rod reactivity value.

[0056] Considering the above factors, compared with the value measurement process of symmetrical rod lifting and large value control rods, the nonlinear reactivity of the nuclear reactor accounts for a larger proportion in the value measurement process of small value control rods, and is significantly affected by space effects. At this time, the reactivity data measured by the detector cannot truly reflect the real 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 in this invention can be applied to, for example... Figure 1 The control rod value measurement system shown includes control rods and a control rod value measuring device. The control rods are pre-inserted into the nuclear reactor. The control rod value measuring device controls the control rods by determining their structure. In this embodiment, the control rods are low-value control rods, such as gray rods.

[0058] The control rod value measurement device is used to: determine the boronizing time for the boronizing reaction in the nuclear reactor, wherein the boronizing 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; and perform the following steps within the boronizing time: introduce a first volume of boric acid solution into the reactor's first loop at a first rate for boronizing, and control the chemical and volumetric system to simultaneously introduce a second volume of demineralized water at a second rate for boronizing dilution; at the same time, it is also necessary to control the lifting of the control rods in the single rod bundle in the nuclear reactor, so as to measure the reactivity value of the control rod based on the reactivity changes of the reactor during the lifting process.

[0059] In this embodiment, the boronizing time is defined as the time for a single control rod lift at a preset multiple. A first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boronizing, while a second volume of demineralized water is introduced simultaneously at a second rate for dilution. This reduces the average boron concentration in the loop liquid, achieving slow boronizing. This effectively lengthens the boronizing time and reduces the proportion of the control rod lift time in the total boronizing time. It also effectively reduces the impact of the reactivity space effect during control rod lift and minimizes the possibility of inaccurate reactivity measurements due to rapid reactivity changes during lift, thereby improving the accuracy of 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. This is merely an illustrative example. In one embodiment, such as... Figure 2 As shown, the control rod value measurement system also includes the reactor's capacity system. The control rod value measurement device communicates with the capacity system via a network or cable. The capacity system includes a boric acid pump and a demineralized water pump. Specifically, the control rod value measurement device is used to: determine the boration time for the reactor to perform the boration reaction, where the boration time is a preset multiple of the operating time required for a single rod lifting operation, and the preset multiple is greater than 1; within the boration time, perform the following steps: control the boric acid pump of the capacity system to introduce a first volume of boric acid solution into the reactor's first loop at a first speed for boration, and simultaneously control the demineralized water pump of the capacity system to introduce a second volume of demineralized water at a second speed for boration dilution; simultaneously, it is also necessary to control the lifting of control rods in a single rod bundle in the reactor to measure the reactivity value of the control rod based on the reactor's reactivity changes during the lifting process.

[0061] In other embodiments, the control rod value measurement system also includes other necessary devices for the nuclear reactor, such as borate concentration meters, detectors for measuring reactivity, and other sensors, which will not be described in detail here.

[0062] In this embodiment, the control rod value measurement system can be a nuclear reactor control system, and the control rod value measurement device can be an electronic control unit. In other embodiments, the control rod value measurement device can be a terminal device or a server; the terminal device includes, but is not limited to, various personal computers, laptops, smartphones, tablets, and portable wearable devices; the server can be implemented using a standalone server or a server cluster consisting of multiple servers.

[0063] In one embodiment, such as Figure 3 As shown, a method for measuring the value of a control rod is provided, which is then applied to... Figure 1 The following steps are used as an example of a control bar value measurement device:

[0064] S10: Determine the boronizing time for the boronizing reaction in the nuclear reactor. The boronizing 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.

[0065] When measuring the value of a low-value control rod, the control rod value measuring device needs to first determine the boronizing time for the nuclear reactor to carry out the boronizing reaction. The boronizing 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 time required for the control rod to complete a single lifting operation can be a calibrated empirical value or a value determined based on the control rod's operational data. The time required for the control rod to complete a single lifting operation is calculated by multiplying the number of steps the control rod travels by the movement rate, where the movement rate is n steps per minute.

[0067] The boronizing 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 can be 2-3 times, that is, the boronizing time is 2-3 times the operating time required for the control rod to complete a single rod lifting operation. This can both extend the boronizing time to a certain extent and reduce the nuclear wastewater generated by the boronizing reaction.

[0068] For example, limited by the current control rod lifting rate, the travel distance of the control rods in existing second- and third-generation pressurized water reactors in China is generally 5-225 steps, totaling 220 steps. Assuming a lifting or insertion rate of 48 steps / minute, the complete data processing time for a single control rod lifting or insertion operation is approximately 4.58 minutes. Therefore, the operating time required for a single control rod lifting operation can be 4.58 minutes, or slightly longer, such as 5 minutes. The boronizing time for a single operation is 2-3 times the operating time required for a single control rod lifting operation, meaning the boronizing time for a single operation can be 10-15 minutes.

[0069] S20: During the boronizing time, the following steps are performed: a first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boronizing, and a second volume of demineralized water is introduced simultaneously at a second rate for dilution; the control rods of the single-rod bundle in the nuclear reactor are lifted, and the reactivity value of the control rods is measured based on the reactor's reactivity changes during the lifting process.

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

[0071] Specifically, after determining the borylation time for the borylation reaction in the nuclear reactor, the control rod value measurement device performs the following steps within the borylation time:

[0072] The control rod value measurement device controls the boric acid pump of the chemical capacity system to introduce a first volume of boric acid solution into the reactor first loop at a first speed for boration, and simultaneously controls the demineralized water pump of the chemical capacity system to introduce a second volume of demineralized water at a second speed for boration dilution. This can introduce nuclear reactor reactivity at a certain rate and reduce the rate of reactivity change.

[0073] The control rod value measurement device controls the lifting of control rods in a single rod bundle in a nuclear reactor to measure the reactivity value of the control rods based on the changes in reactor reactivity during the lifting process.

[0074] It is important to understand that, due to the minimum flow rate of boric acid pumps (such as boric acid pumps) in nuclear power plant chemical capacity systems and the high concentration of boric acid in boric acid tanks, boration operations need to be carried out at a certain flow rate and a certain boron concentration. The rate of negative reactivity introduction is relatively high, and the reactivity of simple boration methods cannot meet the requirements for slow reactivity introduction. In this embodiment, a boration plus dilution method is used. While introducing a first volume of boric acid solution at a first rate for the boration reaction, a second volume of demineralized water is simultaneously introduced at a second rate. This changes the boron-water ratio in the reactor's primary loop, thereby reducing the average boron concentration of the liquid entering the reactor's primary loop. This concentration is lower than the boric acid concentration in the boric acid tank but slightly higher than the primary loop boron concentration, thus achieving slow boration.

[0075] The initial velocity for introducing boric acid solution can be calibrated according to user requirements; that is, the initial velocity can be a calibrated velocity. The initial velocity can be the minimum pumping velocity achievable by the boric acid pump in the chemical reaction system, or a velocity close to the minimum pumping velocity. Specifically, the difference between the initial velocity and the minimum pumping velocity achievable by the boric acid pump should be greater than or equal to 0 and less than 10% of the minimum pumping velocity. Pumping the boric acid solution at a velocity close to the minimum pumping velocity of the boric acid pump can further prolong the boration time and reduce the rate of introduction of nuclear reactor reactivity. After determining the initial velocity, the initial volume of boric acid solution introduced can be determined based on the initial velocity and the boration reaction; the initial volume is the product of the initial velocity and the boration reaction.

[0076] The second velocity is determined based on the first velocity, and increases with the increase of the first velocity to ensure that the demineralized water is sufficient to dilute the boric acid solution, achieving slow boration and reducing the rate of change in the nuclear reactor's reactivity. Specifically, the total required reactivity of the nuclear reactor during boration dilution within the boration time can be predetermined. This total required reactivity is determined based on the reactivity value of the small-value control rods. The total required reactivity needs to be slightly greater than the reactivity value of the small-value control rods to avoid the total required reactivity being too large and momentarily overriding the value of the small-value control rods. The second volume of demineralized water introduced can be determined based on the first volume and first velocity of the boric acid solution, as well as the total required reactivity of the nuclear reactor during boration dilution within the boration time. Dividing the second volume by the boration time yields the second velocity of the introduced demineralized water, ensuring that the second velocity increases with the increase of the first velocity. This ensures that after introducing the first volume of boric acid solution and the second volume of demineralized water, the change in the nuclear reactor's reactivity remains within the required range, thus meeting the value measurement requirements of the small-value control rods.

[0077] In this embodiment, a first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boration, while a second volume of demineralized water is introduced simultaneously at a second rate for dilution. This reduces the average boron concentration in the loop, achieving slow boration. On one hand, by employing a boration and dilution method to measure the value of low-value control rods, the boration time is extended, reducing the rate of reactivity change in the nuclear reactor. This reduces the impact of the reactivity space effect and minimizes the possibility of reactivity rapidly overriding the reactivity value of the control rod, thus improving the accuracy of value measurement. On the other hand, using a preset multiple of the control rod's single lifting time as the boration time further extends the boration time, thereby further improving the accuracy of value measurement. By effectively extending the boration time, the proportion of the control rod lifting time in the total boration time is reduced, effectively mitigating the impact of the reactivity space effect during control rod lifting and reducing the possibility of inaccurate reactivity measurement due to excessively rapid reactivity changes during lifting, thereby improving the accuracy of control rod value measurement.

[0078] Furthermore, the control rod value measurement method provided by the embodiments of the present invention can effectively reduce the borosilicate and dilution rate of the nuclear reactor while keeping the chemical capacity system structure of the nuclear power plant unchanged. This enables a more stable introduction of reactivity during the measurement of the value of a single small-value control rod, improves the accuracy of reactivity measurement, and also alleviates the space 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 rate and a second volume of demineralized water at a second rate, 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 the single rod bundle in the nuclear reactor are controlled to lift the rods, which can avoid the safety risks caused by excessively low reactivity of the nuclear reactor.

[0080] In one embodiment, such as Figure 4 As shown, step S20, which involves controlling the lifting of the control rods in the single-rod bundle of the nuclear reactor to measure the reactivity value of the control rods based on the changes in reactor reactivity during the lifting process, specifically includes the following steps:

[0081] S21: Control the control rods of the single rod bundle to perform rod lifting operations, and monitor the reactivity changes of the nuclear reactor as the control rods are lifted from the lowest position to the top of the nuclear reactor, thereby obtaining data on the reactivity changes of the nuclear reactor.

[0082] After determining the boronizing time for the boronizing reaction in the nuclear reactor, the control rod value measurement device needs to control the control rods of the single rod bundle to perform a rod lifting operation within the boronizing time. The device also monitors the reactivity changes of the nuclear reactor as the control rods are lifted from the lowest position to the top of the nuclear reactor using detectors in the nuclear instrumentation system (such as power range probes). This process obtains data on the reactivity changes of the nuclear reactor, and then the reactivity value of the control rods of the single rod bundle is determined based on the reactivity change data.

[0083] In this process, after determining the boronizing time for the nuclear reactor to undergo the boronizing reaction, the control rod value measuring device controls the control rods of the single rod bundle to perform a one-time rod lifting operation within the boronizing time. That is, when the control rods of the single rod bundle are lifted from the lowest position of the nuclear reactor to the top in one go, the reactivity change of the nuclear reactor during this one-time rod lifting process is recorded, and the reactivity change data when the control rods are lifted from the lowest position of the nuclear reactor to the top is obtained.

[0084] S22: Determine the reactivity value of the control rods in a single rod bundle based on reactivity change data.

[0085] After obtaining the reactivity change data of the nuclear reactor, the value of the control rods is calculated based on this data to obtain the reactivity value of the control rods in a single rod bundle.

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

[0087] In this embodiment, the control rods of the single-rod bundle are raised, and the reactivity of the nuclear reactor is monitored as the control rods are raised from the lowest position to the top. Data on the reactivity changes in the nuclear reactor is obtained, and the reactivity value of the control rods in the single-rod bundle is determined based on this data. This clarifies the measurement process of the control rod's reactivity value. By monitoring the reactivity changes in the nuclear reactor as the control rods are raised from the lowest position to the top, data on the reactivity changes in the nuclear reactor are obtained, and the reactivity value of the control rods in the single-rod bundle is determined. This method is simple and intuitive, ensuring the accuracy of the control rod value measurement.

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

[0089] S211: 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 changes of the nuclear reactor are monitored during each rod lifting process to obtain reactivity change data when the control rod is lifted from the lowest position of the nuclear reactor to the top.

[0090] The interval between two consecutive rod lifting operations is a preset time, which is the pre-defined settling time required for the nuclear reactor after rod lifting. This preset time can be 15 minutes. That is, when using the segmented rod lifting method to control the control rods of a single rod bundle for multiple lifting operations, a 15-minute wait is required after each lifting operation before the next lifting operation can be performed, until the control rod is completely lifted to the top. Waiting for the preset time between each lifting operation allows the nuclear reactor to settle sufficiently, allowing its static space effect to decay over time before the lifting process, resulting in more accurate reactivity data.

[0091] Specifically, after determining the boronizing time for the boronizing reaction in the nuclear reactor, the control rod value measurement device can control the control rods of a single rod bundle to perform multiple rod lifting operations within a single boronizing time, and monitor the reactivity changes of the nuclear reactor during each lifting process, obtaining reactivity change data when the control rod is lifted from the lowest position to the top of the nuclear reactor. A preset time interval is required between two adjacent rod lifting operations, and the single boronizing time must be greater than the sum of the preset time and the running time required for a single rod lifting operation to ensure that multiple rod lifting operations are performed within a single boronizing time.

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

[0093] S2111: The control rod of the single rod bundle is lifted for the first time to lift the control rod from the lowest position of the nuclear reactor to the first preset position (or lift the control rod from the lowest position of the nuclear reactor to the preset duration), and the reactivity change of the nuclear reactor is recorded during the process to obtain the first reactivity change data.

[0094] S2112: Timing reaches the preset time, the control rod of the single rod bundle is controlled to perform the Nth rod lifting operation to lift the control rod from the current position of the nuclear reactor to the second preset position (or lift the control rod from the current position of the nuclear reactor to the preset time), and the reactivity change of the nuclear reactor during this process is recorded to obtain the Nth reactivity change data, until the rod is lifted to the top, and the reactivity change data when the control rod is lifted from the lowest position of the nuclear reactor to the top is summarized. The reactivity change data includes the first reactivity change data and the Nth reactivity change data, where N is an integer greater than 1.

[0095] It's important to understand that the space effects caused by inserting or removing control rods fall into two categories: static space effects induced by prompt neutrons and dynamic space effects induced by delayed neutrons. Static space effects are caused by the instantaneous changes in prompt neutron flux. When control rods are inserted or removed, the prompt neutron flux density in the nuclear reactor changes, altering its distribution shape within a very short time. Dynamic space effects are caused by changes in the delayed neutron flux density distribution shape. Due to the longer decay time of delayed neutron precursor nuclei, it typically takes several minutes, usually more than ten minutes, for the delayed seed distribution shape to reach a stable state after control rod insertion or removal.

[0096] When measuring control rod value, extending the boronizing time can correct for the influence of dynamic space effects, thereby improving the accuracy of reactivity measurements. Static space effects are caused by transient neutrons within the reactor core, which constitute the majority of the reactor's neutron composition. The distribution of transient neutrons is related to the core's physical characteristics. During control rod value recording, changes in transient neutrons primarily arise from the lifting and lowering of control rods. This embodiment, based on reactivity at a certain rate, uses multiple rod lifting operations to control rod value. This process is equivalent to performing multiple initial-final state value analyses, reducing the amount of transient neutron change during each rod lifting, overcoming the influence of static space effects, and further improving the accuracy of reactivity measurements.

[0097] In this embodiment, a segmented lifting method is used to control the control rods of a single rod bundle through multiple lifting operations. The reactivity changes of the nuclear reactor are monitored during each lifting operation, obtaining reactivity change data as the control rod is lifted from the lowest position to the top of the nuclear reactor. The interval between two adjacent lifting operations is a preset time, which is the pre-calibrated settling time required for the nuclear reactor after lifting. This clarifies the specific process of control rod lifting and nuclear reactor reactivity change data. Multiple lifting operations reduce the influence of static space effects, further improving the accuracy of reactivity measurement, thereby improving the accuracy of control rod value measurement.

[0098] In other embodiments, the segmented lifting method is used to control the control rods of a single rod bundle to perform multiple lifting operations. Alternatively, the multiple lifting operations of the control rods of a single rod bundle can be completed separately within multiple boronizing times. One lifting operation is performed within a single boronizing time to lift the rod a certain distance, until the control rod is lifted segment by segment from the bottom to the top of the nuclear reactor over multiple boronizing times. A preset time interval is maintained between two adjacent lifting operations, i.e., a preset time interval is required between two adjacent boronizing times.

[0099] Specifically, after determining the boronizing time for the boronizing reaction in the nuclear reactor, 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 changes of the nuclear reactor are monitored during each rod-lifting process. The reactivity change data when the control rod is lifted from the lowest position of the nuclear reactor to the top is obtained, including the following steps:

[0100] S201: During the boronizing time, the following steps are performed: a first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boronizing, and simultaneously a second volume of demineralized water is introduced at a second rate for dilution; the control rods of the single-rod bundle are controlled to perform the first rod lifting operation 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 duration), and the reactivity changes of the nuclear reactor during this process are recorded to obtain the first reactivity change data;

[0101] S202: Timing reaches the preset time. During the boronization time, the following steps are performed: a first volume of boric acid solution is introduced into the reactor's first loop at a first speed for boronization, and simultaneously a second volume of demineralized water is introduced at a second speed for dilution; the control rod of the single rod bundle is controlled to perform the Nth rod lifting operation to lift the control rod from the current position of the nuclear reactor to the second preset position (or lift the control rod from the current position of the nuclear reactor to a preset time), and the reactivity change of the nuclear reactor during this process is recorded to obtain the Nth reactivity change data, until the rod is lifted to the top and then stopped. The reactivity change data when the control rod is lifted from the lowest position of the nuclear reactor to the top is then summarized.

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

[0103] In this embodiment, the multiple rod lifting operations of the control rod are completed in multiple boronizing time periods. No boronizing reaction is required within the preset time interval between adjacent rod lifting operations, thereby reducing the nuclear wastewater generated by the boronizing reaction.

[0104] In one embodiment, before introducing a first volume of boric acid solution into the reactor's first loop at a first rate for boration, and simultaneously introducing a second volume of demineralized water at a second rate for dilution, the first rate needs to be predetermined, and the second rate needs to be determined based on the first rate. For example... Figure 5 As shown, before step S20, i.e., during the boration time, the following steps are performed: introducing a first volume of boric acid solution into the reactor's first loop at a first rate for boration, and simultaneously introducing a second volume of demineralized water at a second rate for dilution; controlling the lifting of control rods in the single-rod bundle in the nuclear reactor, and measuring the reactivity value of the control rods based on the reactor's reactivity changes during the lifting process, the method further includes the following steps:

[0105] S01: Determine the initial concentration of boric acid solution in the reactor's first loop before the introduction of demineralized water.

[0106] First, the initial concentration of the boric acid solution in the reactor's first loop needs to be determined. This initial concentration is the concentration of the boric acid solution introduced at the first rate before the introduction of demineralized water. This can be the minimum boric acid concentration allowed by the boric acid pump.

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

[0108] After determining the initial concentration of the boric acid solution, it is necessary to determine the diluted concentration of the boric acid solution when introducing demineralized water to dilute the boric acid solution in the reactor's first loop. This diluted concentration is less than the initial concentration. This diluted concentration can be a pre-determined calibration concentration. In other embodiments, this diluted concentration can be a more accurate time-varying boric acid concentration measured when a first volume of boric acid solution is introduced at a first rate and a second volume of demineralized water is introduced at a second rate.

[0109] S03: Determine the second volume of demineralized water during the boration process based on the initial concentration value, the dilution concentration value, and the loop volume of the reactor's first loop.

[0110] After determining the dilution concentration and initial concentration of the boric acid solution, the second volume of the demineralized water is determined based on the initial concentration, the dilution concentration, and the loop volume (i.e., the liquid containment volume) of the reactor's first loop.

[0111] Specifically, the second volume of the demineralized water is calculated using the following formula:

[0112]

[0113] Among them, V 水 V represents the second volume, i.e., the volume of demineralized water introduced; 回路 Indicates the loop volume of the reactor's primary loop; CB i This indicates the initial concentration of boric acid solution in the reactor's primary loop before the introduction of demineralized water; CB f This indicates the dilution concentration of the boric acid solution when demineralized water is introduced for boration dilution; the unit for each volume is m³. 3 The unit for each concentration value is m. 3 / h.

[0114] In this embodiment, the calculation method of the second volume is only an illustrative example. In other embodiments, the second volume can also be determined in other ways, which will not be described in detail here.

[0115] S04: Divide the second volume of demineralized water by the boration time to obtain the second velocity.

[0116] After determining the second volume of the demineralized water, the second velocity is determined based on the second volume of the demineralized water and the boration time. That is, the second volume of the demineralized water is directly divided by the boration time to obtain the second velocity of introducing the demineralized water.

[0117] In this embodiment, the initial concentration of boric acid solution in the reactor's first loop before the introduction of demineralized water is determined, and the dilution concentration of boric acid solution when demineralized water is introduced for boration dilution is also determined. Then, based on the initial concentration, dilution concentration, and loop volume of the reactor's first loop, the second volume of demineralized water during the boration process is determined. The second volume of demineralized water is then divided by the boration time to obtain the second velocity. This clarifies the process of determining the introduction velocity and volume of demineralized water, ensuring that demineralized water can be introduced at a certain rate to dilute the boric acid solution, effectively reducing the concentration of the boric acid solution, achieving slow boration of the nuclear reactor, and thus improving the accuracy of subsequent reactivity measurements.

[0118] In one embodiment, such as Figure 6 As shown, step S02, which involves determining the dilution concentration of the boric acid solution when introducing demineralized water for boration dilution, specifically includes the following steps:

[0119] S021: Based on the initial rate of boric acid solution introduction, determine the borination reactivity of introducing boric acid solution for individual borination within the borination time, and based on the borination reactivity, determine the dilution reactivity of introducing demineralized water within the borination time.

[0120] When determining the dilution concentration of boric acid solution during boration dilution by introducing demineralized water, it is necessary to determine the boration reactivity of introducing boric acid solution for separate boration within the boration time based on the initial introduction rate of the boric acid solution. Then, based on the boration reactivity, the dilution reactivity of the nuclear reactor within the boration time after introducing demineralized water is determined. This dilution reactivity is the impact of introducing a second volume of demineralized water on the reactivity of the nuclear reactor. The initial rate is the minimum pumping rate of the boric acid pump in the chemical volumetric system.

[0121] For example, the initial boric acid concentration is determined when boric acid solution is introduced alone at a first rate (i.e., without the introduction of demineralized water). This initial boric acid concentration can be measured using a boric acid concentration meter. Then, the differential boron value corresponding to this initial boric acid concentration is determined. Finally, the first volume, the first rate, and the differential boron value corresponding to the initial boric acid concentration are multiplied together to obtain the boration reactivity of introducing boric acid solution alone within the boration time. This method is simple and convenient. The differential boron value is determined based on pre-calibrated data for different boric acid concentrations.

[0122] After obtaining the boronization reactivity of introducing boric acid solution for separate boronization within the boronization time, the total required reactivity of the nuclear reactor during the boronization dilution process is determined based on the value measurement requirements of the control rods. The total required reactivity is greater than the value of the control rods. Then, the boronization reactivity is subtracted from the total required reactivity to obtain the dilution reactivity of introducing demineralized water for dilution within the boronization time.

[0123] The total demand reactivity can be a pre-defined reactivity value, which needs to be slightly greater than the reactivity value of the small-value control rod to avoid the total demand reactivity being too large and instantly overriding the value of the small-value control rod. In other embodiments, the total demand reactivity can also be calculated using a point reactor dynamics model based on relevant parameters of the nuclear reactor, resulting in higher accuracy.

[0124] S022: Based on the dilution reactivity, determine the dilution concentration of the boric acid solution after introducing demineralized water into the reactor's first loop for boration dilution.

[0125] After determining the dilution reactivity of the demineralized water introduced during the boration time, the dilution concentration of the boric acid solution after the demineralized water is introduced into the reactor's first loop for boration dilution is determined based on the dilution reactivity of the demineralized water.

[0126] In this embodiment, the boration reactivity of introducing boric acid solution for separate boration within the boration time is determined based on the first velocity. The dilution reactivity of introducing demineralized water is then determined based on the boration reactivity. Finally, based on the dilution reactivity, the dilution concentration of the boric acid solution after boration dilution by introducing demineralized water into the reactor's first loop is determined. This refines the calculation process for the dilution concentration of the boric acid solution. The dilution concentration is deduced from the dilution reactivity, which is simple and convenient, and more accurate than the calibration concentration. It also reduces the time required to measure the boric acid concentration.

[0127] In one embodiment, step S021, namely, determining the boration reactivity of introducing boric acid solution for separate boration within the boration time based on the first volume and the first velocity, and determining the dilution reactivity of introducing demineralized water within the boration time based on the boration reactivity, specifically includes the following steps:

[0128] S0211: Determine the total required reactivity of the nuclear reactor during the boronizing time based on the value measurement requirements of the control rods.

[0129] Based on the value measurement requirements of the control rods, the total required reactivity of the nuclear reactor during the boronizing dilution process is determined within the boronizing time. The value measurement requirement of the control rods involves estimating the reactivity value of the control rod based on its type, and then using this reactivity value to estimate the total required reactivity of the nuclear reactor during the boronizing time. The total required reactivity is greater than the value of the control rod. This total required reactivity can be slightly greater than the reactivity value of lower-value control rods to avoid the total required reactivity momentarily overshadowing the value of lower-value control rods. In other embodiments, the total required reactivity can also be calculated using a point reactor kinetics model based on relevant nuclear reactor parameters, resulting in higher accuracy.

[0130] S0212: Based on the first volume and the first velocity, predict the first reactivity introduction rate of the boric acid solution for a separate borination reaction, and multiply the first reactivity introduction rate by the borination time to obtain the borination reactivity of the boric acid solution for a separate borination reaction within the borination time.

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

[0132] It is important to understand that the introduction of boric acid solution into the reactivity of a nuclear reactor is influenced by the rate and concentration of the boric acid solution introduced. Different concentrations of boric acid solution introduced per unit time result in different changes in reactor reactivity; that is, different concentrations of boric acid solution correspond to different differential boron values. Therefore, the initial reactivity introduction rate for a separate borylation reaction can be determined based on the initial concentration of the boric acid solution before the introduction of demineralized water and the initial rate of boric acid introduction.

[0133] The process involves first measuring the initial concentration of the boric acid solution before the introduction of demineralized water using a boric acid concentration meter. Then, the boron differential value corresponding to this initial concentration is determined from pre-calibrated boron differential value data. Finally, this boron differential value is multiplied by the first velocity to obtain the first reactive introduction velocity for the introduction of the boric acid solution for a separate borylation reaction. The boron differential value data is pre-calibrated based on measured data from a nuclear reactor at different boric acid concentrations.

[0134] After obtaining the first reactivity introduction rate of the boric acid solution for a separate borination reaction, the first reactivity introduction rate is multiplied by the borination time to obtain the borination reactivity of the boric acid solution for a separate borination reaction within the borination time.

[0135] Specifically, the initial reactive introduction rate is calculated using the following formula:

[0136]

[0137] in, This indicates the initial reactive introduction rate of boric acid solution for a separate borylation reaction. V represents the differential value of boron corresponding to the initial concentration value; SPEED硼酸 The first speed is the rate at which the boric acid solution is introduced. When the first speed is the minimum introduction speed of the boric acid pump, then... This indicates the minimum rate of reactivity introduced into the boric acid solution for a separate borylation reaction.

[0138] S0213: Subtract the boronizing reactivity from the total demand reactivity to obtain the dilution reactivity when demineralized water is introduced for dilution during the boronizing time.

[0139] After obtaining the boration reactivity of introducing boric acid solution into the boration time for a separate boration reaction.

[0140] It is important to understand that the theoretical reactivity of a nuclear reactor during the boration time when boric acid solution and demineralized water are introduced simultaneously (i.e., the total required reactivity) is: the difference between the first reactivity introduction rate of boric acid solution and the second reactivity introduction rate of demineralized water, multiplied by the boration time, which gives the following formula:

[0141]

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

[0143] Based on the above formula, the dilution reactivity of introducing demineralized water for dilution during the boration time can be derived. Subtracting the boration reactivity from the total required reactivity gives the dilution reactivity of introducing demineralized water for dilution during the boration time. In other words, the dilution reactivity is calculated using the following formula:

[0144]

[0145] Where, △ρ 水 The dilution reactivity is the amount of demineralized water introduced during the boration time; Δρ represents the total required reactivity. The initial reactivity of boric acid solution introduces the rate; n∑t 控制棒 Denotes the boronization time, where ∑t 控制棒 The running time required for a single lifting operation is n, which is a preset multiple and is greater than 1. This indicates the boration reactivity of introducing boric acid solution during the boration time to carry out a separate boration reaction.

[0146] In this embodiment, based on the value measurement requirements of the control rods, the total required reactivity of the nuclear reactor during the borylation dilution process within the borylation time is determined. This total required reactivity is greater than the value of the control rods. Based on the first volume and the first velocity, the first reactivity introduction rate for introducing boric acid solution for a separate borylation reaction is predicted. This first reactivity introduction rate is multiplied by the borylation time to obtain the borylation reactivity for introducing boric acid solution for a separate borylation reaction within the borylation time. Then, the total required reactivity is subtracted from the borylation reactivity to obtain the dilution reactivity for introducing demineralized water for dilution within the borylation time. This process clarifies the specific steps for determining the dilution reactivity of demineralized water within the borylation time. The borylation reactivity is determined based on the boric acid reactivity introduction rate technique, and subsequently, the dilution reactivity of demineralized water is determined. The calculation is simple and highly accurate, requiring no complex testing operations.

[0147] In one embodiment, step S022, which involves determining the dilution concentration of the boric acid solution after boration dilution by introducing the demineralized water into the reactor's first loop based on its dilution reactivity, specifically includes the following steps:

[0148] S0221: Determine the differential boron value of the boric acid solution after diluting it with demineralized water.

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

[0150] Considering the relatively small reactivity value of the control rods, typically around 100 pcm, the effects of demineralized water dilution and control rod boration on the concentration of boric acid solution in the reactor's primary loop are minimal. The impact of dilution and boration on the differential boron value throughout the boration process is negligible. Therefore, the differential boron value corresponding to the initial concentration of the boric acid solution can be used as the differential boron value of the boric acid solution after dilution with demineralized water. This approach aims to reduce data processing while ensuring accuracy.

[0151] In other embodiments, the boron differential value of the boric acid solution after dilution with demineralized water can be obtained by subtracting a pre-calibrated preset value from the initial concentration value of the boric acid solution. Furthermore, a calibration concentration value lower than the initial concentration value can be determined as needed, and the boron differential value corresponding to this calibration concentration value can be determined from the pre-calibrated boron differential value data as the boron differential value of the boric acid solution after dilution with demineralized water.

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

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

[0154] The dilution concentration of the boric acid solution can be determined using the following formula:

[0155]

[0156] Among them, CB i This represents the initial concentration of the boric acid solution when demineralized water is introduced; CB f This represents the dilution concentration of the boric acid solution after demineralized water is introduced into the reactor's primary loop for boration dilution; Δρ 水 This indicates the dilution reactivity when demineralized water is introduced during the boration time. This represents the differential boron value of the boric acid solution after dilution with demineralized water.

[0157] The second volume of the demineralized water is then calculated using the following formula:

[0158]

[0159] Among them, V 水 This represents the second volume, i.e., the volume of demineralized water introduced during the boration time; V 回路 Indicates the loop volume of the reactor's primary loop; CB i This represents the initial concentration of the boric acid solution when demineralized water is introduced; CB f This represents the dilution concentration of the boric acid solution after demineralized water is introduced into the reactor's primary loop for boration dilution; Δρ 水 This indicates the dilution reactivity when demineralized water is introduced during the boration time. This represents the differential boron value of the boric acid solution after dilution with demineralized water.

[0160] The second velocity of the demineralized water is then calculated using the following formula:

[0161]

[0162] Among them, V SPEED水 This represents the second velocity of the demineralized water, i.e., the velocity at which demineralized water is introduced into the reactor's primary loop; V 水 This represents the second volume, i.e., the volume of demineralized water introduced during the boration time; n∑t 控制棒 Denotes the boronization time, where ∑t 控制棒 The time required for a single lifting operation is n, which is a preset multiple and is greater than 1.

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

[0164] It should be understood that the sequence number of each step in the above embodiments does not imply 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 embodiments of the present invention.

[0165] In one embodiment, a control rod value measuring device is provided, which corresponds one-to-one with the control rod value measuring device method described in the above embodiments. For example... Figure 7 As shown, the control bar value measuring device includes a determination module 701 and a control module 702. Detailed descriptions of each functional module are as follows:

[0166] The determination module 701 is used to determine the boronizing time for the boronizing reaction in the nuclear reactor. The boronizing time is a preset multiple of the running time required for the control rod to complete a single rod lifting operation, and the preset multiple is greater than 1.

[0167] Control module 702 is used to perform the following steps during the boronizing time:

[0168] A first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boration, and simultaneously a second volume of demineralized water is introduced at a second rate for dilution.

[0169] The control rods of a single rod bundle in a nuclear reactor are lifted to measure the reactivity value of the control rods based on the changes in reactor reactivity during the lifting process.

[0170] Alternatively, the determining module 701 can also be used to determine the second velocity in the following manner:

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

[0172] Determine the dilution concentration of the boric acid solution when introducing demineralized water;

[0173] The second volume of demineralized water is determined based on the initial concentration value, the dilution concentration value, and the loop volume of the reactor's first loop.

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

[0175] Optionally, the determining module 701 is also specifically used for:

[0176] Based on the first velocity, determine the boration reactivity of introducing boric acid solution for separate boration within the boration time, and determine the dilution reactivity of introducing demineralized water based on the boration reactivity;

[0177] Based on the dilution reactivity, the dilution concentration of the boric acid solution after boration dilution by introducing demineralized water into the reactor's first loop is determined.

[0178] Optionally, the determining module 701 is also specifically used for:

[0179] Based on the value measurement requirements of the control rods, the total required reactivity of the nuclear reactor during the boronizing process is determined, and the total required reactivity is greater than the value of the control rods.

[0180] Based on the first volume and the first velocity, the first reactivity introduction rate of the boric acid solution for a separate borination reaction is predicted, and the first reactivity introduction rate is multiplied by the borination time to obtain the borination reactivity of the boric acid solution for a separate borination reaction within the borination time.

[0181] Subtracting the boronizing reactivity from the total demand reactivity yields the dilution reactivity, which is obtained by introducing demineralized water for dilution during the boronizing time.

[0182] Optionally, the determining module 701 is also specifically used for:

[0183] Determine the differential boron value of the boric acid solution after dilution with demineralized water;

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

[0185] Optionally, the control module 702 is specifically used for:

[0186] The control rods of the single-rod bundle are raised, and the reactivity of the nuclear reactor is monitored as the control rods are raised from the lowest position to the top of the nuclear reactor to obtain data on the reactivity changes of the nuclear reactor.

[0187] The reactivity value of the control rods in a single rod bundle is determined based on reactivity change data.

[0188] Optionally, the control module 702 is specifically used for:

[0189] The segmented rod lifting method was used to control the control rods of a single rod bundle to perform multiple rod lifting operations, and the reactivity changes of the nuclear reactor were monitored during each rod lifting process to obtain reactivity change data when the control rods were lifted from the lowest position of the nuclear reactor to the top.

[0190] The interval between two adjacent rod lifting operations is a preset time, which is the settling time required by the nuclear reactor after the rod lifting is pre-defined.

[0191] It should be noted that the information interaction and execution process between the above-mentioned devices / units are based on the same concept as the method embodiments of this application. For details on their specific functions and technical effects, please refer to the method embodiments section, and they will not be repeated here.

[0192] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the above-described division of functional units and modules is merely an example. In practical applications, the above functions can be assigned to 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 embodiments can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. Furthermore, the specific names of the functional units and modules are only for easy differentiation and are not intended to limit the scope of protection of this application. The specific working process of the units and modules in the above system can be referred to the corresponding process in the foregoing method embodiments, and will not be repeated here.

[0193] This 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. When the processor 20 executes the computer program 22, it implements the steps in any of the above method embodiments, or when the processor 20 executes the computer program 22, it implements the functions of each module / unit in the above device embodiments.

[0194] For example, 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 this application. The one or more modules / units may be a series of computer program instruction segments capable of performing a specific function, which 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 The electronic device described is merely an example and does not constitute a limitation on the electronic device. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electronic device may also include input / output devices, network access devices, buses, etc.

[0196] The aforementioned processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0197] The memory can be an internal storage unit of the electronic device, such as a hard drive or RAM. The memory can also be an external storage device of the electronic device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, or Flash Card. Furthermore, the memory can include both internal and external storage units of the electronic device.

[0198] This application also provides a readable storage medium storing a computer program that, when executed by a processor, implements the steps described in the various method embodiments above.

[0199] This application provides a computer program product that, when run on a terminal device, enables the terminal device to implement the steps described in the various method embodiments above.

[0200] If the integrated unit is implemented as 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, all or part of the processes in the methods of the above embodiments of this application can be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include at least: any entity or device capable of carrying computer program code to a photographing device / terminal device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Examples include USB flash drives, portable hard drives, magnetic disks, or optical disks. In some jurisdictions, according to legislation and patent practice, computer-readable media cannot be electrical carrier signals or telecommunication signals.

[0201] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0202] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0203] In the embodiments provided in this application, it should be understood that the disclosed apparatus / devices and methods can be implemented in other ways. For example, the apparatus / device embodiments described above are merely illustrative. For instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

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

[0205] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for measuring the value of a control rod, characterized in that, include: The boronizing time for the boronizing reaction in the nuclear reactor is determined, wherein the boronizing 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 2-3 times; The following steps are performed during the boronizing time: A first volume of boric acid solution is introduced into the reactor's first loop at a first rate for boration, and simultaneously a second volume of demineralized water is introduced at a second rate for dilution. The control rods of the single rod bundle in the nuclear reactor are lifted to measure the reactivity value of the control rods based on the reactivity changes of the reactor during the lifting process. The second speed is determined in the following manner: Determine the initial concentration of the boric acid solution in the first loop of the reactor before the introduction of the demineralized water; Determine the dilution concentration of the boric acid solution when the demineralized water is introduced for dilution; The second volume of the demineralized water is determined based on the initial concentration value, the dilution concentration value, and the loop volume of the reactor's first loop. The second velocity is obtained by dividing the second volume of the demineralized water by the boration time.

2. The method as described in claim 1, characterized in that, Determining the dilution concentration of the boric acid solution when introducing the demineralized water includes: Based on the first velocity, the boration reactivity of introducing the boric acid solution for individual boration within the boration time is determined, and the dilution reactivity of introducing the demineralized water is determined based on the boration reactivity. Based on the dilution reactivity, the dilution concentration of the boric acid solution after the demineralized water is introduced into the first loop of the reactor for borylation dilution is determined.

3. The method as described in claim 2, characterized in that, The step of determining the boration reactivity of introducing the boric acid solution for individual boration within the boration time based on the first rate, and determining the dilution reactivity of introducing the demineralized water based on the boration reactivity, includes: Based on the value measurement requirements of the control rod, the total required reactivity of the nuclear reactor during the boronizing process within the boronizing time is determined, and the total required reactivity is greater than the value of the control rod; Based on the first volume and the first velocity, the first reactivity introduction rate of introducing the boric acid solution for a separate borylation reaction is predicted, and the first reactivity introduction rate is multiplied by the borylation time to obtain the borylation reactivity of introducing the boric acid solution for a separate borylation reaction within the borylation time. Subtracting the borylation reactivity from the total required reactivity yields the dilution reactivity, which is obtained by introducing the demineralized water for dilution during the borylation time.

4. The method as described in claim 2, characterized in that, The determination of the dilution concentration value of the boric acid solution after boration dilution by introducing the demineralized water into the first loop of the reactor, based on the dilution reactivity, includes: Determine the boron differential value of the boric acid solution after diluting it with the demineralized water. The dilution concentration of the boric acid solution is determined based on the initial concentration of the boric acid solution, the dilution reactivity, and the differential value of boron.

5. The method according to any one of claims 1-4, characterized in that, The process of lifting the control rods of a single-rod bundle in the nuclear reactor to measure the reactivity value of the control rods based on changes in the reactor's reactivity during the lifting process includes: The control rods of the single rod bundle are controlled to lift, and the reactivity of the nuclear reactor is monitored as the control rods are lifted from the lowest position to the top of the nuclear reactor, so as to obtain the reactivity change data of the nuclear reactor. The reactivity value of the control rod in the single rod bundle is determined based on the reactivity change data.

6. The method as described in claim 5, characterized in that, The control rods of the control single rod bundle are lifted, and the reactivity of the nuclear reactor is monitored as the control rods are lifted from the lowest position to the top of the nuclear reactor, obtaining reactivity change data of the nuclear reactor, including: 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 changes of the nuclear reactor are monitored during each rod lifting process to obtain the reactivity change data when the control rods are lifted from the lowest position of the nuclear reactor to the top. The interval between two consecutive rod lifting operations is a preset time, which is the settling time required by the nuclear reactor after the rod lifting is pre-defined.

7. A control rod value measurement system, characterized in that, Includes a control rod and a control rod value measuring device, the control rod value measuring device being used for: The boronizing time for the boronizing reaction in the nuclear reactor is determined, wherein the boronizing 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 2-3 times; The following steps are performed during the boronizing time: A first volume of boric acid solution is introduced into the reactor's first loop at the minimum pumping speed of the boric acid pump for boration, and a second volume of demineralized water is introduced simultaneously at the second speed for dilution. The control rods of the single rod bundle in the nuclear reactor are lifted to measure the reactivity value of the control rods based on the reactivity changes of the reactor during the lifting process. The second speed is determined in the following manner: Determine the initial concentration of the boric acid solution in the first loop of the reactor before the introduction of the demineralized water; Determine the dilution concentration of the boric acid solution when the demineralized water is introduced for dilution; The second volume of the demineralized water is determined based on the initial concentration value, the dilution concentration value, and the loop volume of the reactor's first loop. The second velocity is obtained by dividing the second volume of the demineralized water by the boration time.

8. 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, it implements the steps of the control rod value measurement method as described in any one of claims 1 to 6.

9. A readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the control bar value measurement method as described in any one of claims 1 to 6.

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