A reactor control rod hydraulic drive system

Abstract

A reactor control rod hydraulic drive system belongs to the field of nuclear reactor engineering technology. The present invention solves the problems of high heat dissipation requirements, excessively long control lines, and complex drive systems in the prior art during control rod lifting by a magnetic lifting mechanism. The coolant working medium circulation loop includes a circulation pump, a regulating valve, a first main pipeline, and a second main pipeline. The outflow end pipeline of the circulation pump is connected to the inflow end of the regulating valve, the outflow end pipeline of the regulating valve is connected to the inflow end of the first main pipeline, the outflow end pipeline of the first main pipeline is connected to the inflow end of multiple drive cylinder assemblies, the outflow end pipelines of the multiple drive cylinder assemblies are connected to the inflow end of the second main pipeline, and the outflow end pipeline of the second main pipeline is connected to the inflow end of the circulation pump. The present application reduces the system's heat dissipation requirements. The coolant working medium circulation loop is separately provided, which not only shortens the system's lifting transmission line, but also facilitates driving multiple groups of drive cylinder assemblies to complete corresponding motion states.

Description

Technical Field

[0001] The invention relates to a hydraulic driving system for a reactor control rod, belonging to the technical field of nuclear reactor engineering. Background Art

[0002] Nuclear reactor control rods and their drive devices are important equipment in the reactor. They are responsible for the important tasks of reactor startup, power regulation, shutdown and emergency shutdown in accident conditions. Whether they can work normally is directly related to reactor safety. Depending on whether the drive cylinder assembly is inside or outside the pressure vessel, they can be divided into built-in or external types; based on the drive method, they can be divided into mechanical drive, magnetic lift, motor drive and hydraulic drive.

[0003] Commercial pressurized water reactors utilize a magnetic lift mechanism, which uses electromagnetic force to lift control rods and operates in conjunction with pins. This mechanism offers advantages such as fast operation, simple structure, and high lifting force. However, the magnetic lift mechanism requires high heat dissipation requirements, requiring constant heat dissipation, which increases the system's cooling costs. Due to the inherent characteristics of the magnetic lift mechanism, the required lifting drive lines cannot be individually configured, resulting in excessive lengths for each magnetic lift mechanism, significantly increasing reactor height and the risk of rod jams. Furthermore, each magnetic lift mechanism requires a separate drive system, which increases system instability and consumes excessive space. Summary of the Invention

[0004] In view of this, the present invention aims to propose a hydraulic drive system for reactor control rods to solve the problems in the prior art of high heat dissipation requirements of the magnetic lifting mechanism, excessively long control lines, and the need for an independent drive circuit for each set of magnetic lifting mechanisms during the lifting of control rods.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] A reactor control rod hydraulic drive system includes a pressure vessel, a cooling medium circulation loop, control rods, a core, and a drive cylinder assembly. The drive cylinder assembly is one or more. When the drive cylinder assembly is multiple, the cooling medium circulation loop includes a circulation pump, a regulating valve, a first main pipeline, and a second main pipeline. The outflow end of the circulation pump is connected to the inflow end of the regulating valve through a pipeline. The outflow end of the regulating valve is connected to the inflow end of the first main pipeline through a pipeline. The outflow end of the first main pipeline is connected to the inflow end of multiple drive cylinder assemblies through a pipeline. The outflow ends of the multiple drive cylinder assemblies are connected to the inflow end of the second main pipeline through pipelines. The outflow end of the second main pipeline is connected to the inflow end of the second main pipeline. The end is connected to the inflow end of the circulation pump through a pipeline to complete the connection of the cooling medium circulation loop. When there is only one driving cylinder assembly, the outflow end of the regulating valve is connected to the inflow end of the driving cylinder assembly through a pipeline, the outflow end of the driving cylinder assembly is connected to the inflow end of the circulation pump through a pipeline, and the outflow end of the circulation pump is connected to the inflow end of the regulating valve through a pipeline to complete the connection of the cooling medium circulation loop. The pressure vessel and the driving cylinder assembly are both filled with cooling medium. A stop valve is connected to the connecting pipeline between the pressure vessel and the inflow end of the circulation pump. The control rod is fixedly connected to the bottom end of the driving cylinder assembly, and the control rod is slidably connected to the core. The core is arranged in the pressure vessel.

[0007] Furthermore, the cooling medium flows through the drive cylinder assembly from bottom to top.

[0008] Furthermore, a filter is provided between the circulation pump and the regulating valve.

[0009] Furthermore, a solenoid valve is provided at the lower end of each driving cylinder assembly.

[0010] Furthermore, the driving cylinder assembly, the first main pipeline and the second main pipeline are all arranged in a pressure vessel.

[0011] Compared with the prior art, the present invention has the following effects:

[0012] The reactor control rod hydraulic drive system of the present application dissipates heat from the drive cylinder assembly by circulating a cooling medium in a cooling medium circulation loop, thereby reducing the system's heat dissipation requirements and the system's heat dissipation costs.

[0013] The cooling medium circulation loop of the reactor control rod hydraulic drive system of the present application is independently provided, which can realize independent control of the cooling medium circulation loop, and at the same time greatly shorten the system's lifting transmission line, further improving the stability of the system;

[0014] The cooling medium circulation loop of the present application can drive multiple groups of drive cylinder components to complete corresponding motion states, simplifying the control process and reducing control costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 Schematic diagram of the first structure of the reactor control rod hydraulic drive system (when there is only one drive cylinder assembly);

[0017] Figure 2 Schematic diagram of the second structure of the reactor control rod hydraulic drive system (when there are multiple drive cylinder assemblies);

[0018] In the figure: 1. Circulation pump; 2. Filter; 3. Control valve; 4. Stop valve; 5. Solenoid valve; 6. First main pipeline; 7. Second main pipeline; 8. Control rod; 9. Core; 10. Pressure vessel; 11. Drive cylinder assembly. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0020] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0021] Referring to the accompanying drawings, this embodiment is described. A reactor control rod hydraulic drive system includes a pressure vessel 10, a cooling medium circulation loop, control rods 8, a core 9, and a drive cylinder assembly 11. There are one or more drive cylinder assemblies 11. When there are multiple drive cylinder assemblies 11, the cooling medium circulation loop includes a circulation pump 1, a regulating valve 3, a first main pipeline 6, and a second main pipeline 7. The outflow end of the circulation pump 1 is connected to the inflow end of the regulating valve 3 through a pipeline. The outflow end of the regulating valve 3 is connected to the inflow end of the first main pipeline 6 through a pipeline. The outflow end of the first main pipeline 6 is connected to the inflow end of multiple drive cylinder assemblies 11 through a pipeline. The outflow end of the multiple drive cylinder assemblies 11 is connected to the inflow end of the second main pipeline 7 through a pipeline. The outflow end of pipe 7 is connected to the inflow end of circulating pump 1 via a pipeline, completing the connection of the cooling medium circulation loop. When there is only one drive cylinder assembly 11, the outflow end of regulating valve 3 is connected to the inflow end of drive cylinder assembly 11 via a pipeline. The outflow end of drive cylinder assembly 11 is connected to the inflow end of circulating pump 1 via a pipeline. The outflow end of circulating pump 1 is connected to the inflow end of regulating valve 3 via a pipeline, completing the connection of the cooling medium circulation loop. The pressure vessel 10 and drive cylinder assembly 11 are both filled with cooling medium. The connecting pipeline between the pressure vessel 10 and the inflow end of circulating pump 1 is connected to the stop valve 4. The control rod 8 is fixedly connected to the bottom end of the drive cylinder assembly 11 and slidably connected to the core 9, which is disposed within the pressure vessel. The technical solutions of the drive cylinder assembly 11, control rod 8, and core 9 are prior art and will not be further described here. The coolant flows from the pressure vessel 10 into the coolant circulation loop through the shutoff valve 4. When the coolant in the coolant circulation loop is depleted, it can be replenished through the shutoff valve 4, thereby ensuring that the coolant circulation loop is always full of coolant. The simple structure of the coolant circulation loop reduces the difficulty of connecting to multiple drive cylinder assemblies 11, simplifies the control process, and reduces control costs.

[0022] The reactor control rod hydraulic drive system of the present application dissipates heat from the drive cylinder assembly by circulating a cooling medium in a cooling medium circulation loop, thereby reducing the system's heat dissipation requirements and lowering the system's heat dissipation costs. The cooling medium circulation loop of the reactor control rod hydraulic drive system of the present application is independently provided, enabling independent control of the cooling medium circulation loop, while significantly shortening the system's lifting transmission line and further improving the stability of the system. Each cooling medium circulation loop of the present application can drive multiple drive cylinder assemblies to complete corresponding motion states, thereby simplifying the control process and reducing control costs.

[0023] The cooling medium flows upward through the drive cylinder assembly 11 from bottom to top. Due to the flow characteristics of the liquid, this flow can prevent the formation of bubbles in the drive cylinder assembly 11 and the formation of heat dissipation blind spots due to the influence of the cooling medium's own gravity. Therefore, this flow can significantly improve the heat dissipation of the drive cylinder assembly 11.

[0024] A filter 2 is provided between the circulating pump 1 and the regulating valve 3. The filter 2 is mainly used to filter and separate the coolant and impurities in the coolant circulation loop, so as to prevent the coolant from accumulating too many impurities in the coolant circulation loop, thereby affecting circulation and heat dissipation.

[0025] A solenoid valve 5 is provided at the lower end of each drive cylinder assembly 11. Specifically, the solenoid valve 5 is in an open state when power is off. When power is off or the cooling medium circulation loop system loses pressure, the solenoid valve 5 opens, allowing the coolant in the cooling medium circulation loop to flow into the pressure vessel 10, thereby relieving the coolant circulation loop pressure and improving the stability of the system.

[0026] The drive cylinder assembly 11, first main conduit 6, and second main conduit 7 are disposed within a pressure vessel 10. The drive cylinder assembly 11 requires a cooling medium to dissipate heat, while the control rods 8 and the core 9 also require cooling. Since the pressure vessel 10 is filled with cooling medium, placing the drive cylinder assembly 11, control rods 8, and core 9 within the pressure vessel 10 creates an optimal operating environment.

[0027] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A reactor control rod hydraulic drive system, characterized by: The invention comprises a pressure vessel (10), a cooling medium circulation loop, a control rod (8), a core (9) and a driving cylinder assembly (11), wherein the driving cylinder assembly (11) is one or more. When the driving cylinder assembly (11) is multiple, the cooling medium circulation loop comprises a circulation pump (1), a regulating valve (3), a first main pipeline (6) and a second main pipeline (7). The outflow end of the circulation pump (1) is connected to the inflow end of the regulating valve (3) through a pipeline, the outflow end of the regulating valve (3) is connected to the inflow end of the first main pipeline (6) through a pipeline, the outflow end of the first main pipeline (6) is connected to the inflow ends of the multiple driving cylinder assemblies (11) through pipelines, the outflow ends of the multiple driving cylinder assemblies (11) are connected to the inflow end of the second main pipeline (7) through pipelines, and the outflow end of the second main pipeline (7) is connected to the inflow end of the circulation pump (1) through a pipeline. The invention relates to a cooling medium circulation loop. When there is only one driving cylinder assembly (11), the outflow end of the regulating valve (3) is connected to the inflow end of the driving cylinder assembly (11) through a pipeline, the outflow end of the driving cylinder assembly (11) is connected to the inflow end of the circulation pump (1) through a pipeline, and the outflow end of the circulation pump (1) is connected to the inflow end of the regulating valve (3) through a pipeline, thus completing the connection of the cooling medium circulation loop. The interiors of the pressure vessel (10) and the driving cylinder assembly (11) are both filled with cooling medium. The stop valve (4) is connected to the connecting pipeline between the pressure vessel (10) and the inflow end of the circulation pump (1). The control rod (8) is fixedly connected to the bottom end of the driving cylinder assembly (11), and the control rod (8) is slidably connected to the inside of the core (9). The core (9) is arranged in the pressure vessel. The lower end of each driving cylinder assembly (11) is provided with a solenoid valve (5).

2. A reactor control rod hydraulic drive system according to claim 1, characterized in that: The cooling medium flows through the drive cylinder assembly (11) from bottom to top.

3. The reactor control rod hydraulic drive system according to claim 1, characterized in that: A filter (2) is provided between the circulation pump (1) and the regulating valve (3).

4. The reactor control rod hydraulic drive system according to claim 1, characterized in that: The driving cylinder assembly (11), the first main pipeline (6) and the second main pipeline (7) are all arranged in a pressure container (10).

Images