Method and computer device for preventing frequent control rod movement in a nuclear power plant

Abstract

The application belongs to the technical field of nuclear power plant reactor operation, and particularly relates to a method for preventing frequent action of a control rod of a nuclear power plant and a computer device, which comprises the following steps: S10, acquiring four measurement signals of four different channels sent by a temperature measurement bypass, the types of the measurement signals being one or more of an average temperature signal, a primary loop nuclear power signal and a secondary loop steam turbine power signal; S20, selecting a second highest measurement signal in the four measurement signals in real time through a second highest selection unit; and S30, driving action adjustment of the control rod by using the second highest measurement signal. The output of the second highest selection unit is alternately controlled by the measurement signals of different channels, so that the technical problem of how to avoid the increase of equipment failure rate caused by long-term frequent action of the control rod is solved.

Description

Technical Field

[0001] This application belongs to the field of nuclear power plant reactor operation technology, specifically relating to a method and computer device for preventing frequent actuation of control rods in a nuclear power plant. Background Technology

[0002] Nuclear power units (such as M310) employ a reactor-following-machine mode. The reactor power regulation system's role is to match the power generated by the primary loop with the load of the secondary loop. Changes in load and efficiency cause actual temperature variations in the primary loop. The reactor stabilizes the average primary loop temperature at a set value by raising or lowering control rods. During normal power operation, the number of control rod movements is less than 10 steps per day. If the frequency of control rod movements increases, the frictional losses of the control rod drive mechanism increase, leading to a higher equipment failure rate and a decrease in the reliability of the power regulation system. Furthermore, the total number of reactor control rod movements is explicitly required in the technical specifications. Reducing control rod movement wear and extending their service life is beneficial for extending the reactor's lifespan from 40 to 60 years. After a major overhaul of one unit, the number of control rod movements increased to over 30 steps per day, more than five times the daily frequency before the overhaul. Similar frequent control rod movements have also occurred in other nuclear power units. Summary of the Invention

[0003] In view of this, this application provides a method and computer device for preventing frequent operation of control rods in nuclear power plants. By setting the output of the secondary high-selection unit to be alternately controlled by measurement signals from different channels, the technical problem of how to avoid the increase in equipment failure rate caused by long-term frequent operation of control rods is solved.

[0004] The first aspect of this application provides a method for preventing frequent actuation of control rods in a nuclear power plant, the method comprising: Step S10: Acquire four measurement signals from four different channels sent by the temperature measurement bypass. The measurement signal type is one or more of the following: average temperature signal, primary loop nuclear power signal, and secondary loop turbine power signal. Step S20: Select the second highest measurement signal from the four measurement signals in real time using the second highest selection unit; Step S30: Use the second highest measurement signal to drive the control rod to adjust its movement.

[0005] In one specific embodiment of this application, after step S10, the method for preventing frequent actuation of control rods in a nuclear power plant further includes: Step S1: Correct the four measurement signals so that the deviation between the four measurement signals is not greater than the required range, and at the same time, the fluctuation range of the channel corresponding to the measurement signal with the second highest mean intersects with the fluctuation range of at least one adjacent channel.

[0006] In one specific embodiment of this application, the measurement signal is an average temperature signal, and step S30 includes: Step S31: Output the second highest average temperature signal to the second highest average temperature measurement and control unit, and use the second highest average temperature measurement and control unit to drive the control rod to adjust its movement.

[0007] In one specific embodiment of this application, the measurement signal is the power signal of the second-loop steam turbine, and step S30 includes: Step S32: Output the second highest secondary circuit turbine power signal to the second highest secondary circuit turbine power signal measurement and control unit, and use the second highest secondary circuit turbine power signal measurement and control unit to drive the control rod to adjust its movement.

[0008] In one specific embodiment of this application, the measurement signal is the power signal of the second-loop steam turbine, and step S30 includes: Step S33: Output the second highest secondary circuit turbine power signal to the second highest secondary circuit turbine power signal measurement and control unit, and use the second highest secondary circuit turbine power signal measurement and control unit to drive the control rod to adjust its movement.

[0009] A second aspect of this application provides a computer apparatus including a processor and a memory. The processor is used to execute a method for preventing frequent actuation of control rods in a nuclear power plant, as described in the first aspect of this application. The memory is used to store executable instructions for the processor.

[0010] A third aspect of this application provides a computer-readable storage medium storing executable instructions for a computer. When executed by a processor, the executable instructions implement a method for preventing frequent actuation of control rods in a nuclear power plant, as described in the first aspect of this application.

[0011] The fourth aspect of this application provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements a method for preventing frequent actuation of control rods in a nuclear power plant according to the first aspect of this application.

[0012] The beneficial effects of the technical solution of this application are as follows: by setting the output of the second highest selection unit (i.e., the selected second highest measurement signal) to be alternately controlled by measurement signals from different channels, it is equivalent to adding a filtering stage to the signal output to the control system, which greatly reduces the fluctuation of the output signal. As a result, the fluctuation of the output of the second highest selection unit is significantly reduced, the amount of change acting on the open-loop control is reduced, the frequency of control rod action is significantly reduced, the failure rate caused by long-term frequent action of control rods is avoided, and the reliability and stability of the reactor power regulation system are improved. Attached Figure Description

[0013] Figure 1The diagram shown is a flowchart illustrating a method for preventing frequent actuation of control rods in a nuclear power plant, according to an embodiment of this application.

[0014] Figure 2 As shown Figure 1 The graph shows the changes in the average temperature signals before the implementation of the technical solution in the illustrated embodiment.

[0015] Figure 3 As shown Figure 1 The graph shows the curve change of the high-selection output signal before the implementation of the technical solution of the embodiment shown.

[0016] Figure 4 As shown Figure 1 The curves showing the changes in the average temperature signals after the implementation of the technical solution in the illustrated embodiment are shown.

[0017] Figure 5 As shown Figure 1 The graph shows the curve change of the secondary high-selection output signal after the implementation of the technical solution in the embodiment shown.

[0018] Figure 6 As shown Figure 1 A schematic diagram showing the comparison of the number of times the control rod moves per day before and after the implementation of the technical solution in the illustrated embodiment. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0020] At least one embodiment of this application provides a method for preventing frequent actuation of control rods in a nuclear power plant, see reference. Figure 1 The method for preventing frequent actuation of control rods in the nuclear power plant includes the following steps S10 and S20.

[0021] Step S10: Obtain four measurement signals from four different channels sent by the temperature measurement bypass. The measurement signal type is one or more of the following: average temperature signal, primary loop nuclear power signal, and secondary loop turbine power signal.

[0022] It should be noted that the primary loop nuclear power signal can also be called the nuclear power measurement signal or the nuclear power signal. The secondary loop turbine power signal can also be called the secondary loop power or the turbine inlet pressure signal representing the secondary loop power.

[0023] Step S20: Select the second highest measurement signal among the four measurement signals in real time through the secondary high selection unit.

[0024] Step S30: Use the second highest measurement signal to drive the control rod to adjust its movement.

[0025] It should be noted that the second highest measurement signal is used for both open-loop and closed-loop control of the primary power circuit, i.e., to adjust the movement of the drive control rod. The second highest measurement signal can also be called the secondary high-select output signal or the output of the secondary high-select unit.

[0026] According to the technical solution provided in the embodiments of this application, by setting the output of the second highest selection unit (i.e., the selected second highest measurement signal) to be alternately controlled by measurement signals from different channels, it is equivalent to adding a filtering stage to the signal output to the control system, which greatly reduces the fluctuation of the output signal. As a result, the fluctuation of the output of the second highest selection unit is significantly reduced, the amount of change acting on the open-loop control is reduced, the frequency of control rod action is significantly reduced, the failure rate caused by long-term frequent action of the control rod is avoided, and the reliability and stability of the reactor power regulation system are improved.

[0027] In at least one embodiment of this application, step S1 is included after step S10.

[0028] Step S1: Correct the four measurement signals so that the deviation between the four measurement signals is not greater than the required range, and at the same time, the fluctuation range of the channel corresponding to the measurement signal with the second highest mean intersects with the fluctuation range of at least one adjacent channel.

[0029] For example, loop 1 has two channels, namely channel 1 and channel 2. Loop 2 has two channels, namely channel 3 and channel 4. Each channel has a hot section and a cold section, and the average temperature of the hot and cold sections is the average temperature signal of the corresponding channel. During normal operation, the temperatures and trends of the eight thermometers on the cold and hot sections of the two loops (i.e., loop 1 and loop 2) should be consistent. However, during the initial calibration of the eight thermometers in the cold and hot sections, if the cumulative positive and negative deviations of each thermometer lead to a large deviation in the four measurement channels, calibration is performed to ensure that the deviations of the four channels in the final output are within the specified range, and that the fluctuation range of the channel with the second highest average value intersects with the fluctuation range of at least one adjacent channel.

[0030] In the above embodiments, by correcting each group of measurement signals, the deviation between each measurement signal is not greater than the required range. At the same time, the fluctuation range of the channel corresponding to the measurement signal with the second highest mean overlaps with the fluctuation range of the adjacent channel in many ways. This ensures that the second highest selected signal (i.e., the second highest measurement signal) is not a fixed single channel, weakening the impact of fluctuations in a single channel. This significantly reduces the fluctuation of the second highest selected output signal, significantly reduces the number of control rod actions, and significantly improves the stability of the control system.

[0031] In at least one embodiment of this application, the measurement signal is an average temperature signal, and step S31 is a specific implementation of step S30.

[0032] Step S31: Output the second highest average temperature signal to the second highest average temperature measurement and control unit, and use the second highest average temperature measurement and control unit to drive the control rod to adjust its movement.

[0033] It should be noted that the second highest average temperature signal can also be called the second highest average temperature selection signal.

[0034] In at least one embodiment of this application, the measurement signal is a dual-loop steam turbine power signal, and step S32 is a specific implementation of step S30.

[0035] Step S32: Output the second highest secondary circuit turbine power signal to the second highest secondary circuit turbine power signal measurement and control unit, and use the second highest secondary circuit turbine power signal measurement and control unit to drive the control rod to adjust its movement.

[0036] In at least one embodiment of this application, the measurement signal is a dual-loop steam turbine power signal, and step S33 is a specific implementation of step S30.

[0037] Step S33: Output the second highest secondary circuit turbine power signal to the second highest secondary circuit turbine power signal measurement and control unit, and use the second highest secondary circuit turbine power signal measurement and control unit to drive the control rod to adjust its movement.

[0038] Example 1: Optimization of the secondary high-selectivity average temperature measurement and control unit The four average temperature signals from the temperature bypass are processed by the second highest temperature selection unit, and the second highest temperature signal is selected for primary loop power control, i.e., to drive the control rod to adjust its movement.

[0039] In an average temperature measurement system, the deviation of each channel is required to be no more than 0.5℃. Ideally, the four average temperature signals should remain essentially consistent. However, in reality, even adhering to this requirement may result in significant deviations between the temperature signals, leading to stratification of the four average temperature signals. In extreme cases, this could cause the second-highest selected signal sent to the control system to consistently originate from a single, fixed channel. Calculations show that if this fixed channel experiences a rise or fall of ±0.17℃ for more than 3 seconds, the temperature deviation signal sent to the control rod adjustment system after signal processing can reach ±0.17℃. 5.532 = ±0.94044℃. Exceeding the set value of ±0.83℃ will cause the control rod to move.

[0040] For example, Figure 2 Not adopted Figure 1The technical solution of the embodiment shown is a curve of the average temperature signal of the four channels (i.e., the average temperature of channel 1 in loop 1, the average temperature of channel 2 in loop 1, the average temperature of channel 3 in loop 2, and the average temperature of channel 4 in loop 2). Figure 3 Not adopted Figure 1 The technical solution of the embodiment shown is a graph showing the curve change of the secondary high selection output signal. Figure 2 and Figure 3 The horizontal axis duration is 24 hours. Figure 2 The 3.00 minute interval refers to taking a measurement point every 3 minutes. Figure 2 and Figure 3 It can be seen that the average temperature signals of the four channels (i.e., the average temperature of channel 1 in loop 1, the average temperature of channel 2 in loop 1, the average temperature of channel 3 in loop 2, and the average temperature of channel 4 in loop 2) show obvious stratification among each other.

[0041] When the actual temperature remains constant, the measurement results of each channel cannot be completely consistent due to the error of the measuring instruments, and each channel's output signal has a fluctuation, the range of which is related to the accuracy of the thermometer. This embodiment addresses this by setting the output of the second-highest selected unit (i.e., the selected second-highest measurement signal) to be alternately controlled by measurement signals from different channels, and by correcting the four average temperature signals, ensuring that the deviation between each average temperature signal does not exceed the required range while maintaining the second-highest selected signal from a different channel, thus mitigating the impact of fluctuations from a single channel.

[0042] In addition, this embodiment of the application corrects and adjusts the four average temperature signals within the allowable measurement error range so that the signal values ​​of the second highest channel and the two adjacent channels intersect. For example, if the average temperature signals of the four different channels are channel 1, channel 2, channel 3 and channel 4 from high to low, then at least the signal fluctuation ranges of channel 1 and channel 2, or channel 2 and channel 3, need to intersect. The more intersecting ranges or the more intersecting channels, the better the stability of the second highest measurement signal output by the second highest selection unit.

[0043] Figure 4 To adopt Figure 1 The curves showing the changes in the average temperature signals after the implementation of the technical solution in the illustrated embodiment are shown. Figure 5 To adopt Figure 1 The graph shows the curve change of the secondary high-selection output signal after the implementation of the technical solution in the embodiment shown. Figure 4 and Figure 5 The horizontal axis duration is 24 hours. Figure 4 The 4.00-minute interval refers to taking a measurement point every 4 minutes. Figure 4 and Figure 2 A comparison shows that using Figure 1After implementing the technical solution of the illustrated embodiment, the deviation of the average temperature signals corresponding to different channels is significantly reduced, thus... Figure 5 and Figure 3 The comparison shows that the fluctuation of the second-highest selected output signal is significantly reduced, and correspondingly, the reference... Figure 6 The number of control rod movements was significantly reduced from 30 times / day before implementation to 5 times / day.

[0044] Tests have proven that the following method is effective: Figure 2 The illustrated embodiment effectively avoids significant stratification among the four average temperature measurement channels, meaning that the signals do not overlap during random fluctuations. During signal fluctuations, the output of the secondary high-select unit is alternately controlled by different channel values. This is equivalent to adding a filtering stage to the signal output to the control system, significantly reducing output signal fluctuations. Consequently, the fluctuation of the primary loop average temperature signal output by the secondary high-select unit is significantly reduced, the number of control rod actions is significantly reduced, and the stability of the control system is significantly improved.

[0045] Example 2: Optimization of the secondary high-voltage selector circuit turbine power signal measurement and control unit This application's implementation involves correcting and adjusting the four secondary turbine power signals within an allowable measurement error range. This ensures that the signal values ​​of the second-highest selector channel intersect with those of the two adjacent channels. For example, if the average turbine inlet pressure signals of the four channels are channel 1, channel 2, channel 3, and channel 4 from highest to lowest, then at least the signal fluctuation ranges of channels 1 and 2, or channels 2 and 3, must intersect. The more intersecting ranges or the more intersecting channels, the better the stability of the second-highest selector output. In practical terms, this avoids significant stratification among the four turbine inlet pressure measurement channels, meaning that the signals do not cross each other during random fluctuations. During signal fluctuations, the output of the second-highest selector unit will alternately use values ​​from different channels for control. This is equivalent to adding a filtering stage to the signal output to the control system, significantly reducing output signal fluctuations. Consequently, the fluctuations of the secondary turbine power signal output by the second-highest selector are significantly reduced, the amount of change acting on the open-loop control is reduced, the number of control rod actions is significantly reduced, and the stability of the control system is significantly improved.

[0046] Example 3: Optimization of the primary loop nuclear power signal measurement and control unit for secondary high-selectivity nuclear power This embodiment achieves this by correcting and adjusting the four primary-loop nuclear power signals within an allowable measurement error range. This ensures that the signal values ​​of the second-highest selector channel intersect with those of the two adjacent channels. For example, if the average temperature signals of the four channels are ranked from highest to lowest as Channel 1, Channel 2, Channel 3, and Channel 4, then at least the signal fluctuation ranges of Channel 1 and Channel 2, or Channel 2 and Channel 3, must intersect. The more intersecting ranges or the more intersecting channels, the better the stability of the second-highest selector output. In terms of implementation, this avoids significant stratification among the four nuclear power measurement channels, meaning that the signals do not cross each other during random fluctuations. During signal fluctuations, the output of the second-highest selector unit will alternately use values ​​from different channels for control. This is equivalent to adding a filtering stage to the signal output to the control system, significantly reducing the fluctuation of the output signal. This results in a significant reduction in the fluctuation of the nuclear power signal output by the second-highest selector, a reduction in the amount of change affecting the open-loop control, a significant reduction in the number of control rod actions, and a significant improvement in the stability of the control system.

[0047] At least one embodiment of this application also provides a computer device including a processor and a memory. The processor is used to execute a method for preventing frequent control rod actuation in a nuclear power plant according to any of the above embodiments of this application. The memory is used to store executable instructions of the processor, such as application programs. There can be one or more processors. The application programs stored in the memory can include one or more modules, each corresponding to a set of instructions. Furthermore, the processor is configured to execute instructions to perform the above-described method for preventing frequent control rod actuation in a nuclear power plant.

[0048] The computer device may also include a power supply component configured for power management, a wired or wireless network interface configured to connect the computer device to a network, and an input / output (I / O) interface. The computer device can operate on an operating system stored in memory, such as Windows Server. TM Mac OSX TM Unix TM Linux TM FreeBSD TM Or similar.

[0049] At least one embodiment of this application also provides a computer-readable storage medium storing executable instructions for a computer thereon. When executed by a processor, the executable instructions implement a method for preventing frequent actuation of control rods in a nuclear power plant, as provided in any of the above embodiments of this application.

[0050] A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of the computer device, enables the computer device to perform the method for preventing frequent actuation of control rods in a nuclear power plant. The method for preventing frequent actuation of control rods in a nuclear power plant is executed by an agent program.

[0051] Those skilled in the art will recognize that the algorithmic steps of the various examples described in conjunction with the embodiments disclosed in this application 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.

[0052] At least one embodiment of this application also provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements a method for preventing frequent actuation of control rods in a nuclear power plant provided in any of the above embodiments of this application.

[0053] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a computer program product. This computer program product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method for preventing frequent operation of control rods in nuclear power plants according to various embodiments of this application. The aforementioned storage medium includes various media capable of storing program verification codes, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0054] It should be noted that the combination of the technical features in the embodiments of this application is not limited to the combination methods described in the embodiments of this application or the combination methods described in specific embodiments. All technical features described in this application can be freely combined or combined in any way, unless they contradict each other.

[0055] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," and / or "the" do not specifically refer to the singular and may also include the plural. Generally speaking, the term "comprising" only indicates that it includes the explicitly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements.

[0056] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications or equivalent substitutions made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for preventing frequent actuation of control rods in a nuclear power plant, characterized in that, include: Step S10: Acquire four measurement signals from four different channels sent by the temperature measurement bypass. The measurement signal type is one or more of the following: average temperature signal, primary loop nuclear power signal, and secondary loop turbine power signal. Step S1: Correct the four measurement signals so that the deviation between the four measurement signals is not greater than the required range, and at the same time, the fluctuation range of the channel corresponding to the measurement signal with the second highest mean intersects with the fluctuation range of at least one adjacent channel. Step S20: Select the second highest measurement signal from the four measurement signals in real time using the second highest selection unit; Step S30: Use the second highest measurement signal to drive the control rod to adjust its movement.

2. The method for preventing frequent actuation of control rods in a nuclear power plant according to claim 1, characterized in that, The measurement signal is an average temperature signal. Step S30 includes: Step S31: Output the second highest average temperature signal to the second highest average temperature measurement and control unit, and use the second highest average temperature measurement and control unit to drive the control rod to adjust its movement.

3. The method for preventing frequent actuation of control rods in a nuclear power plant according to claim 1, characterized in that, The measured signal is the power signal of the second-loop steam turbine. Step S30 includes: Step S32: Output the second highest secondary circuit turbine power signal to the second highest secondary circuit turbine power signal measurement and control unit, and use the second highest secondary circuit turbine power signal measurement and control unit to drive the control rod to adjust its movement.

4. A computer device, characterized in that, include: A processor for executing a method for preventing frequent actuation of control rods in a nuclear power plant, as described in any one of claims 1 to 3; as well as Memory for storing the executable instructions of the processor.

5. A computer-readable storage medium having executable instructions stored thereon, characterized in that, When the executable instructions are executed by the processor, they implement a method for preventing frequent actuation of control rods in a nuclear power plant, as described in any one of claims 1 to 3.

6. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement a method for preventing frequent actuation of control rods in a nuclear power plant, as described in any one of claims 1 to 3.

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