A nuclear power unit primary loop boron concentration control system and method

Abstract

The present application relates to a kind of nuclear power unit one loop boron concentration control system and method.The lower outlet of the nuclear power unit one loop in the system is connected with the first end of electric regulating valve and the first end of hydrogenation station respectively through pipeline, the second end of electric regulating valve is connected with the input end of volume control box through pipeline, the output end of volume control box is connected with the first end of filling pump through pipeline, the second end of hydrogenation station is connected with the first end of filling pump through pipeline.The second end of filling pump is connected with the recovery port of one loop.Electric regulating valve is connected with control terminal, and control terminal is used to adjust the opening of electric regulating valve.The present application can realize the rapid stable convergence of one loop boron concentration by the flexible adjustment of the proportion of RCV system lower flow through volume control box according to various working conditions.

Description

Technical Field

[0001] This invention relates to the field of boron concentration control in nuclear power units, and more specifically, to a boron concentration control system and method for the primary loop of a nuclear power unit. Background Technology

[0002] In nuclear power plant units, the boron concentration in the primary loop is crucial for the safe operation of the unit. Current technology sets a fixed percentage of the RCV system's downstream flow through the control box, for example, 3%. Because this fixed value cannot be changed and must adapt to various operating conditions, it is very small, leading to slow convergence of the primary loop boron concentration. Especially after the unit reaches criticality, the primary loop boron concentration cannot stabilize quickly, requiring a wait for stabilization before further work can proceed. This severely delays the critical path for major overhauls, necessitating a new method to address this issue. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a boron concentration control system and method for the primary loop of a nuclear power unit.

[0004] The technical solution adopted by the present invention to solve its technical problem is: to construct a boron concentration control system for the primary loop of a nuclear power unit, including a primary loop and a voltage regulator, wherein the primary loop is connected to the voltage regulator through a pipeline, and the boron concentration control system further includes a capacity control box, a hydrogen refueling station, a charging pump, an electric regulating valve and a control terminal;

[0005] The drain outlet of the primary circuit is connected to the first end of the electric regulating valve and the first end of the hydrogen refueling station via pipes. The second end of the electric regulating valve is connected to the input end of the capacity control box via a pipe. The output end of the capacity control box is connected to the first end of the charging pump via a pipe. The second end of the hydrogen refueling station is connected to the first end of the charging pump via a pipe. The second end of the charging pump is connected to the recovery port of the primary circuit.

[0006] The electric regulating valve is connected to the control terminal, and the control terminal is used to adjust the opening degree of the electric regulating valve.

[0007] Furthermore, in the primary loop boron concentration control system of the nuclear power unit described in this invention, the control terminal includes an instruction receiving module for receiving control instructions, which are used to adjust the opening degree of the electric regulating valve.

[0008] Furthermore, in the boron concentration control system of the primary loop of the nuclear power unit described in this invention, the control terminal includes a memory for storing at least two preset control modes. Each preset control mode includes a correspondence between preset operating conditions and valve opening instructions. The valve opening instructions are used to adjust the electric regulating valve to a preset opening.

[0009] The control terminal further includes a mode receiving module for receiving mode selection instructions, the mode receiving module being used to select the preset control mode.

[0010] Furthermore, in the boron concentration control system for the primary loop of a nuclear power unit described in this invention, each preset control mode corresponds to mode usage instructions.

[0011] The control terminal also includes a display module for displaying each of the preset control modes and usage instructions for each of the preset control modes.

[0012] Furthermore, in the primary loop boron concentration control system for nuclear power units described in this invention, the control terminal further includes a monitoring module for acquiring the operating status parameters of the nuclear power unit, and the control terminal adjusts the opening degree of the electric regulating valve according to the operating status parameters.

[0013] In addition, the present invention also provides a method for controlling boron concentration in the primary loop of a nuclear power unit, applied to the boron concentration control system for the primary loop of a nuclear power unit as described above, the method comprising:

[0014] The control terminal sends control commands to the electric regulating valve;

[0015] The electric regulating valve executes the control command to adjust the opening degree of the electric regulating valve.

[0016] Furthermore, in the boron concentration control method for the primary loop of a nuclear power unit described in this invention, the method further includes the following step before the control terminal sends control commands to the electric regulating valve:

[0017] The instruction receiving module of the control terminal receives the control instructions.

[0018] Furthermore, in the boron concentration control method for the primary loop of a nuclear power unit described in this invention, the method further includes the following step before the control terminal sends control commands to the electric regulating valve:

[0019] The mode receiving module of the control terminal receives the mode selection instruction;

[0020] Find the preset control mode corresponding to the mode selection command;

[0021] Obtain the valve opening command included in the preset control mode, and use the valve opening command as the control command.

[0022] Furthermore, in the boron concentration control method for the primary loop of a nuclear power unit according to the present invention, the method further includes: the display module of the control terminal displays each of the preset control modes and the mode usage instructions for each of the preset control modes;

[0023] The preset control modes include:

[0024] In the first control mode, the valve opening corresponding to the first control mode causes the flow through the control box to account for 3% of the total outflow.

[0025] The second control mode is such that the valve opening corresponding to the second control mode makes the flow through the control box account for 10% of the total discharge flow.

[0026] The third control mode is such that the valve opening corresponding to the third control mode makes the flow through the control box account for 20% of the total discharge flow.

[0027] Furthermore, in the boron concentration control method for the primary loop of a nuclear power unit described in this invention, the method further includes the following step before the control terminal sends control commands to the electric regulating valve:

[0028] The monitoring module of the control terminal acquires the operating status parameters of the nuclear power unit;

[0029] The control terminal generates the control command based on the operating status parameters.

[0030] The boron concentration control system and method for the primary loop of a nuclear power unit, which implements the present invention, has the following beneficial effects: The present invention can achieve rapid and stable convergence of the boron concentration in the primary loop by flexibly adjusting the proportion of the RCV system flowing through the capacitive control box according to various operating conditions through an electric regulating valve. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0032] Figure 1 This is a schematic diagram of the structure of the boron concentration control system for the primary loop of a nuclear power unit provided in an embodiment of the present invention;

[0033] Figure 2 This is a schematic diagram of the structure of the boron concentration control system for the primary loop of a nuclear power unit provided in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the boron concentration control system for the primary loop of a nuclear power unit provided in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the structure of the boron concentration control system for the primary loop of a nuclear power unit provided in an embodiment of the present invention;

[0036] Figure 5 This is a flowchart of the boron concentration control method for the primary loop of a nuclear power unit provided in an embodiment of the present invention;

[0037] Figure 6 This is a flowchart of the boron concentration control method for the primary loop of a nuclear power unit provided in an embodiment of the present invention;

[0038] Figure 7 This is a flowchart of the boron concentration control method for the primary loop of a nuclear power unit provided in an embodiment of the present invention;

[0039] Figure 8 This is a flowchart of a method for controlling boron concentration in the primary loop of a nuclear power unit, provided in an embodiment of the present invention. Detailed Implementation

[0040] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] In a preferred embodiment, reference Figure 1 The boron concentration control system for the primary loop of the nuclear power unit described in this embodiment includes a primary loop 10 and a voltage regulator 20. The primary loop 10 is connected to the voltage regulator 20 via pipelines. The primary loop boron concentration control system also includes a capacity control box 30, a hydrogen refueling station 40, a charging pump 50, an electric regulating valve 60, and a control terminal 70. The drain port of the primary loop 10 is connected via pipelines to the first end of the electric regulating valve 60 and the first end of the hydrogen refueling station 40. The second end of the electric regulating valve 60 is connected via a pipeline to the input end of the capacity control box 30. The output end of the capacity control box 30 is connected via a pipeline to the first end of the charging pump 50. The second end of the hydrogen refueling station 40 is connected via a pipeline to the first end of the charging pump 50. The second end of the charging pump 50 is connected to the recovery port of the primary loop 10. Alternatively, the capacity control box 30 is filled with nitrogen.

[0042] The electrically operated regulating valve 60 is connected to a control terminal 70 via the nuclear power plant's communication network. The control terminal 70 is used to adjust the opening degree of the electrically operated regulating valve 60. It is understood that the control terminal 70 remotely controls the electrically operated regulating valve 60, so it can be positioned far away from the valve to prevent personnel from entering the radiation area to adjust the valve, thus reducing their radiation dose. When it is necessary to adjust the opening degree of the electrically operated regulating valve 60, the control terminal 70 sends a control command to the valve, and the valve executes the command to adjust its opening degree.

[0043] In this embodiment, the proportion of the RCV system flowing through the capacitive control box can be flexibly adjusted by an electric regulating valve according to various operating conditions, thereby achieving rapid and stable convergence of the boron concentration in the primary loop.

[0044] In some embodiments of the primary loop boron concentration control system for nuclear power units, reference Figure 2In this embodiment, the control terminal 70 includes an instruction receiving module 701 for receiving control commands, which are used to adjust the opening degree of the electric regulating valve 60. The instruction receiving module 701 of the control terminal 70 receives the control commands and sends them to the electric regulating valve 60. The electric regulating valve 60 executes the control commands to adjust its opening degree. Alternatively, the instruction receiving module 701 can be a physical button, physical knob, physical knob, or a virtual button displayed on a screen. This embodiment achieves remote control of the opening degree of the electric regulating valve 60 by receiving control commands through the instruction receiving module 701, avoiding on-site control by personnel and reducing radiation exposure to workers.

[0045] In some embodiments of the primary loop boron concentration control system for nuclear power units, reference Figure 3 The control terminal 70 in this embodiment includes a memory 702 for storing at least two preset control modes. Each preset control mode includes a correspondence between preset operating conditions and valve opening commands. The valve opening commands are used to adjust the electric regulating valve 60 to a preset opening.

[0046] As an option, the preset control modes include a first control mode, a second control mode, and a third control mode. The valve opening corresponding to the first control mode is such that the flow through the control tank 30 accounts for 3% of the total discharged flow; the valve opening corresponding to the second control mode is such that the flow through the control tank 30 accounts for 10% of the total discharged flow; and the valve opening corresponding to the third control mode is such that the flow through the control tank 30 accounts for 20% of the total discharged flow. The first control mode is used under normal load tracking power variation conditions; the second control mode is used when the nuclear power unit's power is maintained at a stable level; and the third control mode is used when the nuclear power unit reaches critical, transient, or accident conditions and the first loop experiences high-flow dilution and boronizing. It is understood that the three control modes listed here are not the only limitations on the preset control modes; more preset control modes can be set as needed to adjust different openings of the electric regulating valve.

[0047] Furthermore, the control terminal 70 in this embodiment also includes a mode receiving module 703 for receiving mode selection instructions. The mode receiving module 703 is connected to the memory 702 and is used to select a preset control mode. After receiving the mode selection instruction, the mode receiving module 703 searches for the preset control mode corresponding to the mode selection instruction in the memory 702. Since the preset control mode includes the correspondence between preset operating conditions and valve opening instructions, the valve opening instruction corresponding to the mode selection instruction can be obtained, and the valve opening instruction is used as a control instruction. The control terminal 70 sends the control instruction to the electric regulating valve 60, and the electric regulating valve 60 executes the control instruction to adjust the opening of the electric regulating valve 60.

[0048] This embodiment features multiple adjustment modes, each corresponding to one opening degree of the electric regulating valve 60. This allows operators to directly select the appropriate operating mode based on working conditions or flow control needs, improving adjustment efficiency. Simultaneously, preset operating modes limit the adjustable range, preventing dangerous arbitrary adjustments.

[0049] In some embodiments of the primary loop boron concentration control system for nuclear power units, reference Figure 3 In this embodiment, each preset control mode corresponds to a mode usage instruction. Furthermore, the control terminal 70 also includes a display module 704 for displaying each preset control mode and its usage instruction. It is understood that displaying each preset control mode and its usage instruction on the control terminal allows operators to view the information, enabling them to confirm the selected preset control mode during adjustment, avoiding operational errors due to operator memory lapses, and improving safety.

[0050] In some embodiments of the primary loop boron concentration control system for nuclear power units, reference Figure 4 In this embodiment, the control terminal 70 further includes a monitoring module 705 for acquiring the operating status parameters of the nuclear power unit. These operating status parameters refer to parameters that are directly or indirectly related to the boron concentration in the primary loop of the nuclear power unit; that is, these operating status parameters can be used to determine whether the boron concentration in the primary loop needs adjustment. The control terminal 70 uses a preset algorithm to determine whether the current operating status parameters require boron concentration adjustment and by how much. If adjustment is needed, the control terminal 70 generates a control command based on the operating status parameters. The opening degree of the electric regulating valve 60 corresponding to this control command meets the requirements of the operating status parameters. The control terminal 70 sends the control command to the electric regulating valve 60, which executes the control command to adjust its opening degree, achieving rapid and stable convergence of the boron concentration in the primary loop. This embodiment achieves automatic control of the electric regulating valve 60 by monitoring the operating status parameters of the nuclear power unit, saving manpower and enabling more timely adjustments.

[0051] In a preferred embodiment, the boron concentration control method for the primary loop of a nuclear power unit in this embodiment is applied to the boron concentration control system for the primary loop of a nuclear power unit as described in the above embodiment. Specifically, refer to... Figure 5 The boron concentration control method for the primary loop of this nuclear power unit includes:

[0052] Step S1: The control terminal 70 sends a control command to the electric regulating valve 60.

[0053] Step S2: The electric regulating valve 60 executes a control command to adjust the opening degree of the electric regulating valve 60.

[0054] In this embodiment, the proportion of the RCV system flowing through the capacitive control box 30 can be flexibly adjusted by an electric regulating valve according to various operating conditions, thereby achieving rapid and stable convergence of the boron concentration in the primary loop.

[0055] In some embodiments of the boron concentration control method for the primary loop of a nuclear power unit, reference is made to... Figure 6 Before the control terminal 70 sends the control command to the electric regulating valve 60, the following is also included:

[0056] Step S11: The instruction receiving module 701 of the control terminal 70 receives the control instruction. The instruction receiving module 701 of the control terminal 70 receives the control instruction and sends the control instruction to the electric regulating valve 60. The electric regulating valve 60 executes the control instruction to adjust the opening degree of the electric regulating valve 60.

[0057] Step S1: The control terminal 70 sends a control command to the electric regulating valve 60.

[0058] Step S2: The electric regulating valve 60 executes a control command to adjust the opening degree of the electric regulating valve 60.

[0059] In this embodiment, the control command is received by the command receiving module 701 to realize remote control of the electric regulating valve opening of 60 degrees, avoiding on-site control by staff and reducing radiation exposure to staff.

[0060] In some embodiments of the boron concentration control method for the primary loop of a nuclear power unit, reference is made to... Figure 7 Before the control terminal 70 sends the control command to the electric regulating valve 60, the following is also included:

[0061] Step S121: The mode receiving module 703 of the control terminal 70 receives the mode selection instruction.

[0062] Step S122: Find the preset control mode corresponding to the mode selection command. The preset control modes include:

[0063] In the first control mode, the valve opening corresponding to the first control mode causes the flow through the control box 30 to account for 3% of the total discharge flow.

[0064] The second control mode corresponds to a valve opening that causes the flow through the control box to account for 10% of the total outflow.

[0065] In the third control mode, the valve opening is such that the flow through the control box accounts for 20% of the total outflow.

[0066] Step S123: Obtain the valve opening command included in the preset control mode and use the valve opening command as the control command. After receiving the mode selection command, the mode receiving module 703 of the control terminal 70 searches for the preset control mode corresponding to the mode selection command in the memory 702. Since the preset control mode includes the correspondence between preset operating conditions and valve opening commands, the valve opening command corresponding to the mode selection command can be obtained, and the valve opening command is used as the control command.

[0067] Step S1: The control terminal 70 sends a control command to the electric regulating valve 60.

[0068] Step S2: The electric regulating valve 60 executes a control command to adjust the opening degree of the electric regulating valve 60.

[0069] This embodiment features multiple operating modes, each corresponding to a specific opening degree of the electric regulating valve 60. This allows operators to directly select the appropriate mode based on flow control needs, improving regulation efficiency. Simultaneously, preset operating modes limit the adjustable range, preventing potential hazards from arbitrary adjustments.

[0070] In some embodiments of the boron concentration control method for the primary loop of a nuclear power unit, the method further includes: a display module 704 of the control terminal 70 displays each preset control mode and its usage instructions. It is understood that displaying each preset control mode and its usage instructions on the control terminal allows operators to review the information, enabling them to confirm the correctness of the selected preset control mode during adjustments, thus preventing operational errors due to operator memory lapses and improving safety.

[0071] In some embodiments of the boron concentration control method for the primary loop of a nuclear power unit, reference is made to... Figure 8 Before the control terminal 70 sends the control command to the electric regulating valve 60, the following is also included:

[0072] Step S131: The monitoring module 705 of the control terminal 70 acquires the operating status parameters of the nuclear power unit. Here, the operating status parameters of the nuclear power unit refer to parameters that are directly or indirectly related to the boron concentration in the primary loop of the nuclear power unit; that is, the operating status parameters can be used to determine whether the boron concentration in the primary loop needs to be adjusted.

[0073] Step S132: The control terminal 70 generates control commands based on the working status parameters.

[0074] Step S1: The control terminal 70 sends a control command to the electric regulating valve 60.

[0075] Step S2: The electric regulating valve 60 executes a control command to adjust its opening. The control terminal 70 uses a preset algorithm to determine whether the current operating parameters require adjustment of the boron concentration and by how much. If adjustment is needed, the control terminal 70 generates a control command based on the operating parameters, and the opening of the electric regulating valve 60 corresponding to this command meets the requirements of the operating parameters. The control terminal 70 sends the control command to the electric regulating valve 60, which executes the command to adjust its opening, achieving rapid and stable convergence of the primary loop boron concentration.

[0076] This embodiment achieves automatic control of the electric regulating valve 60 by monitoring the operating status parameters of the nuclear power unit, saving manpower and enabling adjustments to be completed more promptly.

[0077] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0078] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. 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.

[0079] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (702) (RAM), main memory, read-only memory (702) (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0080] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They do not limit the scope of protection of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A boron concentration control system for the primary loop of a nuclear power unit, comprising a primary loop (10) and a voltage regulator (20), wherein the primary loop (10) is connected to the voltage regulator (20) via a pipeline, characterized in that, The boron concentration control system also includes a capacity control box (30), a hydrogen refueling station (40), a charging pump (50), an electric regulating valve (60), and a control terminal (70). The drain outlet of the primary circuit (10) is connected to the first end of the electric regulating valve (60) and the first end of the hydrogen refueling station (40) via pipes. The second end of the electric regulating valve (60) is connected to the input end of the capacity control box (30) via pipes. The output end of the capacity control box (30) is connected to the first end of the charging pump (50) via pipes. The second end of the hydrogen refueling station (40) is connected to the first end of the charging pump (50) via pipes. The second end of the charging pump (50) is connected to the recovery port of the primary circuit (10). The electric regulating valve (60) is connected to the control terminal (70); The control terminal (70) includes a memory (702) for storing at least two preset control modes. Each preset control mode includes a correspondence between a preset operating condition and a valve opening command. The valve opening command is used to adjust the electric regulating valve (60) to a preset opening. The control terminal (70) further includes a mode receiving module (703) for receiving mode selection instructions, the mode receiving module (703) being used to select the preset control mode; The preset control modes include: In the first control mode, the valve opening corresponding to the first control mode causes the flow rate through the control box (30) to account for 3% of the total discharge flow rate; The second control mode, the valve opening corresponding to the second control mode, makes the flow through the capacity control box (30) account for 10% of the total discharge flow; The third control mode is such that the valve opening corresponding to the third control mode makes the flow through the capacity control box (30) account for 20% of the total discharge flow.

2. The boron concentration control system for the primary loop of a nuclear power unit according to claim 1, characterized in that, The control terminal (70) further includes an instruction receiving module (701) for receiving control instructions, which are used to adjust the opening degree of the electric regulating valve (60).

3. The nuclear power plant primary circuit boron concentration control system in accordance with claim 1 characterized by, Each of the preset control modes has corresponding usage instructions; The control terminal (70) further includes a display module (704) for displaying each of the preset control modes and mode usage instructions for each of the preset control modes.

4. The nuclear power plant primary circuit boron concentration control system in accordance with claim 1 characterized by, The control terminal (70) also includes a monitoring module (705) for acquiring the operating status parameters of the nuclear power unit, and the control terminal (70) adjusts the opening of the electric regulating valve (60) according to the operating status parameters.

5. A method for controlling boron concentration in the primary loop of a nuclear power unit, characterized in that, The method, applied to the primary loop boron concentration control system of a nuclear power unit as described in any one of claims 1 to 4, comprises: The mode receiving module (703) of the control terminal (70) receives the mode selection instruction; Find the preset control mode corresponding to the mode selection command; Obtain the valve opening command included in the preset control mode, and use the valve opening command as a control command; The control terminal (70) sends the control command to the electric regulating valve (60). The electric regulating valve (60) executes the control command to adjust the opening degree of the electric regulating valve (60); Each of the preset control modes includes the correspondence between the preset operating conditions and the valve opening command; The preset control modes include: In the first control mode, the valve opening corresponding to the first control mode causes the flow rate through the control box (30) to account for 3% of the total discharge flow rate; The second control mode, the valve opening corresponding to the second control mode, makes the flow through the capacity control box (30) account for 10% of the total discharge flow; The third control mode is such that the valve opening corresponding to the third control mode makes the flow through the control box (30) account for 20% of the total discharge flow.

6. The nuclear power plant primary circuit boron concentration control method according to claim 5, characterized by, Before the control terminal (70) sends the control command to the electric regulating valve (60), the following is also included: The instruction receiving module (701) of the control terminal (70) receives the control instruction.

7. The nuclear power plant primary circuit boron concentration control method according to claim 5, characterized by, Also includes: The display module (704) of the control terminal (70) displays each of the preset control modes and the mode usage instructions for each of the preset control modes.

8. The method for controlling boron concentration in the primary loop of a nuclear power unit according to claim 5, characterized in that, Before the control terminal (70) sends the control command to the electric regulating valve (60), the following is also included: The monitoring module (705) of the control terminal (70) acquires the operating status parameters of the nuclear power unit; The control terminal (70) generates the control command based on the working status parameters.

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