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Reactor control rod drive mechanism

A driving mechanism and control rod technology, applied in the control of nuclear reactions, reactors, reducing greenhouse gases, etc., can solve the problems of buffer shaft fracture failure, complex structure, assembly quality affecting the service life of the control rod driving mechanism, etc., to ensure accuracy and the effect of effectiveness

Active Publication Date: 2016-12-07
NUCLEAR POWER INSTITUTE OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, a control rod drive mechanism with a life of more than 15 million steps has been manufactured, such as the ML-B type (ACP1000) control rod drive mechanism, but the life test performance verification of the ML-B type (ACP1000) control rod drive mechanism When running to 15.12 million steps, the life of the drive mechanism is terminated due to the failure of the buffer shaft in the hook assembly. In other types of control rod drive mechanisms, the buffer shaft is also a weak part, and the service life of the buffer shaft directly restricts the performance of the drive mechanism. Service life; At the same time, in the existing control rod driving mechanism, due to the need to set a special cooling system to cool the coil assembly, this makes the existing control rod driving mechanism larger in size, complex in structure, difficult to install and maintain; further, The sealing shell assembly is used as a pressure-resistant component in the control rod drive mechanism. The manufacturing and assembly quality of the seal shell assembly directly affects the service life of the control rod drive mechanism

Method used

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Experimental program
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Effect test

Embodiment 1

[0038] Such as Figure 1 to Figure 6 As shown, the reactor control rod driving mechanism includes a sealed casing assembly 3, a travel sleeve 1 fixedly connected to the sealed casing assembly 3, a coil assembly 4 set on the sealed casing assembly 3, and a claw set in the pressure casing assembly Component 5, the sealing shell component 3 includes a sealing shell and a tube base, and the sealing shell and the tube base are in an integrated structure.

[0039] Specifically, in the prior art, the sealing shell assembly 3 in the control rod driving mechanism only includes the sealing shell, that is, the tube base is independent of the control rod driving mechanism, and the tube base is welded to the pressure vessel when the pressure vessel is manufactured, so in During the installation of the control rod drive mechanism, welding personnel need to complete the welding of the pipe seat and the sealing shell at the installation site. Moreover, in the prior art, the sealing shell and...

Embodiment 2

[0042] Such as Figure 1 to Figure 6 As shown, this embodiment is further limited on the basis of Embodiment 1: as a specific implementation of the hook assembly 5, the hook assembly 5 includes a buffer shaft 56 and a moving armature 53, and the buffer shaft 56 and the moving armature 53 are cylindrical structures, the shape of the buffer shaft 56 is a stepped shaft, the inner hole of the moving armature 53 is a step hole, the moving armature 53 is sleeved on the outside of the buffer shaft 56, and the outside of the buffer shaft 56 The reducing section of the moving armature 53 and the reducing section in the inner hole of the moving armature 53 are in a positive relationship. When the buffer shaft 56 and the moving armature 53 are in relative motion, the above two reducing sections contact each other to limit the buffer shaft 56 and the moving armature 53. The relative position of the buffer shaft 56 is connected with the smaller diameter end of the buffer shaft 56 through r...

Embodiment 3

[0052] The present embodiment is further limited on the basis of the technical solution provided in embodiment 1: as Figure 1 to Figure 6 As shown, the coil assembly 4 includes an inner skeleton 41 and an outer shell 42 both in a cylindrical structure, and an annular cavity for accommodating the coil winding 43 is formed between the outer shell 42 and the inner skeleton 41, and the inner The skeleton 41 is located in the inner hole of the outer casing 42;

[0053] The inner frame 41 and the outer shell 42 both include a main body made of metal and a cut-off groove 45 arranged on the main body. On the rear end face, the cut-off groove 45 on the outer shell 42 runs through the inner and outer walls and the front and rear end faces of the outer shell 42 .

[0054] In this scheme, the inner frame 41 and the outer shell 42 are metal main parts and the flow break groove 45 provided on the main body constitutes the cylindrical structure of the inner frame 41 and the outer shell 42,...

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Abstract

The invention discloses a reactor control rod drive mechanism, comprising a sealing shell assembly, a travel sleeve fixedly connected with the sealing shell assembly, a coil assembly sleeving the sealing shell assembly, and a claw assembly arranged in a pressure-resistant shell assembly; the sealing shell assembly includes a sealing shell and a tube seat that are integrated. In the scheme, the sealing shell and the tube seat are integrated, and welding of the sealing shell and tube seat that is required to connect the control rod drive mechanism and a pressure container is omitted; in this way, a whole nuclear reactor takes less time to manufacture and assemble and is short of a nuclear-grade 1 weld seam as compared with the prior art, and the omission of the weld seam helps reduce the leakage risk; therefore, the above structure enables prolonged service life for the control rod drive mechanism and greatly reduced work for on-duty examination of a CRDM (control rod device mechanism).

Description

technical field [0001] The invention relates to the technical field of nuclear reactor components, in particular to a reactor control rod driving mechanism. Background technique [0002] With the development of nuclear power, the proportion of nuclear power generation has increased, and the proportion of nuclear power participating in peak regulation has increased. The PWR nuclear power plant mainly adjusts the power of the core through rod adjustment and boron adjustment, and then participates in the peak shaving work, and the control rod drive mechanism plays an extremely important role in the power adjustment of the PWR. [0003] In the prior art, a control rod drive mechanism with a life of more than 15 million steps has been manufactured, such as the ML-B type (ACP1000) control rod drive mechanism, but the life test performance verification of the ML-B type (ACP1000) control rod drive mechanism When running to 15.12 million steps, the life of the drive mechanism is ter...

Claims

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Application Information

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IPC IPC(8): G21C7/14
CPCG21C7/14Y02E30/30
Inventor 喻杰朱清李泽文刘茂福
Owner NUCLEAR POWER INSTITUTE OF CHINA
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