A control rod driving mechanism for a deep water pool heating reactor

Abstract

The present invention relates to a control rod drive mechanism for a deep-water pool heating reactor, comprising a drive assembly, a steel wire rope, a locking device and a drive rod assembly; the drive assembly is connected to the steel wire rope in a driving manner; the steel wire rope and the drive rod assembly are both connected to the locking device to achieve / disconnect the connection; the drive rod assembly is connected to the control rod assembly. The beneficial effects of the present invention are as follows: 1. The effective length of the steel wire rope is reduced by setting the drive rod assembly and the locking device, thereby solving the problem of the control rod assembly being unfavorable for rapid rod drop caused by the influence of the steel wire rope; 2. The steel wire ropes will not respond to each other through the setting of the outer cylinder wall; 3. The locking device and the drive rod assembly are automatically connected in a centering manner; 4. The rod position detection of the control rod assembly can be achieved through the rod position detection assembly; 5. The core irradiation dose received by the relevant components is reduced (e.g., components that are lifted above the water surface or need to be placed in the reactor hall).

Description

Technical Field

[0001] The invention relates to the field of nuclear engineering, and in particular to a control rod driving mechanism for a deep water pool type heating reactor. Background Art

[0002] The control rod drive mechanism is an important device to ensure the safety of the reactor. Different reactor types have different types of control rod drive mechanisms. Because the pool reactor is immersed in a deep water pool, the existing mature drive mechanism cannot directly meet the use requirements; the existing pool nuclear reactors in China have low power, few control rod drive mechanisms, and the pool water depth is not as deep as the pool heating reactor. Therefore, the deep water pool heating reactor is not simply an enlargement of the original small power pool reactor. The key equipment in the reactor, such as the control rod drive mechanism, cannot fully adapt to the deep water pool heating reactor. In-depth design innovation is needed to promote the development of the deep water pool heating reactor.

[0003] There is no precedent for the use of deep-water pool-type (pool water depth>20 meters) heating reactors in China. The construction of this type of reactor requires a control rod drive mechanism that adapts to its characteristics. Due to the limitation of the length of the drive rod when using the mature technology of the pressurized water reactor control rod drive mechanism, when used in a deep-water pool-type heating reactor, the entire drive mechanism needs to be immersed in the reactor water pool. A large number of coils and cables on the drive mechanism need to be waterproofed and sealed. In addition, there are many external cables and the length of the cables is long, which is not conducive to the layout of the entire reactor and the disassembly and assembly of the equipment. The maximum power of the existing pool-type reactor is 5MW, the pool depth is about 10 meters, and the number of control rod drive mechanisms is small. When the control rod assembly is quickly dropped, the upper end of the wire rope is disconnected from the drive assembly, and the lower end should be connected to the control rod assembly and fall with the wire rope. If this structure is used in a reactor with a deeper pool, the effective length of the wire rope is longer, which is not conducive to the rapid drop of the control rod assembly.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] In view of the defects existing in the prior art, the object of the present invention is to provide a control rod drive mechanism for a deep water pool type heating reactor, which at least solves the problem that the excessive length of the wire rope is not conducive to the rapid drop of the control rod assembly.

[0006] The technical solution of the present invention is as follows:

[0007] A control rod drive mechanism for a deep water pool heating reactor comprises a drive assembly, a steel wire rope, a locking device and a drive rod assembly; the drive assembly is drivingly connected to the steel wire rope; the steel wire rope and the drive rod assembly are both connected to the locking device to realize / disconnect connection; the drive rod assembly is connected to the control rod assembly.

[0008] Furthermore, the above-mentioned deep water pool type heating reactor control rod drive mechanism also includes a rod position detection assembly; the rod position detection assembly cooperates with the drive rod assembly to reflect the position of the control rod assembly.

[0009] Furthermore, in the above-mentioned deep water pool type heating reactor control rod drive mechanism, the rod position detection assembly is a detection coil; and at least a part of the drive rod assembly is a magnetic conductor that cooperates with the detection coil.

[0010] Furthermore, the above-mentioned deep water pool type heating reactor control rod drive mechanism also includes a reversing mechanism; the steel wire rope is connected to the locking device after passing around the reversing mechanism.

[0011] Furthermore, the above-mentioned deep water pool type heating reactor control rod drive mechanism also includes an ascending cylinder; the rod position detection assembly is installed on the outside of the ascending cylinder, and the locking device can move along the ascending cylinder in the ascending cylinder.

[0012] Furthermore, in the above-mentioned deep water pool type heating reactor control rod drive mechanism, the drive assembly is arranged not directly above the control rod assembly.

[0013] Furthermore, in the above-mentioned deep water pool heating reactor control rod drive mechanism, the drive rod assembly is connected to the control rod assembly via a detachable joint.

[0014] Furthermore, in the above-mentioned deep water pool heating reactor control rod drive mechanism, the locking device is an electromagnet assembly.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. The effective length of the wire rope is reduced by setting the driving rod assembly and the locking device, thereby solving the problem of the control rod assembly being unfavorable for rapid rod drop caused by the influence of the wire rope;

[0017] 2. Through the setting of the outer cylinder wall, the steel wire ropes will not affect each other;

[0018] 3. The locking device and the driving rod assembly are automatically connected in the center;

[0019] 4. The rod position detection component can realize the rod position detection of the control rod assembly;

[0020] 5. Reduce the core irradiation dose to relevant components (e.g., components that are lifted above the water surface or need to be placed in the reactor hall). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the control rod drive mechanism of the deep water pool type heating reactor of the present invention.

[0022] In the above drawings, 1. drive assembly; 2. reversing mechanism; 3. wire rope; 4. rising cylinder; 5. locking device; 6. drive rod assembly; 7. rod position detection assembly; 8. detachable joint; 9. control rod assembly. DETAILED DESCRIPTION

[0023] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0024] like Figure 1 As shown, the present invention provides a control rod drive mechanism for a deep water pool type heating reactor, comprising a drive assembly 1, a steel wire rope 3, a locking device 5 and a drive rod assembly 6; the drive assembly 1 is drivingly connected to the steel wire rope 3; the steel wire rope 3 and the drive rod assembly 6 are both connected to the locking device 5 to realize / disconnect the connection; the drive rod assembly 6 is connected to the control rod assembly. The rod position detection assembly 7 cooperates with the drive rod assembly 6 to reflect the position of the control rod assembly. In this embodiment, the rod position detection assembly 7 is a detection coil; at least a portion of the drive rod assembly 6 is a magnetic conductor that cooperates with the detection coil. When the magnetic conductor moves in the detection coil, the coil senses a signal, thereby reflecting the position of the control rod assembly.

[0025] The control rod drive mechanism of the deep-water pool heating reactor of the present invention also includes a reversing mechanism 2; the steel wire rope 3 is connected to the locking device 5 after passing around the reversing mechanism 2. In this way, the drive assembly 1 does not need to be arranged directly above the control rod assembly 9, so as to achieve free arrangement according to space, which helps to ensure a compact structure. After reversing, the steel wire rope 3 goes vertically downward along the center of the drive mechanism and is connected to the locking device 5 at the lower end. When receiving a signal, the locking device 5 connects the steel wire rope 3 to the head of the drive rod assembly 6, and the lower end of the drive rod is connected to the control rod assembly. When the locking device 5 loses the signal (meeting the fault protection principle), the drive rod assembly 6 and the control rod assembly fall by their own weight to realize the function of rapid rod drop; the drive assembly 1 drives the steel wire rope 3 to move to realize the function of lifting, lowering and maintaining the control rod assembly.

[0026] This embodiment also includes an ascending tube 4; the rod position detection assembly 7 is installed on the outside of the ascending tube 4, and the locking device 5 can move along the ascending tube 4 in the ascending tube 4. The driving assembly 1 is arranged not directly above the control rod assembly. The driving rod assembly 6 is connected to the control rod assembly 9 through a detachable joint 8. The detachable joint 8 is connected / disconnected by a special tool, thereby realizing the connection / disconnection of the driving rod assembly 6 and the control rod assembly 9. The ascending tube 4 can prevent the steel wire rope 3 from affecting the driving rod assembly 6. In addition, the cooperation of the locking device 5 and the ascending tube 4 helps to realize the automatic centering connection of the steel wire rope 3 and the driving rod assembly 6. The locking device 5 adopts an electromagnet assembly, which can control the engagement of components including the weight of the control rod assembly 9 with the steel wire rope 3 with a small electromagnetic force; or, the locking device 5 of this embodiment can also adopt a pneumatic locking assembly or other devices that can achieve the same function.

[0027] The control rod driving mechanism of the present invention has the characteristics of simple structure, easy installation, convenient maintenance, good economy, etc. A reversing mechanism 2 is provided. When the steel wire rope 3 passes through the reversing mechanism 2, the driving assembly 1 does not have to be placed directly above the control rod assembly 9, which is conducive to the arrangement of the driving assembly 1 above the water pool. The driving assembly 1 is placed above the reactor water pool, and the working environment of the driving assembly 1 is good and the equipment life is long. A locking device 5 is provided between the steel wire rope 3 and the driving rod assembly 6. Under the accident condition, the locking device 5 is opened to release the driving rod assembly 6, and the control rod assembly 9 is not affected by the steel wire rope 3, thereby reducing the rod drop time and realizing the safe shutdown of the reactor under the accident condition. The rising cylinder 4 isolates the steel wire rope 3, and the steel wire ropes 3 do not affect each other during the movement, thereby preventing interference from affecting the movement of the control rod assembly 9. At the same time, the locking device 5 can be automatically connected in the center under the constraint of the inner wall of the rising cylinder 4. A section of the driving rod assembly 6 has a magnetic conductivity function, so that the coil induces a signal, thereby reflecting the position of the control rod assembly. Increasing the length of the driving rod can increase the distance between the locking device 5 and the steel wire rope 3 and the core, thereby reducing the radiation dose received by the locking device 5 and the steel wire rope 3.

[0028] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A control rod drive mechanism for a deep water pool heating reactor, characterized in that: The invention comprises a driving assembly (1), a reversing mechanism (2), a steel wire rope (3), a locking device (5) and a driving rod assembly (6); the driving assembly (1) is drivingly connected to the steel wire rope (3); the steel wire rope (3) passes around the reversing mechanism (2) and after reversing, it goes vertically downward along the center of the driving mechanism and is connected to the locking device (5) at the lower end; the locking device (5) connects the steel wire rope (3) to the head of the driving rod assembly (6) when receiving a signal, and the lower end of the driving rod assembly (6) is connected to the control rod assembly (9); when the locking device (5) loses the signal, the driving rod assembly (6) and the control rod assembly (9) fall down by their own weight, thereby realizing a rapid rod drop function; the driving assembly (1) drives the steel wire rope (3) to move, thereby realizing the functions of lifting, lowering and holding the control rod assembly (9); the driving assembly (1) is arranged not directly above the control rod assembly (9), thereby realizing free arrangement and ensuring a compact structure.

2. The control rod drive mechanism of the deep water pool heating reactor according to claim 1, characterized in that: It also comprises a rod position detection assembly (7); the rod position detection assembly (7) cooperates with the drive rod assembly (6) to reflect the position of the control rod assembly.

3. The control rod drive mechanism of the deep water pool heating reactor according to claim 2, characterized in that: The rod position detection component (7) is a detection coil; at least a portion of the driving rod component (6) is a magnetic conductor that cooperates with the detection coil.

4. The control rod drive mechanism of the deep water pool heating reactor according to claim 2, characterized in that: It also includes an ascending cylinder (4); the rod position detection assembly (7) is installed on the outside of the ascending cylinder (4); and the locking device (5) is capable of moving inside the ascending cylinder (4) along the ascending cylinder (4).

5. The control rod drive mechanism of a deep water pool heating reactor according to any one of claims 1 to 3, characterized in that: The drive rod assembly (6) is connected to the control rod assembly (9) via a detachable joint (8).

6. The control rod drive mechanism of a deep water pool heating reactor according to any one of claims 1 to 3, characterized in that: The locking device (5) is an electromagnet assembly or a pneumatic locking assembly.

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