A sodium-cooled fast reactor cascade control system and method

Abstract

This invention discloses a cascade control system and method for a sodium-cooled fast reactor, belonging to the field of nuclear reactor engineering technology. It includes a core, an intermediate heat exchanger, and a steam generator. The core control system includes the regulation of control rods and the primary sodium pump speed, while the intermediate heat exchanger control system includes the regulation of the secondary sodium pump speed. In the sodium-cooled fast reactor core, the control rod speed signal uses a cascade control method to control power and regulate the outlet temperature. The primary sodium pump speed is regulated using cooling flow feedback. In the intermediate heat exchanger, the secondary sodium pump speed signal uses a cascade control method to control the secondary loop flow and regulate the IHX secondary side inlet temperature. This invention improves the automation level of the sodium-cooled fast reactor, significantly reduces the workload of operators, and gives the sodium-cooled fast reactor better dynamic response quality and ideal regulation characteristics.

Description

Technical Field

[0001] This invention belongs to the field of nuclear reactor engineering technology, specifically relating to a sodium-cooled fast reactor cascade control system and method. Background Technology

[0002] A sodium-cooled fast reactor (SDR) is a reactor that uses liquid metallic sodium as a coolant and primarily relies on fast neutrons to induce nuclear fission and sustain a chain reaction. Fast neutrons are high-energy neutrons with high velocity within the reactor core. Because of the high velocity of neutrons in a fast reactor, the ratio of absorption cross-section to fission cross-section is significantly reduced, and the number of neutrons produced per fission cycle is significantly increased. Therefore, fast reactors have better neutron economy, resulting in more surplus neutrons being captured and absorbed by uranium-238, which then decays into plutonium-239 through two decay cycles.

[0003] Currently, there are two main control modes for sodium-cooled fast reactors: one is the reactor-following-the-reactor control mode, which adjusts the core power through control rods to reach the reference power, and then controls the tertiary loop load by controlling the power response of the primary and secondary loop temperatures. This mode lacks system flexibility. The other is the reactor-following-the-reactor control mode, which adjusts the control rods according to the load demand of the tertiary loop, thereby changing the power levels and temperature of the primary and secondary loops. However, this method has limited ability to cope with transients of large and rapid changes in the tertiary loop load.

[0004] The China Experimental Fast Reactor (CEFR) is my country's first fast neutron reactor, a pool-type sodium-cooled fast neutron reactor. Its designed thermal power is 65 MW, with an experimental power output of 20 MW. CEFR's primary loop adopts a pool-type structure, also known as an integrated layout. Liquid metallic sodium serves as the coolant in the primary loop and the heat transfer fluid in the secondary loop. The core and primary loop equipment are all installed within the main vessel (sodium pool). Its primary control method is the CEFR power regulation system, which controls power by controlling reactivity. The control rods in CEFR are driven by stepper motors to change their position within the core. Subsequently, the power response to temperature is used to control the load of subsequent loops.

[0005] The aforementioned CEFR control mode employs reactor-following-reactor (CFRT) operation. This mode lacks sufficient system flexibility, cannot adapt to changes in the load across the three circuits, and is unsuitable for peak shaving in response to shifts in grid demand. Therefore, proposing a novel control method for sodium-cooled fast reactor systems, enabling them to meet reactor-following-reactor requirements, is essential. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a sodium-cooled fast reactor cascade control system and method to address the shortcomings of the prior art. By using the three-loop load as a reference signal, the reactor power can follow its load level. Through a series of controller responses, the sodium-cooled fast reactor can meet the reactor-machine requirements under the premise of safe operation. This invention is used to solve the technical problem that the current sodium-cooled fast reactor is not flexible enough and cannot adapt to future grid-connected power generation.

[0007] The present invention adopts the following technical solution:

[0008] A sodium-cooled fast reactor cascade control system includes a reactor core section, which is connected to a steam generator section via an intermediate heat exchanger section.

[0009] The core section includes a sodium-cooled fast reactor core, and the input terminals of the sodium-cooled fast reactor core are respectively connected to the core inlet temperature, control rod speed and core inlet flow rate;

[0010] The output of the sodium-cooled fast reactor core is divided into three paths: one path is connected to the power controller for feedback of reactor power, the second path is connected to the intermediate heat exchanger section II for feedback of core outlet flow, and the third path is divided into two paths: one path is connected to the intermediate heat exchanger section II, and the other path is connected to the power controller via the core outlet temperature controller for feedback of core outlet temperature.

[0011] The intermediate heat exchanger section includes an intermediate heat exchanger, whose output is divided into three paths. One path outputs the core inlet temperature, and the remaining two paths output the IHX secondary side outlet temperature signal and the IHX secondary side outlet flow signal to the steam generator section, respectively.

[0012] Preferably, the input end of the sodium-cooled fast reactor core is divided into three paths: one path is connected to the intermediate heat exchanger section II to obtain the core inlet temperature; the second path is connected to the power controller to obtain the control rod speed; and the third path is connected to the primary loop flow controller via a primary sodium pump to obtain the core inlet flow rate.

[0013] Preferably, the input end of the intermediate heat exchanger is divided into four paths. The first and second paths are connected to the output end of the sodium-cooled fast reactor core to obtain the core outlet temperature and core outlet flow rate. The third path is connected to the secondary sodium pump to obtain the IHX secondary side inlet flow rate. The fourth path is connected to the steam generator of steam generator section III to obtain the IHX secondary side inlet temperature.

[0014] Preferably, the output of the steam generator is divided into two paths: one path is connected to the input of the intermediate heat exchanger to provide feedback on the inlet temperature of the IHX secondary side; the other path is connected to the input of the intermediate heat exchanger via a secondary loop temperature controller, a secondary loop flow controller, and a secondary sodium pump; the output of the secondary sodium pump is connected to the input of the secondary loop flow controller.

[0015] Preferably, the core outlet temperature controller, the secondary loop temperature controller, and the secondary loop flow controller are proportional-integral controllers.

[0016] Preferably, the input end of the steam generator is connected to the feedwater inlet boundary to acquire feedwater flow rate and feedwater temperature signals; the output end of the steam generator is connected to the steam outlet boundary to provide feedback steam temperature and steam flow rate signals.

[0017] Preferably, the power controller is a proportional-derivative controller.

[0018] Secondly, embodiments of the present invention provide a sodium-cooled fast reactor cascade control method, which includes the following steps:

[0019] When the turbine load changes, the core outlet temperature signal is acquired, and the deviation between it and the core reference outlet temperature signal is sent to the core outlet temperature controller. The reference power signal is added to the output of the core outlet temperature controller to obtain the reference input signal of the power controller, forming a cascade control, which is formed by the core outlet temperature controller and the power controller connected in series.

[0020] After obtaining the deviation between the power signal and the reference input signal of the power controller, it is sent to the power controller, and the control rod speed signal is input into the sodium-cooled fast reactor core. The deviation between the core inlet flow signal and the core reference inlet flow signal is obtained and sent to the primary loop flow controller to obtain the pump speed signal of the primary sodium pump. The primary sodium pump inputs the obtained core inlet flow signal into the sodium-cooled fast reactor core through the pump speed signal.

[0021] The IHX secondary side inlet temperature signal is acquired, and the deviation between it and the IHX secondary side reference inlet temperature signal is sent to the secondary loop temperature controller. The IHX secondary side reference inlet flow signal is added to the output of the secondary loop temperature controller to obtain the reference input signal of the secondary loop flow controller, forming a cascade control, which is formed by the series connection of the secondary loop temperature controller and the secondary loop flow controller.

[0022] After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller, the signal is sent to the secondary loop flow controller to obtain the pump speed signal of the secondary sodium pump. The secondary sodium pump obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator. The feedwater flow signal and feedwater temperature signal are sent into the steam generator from the feedwater inlet boundary, and the sodium-cooled fast reactor core, primary sodium pump, secondary sodium pump and steam generator are regulated.

[0023] Preferably, when the turbine load changes, the feedwater flow rate signal and feedwater temperature signal change, and then the reference power signal, core reference outlet temperature signal, core reference inlet flow rate signal, IHX secondary side reference inlet flow rate signal and IHX secondary side reference inlet temperature signal change accordingly according to the steam flow rate, while the core reference outlet signal remains unchanged.

[0024] Preferably, the speed signal output by the secondary flow controller adopts a cascade control method to control the inlet flow of the IHX secondary side and adjust the inlet temperature of the IHX secondary side.

[0025] Thirdly, a computer device includes 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 sodium-cooled fast reactor cascade control method.

[0026] Fourthly, embodiments of the present invention provide a computer-readable storage medium including a computer program, which, when executed by a processor, implements the steps of the above-described sodium-cooled fast reactor cascade control method.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] A sodium-cooled fast reactor cascade control system is divided into three loops according to the common layout of sodium-cooled fast reactors: the core section (I), the intermediate heat exchanger section (II), the steam generator section (III), and the subsequent heat-to-work conversion device. The intermediate heat exchanger section (II) is used to isolate the large amount of liquid sodium in the core section (I) from the water in the steam generator section (III) to prevent a violent sodium-water reaction that could endanger reactor safety.

[0029] Furthermore, the input signals to the reactor core are the core inlet temperature, control rod speed, and core inlet flow rate. The corresponding power, core outlet temperature, and core outlet flow rate can be calculated from these three signals. Among them, the power signal is fed back to the core power controller, while the core outlet temperature and core outlet flow rate serve as input signals for the next loop.

[0030] Furthermore, the input signals for the intermediate heat exchanger are the core outlet temperature, core outlet flow rate, IHX secondary side inlet flow rate, and IHX secondary side inlet temperature. The intermediate heat exchanger can calculate the corresponding core inlet temperature, IHX secondary side outlet temperature, and IHX secondary side outlet flow rate signals from these four values. The core inlet temperature is used as a primary loop signal fed back to the core, while the other two are used as input signals for the next loop.

[0031] Furthermore, the input signals to the steam generator are feedwater flow rate, feedwater temperature, IHX secondary side outlet temperature, and IHX secondary side outlet flow rate. The steam generator can calculate the corresponding steam temperature, steam flow rate, and IHX secondary side inlet temperature based on these four signals. Among them, the IHX secondary side inlet temperature is fed back to the intermediate heat exchanger as a secondary loop signal, while the other two are directly used as output signals to the outlet boundary.

[0032] Furthermore, the power controller is a proportional-derivative controller because the controller's output signal, which controls the rod speed signal, will undergo an integral operation in the reactor core to convert it into reactivity. Therefore, the controller here only needs to be set as a proportional-derivative controller.

[0033] A cascade control method for a sodium-cooled fast reactor includes a cascade control system for regulating core outlet temperature by controlling power, a cascade control system for regulating IHX secondary side inlet temperature by controlling IHX secondary side inlet flow, and a main loop flow control system. The two cascade control systems decompose the control task into two levels, each focusing on its own control objective. While satisfying the primary objective, they also strive to ensure good response to secondary objectives, significantly improving the system's control accuracy, stability, dynamic performance, and robustness. This hierarchical control strategy enables the system to better cope with complex operating conditions and disturbances, improving overall performance and reliability.

[0034] In summary, the method of the present invention enables the reactor power to follow its load level and, through a series of controller responses, ensures that the sodium-cooled fast reactor meets the reactor-following requirements under the premise of safe operation, thereby reducing the skill requirements of operators.

[0035] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the primary, secondary, and tertiary loop systems of a sodium-cooled fast reactor.

[0037] Figure 2 This is a schematic diagram of the control system of the present invention;

[0038] Figure 3 The graph shows the control results for relative nuclear power;

[0039] Figure 4 This is a graph showing the control results of the core outlet temperature.

[0040] Figure 5 The graph shows the control results of the IHX secondary side inlet temperature.

[0041] Figure 6 A schematic diagram of a computer device provided in an embodiment of the present invention;

[0042] Figure 7 This is a block diagram of an electronic device according to an embodiment of the present invention.

[0043] The components are: I. Core section; II. Intermediate heat exchanger section; III. Steam generator section; 1. Sodium-cooled fast reactor core; 2. Intermediate heat exchanger; 3. Steam generator; 4. Primary sodium pump; 5. Secondary sodium pump; 6. Feedwater inlet boundary; 7. Steam outlet boundary; 8. Core outlet temperature controller; 9. Power controller; 10. Primary loop flow controller; 11. Secondary loop temperature controller; 12. Secondary loop flow controller; 13. Core inlet temperature; 14. Control rod speed; 15. Core inlet flow rate; 16. Reverse 17. Core outlet temperature; 18. Core outlet flow rate; 19. IHX secondary side outlet temperature; 20. IHX secondary side outlet flow rate; 21. Feedwater flow rate; 22. Feedwater temperature; 23. Steam temperature; 24. Steam flow rate; 25. IHX secondary side inlet temperature; 26. IHX secondary side inlet flow rate; 27. IHX secondary side reference inlet temperature; 28. IHX secondary side reference inlet flow rate; 29. ​​Core reference outlet temperature; 30. Power reference value; 31. Core reference inlet flow rate. Detailed Implementation

[0044] 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.

[0045] In the description of this invention, it should be understood that the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0046] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0047] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this invention generally indicates that the preceding and following objects have an "or" relationship.

[0048] It should be understood that although terms such as first, second, third, etc., may be used in the embodiments of the present invention to describe the preset range, these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from one another. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0049] Depending on the context, the word "if" as used here can be interpreted as "when," "when," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if determination" or "if detection (of the stated condition or event)" can be interpreted as "when determination," "in response to determination," "when detection (of the stated condition or event)," or "in response to detection (of the stated condition or event)."

[0050] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0051] This invention provides a cascade control method for a sodium-cooled fast reactor. In the core of the sodium-cooled fast reactor, the control rod speed signal is controlled by a cascade control method to regulate the outlet temperature by controlling the power output. The primary sodium pump speed is regulated by feedback of the cooling flow rate. In the intermediate heat exchanger, the secondary sodium pump speed signal is controlled by a cascade control method to regulate the secondary loop flow rate and adjust the inlet temperature of the IHX secondary side. This method improves the automation level of the sodium-cooled fast reactor, significantly reduces the workload of operators, and gives the sodium-cooled fast reactor better dynamic response quality, achieving ideal regulation characteristics.

[0052] Please see Figure 2This invention discloses a sodium-cooled fast reactor cascade control system, comprising: a core section I, an intermediate heat exchanger section II, and a steam generator section III. The core section I is connected to the intermediate heat exchanger section II and the steam generator section III. Since direct contact between sodium and water may lead to violent chemical reactions (such as the reaction of sodium with water to produce hydrogen and sodium hydroxide), the presence of the intermediate heat exchanger section II achieves both heat exchange between the core and subsequent loops and physical isolation between the sodium pool and water, ensuring the safety of the reactor. The steam generator section III is used to heat the feedwater with heat transferred from the core. The water is heated and converted into high-temperature and high-pressure steam, thereby driving the steam turbine, which in turn drives the generator to generate electricity.

[0053] Core section I includes sodium-cooled fast reactor core 1, primary sodium pump 4, core outlet temperature controller 8, power controller 9, and primary loop flow controller 10;

[0054] The input signals for sodium-cooled fast reactor core 1 include core inlet temperature 13, control rod speed 14, and core inlet flow rate 15;

[0055] Intermediate heat exchanger 2 is connected to sodium-cooled fast reactor core 1 and is used to input core inlet temperature 13 into sodium-cooled fast reactor core 1.

[0056] The power controller 9 is connected to the sodium-cooled fast reactor core 1 and is used to input the control rod speed 14 into the sodium-cooled fast reactor core 1;

[0057] The core reference inlet flow rate 31 is connected to the sodium-cooled fast reactor core 1 via the primary loop flow controller 10 and the primary sodium pump 4, and is used to input the core inlet flow rate 15 into the sodium-cooled fast reactor core 1.

[0058] The output signals of sodium-cooled fast reactor core 1 include reactor power 16, core outlet temperature 17, and core outlet flow rate 18;

[0059] The sodium-cooled fast reactor core 1 is connected to the intermediate heat exchanger 2, the core outlet temperature controller 8, and the power controller 9. The core outlet temperature 17 and the core outlet flow rate 18 are input to the intermediate heat exchanger 2, and the core outlet temperature 17 and the core reference outlet temperature 29 are sent to the core outlet temperature controller 8. The core outlet temperature controller 8 sends the data of the added power reference value 30 and the reactor power 16 to the power controller 9.

[0060] The input signal of the primary sodium pump 4 is the rotational speed signal output from the primary loop flow controller 10, and the output signal of the primary sodium pump is the core inlet flow signal 15.

[0061] The control rod signal 14 adopts a cascade control method, and the control power 16 adjusts the core outlet temperature 17.

[0062] The deviation between the core outlet temperature 17 and the core reference outlet temperature 29 is sent to the core outlet temperature controller 8.

[0063] The power reference value 30 and the output signal of the core outlet temperature controller 8 are added together, and the deviation from the reactor power 16 is sent to the power controller 9 to output the control rod speed 14.

[0064] The deviation between the core inlet flow rate 15 and the core reference inlet flow rate 31 is obtained and sent to the primary loop flow controller 10, which outputs the pump speed signal of the primary sodium pump.

[0065] The power reference value 30, the core reference outlet signal 29, and the core reference inlet flow rate 31 are determined based on the turbine load.

[0066] Intermediate heat exchanger section II includes intermediate heat exchanger 2, secondary sodium pump 5, secondary loop temperature controller 11, and secondary loop flow controller 12.

[0067] The output end of the intermediate heat exchanger 2 is connected to the input end of the intermediate heat exchanger 2 via the steam generator 3 of the steam generator section III, which is connected in sequence to the secondary loop temperature controller 11, the secondary loop flow controller 12, and the secondary sodium pump 5.

[0068] The input signals of the intermediate heat exchanger 2 are the core outlet flow rate signal 18, the core outlet temperature signal 17, the IHX secondary side inlet flow rate signal 26, and the IHX secondary side inlet temperature signal 27, respectively; the output signals of the intermediate heat exchanger are the core inlet temperature signal 13, the IHX secondary side outlet flow rate signal 20, and the IHX secondary side outlet temperature signal 19, respectively; the input signal of the secondary sodium pump 5 is the speed signal output from the secondary loop flow controller 12, and the output signal of the secondary sodium pump is the IHX secondary side inlet flow rate signal 26;

[0069] The speed signal output by the second-loop flow controller 12 adopts a cascade control method to control the inlet flow 26 of the secondary side of IHX and adjust the inlet temperature 25 of the secondary side of IHX.

[0070] The deviation between the IHX secondary side inlet temperature signal 25 and the IHX secondary side reference inlet temperature signal 27 is sent to the second-loop temperature controller 11.

[0071] After the IHX secondary side reference inlet flow signal 28 and the output signal of the secondary loop temperature controller 11 are added together, the deviation from the IHX secondary side inlet flow signal 26 is sent to the secondary loop flow controller 12 and outputs the speed signal to the secondary sodium pump 5, and outputs the IHX secondary side inlet flow 26.

[0072] The IHX secondary side reference inlet flow signal 28 and the IHX secondary side reference inlet temperature signal 27 are determined based on the turbine load.

[0073] The steam generator section III includes the steam generator 3, the feedwater inlet boundary 6, and the steam outlet boundary 7.

[0074] The input end of the steam generator 3 is connected to the feedwater inlet boundary 6, and the output end is connected to the steam outlet boundary 7.

[0075] The input signals of the DC steam generator 3 are feedwater flow signal 21, IHX secondary side outlet flow signal 20, IHX secondary side outlet temperature signal 19, and feedwater temperature signal 22, respectively. The output signals of the DC steam generator are IHX secondary side inlet temperature signal 25, steam temperature signal 23, and steam flow signal 24, respectively. The output signals of the feedwater inlet boundary are feedwater flow signal 21 and feedwater temperature signal 22, respectively. The input signals of the steam boundary are steam flow signal 24 and steam temperature signal 23.

[0076] The feedwater flow rate signal 21 and the feedwater temperature signal 22 are determined according to the load of the steam turbine;

[0077] All the above input signals indicate that they have an impact on the relevant object, and all output signals come from the relevant signals obtained by the relevant sensors.

[0078] This invention discloses a sodium-cooled fast reactor cascade control method, comprising the following steps:

[0079] S1. When the turbine load changes, the feedwater flow signal 21 and feedwater temperature signal 22 change first. Then the reference power signal 30, core reference outlet temperature signal 29, core reference inlet flow signal 31, IHX secondary side reference inlet flow signal 28 and IHX secondary side reference inlet temperature signal 27 will change accordingly according to the change in steam flow. The core reference outlet signal 29 remains unchanged.

[0080] The core outlet temperature controller 8 adopts a proportional-integral controller.

[0081] S2. Obtain the core outlet temperature signal 17 and the deviation between it and the core reference outlet temperature signal 29, and send it to the core outlet temperature controller 9.

[0082] S3. The reference power signal 30 is added to the output of the core outlet temperature controller 8 to obtain the reference input signal of the power controller 9, forming a cascade control, which is formed by the series connection of the core outlet temperature controller 8 and the power controller 9.

[0083] The power controller 9 is a proportional-derivative controller. This is because the control rod speed signal 14 is integrated once in the core 1 to obtain the control rod insertion depth, that is, the transformation of the differential value of the control rod to the integral value. Therefore, the power controller does not need an integral element to eliminate steady-state error, and reactive control can be achieved solely through the proportional-derivative controller.

[0084] S4. After obtaining the deviation between the power signal 16 and the reference input signal of the power controller 9, the signal is sent to the power controller 9, and the control rod speed signal 14 is obtained and input into the sodium-cooled fast reactor core 1.

[0085] S5. Obtain the deviation between the core inlet flow signal 15 and the core reference inlet flow signal 31 and send it to the primary loop flow controller to obtain the pump speed signal of the primary sodium pump 4.

[0086] The dual-loop temperature controller 11 adopts a proportional-integral controller.

[0087] S6. The primary sodium pump 4 obtains the core inlet flow signal 15 through the pump speed signal and inputs it into the sodium-cooled fast reactor core 1.

[0088] S7. Obtain the deviation between the IHX secondary side inlet temperature signal 25 and the IHX secondary side reference inlet temperature signal 27 and send it to the second-loop temperature controller 11.

[0089] The dual-loop flow controller 12 adopts a proportional-integral controller.

[0090] S8, the secondary side reference inlet flow signal 28 of IHX is added to the output of the secondary loop temperature controller 11 to obtain the reference input signal of the secondary loop flow controller 12, forming a cascade control, which is formed by the series connection of the secondary loop temperature controller 11 and the secondary loop flow controller 12.

[0091] S9. After obtaining the deviation between the IHX secondary side inlet flow signal 26 and the reference input signal of the secondary loop flow controller 12, the signal is sent to the secondary loop flow controller 12 to obtain the pump speed signal of the secondary sodium pump 5.

[0092] S10, the secondary sodium pump 5 obtains the IHX secondary side inlet flow signal 26 through the pump speed signal and inputs it into the steam generator 3;

[0093] S11, the feedwater flow signal 21 and the feedwater temperature signal 22 are sent into the steam generator 3 from the feedwater inlet boundary 6.

[0094] The sodium-cooled fast reactor core 1, primary sodium pump 4, secondary sodium pump 5, and steam generator 3 are regulated.

[0095] Those skilled in the art will understand that various aspects of the present invention can be implemented as systems, methods, or program products. Therefore, various aspects of the present invention can be specifically implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software aspects, collectively referred to herein as a "circuit," "module," or "platform."

[0096] In another embodiment of the present invention, a terminal device is provided, comprising a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may 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. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions to achieve a corresponding method flow or corresponding function. The processor described in this embodiment of the present invention can be used for the operation of a sodium-cooled fast reactor cascade control method, including:

[0097] When the turbine load changes, the core outlet temperature signal is acquired, and the deviation between it and the core reference outlet temperature signal is sent to the core outlet temperature controller. The reference power signal is added to the output of the core outlet temperature controller to obtain the reference input signal of the power controller, forming a cascade control, which is formed by the core outlet temperature controller and the power controller connected in series.

[0098] After obtaining the deviation between the power signal and the reference input signal of the power controller, it is sent to the power controller, and the control rod speed signal is input into the sodium-cooled fast reactor core. The deviation between the core inlet flow signal and the core reference inlet flow signal is obtained and sent to the primary loop flow controller to obtain the pump speed signal of the primary sodium pump. The primary sodium pump inputs the obtained core inlet flow signal into the sodium-cooled fast reactor core through the pump speed signal.

[0099] The IHX secondary side inlet temperature signal is acquired, and the deviation between it and the IHX secondary side reference inlet temperature signal is sent to the secondary loop temperature controller. The IHX secondary side reference inlet flow signal is added to the output of the secondary loop temperature controller to obtain the reference input signal of the secondary loop flow controller, forming a cascade control, which is formed by the series connection of the secondary loop temperature controller and the secondary loop flow controller.

[0100] After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller, the signal is sent to the secondary loop flow controller to obtain the pump speed signal of the secondary sodium pump. The secondary sodium pump obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator. The feedwater flow signal and feedwater temperature signal are sent into the steam generator from the feedwater inlet boundary, and the sodium-cooled fast reactor core, primary sodium pump, secondary sodium pump and steam generator are regulated.

[0101] In another embodiment of the present invention, a storage medium is provided, specifically a computer-readable storage medium, which is a memory device in a terminal device for storing programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the terminal device and extended storage media supported by the terminal device; it can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, the storage space also stores one or more instructions suitable for loading and execution by a processor, which can be one or more computer programs. It should be noted that more specific examples (a non-exhaustive list) of the computer-readable storage medium include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination of the foregoing.

[0102] Computer-readable storage media also include data signals propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals can take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable storage medium can also be any readable medium other than a readable storage medium that can send, propagate, or transmit a program for use by or in connection with an instruction execution system, apparatus, or device. The program code contained on the readable storage medium can be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0103] Program code for performing the operations of this invention can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0104] One or more instructions stored in a computer-readable storage medium can be loaded and executed by a processor to implement the corresponding steps of the sodium-cooled fast reactor cascade control method in the above embodiments; one or more instructions in the computer-readable storage medium are loaded and executed by the processor to perform the following steps:

[0105] When the turbine load changes, the core outlet temperature signal is acquired, and the deviation between it and the core reference outlet temperature signal is sent to the core outlet temperature controller. The reference power signal is added to the output of the core outlet temperature controller to obtain the reference input signal of the power controller, forming a cascade control, which is formed by the core outlet temperature controller and the power controller connected in series.

[0106] After obtaining the deviation between the power signal and the reference input signal of the power controller, it is sent to the power controller, and the control rod speed signal is input into the sodium-cooled fast reactor core. The deviation between the core inlet flow signal and the core reference inlet flow signal is obtained and sent to the primary loop flow controller to obtain the pump speed signal of the primary sodium pump. The primary sodium pump inputs the obtained core inlet flow signal into the sodium-cooled fast reactor core through the pump speed signal.

[0107] The IHX secondary side inlet temperature signal is acquired, and the deviation between it and the IHX secondary side reference inlet temperature signal is sent to the secondary loop temperature controller. The IHX secondary side reference inlet flow signal is added to the output of the secondary loop temperature controller to obtain the reference input signal of the secondary loop flow controller, forming a cascade control, which is formed by the series connection of the secondary loop temperature controller and the secondary loop flow controller.

[0108] After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller, the signal is sent to the secondary loop flow controller to obtain the pump speed signal of the secondary sodium pump. The secondary sodium pump obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator. The feedwater flow signal and feedwater temperature signal are sent into the steam generator from the feedwater inlet boundary, and the sodium-cooled fast reactor core, primary sodium pump, secondary sodium pump and steam generator are regulated.

[0109] Please see Figure 6 The terminal device is a computer device. In this embodiment, the computer device 60 includes a processor 61, a memory 62, and a computer program 63 stored in the memory 62 and executable on the processor 61. When executed by the processor 61, the computer program 63 implements the fluid composition calculation method in the reservoir stimulation wellbore of this embodiment. To avoid repetition, these details are not elaborated here. Alternatively, when executed by the processor 61, the computer program 63 implements the functions of each model / unit in the sodium-cooled fast reactor cascade control system of this embodiment. To avoid repetition, these details are not elaborated here.

[0110] Computer device 60 can be a desktop computer, laptop, handheld computer, cloud server, or other computing device. Computer device 60 may include, but is not limited to, a processor 61 and a memory 62. Those skilled in the art will understand that... Figure 6 This is merely an example of computer device 60 and does not constitute a limitation on computer device 60. It may include more or fewer components than shown, or combine certain components, or different components. For example, computer device may also include input / output devices, network access devices, buses, etc.

[0111] The processor 61 may be a central processing unit (CPU), or other general-purpose processors, CPUs, graphics processing units (GPUs), 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, quantum computing-based data processing logic units, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0112] The memory 62 can be an internal storage unit of the computer device 60, such as a hard disk or RAM of the computer device 60. The memory 62 can also be an external storage device of the computer device 60, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on the computer device 60.

[0113] Furthermore, the memory 62 may include both internal storage units of the computer device 60 and external storage devices. The memory 62 is used to store computer programs and other programs and data required by the computer device. The memory 62 can also be used to temporarily store data that has been output or will be output.

[0114] Any references to memory, databases, or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory, magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory, magnetically variable memory, ferroelectric memory, phase-change memory, graphene memory, etc. Volatile memory may include random access memory or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory or dynamic random access memory, etc.

[0115] The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0116] Please see Figure 7 The terminal device 600 is an electronic device, which takes the form of a general-purpose computing device. The components of the electronic device may include, but are not limited to: at least one processing unit 610, at least one storage unit 620, a bus 630 connecting different platform components (including storage unit 620 and processing unit 610), a display unit 640, etc.

[0117] The storage unit stores program code, which can be executed by the processing unit 610 to perform the steps described in the method section of this specification according to various exemplary embodiments of the present invention. For example, the processing unit 610 can perform actions such as... Figure 1 The steps are shown in the figure.

[0118] Storage unit 620 may include a readable medium in the form of a volatile storage unit, such as random access memory (RAM) 6201 and / or cache memory 6202, and may further include a read-only memory (ROM) 6203.

[0119] Storage unit 620 may also include a program / utility 6204 having a set (at least one) program module 6205, such program module 6205 including but not limited to: operating system, one or more application programs, other program modules and program data, each or some combination of these examples may include an implementation of a network environment.

[0120] Bus 630 can represent one or more of several types of bus structures, including a memory cell bus or memory cell controller, a peripheral bus, a graphics acceleration port, a processing unit, or a local bus using any of the multiple bus structures.

[0121] Electronic device 600 can also communicate with one or more external devices 700 (e.g., keyboard, pointing device, Bluetooth device, etc.), and with one or more devices that enable a user to interact with electronic device 600, and / or with any device that enables electronic device 600 to communicate with one or more other computing devices (e.g., router, modem, etc.). This communication can be performed via input / output (I / O) interface 650. Furthermore, electronic device 600 can also communicate with one or more networks (e.g., local area network (LAN), wide area network (WAN), and / or public networks, such as the Internet) via network adapter 660. Network adapter 660 can communicate with other modules of electronic device 600 via bus 630. It should be understood that, although not shown in the figures, other hardware and / or software modules can be used in conjunction with electronic device 600, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage platforms.

[0122] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0123] After the turbine load changes, the above process is carried out sequentially, with each parameter adjusted and continuously changed until stability is achieved. Taking one sodium-cooled fast reactor as an example, at 500 seconds, the turbine load jumps from 100% to 90%, and then jumps back to 100% at 1000 seconds. The dynamic response of the sodium-cooled fast reactor is as follows: Figures 3 to 5 As shown, the details are as follows:

[0124] Figure 3 The reference power is the power required by the turbine as the core power changes with the turbine load. The reference power is the power required by the turbine as the load decreases from 100% to 90%. However, by using the control method in this invention, the actual power can be made to be basically the same as the reference power, thus achieving the goal of changing the core power with the required load.

[0125] Figure 4 To ensure that the core outlet temperature remains constant in the control method proposed in this invention, given the change in turbine load, the core outlet temperature should be kept constant to achieve optimal system thermal economy. Figure 4 As can be seen, after adopting the control method of the present invention, the core outlet temperature is well controlled during power step changes, and the change range is controlled within 0.2℃.

[0126] Figure 5 The secondary inlet temperature of the IHX varies with the turbine load. Controlling the IHX secondary inlet temperature is to ensure a stable temperature field in the entire system during power step changes, preventing sudden increases or decreases in flow rate. Figure 5 The actual curve of the secondary side of the IHX system roughly matches the reference curve, indicating the overall stability of the system.

[0127] As can be seen from the figure, after adopting the control method of the present invention, the sodium-cooled fast reactor has a short adjustment time, small overshoot, and good follow-turbine load effect.

[0128] The sodium-cooled fast reactor of this invention, as a fourth-generation advanced nuclear reactor type, has not yet been commercially deployed for grid-connected power generation. Therefore, various control methods for it are still in the design and verification stage. However, this invention adopts a reactor-following mode and controls both the primary and secondary loops. In the sodium-cooled fast reactor core, power deviation and core outlet temperature deviation are obtained sequentially, and the control rod speed is adjusted using a cascade control method; the primary sodium pump speed is adjusted using feedback from the core inlet flow rate. In the secondary loop, the IHX secondary side outlet temperature deviation and IHX inlet flow rate deviation are obtained sequentially, and the pump speed of the secondary sodium pump is adjusted using a cascade control method. This invention provides a cascade control method for sodium-cooled fast reactors, improving the automation level of sodium-cooled fast reactors, significantly reducing the burden on operators, and enabling sodium-cooled fast reactors to better follow load changes, achieving ideal dynamic response characteristics.

[0129] In summary, the sodium-cooled fast reactor cascade control system and method of the present invention have the following advantages:

[0130] The reactor-following operation mode improves the flexibility of system operation and adapts to the participation of sodium-cooled fast reactors in peak shaving after grid connection in the future;

[0131] In the primary loop power control, the core outlet temperature is introduced for cascade control to ensure that the core outlet temperature can be kept near the reference value. While ensuring the safety of materials and thermal stress, the system can achieve the maximum thermal efficiency and reduce the cost of power generation.

[0132] The secondary loop flow control incorporates the IHX secondary side outlet temperature for cascade control. Therefore, in addition to effectively transferring energy, the intermediate heat exchanger also ensures the stability of the intermediate loop temperature, further guaranteeing the unit's safety.

[0133] 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.

[0134] 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.

[0135] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed in this invention 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 implementations should not be considered beyond the scope of this invention.

[0136] In the embodiments provided by this invention, it should be understood that the disclosed devices / terminals and methods can be implemented in other ways. For example, the device / terminal 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 devices or units may be electrical, mechanical, or other forms.

[0137] 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.

[0138] Furthermore, the functional units in the various embodiments of the present invention 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.

[0139] If the integrated module / 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 can also 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: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0140] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus, and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0141] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0142] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0143] The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made to the technical solution based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. A sodium-cooled fast reactor cascade control system, characterized in that, It includes a core section (I), which is connected to a steam generator section (III) via an intermediate heat exchanger section (II); The core section (I) includes a sodium-cooled fast reactor core (1), and the input terminals of the sodium-cooled fast reactor core (1) are respectively connected to the core inlet temperature (13), the control rod speed (14) and the core inlet flow rate (15). The output of the sodium-cooled fast reactor core (1) is divided into three paths: one path is connected to the power controller (9) for feedback of reactor power (16); the second path is connected to the intermediate heat exchanger section II for feedback of core outlet flow (18); and the third path is divided into two paths: one path is connected to the intermediate heat exchanger section II, and the other path is connected to the power controller (9) via the core outlet temperature controller (8) for feedback of core outlet temperature (17). The input of the sodium-cooled fast reactor core (1) is divided into three paths: one path is connected to the intermediate heat exchanger section II for obtaining core inlet temperature (13); the second path is connected to the power controller (9) for obtaining control rod speed (14); and the third path is connected to the primary loop flow controller (10) via the primary sodium pump (4) for obtaining core inlet flow (15). The intermediate heat exchanger section (II) includes an intermediate heat exchanger (2). The output of the intermediate heat exchanger (2) is divided into three paths. One path outputs the core inlet temperature (13), and the other two paths output the IHX secondary side outlet temperature signal (19) and the IHX secondary side outlet flow signal (20) to the steam generator section (III), respectively. The input of the intermediate heat exchanger (2) is divided into four paths. The first and second paths are connected to the output of the sodium-cooled fast reactor core (1) to obtain the core outlet temperature (17) and the core outlet flow (18). The third path is connected to the secondary sodium pump (5) to obtain the IHX secondary side inlet flow (26). The fourth path is connected to the steam generator (3) of the steam generator section III to obtain the IHX secondary side inlet temperature (25). The output of the steam generator (3) is divided into two paths. One path is connected to the input of the intermediate heat exchanger (2) to provide feedback on the IHX secondary side inlet temperature (25). The other path is connected to the input of the intermediate heat exchanger (2) via the secondary loop temperature controller (11), the secondary loop flow controller (12), and the secondary sodium pump (5). The output of the secondary sodium pump (5) is connected to the input of the secondary loop flow controller (12). The input of the steam generator (3) is connected to the feedwater inlet boundary (6) to obtain the feedwater flow signal (21) and the feedwater temperature signal (22). The output of the steam generator (3) is connected to the steam outlet boundary (7) to provide feedback on the steam temperature signal (23) and the steam flow signal (24).

2. The sodium-cooled fast reactor cascade control system according to claim 1, characterized in that, The core outlet temperature controller (8), the secondary loop temperature controller (11), and the secondary loop flow controller (12) are proportional-integral controllers.

3. The sodium-cooled fast reactor cascade control system according to claim 1, characterized in that, The power controller (9) is a proportional-derivative controller.

4. A method for controlling a sodium-cooled fast reactor cascade, characterized in that, The sodium-cooled fast reactor cascade control system according to claim 1, 2, or 3 includes the following steps: When the turbine load changes, the core outlet temperature signal is acquired, and the deviation between the core outlet temperature signal and the core reference outlet temperature signal is sent to the core outlet temperature controller (8). The reference power signal is added to the output of the core outlet temperature controller (8) to obtain the reference input signal of the power controller (9), forming a cascade control, which is formed by the series connection of the core outlet temperature controller (8) and the power controller (9). After obtaining the deviation between the power signal and the reference input signal of the power controller (9), the signal is sent to the power controller (9) and the control rod speed signal is input to the sodium-cooled fast reactor core (1). The deviation between the core inlet flow signal and the core reference inlet flow signal is obtained and sent to the primary loop flow controller to obtain the pump speed signal of the primary sodium pump (4). The primary sodium pump (4) inputs the obtained core inlet flow signal (15) into the sodium-cooled fast reactor core (1) through the pump speed signal. The IHX secondary side inlet temperature signal is obtained, and the deviation between it and the IHX secondary side reference inlet temperature signal is sent to the second loop temperature controller (11). The IHX secondary side reference inlet flow signal is added to the output of the second loop temperature controller (11) to obtain the reference input signal of the second loop flow controller (12), forming a cascade control, which is formed by the series connection of the second loop temperature controller (11) and the second loop flow controller (12). After obtaining the deviation between the IHX secondary side inlet flow signal and the reference input signal of the secondary loop flow controller (12), the signal is sent to the secondary loop flow controller (12) and the pump speed signal of the secondary sodium pump (5) is obtained. The secondary sodium pump (5) obtains the IHX secondary side inlet flow signal through the pump speed signal and inputs it into the steam generator (3). The feedwater flow signal and feedwater temperature signal are sent into the steam generator (3) from the feedwater inlet boundary (6), and the sodium-cooled fast reactor core (1), primary sodium pump (4), secondary sodium pump (5) and steam generator (3) are regulated.

5. The sodium-cooled fast reactor cascade control method according to claim 4, characterized in that, When the turbine load changes, the feedwater flow rate signal (21) and feedwater temperature signal (22) change, and then the reference power signal (30), core reference outlet temperature signal (29), core reference inlet flow rate signal (31), IHX secondary side reference inlet flow rate signal (28) and IHX secondary side reference inlet temperature signal (27) change accordingly based on the steam flow rate.

6. The sodium-cooled fast reactor cascade control method according to claim 4, characterized in that, The speed signal output by the two-loop flow controller (12) adopts a cascade control method to control the inlet flow of the secondary side of IHX and adjust the inlet temperature of the secondary side of IHX.

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