Rapid power reduction method and device for nuclear power plant

Abstract

The invention provides a rapid power reduction method and device for a nuclear power plant, and the method comprises the steps: starting a rapid power reduction system for rapid power reduction in a load shedding transient process until the power reduction amplitude of the rapid power reduction system is a first power reduction amplitude, the sum of the first power drop amplitude and the capacity of the steam turbine bypass system is not smaller than the maximum drop amplitude of the load when the load is thrown to plant power; and when the rapid power reduction system is started, reactor shutdown protection of the negative change rate of the neutron fluence rate is locked. According to the method, the power reduction amplitude of rapid power reduction is determined according to the capacity of the bypass system of the steam turbine, so that the technical problem of how to reduce the size of a condenser by reducing redundant steam in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power, and in particular to a method and a device for rapidly reducing power of a nuclear power plant. Background Art

[0002] The condenser of a nuclear power plant is the cold source of the thermal cycle system of the nuclear power plant. Its basic function is to receive the exhaust steam from the turbine and condense it into water, forming a closed thermal cycle. At the same time, it also receives the steam directly discharged from the turbine bypass system and condenses it into water.

[0003] In order to improve the economy of nuclear power plants, reducing the size of condensers is an important way. The design benchmark condition of the condenser is the maximum load shedding transient of the nuclear power plant. During the load shedding transient process, the excess steam is directly bypassed by the turbine and discharged into the condenser.

[0004] In order to reduce the size of the condenser, it is necessary to reduce the excess steam as much as possible, thereby reducing the demand for condensation steam of the condenser. That is, how to reduce the size of the condenser by reducing the excess steam has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present invention provides a method and device for rapid power reduction of a nuclear power plant, which solves the technical problem of how to reduce the size of a condenser by reducing excess steam in the prior art by determining the power reduction amplitude of rapid power reduction according to the capacity of a turbine bypass system.

[0006] The present invention provides a method for rapid power reduction of a nuclear power plant, comprising: in a load shedding transient process, starting a rapid power reduction system to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system is a first power reduction amplitude, and the sum of the first power reduction amplitude and the capacity of a turbine bypass system is not less than the maximum load reduction amplitude when the load is shed to the plant power supply; when starting the rapid power reduction system, locking the neutron injection rate negative change rate shutdown protection.

[0007] In a specific embodiment of the present invention, the maximum load reduction range when shedding load to the auxiliary power supply is no more than 85%, and / or the capacity of the turbine bypass system is 50%.

[0008] In a specific embodiment of the present invention, the nuclear power plant rapid power reduction method also includes: during the load shedding transient process, determining whether the magnitude of the load shedding is less than the capacity of the turbine bypass system; if the magnitude of the load shedding is less than the capacity of the turbine bypass system, the rapid power reduction system is not triggered to perform rapid power reduction.

[0009] In the above-mentioned process of load shedding transient, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches the first power reduction amplitude, including: if the amplitude of load shedding is not less than the capacity of the turbine bypass system, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches the first power reduction amplitude.

[0010] In a specific embodiment of the present invention, the nuclear power plant rapid power reduction method also includes: determining multiple rapid power reduction rod group combinations based on the layout of the reactor control rod group and the rod group value, the number of rod groups in the rapid power reduction rod group combination being less than the number of rod groups in the reactor control rod group; determining the rapid power reduction rod group combination when the rapid power reduction system rapidly reduces power under different load shedding transients based on the values ​​of the multiple rapid power reduction rod group combinations, so that the sum of the power reduction amplitude of the rapid power reduction system and the capacity of the turbine bypass system is not less than the maximum load reduction amplitude when the load is shed to the plant power supply.

[0011] The above-mentioned method of starting the rapid power reduction system to perform rapid power reduction during the load shedding transient process until the power reduction amplitude of the rapid power reduction system is a first power reduction amplitude comprises: starting the rapid power reduction system during different load shedding transient processes, and controlling the rapid power reduction system to release a preset control rod group according to the rapid power reduction rod group combination corresponding to different load shedding transient processes, until the power reduction amplitude of the rapid power reduction system is a first power reduction amplitude.

[0012] In a specific embodiment of the present invention, the nuclear power plant rapid power reduction method also includes: using an analytical model to simulate the load shedding transient process, and analyzing whether a protection signal, an atmospheric release valve opening signal, or a steam generator safety valve opening signal is triggered during the load shedding transient process according to the simulation results of the load shedding transient process; if any of the protection signal, the atmospheric release valve opening signal, and the steam generator safety valve opening signal is triggered during the load shedding transient process, then increasing the power reduction amplitude of the rapid power reduction to a second power reduction amplitude to ensure that any of the protection signal, the atmospheric release valve opening signal, and the steam generator safety valve opening signal is no longer triggered during the load shedding transient process. The second power reduction amplitude is greater than the first power reduction amplitude. The sum of the second power reduction amplitude and the capacity of the turbine bypass system is not less than the maximum load reduction amplitude when the load is shed to the plant power supply.

[0013] The above-mentioned process of starting the rapid power reduction system to rapidly reduce power during the load shedding transient process until the power reduction amplitude of the rapid power reduction system is a first power reduction amplitude includes: during the load shedding transient process, starting the rapid power reduction system to rapidly reduce power until the power reduction amplitude of the rapid power reduction system is a second power reduction amplitude.

[0014] In a specific embodiment of the present invention, the second power reduction amplitude is the sum of the first power reduction amplitude and at least one first preset step length.

[0015] In a specific implementation of the present invention, the first preset step size ranges from 5% to 10%.

[0016] In a specific embodiment of the present invention, the nuclear power plant rapid power reduction method further includes: using an analytical model to simulate the accident transient process, and analyzing whether the steam pressure in the accident transient process is lower than the limit criterion according to the simulation results of the accident transient process; if the steam pressure in the accident transient process is not lower than the limit criterion, then increasing the power reduction amplitude of the rapid power reduction to a third power reduction amplitude to ensure that the steam pressure in the accident transient process is lower than the limit criterion, and the third power reduction amplitude is greater than the first power reduction amplitude. The sum of the third power reduction amplitude and the capacity of the turbine bypass system is not less than the maximum load reduction amplitude when the load is shed to the plant power supply.

[0017] The above-mentioned process of starting the rapid power reduction system to rapidly reduce power during the load shedding transient process until the power reduction amplitude of the rapid power reduction system is a first power reduction amplitude includes: during the load shedding transient process, starting the rapid power reduction system to rapidly reduce power until the power reduction amplitude of the rapid power reduction system is a third power reduction amplitude.

[0018] In a specific embodiment of the present invention, the third power reduction amplitude is the sum of the first power reduction amplitude and at least one second preset step length.

[0019] In a specific implementation of the present invention, the accident transient process is the loss of off-site power.

[0020] The second aspect of the present invention provides a rapid power reduction device for a nuclear power plant, which includes a starting module and a locking module. The starting module is used to start the rapid power reduction system to perform rapid power reduction during the load shedding transient process until the power reduction amplitude of the rapid power reduction system reaches a first power reduction amplitude. The sum of the first power reduction amplitude and the capacity of the turbine bypass system is not less than the maximum load reduction amplitude when the load is shed to the plant power supply. The locking module is used to lock the neutron injection rate negative change rate shutdown protection when starting the rapid power reduction system.

[0021] The third aspect of the present invention provides a computer device, which includes a processor and a memory. The processor is used to execute a nuclear power plant rapid power reduction method provided in the first aspect of the present invention. The memory is used to store executable instructions of the processor.

[0022] A fourth aspect of the present invention provides a computer-readable storage medium on which executable instructions of a computer are stored. When the executable instructions are executed by a processor, a method for rapid power reduction of a nuclear power plant provided in the first aspect of the present invention is implemented.

[0023] A fifth aspect of the present invention provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements a method for rapid power reduction of a nuclear power plant provided in the first aspect of the present invention.

[0024] Compared with the prior art, the rapid power reduction method for a nuclear power plant of the present invention proposes a method for determining the power reduction amplitude of rapid power reduction according to the capacity of the turbine bypass system, which not only reduces the emission requirements borne by the condenser steam bypass exhaust required by the turbine bypass system capacity, but also enables the rapid power reduction method for a nuclear power plant to meet the corresponding design criteria requirements such as reduction amplitude and steam pressure, and meet the transient requirements of load shedding. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Shown is a flow chart of a method for rapid power reduction of a nuclear power plant provided in one embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0027] After careful study, it is found that in the process of reducing the size of the condenser by reducing the excess steam, on the one hand, the excess steam should be reduced as much as possible, and on the other hand, the design should also meet the requirements of relevant design criteria. The embodiment of the present invention proposes a method of adopting a rapid power reduction design of a nuclear power plant, and determining the power reduction amplitude of the rapid power reduction according to the capacity of the turbine bypass system. When the capacity requirement of the turbine bypass system is reduced, the nuclear power reduction rate can be increased in the load rejection transient to prevent the secondary circuit from overpressure and reduce the capacity requirement of the turbine bypass system.

[0028] The embodiment of the present invention discloses a method for rapid power reduction of a nuclear power plant, and the execution subject of the method for rapid power reduction of a nuclear power plant may be a processor or a server. Figure 1 , the nuclear power plant rapid power reduction method includes the following steps.

[0029] S1: During the load shedding transient process, the rapid power reduction system is started to rapidly reduce power until the power reduction range of the rapid power reduction system reaches the first power reduction range. The sum of the first power reduction range and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the plant power supply.

[0030] It should be noted that shedding load to plant power is the most demanding operating condition for the turbine bypass system during normal operation of a nuclear power plant.

[0031] The capacity of the steam turbine bypass system may be determined according to the actual model or size of the steam turbine bypass system, etc. For example, in some embodiments, the capacity of the steam turbine bypass system may be 50%.

[0032] The preset ratio can be set according to actual needs. For example, the power reduction range of the rapid power reduction system plus the capacity of the turbine bypass system (in %) can be considered to be equivalent to the load reduction range when the load is shed to the plant power. According to the current plant power load level of domestic nuclear power plants, the power reduction range of the rapid power reduction system and the capacity of the turbine bypass system are generally not less than 85%. For example, in some embodiments, the maximum load reduction range when the load is shed to the plant power is not greater than 85%.

[0033] S2: When starting the rapid power reduction system, the neutron injection rate negative change rate shutdown protection is locked.

[0034] According to the technical solution provided by the embodiment of the present invention, by setting the rapid power reduction system to start during the load shedding transient process until the power reduction amplitude of the rapid power reduction system is the first power reduction amplitude, the secondary circuit overpressure is prevented by rapid power reduction, and the emission requirements borne by the condenser steam bypass are reduced, and the main steam production and the turbine bypass system capacity requirements are reduced, which is conducive to reducing the size of the condenser. In addition, by setting the sum of the first power reduction amplitude and the turbine bypass system capacity to be not less than the maximum load reduction amplitude when the load is shed to the plant power supply, the rapid power reduction method of the nuclear power plant meets the corresponding design criteria such as the reduction amplitude and the steam pressure. In addition, since the negative change rate of the neutron injection rate will reach the neutron injection rate negative change rate shutdown protection signal currently set by the nuclear power plant after the rapid power reduction is started, in order to ensure the normal operation of the reactor, the neutron injection rate negative change rate shutdown protection is locked when the rapid power reduction system is started.

[0035] In a specific embodiment of the present invention, the method for rapid power reduction of a nuclear power plant further includes S01 and S02, wherein S1-1 is a specific implementation of the above S1.

[0036] S01: During the load shedding transient process, determine whether the load shedding amplitude is less than the turbine bypass system capacity.

[0037] S02: If the magnitude of load shedding is less than the capacity of the turbine bypass system, the rapid power reduction system will not be triggered for rapid power reduction.

[0038] S1-1: If the load shedding amplitude is not less than the turbine bypass system capacity, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches the first power reduction amplitude.

[0039] In the embodiment of the present invention, by determining whether the rapid power reduction system is started according to the magnitude of load shedding and the capacity of the turbine bypass system, for large load shedding (that is, the magnitude of load shedding is not less than the capacity of the turbine bypass system), the rapid power reduction system is used to perform rapid power reduction to achieve the purpose of rapidly reducing nuclear power, thereby reducing the emission demand borne by the condenser steam bypass exhaust; for small load shedding (that is, the magnitude of load shedding is less than the capacity of the turbine bypass system), only the turbine bypass system can be relied upon without triggering rapid power reduction, thereby achieving reasonable utilization of the rapid power reduction system.

[0040] In a specific embodiment of the present invention, the method for rapid power reduction of a nuclear power plant further includes S03 and S04, and S1-2 is a specific implementation of the above S1.

[0041] S03: Determine a plurality of rapid power reduction rod group combinations according to the arrangement of the reactor control rod groups and the rod group values, wherein the number of rod groups in the rapid power reduction rod group combinations is less than the number of rod groups in the reactor control rod group.

[0042] It should be noted that the reactor control rod group includes M rod groups, the rapid power reduction rod group combination includes N rod groups, M and N are both positive integers, and M>N.

[0043] S04: According to the values ​​of multiple combinations of rapid power reduction rod groups, determine the combination of rapid power reduction rod groups when the rapid power reduction system rapidly reduces power under different load shedding transients, so that the sum of the power reduction range of the rapid power reduction system and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the plant power supply.

[0044] It should be noted that different load shedding transients include load shedding transients at the beginning and end of the life cycle, full-power load shedding to plant power, full-power load shedding to a power level that just does not trigger rapid power reduction, and intermediate-power load shedding to plant power.

[0045] For example, the designer can preliminarily select possible combinations of rapid power reduction rod groups based on the arrangement of the reactor control rod groups and the rod group value. The designer can calculate the power reduction range of these rapid power reduction rod group combinations before and after they are released based on their values, and select rapid power reduction rod group combinations when the rapid power reduction system rapidly reduces power under different load shedding transients, so that after these rapid power reduction rod group combinations are reduced, the sum of the expected power reduction range of the rapid power reduction system and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the plant power supply.

[0046] Different load shedding transients can be divided into different cycles. For different cycles such as the first cycle, each transition cycle and the balance cycle, different combinations of rapid power reduction rod groups can be selected according to different fuel consumption in different cycles. For example, different combinations of rapid power reduction rod groups can be selected at the beginning and end of the life cycle. By calculating various possible release rod group situations, the control rod group released when the rapid power reduction is triggered at different cycles and fuel consumption moments is determined. The released control rod group should be able to ensure that the power reduction amplitude of the rapid power reduction system and the sum of the turbine bypass system capacity are not less than the maximum load reduction amplitude when the load is shed to the plant power supply, and at the same time be as close to this amplitude as possible. Different rapid power reduction rod group combinations are preset for different cycles and fuel consumption moments.

[0047] S1-2: During different load shedding transient processes, the rapid power reduction system is started, and the rapid power reduction system is controlled to release a preset control rod group according to the rapid power reduction rod group combination corresponding to different load shedding transient processes, until the power reduction amplitude of the rapid power reduction system reaches a first power reduction amplitude.

[0048] In the embodiment of the present invention, different combinations of rapid power reduction rod groups are pre-set for the load shedding transient process, and the preset control rod groups are released according to the rapid power reduction rod group combinations corresponding to different load shedding transients to quickly reduce the nuclear power, thereby ensuring that the sum of the power reduction amplitude of the rapid power reduction system and the capacity of the turbine bypass system is not less than the maximum load reduction amplitude when the load is shed to the plant power supply, thereby reducing the main steam production and the capacity requirements of the turbine bypass system.

[0049] In a specific implementation of the present invention, after the above S2, the nuclear power plant rapid power reduction method further includes S3 and S4. S1-3 is a specific implementation of the above S1.

[0050] S3: Use the analytical model to simulate the load shedding transient process, and analyze whether the protection signal, the atmospheric release valve opening signal or the steam generator safety valve opening signal is triggered during the load shedding transient process according to the simulation results of the load shedding transient process.

[0051] For example, by using the analytical model to simulate the transient process of load rejection, the analytical model can automatically calculate the changes of parameters such as reactor coolant temperature, pressure, nuclear power, and steam pressure over time. The analytical model can automatically calculate the negative change rate of the neutron injection rate from the nuclear power. If the absolute value of the negative change rate of the neutron injection rate is greater than the preset value of the negative change rate of the neutron injection rate (for example, 5% FP / 2s), a protection signal can be triggered. If the steam pressure is greater than the preset value of the steam pressure (for example, 7.5Mpa), the atmospheric release valve opening signal or the steam generator safety valve opening signal can be triggered.

[0052] S4: If any of the protection signal, the atmospheric relief valve opening signal, and the steam generator safety valve opening signal is triggered during the load shedding transient process, the power reduction amplitude of the rapid power reduction is increased to the second power reduction amplitude to ensure that any of the protection signal, the atmospheric relief valve opening signal, and the steam generator safety valve opening signal is no longer triggered during the load shedding transient process. The second power reduction amplitude is greater than the first power reduction amplitude. The sum of the second power reduction amplitude and the turbine bypass system capacity is not less than the maximum load reduction amplitude when the load is shed to the plant power supply.

[0053] S1-3: During the load shedding transient process, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches a second power reduction amplitude.

[0054] For example, by analyzing different load shedding transient processes, it is evaluated whether the protection signal, the atmospheric release valve opening signal or the steam generator safety valve opening signal is triggered during the load shedding transient process. If any of the above signals is triggered, the power reduction amplitude of the rapid power reduction is increased, and at the same time, the released control rod group or the start-up conditions of the rapid power reduction system are adjusted to make the released control rod group more valuable or trigger the rapid power reduction more quickly until the above signals are not triggered during the load shedding transient process.

[0055] The second power reduction amplitude is the sum of the first power reduction amplitude and at least one first preset step size. The first preset step size can be set according to actual needs, and the embodiment of the present invention does not specifically limit this. In some embodiments, the range of the first preset step size is 5% to 10%, for example, the first preset step size is 5%. In this way, by appropriately increasing the power reduction amplitude of the rapid power reduction, it is ensured that the above signal is not triggered during the load shedding transient process.

[0056] According to the technical solution provided by the embodiment of the present invention, by using the analytical model to analyze whether the protection signal, the atmospheric release valve opening signal or the steam generator safety valve opening signal is triggered during the load shedding transient process, that is, it is verified whether the above-mentioned S1 and S2 meet the load shedding transient demand. If any of the protection signal, the atmospheric release valve opening signal and the steam generator safety valve opening signal is triggered during the load shedding transient process (that is, the load shedding transient demand is not met), it is optimized by increasing the power reduction amplitude of the rapid power reduction, and at the same time, the start-up conditions of the rapid power reduction system are adjusted (corresponding to S1-3) so that the released control rod group has a greater value or triggers the rapid power reduction more quickly, until it is ensured that the above-mentioned signals are not triggered during the load shedding transient process, thereby ensuring that the rapid power reduction method of the nuclear power plant meets the load shedding transient demand.

[0057] In a specific implementation of the present invention, after the above S2, the nuclear power plant rapid power reduction method further includes S5 and S6. S1-4 is a specific implementation of the above S1.

[0058] S5: Use the analytical model to simulate the accident transient process, and analyze whether the steam pressure in the accident transient process is lower than the limit criterion based on the simulation results of the accident transient process.

[0059] It should be noted that the load shedding transient process is a normal transient process. The accident transient condition is a transient process when an accident occurs.

[0060] For example, if a certain restriction criterion sets the steam pressure not to exceed the design pressure of the secondary circuit system, then the above S5 can analyze whether the steam pressure during the accident transient process is lower than the design pressure of the secondary circuit system.

[0061] In a specific implementation of the present invention, the accident transient process is the loss of off-site power.

[0062] S6: If the steam pressure is not lower than the limit criterion during the accident transient, the power reduction range of the rapid power reduction is increased to the third power reduction range to ensure that the steam pressure is lower than the limit criterion during the accident transient. The third power reduction range is greater than the first power reduction range. The sum of the third power reduction range and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the plant power supply.

[0063] For example, the third power reduction range is the sum of the first power reduction range and at least one second preset step size. It should be noted that the second power reduction range and the third power reduction range may be the same or different. The first preset step size and the second preset step size may be the same or different.

[0064] S1-4: During the load shedding transient process, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches a third power reduction amplitude.

[0065] In the embodiment of the present invention, an analysis model is used to simulate the accident transient process, an overpressure analysis is performed on the accident transient operating conditions, and it is evaluated whether the steam pressure in the accident transient process is lower than the limit criterion (corresponding to S5). When the steam pressure does not meet the limit criterion requirements, the power reduction amplitude of the rapid power reduction is increased to the third power reduction amplitude (corresponding to S6), and at the same time, the start-up conditions of the rapid power reduction system are adjusted (corresponding to S1-4), thereby ensuring that the steam pressure in the accident transient process meets the limit criterion requirements.

[0066] At least one embodiment of the present invention further provides a rapid power reduction device for a nuclear power plant, which includes a starting module and a locking module. The starting module is used to start the rapid power reduction system to perform rapid power reduction during the load shedding transient process until the power reduction amplitude of the rapid power reduction system reaches a first power reduction amplitude. The sum of the first power reduction amplitude and the capacity of the turbine bypass system is not less than the maximum load reduction amplitude when the load is shed to the plant power supply. The locking module is used to lock the neutron injection rate negative change rate shutdown protection when starting the rapid power reduction system.

[0067] It should be noted that the nuclear power plant rapid power reduction device is a device corresponding to the nuclear power plant rapid power reduction method in the above-mentioned embodiment, includes the corresponding technical features of the nuclear power plant rapid power reduction method in the above-mentioned embodiment, and can achieve the corresponding technical effects, which will not be repeated here.

[0068] At least one embodiment of the present invention further provides a computer device, which includes a processor and a memory. The processor is used to execute a method for rapid power reduction of a nuclear power plant provided by any of the above embodiments of the present invention. The memory is used to store executable instructions of the processor, such as an application program. The number of processors can be one or more. The application program stored in the memory can include one or more modules, each corresponding to a set of instructions. In addition, the processor is configured to execute instructions to execute the above method for rapid power reduction of a nuclear power plant.

[0069] The computer device may also include a power supply component configured to manage power of the computer device, 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 may operate based on an operating system stored in the memory, such as Windows Server™, Mac OSX™, Unix™, Linux™, FreeBSD™ or the like.

[0070] At least one embodiment of the present invention further provides a computer-readable storage medium on which executable instructions of a computer are stored. When the executable instructions are executed by a processor, a method for rapid power reduction of a nuclear power plant provided by any of the above embodiments of the present invention is implemented.

[0071] 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 execute the nuclear power plant rapid power reduction method. The nuclear power plant rapid power reduction method is executed by an agent program.

[0072] Those skilled in the art will appreciate that the algorithm steps of each example described in conjunction with the embodiments disclosed in the present invention can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0073] At least one embodiment of the present invention further provides a computer program product, including a computer program / instruction, which, when executed by a processor, implements a method for rapid power reduction of a nuclear power plant provided by any of the above embodiments of the present invention.

[0074] If the above functions are implemented in the form of 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 the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a computer program product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the nuclear power plant rapid power reduction method of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program check codes.

[0075] It should be noted that the combination of the various technical features in the embodiments of the present invention is not limited to the combination recorded in the embodiments of the present invention or the combination recorded in the specific embodiments, and all technical features recorded in the present invention can be freely combined or combined in any way unless there is a contradiction between them.

[0076] As shown in the present invention and claims, unless the context clearly indicates an exception, the words "a", "an" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the term "comprising" only indicates that the steps and elements that have been clearly identified are included, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0077] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0078] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0079] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for rapid power reduction of a nuclear power plant, characterized in that: include: During the load shedding transient process, the rapid power reduction system is started to rapidly reduce power until the power reduction range of the rapid power reduction system reaches the first power reduction range, and the sum of the first power reduction range and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the auxiliary power supply; When the rapid power reduction system is started, the negative change rate of neutron injection rate is locked to shut down the reactor protection.

2. The method for rapid power reduction of a nuclear power plant according to claim 1, characterized in that: The maximum load reduction when shedding load to plant power is not greater than 85%, and / or the turbine bypass system capacity is 50%.

3. The method for rapid power reduction of a nuclear power plant according to claim 1, characterized in that: Also includes: During the load shedding transient process, determine whether the load shedding amplitude is less than the turbine bypass system capacity; If the magnitude of load shedding is less than the capacity of the turbine bypass system, the rapid power reduction system will not be triggered to perform rapid power reduction; The method of starting the rapid power reduction system to rapidly reduce power during the load shedding transient process until the power reduction range of the rapid power reduction system reaches a first power reduction range includes: If the load shedding amplitude is not less than the turbine bypass system capacity, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches the first power reduction amplitude.

4. The method for rapid power reduction of a nuclear power plant according to claim 1, characterized in that: Also includes: Determine a plurality of rapid power reduction rod group combinations according to the arrangement of the reactor control rod groups and the rod group values, wherein the number of rod groups in the rapid power reduction rod group combinations is less than the number of rod groups in the reactor control rod group; According to the values ​​of multiple combinations of rapid power reduction rod groups, determine the combination of rapid power reduction rod groups when the rapid power reduction system is rapidly reduced under different load shedding transients, so that the sum of the power reduction range of the rapid power reduction system and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the plant power supply; The method of starting the rapid power reduction system to rapidly reduce power during the load shedding transient process until the power reduction range of the rapid power reduction system reaches a first power reduction range includes: During different load shedding transient processes, the rapid power reduction system is started and controlled to release the preset control rod group according to the rapid power reduction rod group combination corresponding to different load shedding transient processes until the power reduction amplitude of the rapid power reduction system reaches the first power reduction amplitude.

5. The method for rapid power reduction of a nuclear power plant according to claim 1, characterized in that: Also includes: The load shedding transient process is simulated by using the analytical model, and whether the protection signal, the atmospheric release valve opening signal or the steam generator safety valve opening signal is triggered during the load shedding transient process is analyzed according to the simulation results of the load shedding transient process; If any of the protection signal, the atmospheric release valve opening signal and the steam generator safety valve opening signal is triggered during the load shedding transient process, the power reduction amplitude of the rapid power reduction is increased to the second power reduction amplitude to ensure that any of the protection signal, the atmospheric release valve opening signal and the steam generator safety valve opening signal is no longer triggered during the load shedding transient process, the second power reduction amplitude is greater than the first power reduction amplitude, and the sum of the second power reduction amplitude and the turbine bypass system capacity is not less than the maximum load reduction amplitude when the load is shed to the plant power supply; The method of starting the rapid power reduction system to rapidly reduce power during the load shedding transient process until the power reduction range of the rapid power reduction system reaches a first power reduction range includes: During the load shedding transient process, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches a second power reduction amplitude.

6. The method for rapid power reduction of a nuclear power plant according to claim 5, characterized in that: The second power reduction amplitude is the sum of the first power reduction amplitude and at least one first preset step length.

7. The method for rapid power reduction of a nuclear power plant according to claim 6, characterized in that: The first preset step size ranges from 5% to 10%.

8. The method for rapid power reduction of a nuclear power plant according to any one of claims 1 to 7, characterized in that: Also includes: The accident transient process is simulated by using the analytical model, and whether the steam pressure in the accident transient process is lower than the limit criterion is analyzed according to the simulation results of the accident transient process; If the steam pressure is not lower than the limit criterion during the accident transient process, the power reduction range of the rapid power reduction is increased to the third power reduction range to ensure that the steam pressure is lower than the limit criterion during the accident transient process, the third power reduction range is greater than the first power reduction range, and the sum of the third power reduction range and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the plant power supply; The method of starting the rapid power reduction system to rapidly reduce power during the load shedding transient process until the power reduction range of the rapid power reduction system reaches a first power reduction range includes: During the load shedding transient process, the rapid power reduction system is started to perform rapid power reduction until the power reduction amplitude of the rapid power reduction system reaches a third power reduction amplitude.

9. The method for rapid power reduction of a nuclear power plant according to claim 8, characterized in that: The third power reduction amplitude is the sum of the first power reduction amplitude and at least one second preset step length.

10. The method for rapid power reduction of a nuclear power plant according to claim 8, characterized in that: The transient process of the accident is the loss of external power.

11. A rapid power reduction device for a nuclear power plant, characterized in that: Including starting module and locking module, The start-up module is used to start the rapid power reduction system to rapidly reduce power during the load shedding transient process, until the power reduction range of the rapid power reduction system reaches a first power reduction range, and the sum of the first power reduction range and the capacity of the turbine bypass system is not less than the maximum load reduction range when the load is shed to the plant power supply; The locking module is used to lock the neutron injection rate negative change rate shutdown protection when starting the rapid power reduction system.

12. A computer device, characterized in that: include: A processor, configured to execute a method for rapid power reduction of a nuclear power plant according to any one of claims 1 to 10; as well as A memory is used to store executable instructions of the processor.

13. A computer-readable storage medium having computer executable instructions stored thereon, characterized in that: When the executable instructions are executed by the processor, a method for rapid power reduction of a nuclear power plant according to any one of claims 1 to 10 is implemented.

14. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, a method for rapid power reduction of a nuclear power plant according to any one of claims 1 to 10 is implemented.

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