An experimental device for emergency rod drop of a hydraulic drive system for reactor control rods

Abstract

The present invention provides an emergency rod-drop experiment device for a hydraulic drive system of a reactor control rod, belonging to the technical field of experimental research on control rod drive mechanisms of nuclear reactors. It solves the problem that the control rod of the traditional drive mechanism cannot act continuously. It includes a circulation pipeline system, a measurement system, a pressure relief system, a drive system and a control rod. The circulation pipeline system mainly provides the driving force for the whole device and completes the forced circulation of the whole device. The measurement system can obtain the working state of the whole drive device under experimental conditions. The control rod is arranged inside the drive system and connected to the detection device. When the emergency rod-drop experiment device loses power, the pressure relief system starts to work, causing the control rod to freely fall into the water tank. It is mainly used to simulate the data parameters of the control rod drop when the power supply of the power plant is cut off and some equipment fails.

Description

Technical Field

[0001] The invention belongs to the technical field of experimental research on a nuclear reactor control rod driving mechanism, and in particular relates to an emergency rod-dropping experimental device for a reactor control rod hydraulic driving system. Background Art

[0002] Nuclear reactor control rods and their drive systems are critical equipment, responsible for startup, power regulation, shutdown, and even emergency shutdown in the event of an accident. Their proper operation is directly related to reactor safety. Actuation methods include mechanical, magnetic, electric, and hydraulic. The ability of the control rod drive system to rapidly drop the rods within a specified timeframe under emergency conditions—known as the rod drop method—is a crucial performance metric. The rod drop method is a commonly used method for measuring various reactivity effects in reactors, but it requires careful consideration of spatial effects. Otherwise, even small reactivity can generate significant spatial effects. Emergency conditions can be categorized into two types: one involving manual rapid rod drop, in which all components operate normally and generally meet requirements; the other involves a complete plant power outage, paralyzing all components and deactivating the system, resulting in a rapid drop of the control rods.

[0003] The control rod drive mechanism in a conventional drive mechanism control rod experiment is connected to the control rod assembly. By energizing electromagnetic coils in a specific sequence, the control rod assembly is inserted and raised, thereby controlling the average core temperature for safe reactor startup, power regulation, and shutdown. However, conventional drive mechanism control rod experiment systems are prone to problems such as delayed control rod drop, sticking, and ejection. Specifically, conventional control rod experiment systems cannot guarantee continuous control rod movement during operation, making it impossible to obtain accurate data on the timing and displacement of the control rod drop. Summary of the Invention

[0004] In view of this, the present invention aims to propose an emergency rod drop test device for a reactor control rod hydraulic drive system to solve the problem that the traditional drive mechanism control rod test device cannot move continuously, resulting in the inability to accurately measure the time and displacement data of the emergency rod drop test device when the rod is dropped.

[0005] To achieve the above object, the present invention adopts the following technical solutions: An emergency rod drop experiment device for a reactor control rod hydraulic drive system, which includes a circulation system, a pressure relief system, a measurement system, a drive system and a control rod. The circulation system includes an inlet circulation pipeline, an outlet circulation pipeline, a variable frequency pump, a three-way steering pneumatic valve, a water storage tank and a stepping motor. The output end of the stepping motor is connected to the input end of the variable frequency pump. The three-way steering pneumatic valve includes a first connection port, a second connection port and a third connection port. One end of the water storage tank is connected to one end of the variable frequency pump through the inlet circulation pipeline. The other end of the variable frequency pump is connected to the first connection port of the three-way steering pneumatic valve through the inlet circulation pipeline. The third connection port of the three-way steering pneumatic valve is connected to the lower part of the drive system through the inlet circulation pipeline. The other end of the water storage tank is connected to the upper part of the drive system through the outlet circulation pipeline. The pressure relief system includes an inlet pressure relief pipeline and an outlet pressure relief pipeline. The second connection port of the three-way steering pneumatic valve is connected to the upper part of the drive system through the inlet pressure relief pipeline. The outlet pressure relief pipeline is connected to the lower part of the drive system. The measurement system is respectively connected to the inlet circulation pipeline, the outlet circulation pipeline and the outlet pressure relief pipeline. The drive system includes a drive cylinder body and a piston assembly. The piston assembly is arranged inside the drive cylinder body. A through hole is arranged at the center of the piston assembly. The control rod is arranged inside the drive cylinder body and is connected to the piston assembly. The control rod is connected to the measurement system..

[0006] Further, the inlet circulation pipeline includes an inlet pipe section, an inlet rising pipe section and an inlet horizontal pipe section. One end of the inlet pipe section is connected to the water storage tank, and the other end is connected to one end of the variable frequency pump. The other end of the variable frequency pump is connected to the inlet horizontal pipe section through the inlet rising pipe section. The inlet horizontal pipe section is connected to the first connection port of the three-way steering pneumatic valve and is connected to the lower part of the drive device through the third connection port of the three-way steering pneumatic valve.

[0007] Further, an inlet section stop valve is arranged on the inlet pipe section.

[0008] Further, the outlet circulation pipeline includes an outlet pipe section and an outlet descending pipe section. One end of the outlet pipe section is connected to the upper part of the drive system, and the other end is connected to the water storage tank through the outlet descending pipe section.

[0009] Further, an outlet stop valve is arranged on the outlet descending pipe section.

[0010] Further, the inlet pressure relief pipeline includes a pressure relief inlet rising pipe and a pressure relief inlet horizontal pipe. One end of the pressure relief inlet rising pipe is connected to the second connection port of the three-way steering pneumatic valve, and the other end is connected to the pressure relief inlet horizontal pipe. The other end of the pressure relief inlet horizontal pipe is connected to the upper part of the drive system.

[0011] Furthermore, the outlet pressure relief pipeline includes a pressure relief outlet horizontal pipe and a pressure relief outlet descending pipe. One end of the pressure relief outlet horizontal pipe is connected to the drive system, and the other end is connected to the pressure relief outlet descending pipe. A pressure relief outlet pneumatic valve is provided on the pressure relief outlet descending pipe, and the pressure relief outlet descending pipe is connected to the measurement system.

[0012] Furthermore, the top of the drive cylinder body is connected to the measurement system. The control rod is arranged at the central position inside the drive cylinder body. One side of the drive cylinder body is respectively connected to a pressure relief inlet horizontal pipe and an inlet horizontal pipe section, and the other side of the drive cylinder body is respectively connected to an outlet pipe section and a pressure relief outlet horizontal pipe.

[0013] Furthermore, the measurement system includes an inlet pressure sensor, an inlet electromagnetic flowmeter, an outlet pressure sensor, an outlet electromagnetic flowmeter, a drain electromagnetic flowmeter, a Hall current sensor, and a pull rope displacement sensor. The inlet pressure sensor is arranged on the inlet rising pipe section. The inlet electromagnetic flowmeter is arranged on the pipeline connecting the three-way interface of the three-way turning pneumatic valve and the drive device. The outlet pressure sensor and the outlet electromagnetic flowmeter are both arranged on the outlet pipe section. The drain electromagnetic flowmeter is arranged on the pressure relief outlet descending pipe. The Hall current sensor is arranged on the top of the drive cylinder body, and the pull rope displacement sensor is connected to the control rod.

[0014] Furthermore, the circulation pipeline, the inlet pressure relief pipeline, and the outlet pressure relief pipeline are all connected through elbows or flanges.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. The present invention uses water pressure as the power of the control rod drive system, which has a simple structure, low manufacturing cost, and stable working characteristics compared with traditional drive mechanisms or systems.

[0017] 2. The present invention uses a stepping motor as the action signal controller, and controls the working state of the entire drive system of the emergency rod dropping device by whether the stepping motor is powered on or off. When the stepping motor fails, the variable frequency pump stops working, and under the action of the system pressure, it can still maintain a stable state without sticking or ejecting the rod accidents.

[0018] 3. There is only one continuously moving component, i.e., the variable frequency pump, in the entire drive system of the emergency rod dropping device of the present invention. Compared with traditional drive mechanisms or systems, the number of continuously moving components is greatly reduced, making the entire mechanism or system have higher safety.

[0019] 4. The present invention can conduct multiple repeated experiments to fully simulate the data parameters of the control rod dropping when the power supply of the entire power plant is cut off and some equipment fails.

[0020] 5. Most components of the system of the present invention are connected using devices such as flange plates, bolts, and elbows, which facilitates disassembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which form a part of the present invention, are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 is a schematic diagram of the overall structure of an emergency rod-drop experiment device for a hydraulic drive system of a reactor control rod according to the present invention

[0023] Figure 2 is a rod-drop parameter diagram of an emergency rod-drop experiment device for a hydraulic drive system of a reactor control rod according to the present invention.

[0024] In the figure:

[0025] 1-1, inlet pipe section; 1-2, inlet section stop valve; 1-3, variable-frequency pump; 1-4, inlet rising pipe section; 1-5, inlet horizontal pipe section; 1-6, three-way steering pneumatic valve; 1-7, outlet pipe section; 1-8, outlet descending pipe section; 1-9, outlet stop valve; 1-10, water storage tank; 1-11, stepping motor; 2-1, inlet pressure sensor; 2-2, inlet electromagnetic flowmeter; 2-3, outlet pressure sensor; 2-4, outlet electromagnetic flowmeter; 2-5, drain electromagnetic flowmeter; 2-6, Hall current sensor; 2-7, rope displacement sensor; 3-1, pressure relief inlet rising pipe; 3-2, pressure relief inlet horizontal pipe; 3-3, pressure relief outlet horizontal pipe; 3-4, pressure relief outlet pneumatic valve; 3-5, pressure relief outlet descending pipe; 4-1, drive cylinder body; 4-2, piston assembly; 5, control rod. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention may be combined with each other. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments.

[0027] See Figure 1Description of this embodiment: A hydraulic drive system emergency rod drop experiment device for a reactor control rod, which includes a circulation system, a pressure relief system, a measurement system, a drive system, and a control rod 5. The circulation system mainly provides the driving force for the entire experimental device, completes the forced circulation of the entire experimental device, and is also the pressure-bearing boundary of the entire experimental device. The circulation system includes an inlet circulation pipeline, an outlet circulation pipeline, a variable-frequency pump 1-3, a three-way steering pneumatic valve 1-6, a water storage tank 1-10, and a stepping motor 1-11. The output end of the stepping motor 1-11 is connected to the input end of the variable-frequency pump 1-3. The stepping motor 1-11 provides the initial power for the emergency rod drop experiment device. The three-way steering pneumatic valve 1-6 includes a one-way interface, a two-way interface, and a three-way interface. One end of the water storage tank 1-10 is connected to one end of the variable-frequency pump 1-3 through the inlet circulation pipeline. The other end of the variable-frequency pump 1-3 is connected to the one-way interface of the three-way steering pneumatic valve 1-6 through the inlet circulation pipeline. The three-way interface of the three-way steering pneumatic valve 1-6 is connected to the lower part of the drive system through the inlet circulation pipeline. The other end of the water storage tank 1-10 is connected to the upper part of the drive system through the outlet circulation pipeline. The pressure relief system includes an inlet pressure relief pipeline and an outlet pressure relief pipeline. The two-way interface of the three-way steering pneumatic valve 1-6 is connected to the upper part of the drive system through the inlet pressure relief pipeline. The outlet pressure relief pipeline is connected to the lower part of the drive system. The measurement system is respectively connected to the inlet circulation pipeline, the outlet circulation pipeline, and the outlet pressure relief pipeline. The drive system includes a drive cylinder main body 4-1 and a piston assembly 4-2. The piston assembly 4-2 is arranged inside the drive cylinder main body 4-1. A through hole is provided in the center of the piston assembly 4-2. The through hole provided in the center of the piston assembly 4-2 is used to ensure the pressure balance inside the drive cylinder main body 4-1. The control rod 5 is arranged inside the drive cylinder main body 4-1 and is connected to the piston assembly 4-2. The control rod 5 is connected to the measurement system. The measurement system connected to the control rod 5 is used to measure the displacement and time of the control rod 5 during its fall. The water storage tank 1-10 is used to simulate a nuclear reactor.

[0028] The described circulation system is connected from one end of the water storage tank 1-10 to one connection interface of the three-way steering pneumatic valve 1-6 through the inlet circulation pipeline. The inlet circulation pipeline is connected to one end of the drive system through the three-way interface of the three-way steering pneumatic valve 1-6. The other end of the drive system is connected to the other end of the water storage tank 1-10 through the outlet circulation pipeline. When the system is operating normally, the one connection interface and the three-way interface of the three-way steering pneumatic valve 1-6 are in the open state, so that the inside of the emergency rod drop test device circulates. The measurement system is responsible for monitoring the pressure and flow rate in the circulation pipeline. When the stepping motor 1-11 is powered off, the emergency rod drop test device receives the emergency rod drop command, the variable frequency pump 1-3 stops working, the pressure inside the circulation pipeline is lost, the pressure relief system starts to work, and the pressure inside the drive system is lost. When the pressure inside the drive system is less than the self-weight of the control rod 5, the control rod 5 vertically drops into the water storage tank 1-10 under the action of gravity. At the same time, the measurement system connected to the control rod 5 drops together with the control rod 5 and is responsible for measuring the time and displacement during the dropping process of the control rod 5. The water in the water storage tank 1-10 buffers the control rod 5. In the present invention, the driving pressure inside the entire emergency rod drop test device can be changed by adjusting the frequency of the variable frequency pump 1-3, so as to realize the research on the dropping of the control rod 5 under different driving forces.

[0029] The described inlet circulation pipeline includes an inlet pipe section 1-1, an inlet rising pipe section 1-4, and an inlet transverse pipe section 1-5. One end of the inlet pipe section 1-1 is connected to the water storage tank 1-10, and the other end is connected to one end of the variable frequency pump 1-3. The other end of the variable frequency pump 1-3 is connected to the inlet transverse pipe section 1-5 through the inlet rising pipe section 1-4. The inlet transverse pipe section 1-5 is connected to one connection interface of the three-way steering pneumatic valve 1-6 and is connected to the lower part of the drive device through the three-way interface of the three-way steering pneumatic valve 1-6.

[0030] An inlet section stop valve 1-2 is provided on the inlet pipe section 1-1. The inlet section stop valve 1-2 is in the open state under the normal working condition of the emergency rod drop test device, and the inlet section stop valve 1-2 closes when the emergency rod drop test device receives the rod drop command.

[0031] The described outlet circulation pipeline includes an outlet pipe section 1-7 and an outlet descending pipe section 1-8. One end of the outlet pipe section 1-7 is connected to the upper part of the drive system, and the other end is connected to the water storage tank 1-10 through the outlet descending pipe section 1-8.

[0032] An outlet stop valve 1-9 is provided on the outlet descending pipe section 1-8. The outlet stop valve 1-9 is in the open state under the normal working condition of the emergency rod drop test device, and the outlet stop valve 1-9 closes when the emergency rod drop test device receives the rod drop command.

[0033] The described circulation system is connected from one end of the water storage tank 1-10 to the variable frequency pump 1-3 through the inlet pipe section 1-1. The variable frequency pump 1-3 is connected to one connection interface of the three-way steering pneumatic valve 1-6 through the inlet rising pipe section 1-4 and the inlet transverse pipe section 1-5, and is connected to one end of the drive system through the three-way interface of the three-way steering pneumatic valve 1-6. The other end of the drive system is connected to the water storage tank 1-10 through the outlet pipe section 1-7 and the outlet descending pipe section 1-8, obtaining the circulation system of the entire emergency rod drop test device. A measurement system is arranged on the circulation system to monitor the pressure and flow rate in the circulation pipeline.

[0034] The described inlet pressure relief pipeline includes a pressure relief inlet rising pipe 3-1 and a pressure relief inlet transverse pipe 3-2. One end of the pressure relief inlet rising pipe 3-1 is connected to the two-way interface of the three-way steering pneumatic valve 1-6, and the other end is connected to the pressure relief inlet transverse pipe 3-2. The other end of the pressure relief inlet transverse pipe 3-2 is connected to the upper part of the drive system.

[0035] The described outlet pressure relief pipeline includes a pressure relief outlet transverse pipe 3-3 and a pressure relief outlet descending pipe 3-5. One end of the pressure relief outlet transverse pipe 3-3 is connected to the drive system, and the other end is connected to the pressure relief outlet descending pipe 3-5. A pressure relief outlet pneumatic valve 3-4 is arranged on the pressure relief outlet descending pipe 3-5, and the pressure relief outlet descending pipe 3-5 is connected to the measurement system.

[0036] When the emergency rod drop experimental device receives the rod drop command, the variable frequency pump 1-3 stops working, the three-way interface of the three-way steering pneumatic valve 1-6 closes, the two-way interface opens, and the pressure relief outlet pneumatic valve 3-4 opens, so that the emergency rod drop experimental device stops circulating. At this time, there is still a small amount of pressure in the circulation pipeline. The pressure relief system relieves pressure through the two-way interface of the three-way steering pneumatic valve 1-6, the pressure relief inlet rising pipe 3-1, the pressure relief inlet transverse pipe 3-2, the pressure relief inlet transverse pipe 3-2, and the pressure relief outlet descending pipe 3-5, thereby reducing the pressure in the entire emergency rod drop experimental device. When the pressure in the drive system is less than the gravity of the control rod 5, the control rod 5 freely falls into the water storage tank 1-10 by gravity.

[0037] The top of the drive cylinder main body 4-1 is connected to the measurement system. The control rod 5 is arranged at the central position inside the drive cylinder main body 4-1. One side of the drive cylinder body 4-1 is respectively connected to the pressure relief inlet transverse pipe 3-2 and the inlet transverse pipe section 1-5. The other side of the drive cylinder body 4-1 is respectively connected to the outlet pipe section 1-7 and the pressure relief outlet transverse pipe 3-3. The drive system is the main part of the emergency rod drop experimental device. The drive cylinder main body 4-1 is made of stainless steel with a thickness of 0.4 mm and has a smooth inner wall. The upper and lower ends of the drive cylinder main body 4-1 are cold welded with flange plates, ensuring the sealing performance inside the drive cylinder main body.

[0038] The measuring system includes an inlet pressure sensor 2-1, an inlet electromagnetic flowmeter 2-2, an outlet pressure sensor 2-3, an outlet electromagnetic flowmeter 2-4, a leakage electromagnetic flowmeter 2-5, a Hall current sensor 2-6 and a pull rope displacement sensor 2-7. The inlet pressure sensor 2-1 is arranged on the inlet rising pipe section 1-4, and the inlet electromagnetic flowmeter 2-2 is arranged on the pipeline connecting the three-way interface of the three-way steering pneumatic valve 1-6 and the drive device. The inlet pressure sensor 2-1 and the inlet electromagnetic flowmeter 2-2 are mainly used to measure the pressure and flow of the drive system inlet. The outlet pressure sensor 2-3 and the outlet The electromagnetic flowmeters 2-4 are both installed on the outlet pipe section 1-7. The outlet pressure sensor 2-3 and the outlet electromagnetic flowmeter 2-4 are mainly used to measure the outlet pressure and flow of the drive system. The discharge electromagnetic flowmeter 2-5 is installed on the pressure relief outlet downcomer 3-5. The Hall current sensor 2-6 is installed on the top of the drive cylinder body 4-1. The pull-wire displacement sensor 2-7 is connected to the control rod 5. When the control rod 5 falls, the pull-wire displacement sensor 2-7 falls together with the control rod 5 and measures the displacement and time of the control rod 5 falling process. The measurement system can obtain the working status of the entire emergency rod-dropping device under the experimental state.

[0039] The circulation pipeline, the inlet pressure relief pipeline and the outlet pressure relief pipeline are all connected through elbows or flanges. The elbows and flanges are both made of stainless steel, and the pipelines connected by the elbows and flanges have good sealing properties.

[0040] See also Figure 2 To illustrate this embodiment, the emergency rod drop test apparatus of the present invention can be used for experiments on rod drop in a reactor control rod hydraulic drive system. When the control rod 5 loses power throughout the field, the temporal variation of the control rod 5's displacement during the drop process is measured. When the control rod velocity v = 0, the corresponding displacement of the control rod 5 is s = 0 mm. By comparing the rod drop formation L = 645 mm, it can be seen that after the control rod 5 falls into the water storage tank 1-10, the water in the water storage tank 1-10 acts as a buffer for the control rod 5.

[0041] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. An emergency rod dropping experiment device for a hydraulic drive system of a reactor control rod, characterized in that: It includes a circulation system, a pressure relief system, a measurement system, a drive system and a control rod (5). The circulation system includes an inlet circulation pipeline, an outlet circulation pipeline, a variable-frequency pump (1-3), a three-way steering pneumatic valve (1-6), a water storage tank (1-10) and a stepping motor (1-11). The output end of the stepping motor (1-11) is connected to the input end of the variable-frequency pump (1-3). The three-way steering pneumatic valve (1-6) includes a first connection port, a second connection port and a third connection port. One end of the water storage tank (1-10) is connected to one end of the variable-frequency pump (1-3) through the inlet circulation pipeline. The other end of the variable-frequency pump (1-3) is connected to the first connection port of the three-way steering pneumatic valve (1-6) through the inlet circulation pipeline. The third connection port of the three-way steering pneumatic valve (1-6) is connected to the lower part of the drive system through the inlet circulation pipeline. The other end of the water storage tank (1-10) is connected to the upper part of the drive system through the outlet circulation pipeline. The pressure relief system includes an inlet pressure relief pipeline and an outlet pressure relief pipeline. The second connection port of the three-way steering pneumatic valve (1-6) is connected to the upper part of the drive system through the inlet pressure relief pipeline. The outlet pressure relief pipeline is connected to the lower part of the drive system. The measurement system is connected to the inlet circulation pipeline, the outlet circulation pipeline and the outlet pressure relief pipeline. The drive system includes a drive cylinder main body (4-1) and a piston assembly (4-2). The piston assembly (4-2) is arranged inside the drive cylinder main body (4-1). A through hole is arranged at the center of the piston assembly (4-2). The control rod (5) is arranged inside the drive cylinder main body (4-1) and is connected to the piston assembly (4-2). The control rod (5) is connected to the measurement system.

2. The emergency rod drop experiment device for a hydraulic drive system of a reactor control rod according to claim 1, characterized in that: The inlet circulation pipeline includes an inlet pipe section (1-1), an inlet rising pipe section (1-4) and an inlet transverse pipe section (1-5). One end of the inlet pipe section (1-1) is connected to the water storage tank (1-10), and the other end is connected to one end of the variable-frequency pump (1-3). The other end of the variable-frequency pump (1-3) is connected to the inlet transverse pipe section (1-5) through the inlet rising pipe section (1-4). The inlet transverse pipe section (1-5) is connected to the first connection port of the three-way steering pneumatic valve (1-6) and is connected to the lower part of the drive device through the third connection port of the three-way steering pneumatic valve (1-6).

3. An emergency rod drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: An inlet section stop valve (1-2) is arranged on the inlet pipe section (1-1).

4. An emergency rod-drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: The outlet circulation pipeline includes an outlet pipe section (1-7) and an outlet descending pipe section (1-8). One end of the outlet pipe section (1-7) is connected to the upper part of the drive system, and the other end is connected to the water storage tank (1-10) through the outlet descending pipe section (1-8).

5. An emergency rod drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: An outlet stop valve (1-9) is arranged on the outlet descending pipe section (1-8).

6. An emergency rod drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: The inlet pressure relief pipeline includes a pressure relief inlet rising pipe (3-1) and a pressure relief inlet transverse pipe (3-2). One end of the pressure relief inlet rising pipe (3-1) is connected to the second connection port of the three-way steering pneumatic valve (1-6), and the other end is connected to the pressure relief inlet transverse pipe (3-2). The other end of the pressure relief inlet transverse pipe (3-2) is connected to the upper part of the drive system.

7. An emergency rod drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: The outlet pressure relief pipeline includes a pressure relief outlet horizontal pipe (3-3) and a pressure relief outlet downcomer (3-5). One end of the pressure relief outlet horizontal pipe (3-3) is connected to the drive system, and the other end is connected to the pressure relief outlet downcomer (3-5). A pressure relief outlet pneumatic valve (3-4) is provided on the pressure relief outlet downcomer (3-5), and the pressure relief outlet downcomer (3-5) is connected to the measurement system.

8. An emergency rod drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: The top of the drive cylinder body (4-1) is connected to the measurement system. The control rod (5) is arranged at the central position inside the drive cylinder body (4-1). One side of the drive cylinder body (4-1) is respectively connected to a pressure relief inlet horizontal pipe (3-2) and an inlet horizontal pipe section (1-5). The other side of the drive cylinder body (4-1) is respectively connected to an outlet pipe section (1-7) and a pressure relief outlet horizontal pipe (3-3).

9. An emergency rod drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: The measurement system includes an inlet pressure sensor (2-1), an inlet electromagnetic flowmeter (2-2), an outlet pressure sensor (2-3), an outlet electromagnetic flowmeter (2-4), a bleed electromagnetic flowmeter (2-5), a Hall current sensor (2-6), and a wire rope displacement sensor (2-7). The inlet pressure sensor (2-1) is arranged on the inlet riser pipe section (1-4). The inlet electromagnetic flowmeter (2-2) is arranged on the pipeline connecting the three-way interface of the three-way turning pneumatic valve (1-6) to the drive device. The outlet pressure sensor (2-3) and the outlet electromagnetic flowmeter (2-4) are both arranged on the outlet pipe section (1-7). The bleed electromagnetic flowmeter (2-5) is arranged on the pressure relief outlet downcomer (3-5). The Hall current sensor (2-6) is arranged on the top of the drive cylinder body (4-1). The wire rope displacement sensor (2-7) is connected to the control rod (5).

10. An emergency rod drop experiment device for a hydraulic drive system of a reactor control rod, characterized in that: The circulation pipeline, the inlet pressure relief pipeline, and the outlet pressure relief pipeline are all connected through elbows or flanges.

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