High-temperature gas cooled reactor control rod drive wire test device and test method

Abstract

The invention discloses a high-temperature gas cooled reactor control rod drive wire test device and a test method, the test device comprises a vertically arranged pressure-bearing container formed by connecting a plurality of pressure-bearing cylinders, the test device also comprises a deformation control device, the pressure-bearing container is a multi-degree-of-freedom pressure-bearing container, the top of the multi-degree-of-freedom pressure-bearing container is connected with a foundation through a mounting flange, and the deformation control device is connected with the deformation control device. A sealing flange cover is installed at the bottom of the multi-degree-of-freedom pressure-bearing container, the multi-degree-of-freedom pressure-bearing container is provided with a deformation unit, the deformation unit comprises a pressure-bearing barrel and an expansion joint installed on the pressure-bearing barrel, and the deformation control device is connected with the pressure-bearing barrel in the deformation unit and controls displacement of the pressure-bearing barrel. According to the invention, the expansion joint is adopted to enable the pressure-bearing container to generate controllable and settable deformation, and after installation, deformation units and deformation control devices arranged at different positions can generate various forms of deformation, so that more accurate control rod operation drive line simulation can be provided; and the control rod falling time and the performance life of the control rod drive wire can be conveniently researched.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature gas-cooled reactor nuclear power plants, and in particular to a high-temperature gas-cooled reactor control rod drive line test device and test method. Background Art

[0002] The modular high-temperature gas-cooled reactor (HTGR) is a fourth-generation nuclear energy technology independently developed in my country. Its inherent safety, high efficiency, and versatility have attracted widespread attention. The control rod drive mechanism is a key component of nuclear power plant safety. Its function is to regulate reactor power during operation and, in the event of an accident, to shut down the reactor through emergency rod drop. The timing of emergency rod drop is crucial to reactor safety, and a key factor influencing this time is the deformation of the control rod operating space.

[0003] The inventors discovered that control rod drive line test equipment in the industry is mostly suitable for pressurized water reactors (PWRs), while research on control rod drive line test equipment for high-temperature gas-cooled reactors (HTGRs) is limited. The structure of HTGRs differs significantly from that of PWRs, and the requirements for control rod drive line test equipment are also different. Generally speaking, PWR control rods operate in a high-temperature, high-pressure environment (temperature ≥320°C, pressure ≥15.4 MPa). They travel within the fuel assembly's guide tubes over a relatively short distance (≥3.6 meters). Therefore, a control rod drive line test equipment only needs to meet the temperature, pressure, and travel distance requirements. However, HTGR control rods operate in a high-temperature, high-pressure environment (temperature ≥650°C, pressure ≥7 MPa), within graphite brick tunnels, over a longer distance (≥11 meters). Therefore, the test equipment must not only consider these temperature, pressure, and travel distance requirements, but also account for abnormal operating conditions such as earthquakes, overheating, and large aircraft impacts, which can cause graphite brick misalignment and deformation, leading to deformation in the control rod travel space and impacting rod drop time. Existing test equipment is usually a fixed structure that can only meet the temperature, pressure and short operating distance requirements, and cannot meet the requirements of high-temperature gas-cooled reactors for large strokes and deformation of the operating space. Summary of the Invention

[0004] The purpose of the present invention is to provide a control rod drive line test device and test method, which can simulate the operating space and test atmosphere of the control rod assembly. Since the deformation of the test device can be controlled, the misalignment deformation of the graphite brick can be simulated, and the influence of the operating space change on the rod drop time can be studied.

[0005] To achieve the above object, the present invention provides the following technical solutions: A high-temperature gas-cooled reactor control rod drive line test device includes a vertically arranged pressure vessel composed of multiple pressure-bearing cylinders connected together, and also includes a deformation control device. The pressure vessel is a multi-degree-of-freedom pressure vessel, the top of the multi-degree-of-freedom pressure vessel is connected to the foundation via a mounting flange, and a sealing flange cover is installed at the bottom. The multi-degree-of-freedom pressure vessel has a deformation unit, which includes a pressure-bearing cylinder and an expansion joint installed on the pressure-bearing cylinder. The deformation control device is connected to the pressure-bearing cylinder in the deformation unit and controls the displacement of the pressure-bearing cylinder. Because the expansion joint has a certain degree of deformation freedom, the expansion joint is installed between the pressure-bearing cylinders, and the deformation control device pushes the pressure-bearing cylinder to displace, so that the entire pressure vessel will deform. Because multiple deformation units can be provided and can be set at different positions, the deformation can vary to a certain extent, thereby more accurately simulating the dislocation deformation of graphite bricks.

[0006] The expansion joint is an angular expansion joint or an axial expansion joint or a combination of an angular expansion joint and an axial expansion joint.

[0007] The test apparatus also includes a support device connected to the foundation and to the pressure-bearing cylinder beneath the axial expansion joint, supporting the pressure-bearing cylinder. The pressure vessel is vertically positioned, the axial expansion joint has axial freedom, and the pressure-bearing cylinder has its own weight. Therefore, supporting the pressure-bearing cylinder beneath the axial expansion joint makes its deformation controllable.

[0008] The supporting device comprises a support ear fixed on the pressure-bearing cylinder and a linear slide slidably connected to the support ear, and the linear slide is fixed on the foundation.

[0009] The deformation control device is connected to the pressure-bearing cylinder with lugs to control its horizontal displacement. Axial expansion joints, due to their structure, have three planar degrees of freedom: two rotational degrees of freedom and one axial extension degree of freedom. Angular expansion joints have one planar degree of freedom: rotational. Through the lugs, linear slides, and deformation control device, the pressure-bearing cylinder of the deformation unit undergoes only horizontal displacement, enabling more accurate control of the deformation of multi-DOF pressure vessels.

[0010] The deformation control device includes a hinge seat, a fixed bracket, an electric push rod and a controller; the fixed bracket is fixed on the foundation, the hinge seat is fixed on the wall of the pressure cylinder, one end of the electric push rod is fixed on the hinge seat, and the other end is connected to the fixed bracket through a hinge joint. The controller is used to control the extension or shortening of the electric push rod.

[0011] The angular expansion joint and the axial expansion joint in the deformation unit are arranged at intervals between the pressure-bearing cylinders.

[0012] Three circles of threaded holes are set on the mounting flange. Screws pass through the outer circle of threaded holes to be fixed to the foundation, screws pass through the middle circle of threaded holes to be connected to the simulated head, and screws pass through the inner circle of threaded holes to be connected to the pressure cylinder.

[0013] Some pressure-bearing cylinders are welded with connecting flanges to the gas supply system, providing the required temperature, pressure, and medium environment for the control rod drive line test device.

[0014] A high-temperature gas-cooled reactor control rod drive line test method uses the above-mentioned high-temperature gas-cooled reactor control rod drive line test device, controls the pressure-bearing cylinder connected to the deformation control device to displace through a deformation control device, and deforms the pressure vessel.

[0015] An expansion joint is an elastic compensation element that can freely expand and contract. Its common application scenario is to use its own elastic deformation to compensate for the axial, lateral and angular displacement of the pipeline caused by factors such as temperature changes, mechanical deformation or installation deviation, or to connect different parts of the pipeline system to make the pipeline flexible, thereby reducing the stress and deformation of the pipeline during operation. The present application uses an expansion joint to make the pressure vessel deform in a controllable and settable manner. Compared with the existing rigidity test device that uses elbows to change the control rod operation drive line, after installation, various forms of deformation can occur through the deformation units and deformation control devices set at different positions, which can provide a more accurate simulation of the control rod operation drive line, facilitating the study of the control rod drop time and the performance life of the control rod drive line. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the control rod drive line pressure test device of the present invention.

[0017] Figure 2 It is a schematic diagram of the connection structure between the support device and the pressure-bearing cylinder of the present invention.

[0018] Figure 3 It is a schematic diagram of the connection structure between the deformation control device and the pressure-bearing cylinder of the present invention.

[0019] Figure 4 Schematic diagram of the deformation unit structure of the present invention.

[0020] Figure 5 Schematic diagram of the C-shaped deformation of the control rod drive line pressure test device in embodiment 2 of the present invention.

[0021] Figure 6 Schematic diagram of the S-shaped deformation of the control rod drive line pressure test device in embodiment 2 of the present invention.

[0022] Figure 7 Schematic diagram of the W-shaped deformation of the control rod drive line pressure test device in embodiment 2 of the present invention.

[0023] Figure: 1. Multi-degree-of-freedom pressure vessel; 101. Mounting flange; 102. Pressure cylinder with lugs; 1021. Hinge seat; 1022 Lugs; 1023 Pins; 1024. Connecting flange; 103. Pressure cylinder without lugs; 104. O-ring; 105. Axial expansion joint; 106. Angular expansion joint; 107. Sealing flange cover; 2. Deformation control device; 201. Electric push rod; 202. Fixed bracket; 203. Controller; 204. Hinge joint; 3. Linear slide; 4. Simulated head; 5. Control rod drive mechanism; 6. Control rod assembly simulator. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0026] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal communication between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. Example 1

[0027] like Figure 1 As shown, a control rod drive line test device includes a multi-degree-of-freedom pressure vessel 1 and a deformation control device 2. The multi-degree-of-freedom pressure vessel 1 is mainly composed of multiple pressure cylinders connected vertically. The structure of the pressure cylinder is the existing technology, and can be a straight cylinder or a variable diameter cylinder. The length of each pressure cylinder can be the same or different, and these lengths can be set according to the specific conditions of the actual graphite channel to be simulated.

[0028] The top of the multi-degree-of-freedom pressure vessel 1 is connected to the foundation and the simulated head 4 through the mounting flange 101 and the O-ring 104, and the sealing flange cover 107 is installed at the bottom. The top of the simulated head 4 is connected to the control rod drive mechanism 5, thereby forming a closed space inside the multi-degree-of-freedom pressure vessel, and the control rod assembly simulator 6 operates in this space.

[0029] There are three circles of threaded holes on the mounting flange 101. Screws pass through the outer circle of threaded holes to fix the mounting flange 101 to the foundation, screws pass through the middle circle of threaded holes to fix the mounting flange 101 to the simulated head 4, and screws pass through the inner circle of threaded holes to fix the mounting flange 101 to the top pressure-bearing cylinder, so that the multi-degree-of-freedom pressure vessel 1 is set vertically.

[0030] The multi-freedom pressure vessel 1 has a deformation unit, which includes a pressure-bearing cylinder and an expansion joint installed between the pressure-bearing cylinders. Figure 4 As shown, the pressure cylinders in the deformation unit are connected by expansion joints, and the expansion joints installed between the pressure cylinders are axial expansion joints 105 or axial expansion joints 105 or a combination of angular expansion joints and axial expansion joints (a combination refers to two expansion joints that are directly connected by welding or flanges without a pressure cylinder in the middle. This form is not shown in the figure, but can be understood by those skilled in the art). To facilitate the explanation of the technical solution of the present application, the number and setting positions of the pressure cylinders and expansion joints of the multi-degree-of-freedom pressure vessel shown in the figure or in the following description are fixed, but the multi-degree-of-freedom pressure vessel shown in the figure is not the only one of the present application and cannot be used to limit the scope of protection of the present application. Those skilled in the art can set multiple deformation units on the multi-degree-of-freedom pressure vessel according to the actual situation of the graphite brick duct to be simulated, and the setting position can also be changed according to the actual situation. All these changes fall within the scope of protection of the present application.

[0031] The expansion joint on the multi-degree-of-freedom pressure vessel 1 is set as follows Figure 1 As shown, from top to bottom, the angular expansion joint 105 and the axial expansion joint 106 are spaced apart between the pressure-bearing cylinder. Since the axial expansion joint 106 has axial freedom, a support device is provided on the pressure-bearing cylinder below the axial expansion joint 106. The support device is a lug 1022 fixed on the pressure-bearing cylinder and a linear slide 3 fixed on the foundation. The pressure-bearing cylinder is divided into a pressure-bearing cylinder with a lug 102 and a pressure-bearing cylinder without a lug 103. Figure 2 As shown, a linear slide 3 is fixedly mounted on the base next to the lug-supported pressure-bearing cylinder 103. Lugs 1022 are connected to and can slide on the linear slide 3. Lugs 1022 and the linear slide 3 support the lug-supported pressure-bearing cylinder. The linear slide 3 can be a conventional structure, i.e., having a slide rail or a slide groove, with the lugs mounted on the rail or groove.

[0032] The pressure-bearing cylinder body with lugs 102 and the pressure-bearing cylinder body without lugs 103 are sealedly connected to the expansion joint through flanges or welding.

[0033] like Figure 2 and Figure 3 As shown, the deformation control device 2 includes a hinge seat 1021, a fixed bracket 202, an electric push rod 201, and a controller 203. The fixed bracket 202 is fixed to the foundation, and the hinge seat 1021 is fixed to the cylinder wall of the pressure cylinder section 102 via a pin 1023. One end of the electric push rod 201 is fixed to the hinge seat 1021, and the other end is connected to the fixed bracket 202 via a hinge joint 204. The controller 203 is used to control the extension or contraction of the electric push rod 201. The electric push rod and the controller that controls the electric push rod are existing technologies, and their internal structure and operating principles are not described in detail here.

[0034] The deformation control device 2 is connected to the pressure-bearing cylinder with support ears 102, and controls the horizontal displacement of the pressure-bearing cylinder with support ears 102 when deformation is required.

[0035] A connecting flange 1024 is welded to the pressure cylinder and connected to the gas supply system to provide high-temperature and high-pressure gas to the multi-degree-of-freedom pressure vessel 1 to maintain the pressure and medium atmosphere during the operation test of the control rod assembly simulator 6.

[0036] like Figure 1 As shown, a simulated end cap 4 and a control rod drive mechanism 5 are mounted on the multi-degree-of-freedom pressure vessel 1 of the control rod drive line test apparatus, with a control rod assembly dummy 6 installed inside. The simulated end cap 4 is connected to the multi-degree-of-freedom pressure vessel 1 via a mounting flange 101 and sealed with an O-ring 104. The structure and connection method of the control rod drive mechanism 5 and the control rod assembly dummy 6 are not part of the test apparatus and will not be detailed here.

[0037] In this embodiment, four deformation control devices 2 are provided. The number of deformation control devices 2 provided is determined according to the required deformation requirements. Example 2

[0038] The present invention adopts Figure 1 The test device controls the horizontal displacement of the pressure-bearing cylinder connected to the deformation control device through the deformation control device, causing the pressure vessel to deform and perform the control rod drive line test. The specific steps include: (1) The simulated head 4 is installed on the multi-degree-of-freedom pressure vessel 1; (2) After the control rod actuator 5 and the control rod assembly dummy 6 are connected, they are placed together in the multi-degree-of-freedom pressure vessel 1; (3) The control rod drive mechanism 5 is connected to the simulated head 4; (4) The gas supply system is connected to the pressure vessel through the connecting flange 1024 on the pressure vessel. The gas supply system can evacuate the multi-degree-of-freedom pressure vessel 1 and then introduce high-pressure (7 MPa) and high-temperature (560°C) helium to provide a high-temperature and high-pressure operating environment for the control rod drive line; (5) The electric push rod of the deformation control device 2 is started to control the horizontal displacement of the pressure cylinder in the multi-degree-of-freedom pressure container 1, causing the multi-degree-of-freedom pressure container 1 to deform.

[0039] The specific deformations are as follows: When all the electric push rods in the deformation control device 2 are in the middle position, the multi-degree-of-freedom pressure container 1 is a straight line without misalignment; When the third (from the top) deformation control device is extended by the controller, the electric push rod drives the pressure cylinder segment to move, generating a distance L (about 50mm). The other deformation control devices remain stationary. At this time, the control rod drive line test device simulates the C-type misalignment of the reactor core, such as Figure 5 As shown; When the first (starting from the top) deformation control device uses the controller to drive the electric push rod to extend, the electric push rod drives the pressure barrel segment to move, generating a distance L (about 50mm); the second and third (starting from the top) deformation control devices use the controller to drive the electric push rod to retract, the electric push rod drives the pressure barrel segment to move, generating a distance -L (about -50mm), the fourth deformation control device uses the controller to drive the electric push rod to extend, the electric push rod drives the pressure barrel segment to move, generating an eccentricity of a distance L (about 50mm), at this time the control rod drive line pressure test device simulates the S-shaped misalignment of the core, such as Figure 6 As shown; When the first (starting from the top) deformation control device uses the controller to drive the electric push rod to retract, the electric push rod drives the pressure barrel segment to move, generating a distance of -L (about -50mm); the second deformation control device uses the controller to drive the upper electric push rod to extend, the electric push rod drives the pressure barrel segment to move, generating a distance of L (about 50mm); the third deformation control device uses the controller to drive the lower electric push rod to retract, the electric push rod drives the pressure barrel segment to move, generating a distance of -L (about -50mm); the fourth deformation control device does not move. At this time, the control rod drive line pressure test device simulates the W-shaped misalignment of the core, such as Figure 7 shown.

[0040] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A high-temperature gas-cooled reactor control rod drive line test device, comprising a vertically arranged pressure vessel, characterized in that: It also includes a deformation control device. The pressure vessel is a multi-degree-of-freedom pressure vessel. The top of the multi-degree-of-freedom pressure vessel is connected to the foundation through a mounting flange, and a sealing flange cover is installed at the bottom. The multi-degree-of-freedom pressure vessel has a deformation unit. The deformation unit includes a pressure cylinder and an expansion joint installed between the pressure cylinders. The deformation control device is connected to the pressure cylinder in the deformation unit and controls the displacement of the pressure cylinder.

2. The high temperature gas-cooled reactor control rod drive line test device according to claim 1, characterized in that: The expansion joint is an angular expansion joint or an axial expansion joint or a combination of an angular expansion joint and an axial expansion joint.

3. The high temperature gas-cooled reactor control rod drive line test device according to claim 2, characterized in that: The invention also includes a supporting device, which is connected to the foundation and to the pressure-bearing cylinder under the axial expansion joint and supports the pressure-bearing cylinder.

4. The high temperature gas-cooled reactor control rod drive line test device according to claim 3, characterized in that: The supporting device comprises a support ear fixed on the pressure-bearing cylinder and a linear slide slidably connected to the support ear, and the linear slide is fixed on the foundation.

5. The high temperature gas-cooled reactor control rod drive line test device according to claim 4, characterized in that: The deformation control device is connected to the pressure-bearing cylinder with the support ears to control the horizontal displacement of the pressure-bearing cylinder.

6. The high temperature gas-cooled reactor control rod drive line test device according to claim 1, characterized in that: The deformation control device includes a hinge seat, a fixed bracket, an electric push rod and a controller; the fixed bracket is fixed on the foundation, the hinge seat is fixed on the wall of the pressure cylinder, one end of the electric push rod is fixed on the hinge seat, and the other end is connected to the fixed bracket through a hinge joint. The controller is used to control the extension or shortening of the electric push rod.

7. The high temperature gas-cooled reactor control rod drive line test device according to claim 2, characterized in that: The angular expansion joint and the axial expansion joint in the deformation unit are arranged at intervals between the pressure-bearing cylinders.

8. The high temperature gas-cooled reactor control rod drive line test device according to claim 1, characterized in that: Three circles of threaded holes are set on the mounting flange. Screws pass through the outer circle of threaded holes to be fixed to the foundation, screws pass through the middle circle of threaded holes to be connected to the simulated head, and screws pass through the inner circle of threaded holes to be connected to the pressure cylinder.

9. The high temperature gas-cooled reactor control rod drive line test device according to claim 1, characterized in that: Some pressure-bearing cylinders are equipped with welded connecting flanges to connect to the gas supply system.

10. A high temperature gas cooled reactor control rod drive line test method, characterized in that: Using the high-temperature gas-cooled reactor control rod drive line test device described in claims 1-9, the pressure-bearing cylinder connected to the deformation control device is controlled by the deformation control device to cause displacement, and the pressure container is deformed.

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