Positioning tool for nuclear power plant fuel assemblies

Abstract

The present invention provides a positioning tool for a nuclear power plant fuel assembly, comprising: a mounting base, the mounting base is used to be horizontally placed on the top of a storage grid of a spent fuel pool; a translation guide, the translation guide is arranged at the bottom of the mounting base, the translation guide is used to extend downward into a receiving groove of the storage grid to slide with the storage grid; a height adjustment frame, the height adjustment frame is arranged on the top of the mounting base; a telescopic drive device, the telescopic drive device is arranged on the height adjustment frame, the telescopic drive device has a force-applying end that is telescopic in the horizontal direction; a positioning push piece, the positioning push piece is arranged at the force-applying end, the positioning push piece is used to horizontally abut against a fuel assembly; a hoisting piece, the hoisting piece is arranged on the height adjustment frame. The present invention can realize the positioning function of the nuclear power plant fuel assembly during the poolside inspection process, and can be moved to multiple preset positions through the hoisting equipment to achieve mobility.

Description

Technical Field

[0001] The invention relates to the technical field of fuel assembly poolside inspection, in particular to a positioning tool for a nuclear power plant fuel assembly. Background Art

[0002] After irradiation, the fuel assemblies of nuclear power plants need to be inspected poolside to determine the effects of high-dose radiation, high temperature, and high-pressure environment in the reactor on the mechanical, creep, and radiation resistance properties of the fuel assemblies. The general practice is to install the poolside inspection equipment for post-irradiation fuel assemblies above the storage grids in the spent fuel pool, and then remove the fuel assemblies to be inspected from the storage grids in the spent fuel pool and hoist them to the storage grids to be inspected. Before the inspection, the fuel assemblies are in a suspended state, and the fuel assemblies need to be positioned to ensure that the fuel assemblies are in a fixed state so that the probe can be smoothly positioned on the surface of the fuel rods to be tested. At present, no fuel assembly positioning tools specifically used for storage grids have been found in China. The existing methods for inspecting and positioning fuel assemblies after irradiation do not have the conditions to realize the fuel assembly positioning function in the storage grids of the spent fuel pool. Summary of the invention

[0003] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a positioning tool for nuclear power plant fuel assemblies, which can realize the positioning function of nuclear power plant fuel assemblies during poolside inspection, thereby improving the data stability and operational safety of the fuel assemblies, and can be moved to multiple preset workstations through lifting equipment to achieve mobility, thereby not affecting other operations of the spent fuel pool of the nuclear power plant.

[0004] In order to solve the above technical problems, the present invention provides a positioning tool for a nuclear power plant fuel assembly, comprising:

[0005] A mounting base, the mounting base being used to be horizontally located on top of a storage grid of a spent fuel pool;

[0006] A translation guide, which is arranged at the bottom of the mounting base and is used to extend downward into the receiving groove of the storage grid to slide with the storage grid;

[0007] A height adjustment frame, the height adjustment frame is arranged on the top of the mounting base;

[0008] A telescopic drive device, the telescopic drive device is arranged on the height adjustment frame, and the telescopic drive device has a force-applying end that telescopes horizontally;

[0009] A positioning push piece, which is arranged at the force-applying end and is used to abut against a fuel assembly horizontally;

[0010] Lifting parts are installed on the height adjustment frame.

[0011] Preferably, the height adjustment frame comprises a bearing platform for mounting the telescopic driving device and the hoisting member, and the bearing platform is mounted on the mounting base via a plurality of telescopic support columns.

[0012] Preferably, the telescopic driving device comprises a driving mounting seat arranged on the height adjustment frame and a telescopic cylinder arranged on the driving mounting seat.

[0013] Preferably, the hanging member is composed of a handle component.

[0014] Preferably, the translation guide is in the form of a rectangular parallelepiped structure, and the bottom of the rectangular parallelepiped structure has a chamfered guide structure for entering the storage rack.

[0015] Preferably, the positioning and pushing member comprises a flat plate portion, and plate wing portions are provided on opposite sides of the flat plate portion.

[0016] Preferably, the mounting base is a flat plate structure.

[0017] As described above, the positioning tool for the nuclear power plant fuel assembly of the present invention has the following beneficial effects: In the present invention, the positioning tool for the nuclear power plant fuel assembly adopts a design form that can be adapted to the storage grid of the spent fuel pool of the nuclear power plant, realizes the positioning and fixing function of the fuel assembly when the fuel assembly is in a suspended state, and can be applied to the poolside inspection of the fuel assembly. Specifically, the positioning tool includes a mounting base and a translation guide designed for the storage grid of the spent fuel pool, and the installation position of the mounting base and the translation guide can be changed according to the needs of the site, and the positioning and fixing function of the fuel assembly is realized in combination with the storage grid of the spent fuel pool and the telescopic drive device of the positioning tool itself. In addition, a height-adjustable height adjustment frame is provided for fuel assemblies of different vertical span sections. With such a configuration, the telescopic drive device can also realize the positioning function of different vertical parts of the fuel assembly, meeting the poolside inspection requirements of different span sections of the fuel assembly. Therefore, the positioning tool for nuclear power plant fuel assemblies of the present invention can realize the positioning function of nuclear power plant fuel assemblies during poolside inspection, thereby improving the data stability and operational safety of the fuel assemblies, and can be moved to a preset workstation through lifting equipment without affecting other operations of the spent fuel pool of the nuclear power plant. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Shown is a front view of a positioning tool for a nuclear power plant fuel assembly according to the present invention;

[0019] Figure 2 A top view of a positioning tool for a nuclear power plant fuel assembly according to the present invention is shown;

[0020] Figure 3 A schematic diagram showing the use of the positioning tool for nuclear power plant fuel assemblies of the present invention is shown.

[0021] Component number description

[0022] 1 Storage rack

[0023] 2 Fuel assemblies

[0024] 3 Mounting base

[0025] 4 Translation guide

[0026] 5 Height adjustment rack

[0027] 51 Loading platform

[0028] 52 Telescopic support column

[0029] 6 Telescopic drive device

[0030] 61 Drive Mount

[0031] 62 Telescopic Cylinder

[0032] 7 Positioning push piece

[0033] 8 Lifting parts DETAILED DESCRIPTION

[0034] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0035] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0036] like Figure 1 , Figure 2 as well as Figure 3 As shown, in order to solve the above technical problems, the present invention provides a positioning tool for a nuclear power plant fuel assembly, comprising:

[0037] A mounting base 3, the mounting base 3 is used to be horizontally located on the top of a storage grid 1 of a spent fuel pool;

[0038] A translation guide 4, which is disposed at the bottom of the mounting base 3, and is used to extend downward into the receiving groove of the storage grid 1 to slide with the storage grid 1;

[0039] A height adjustment frame 5, the height adjustment frame 5 is arranged on the top of the mounting base 3;

[0040] A telescopic driving device 6, which is arranged on the height adjustment frame 5, and has a force-applying end that is telescopic in the horizontal direction;

[0041] A positioning push piece 7, which is arranged at the force application end and is used to abut against the fuel assembly 2 horizontally;

[0042] A hanging member 8 is provided on the height adjustment frame 5 .

[0043] In the present invention, the positioning tool for the fuel assembly of the nuclear power plant adopts a design form that can be adapted to the storage grid of the spent fuel pool of the nuclear power plant, so as to realize the positioning and fixing function of the fuel assembly 2 when the fuel assembly 2 is in a suspended state, and can be applied to the poolside inspection of the fuel assembly 2. Specifically, the positioning tool includes a mounting base 3 and a translation guide 4 designed for the storage grid 1 of the spent fuel pool, and the mounting positions of the mounting base 3 and the translation guide 4 can be changed according to the needs of the site, and the positioning and fixing function of the fuel assembly 2 is realized by combining the storage grid 1 of the spent fuel pool and the telescopic drive device 6 of the positioning tool itself. In addition, a height-adjustable height adjustment frame 5 is provided for the fuel assemblies 2 of different vertical span sections. With such a configuration, the telescopic drive device 6 can also realize the positioning function of different vertical parts of the fuel assembly 2, so as to meet the poolside inspection requirements of the fuel assembly 2 of different span sections.

[0044] like Figure 3 As shown, a field operation method as a positioning tool for the above-mentioned nuclear power plant fuel assembly:

[0045] First, the lifting end of the lifting equipment of the nuclear power plant fuel building is connected to the lifting part 8 of the positioning tool, so as to lift the positioning tool as a whole to the top of the preset position of the storage grid 1 of the spent fuel pool; then, the lifting end of the lifting equipment is lowered, so that the positioning tool as a whole is lowered until the translation guide 4 enters the designated receiving groove of the storage grid 1 and the mounting base 3 is completely located on the storage grid 1 of the spent fuel pool. Next, the fuel assembly 2 is lifted to the front of the positioning push piece 7 of the positioning tool by the lifting equipment of the nuclear power plant fuel building; then, the fuel assembly 2 is lowered so that the part of the fuel assembly 2 that needs to be abutted (such as the grid of the fuel assembly 2) is horizontally aligned with the positioning push piece 7. Finally, the telescopic drive device 6 is started, so that the force-applying end of the telescopic drive device 6 extends toward the fuel assembly 2 until the positioning push piece 7 contacts the fuel assembly 2 and applies a certain force, thereby realizing the positioning and fixing function of the fuel assembly 2. In addition, the operation process of releasing the fuel assembly 2 is opposite to the positioning and fixing process, that is, first drive the telescopic drive device 6 until the positioning push member 7 is separated from the fuel assembly 2, and then remove the fuel assembly 2 through the lifting equipment of the nuclear power plant fuel plant, and finally remove the above-mentioned positioning tool through the lifting equipment.

[0046] Therefore, the positioning tool for the nuclear power plant fuel assembly of the present invention can realize the positioning function of the nuclear power plant fuel assembly 2 during the poolside inspection process, thereby improving the data stability and operational safety of the fuel assembly 2, and can be moved to a preset workstation through lifting equipment without affecting other operations of the spent fuel pool of the nuclear power plant.

[0047] In order to simplify the structure of the height adjustment frame 5 , the height adjustment frame 5 includes a support platform 51 for mounting the telescopic driving device 6 and the hanging member 8 . The support platform 51 is mounted on the mounting base 3 through a plurality of telescopic support columns 52 .

[0048] In order to realize the horizontal pushing function of the telescopic drive device 6, the telescopic drive device 6 includes a drive mounting seat 61 arranged on the height adjustment frame 5 and a telescopic cylinder 62 arranged on the drive mounting seat 61. The telescopic cylinder 62 can be a pneumatic cylinder, a hydraulic cylinder, or a motor-driven telescopic cylinder.

[0049] The above-mentioned hanging member 8 is composed of a handle component. The handle component can be U-shaped.

[0050] In order to facilitate the translation guide 4 to be inserted into the receiving groove of the top opening of the storage rack 1, the translation guide 4 is a rectangular parallelepiped structure, and the bottom of the rectangular parallelepiped structure has a chamfered guide structure for entering the storage rack. In addition, the bottom guide structure of the translation guide 4 can also be a latch structure, and the latches are distributed at the four corners of the bottom of the translation guide 4.

[0051] In order to enable the positioning and pushing member 7 to effectively exert force on the fuel assembly 2, the positioning and pushing member 7 includes a flat plate portion, and plate wing portions are provided on opposite sides of the flat plate portion.

[0052] In order to improve the stability of the mounting base 3, the mounting base 3 is in a flat plate structure.

[0053] In summary, the positioning tool for nuclear power plant fuel assemblies of the present invention can realize the positioning function of nuclear power plant fuel assemblies during the pool inspection process, thereby improving the data stability and operational safety of the fuel assemblies, and can be moved to multiple preset positions through hoisting equipment to achieve mobility, thereby not affecting other operations of the spent fuel pool of the nuclear power plant. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0054] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A positioning tool for a nuclear power plant fuel assembly, characterized in that: include: A mounting base (3), the mounting base (3) being used to be horizontally located on the top of a storage grid (1) of a spent fuel pool; A translation guide (4), the translation guide (4) being arranged at the bottom of the mounting base (3), the translation guide (4) being used to extend downward into the receiving groove of the storage grid (1) so as to slideably cooperate with the storage grid (1); A height adjustment frame (5), the height adjustment frame (5) is arranged on the top of the mounting base (3); A telescopic drive device (6), the telescopic drive device (6) being arranged on the height adjustment frame (5), and the telescopic drive device (6) having a force-applying end that telescopes horizontally; A positioning push piece (7), the positioning push piece (7) being arranged at the force application end, and the positioning push piece (7) being used for horizontally abutting against a fuel assembly (2); A hanging member (8), the hanging member (8) being arranged on the height adjustment frame (5); The height adjustment frame (5) comprises a bearing platform (51) for mounting the telescopic driving device (6) and the hanging member (8); the bearing platform (51) is mounted on the mounting base (3) via a plurality of telescopic support columns (52); The telescopic driving device (6) comprises a driving mounting seat (61) arranged on the height adjustment frame (5) and a telescopic cylinder (62) arranged on the driving mounting seat (61); The translation guide (4) is in the form of a rectangular parallelepiped structure, and the bottom of the rectangular parallelepiped structure has a chamfered guide structure for entering the storage rack.

2. The positioning tool for nuclear power plant fuel assembly according to claim 1, characterized in that: The hanging component (8) is composed of handle parts.

3. The positioning tool for nuclear power plant fuel assembly according to claim 1, characterized in that: The positioning and pushing member (7) comprises a flat plate portion, and plate wing portions are provided on opposite sides of the flat plate portion.

4. The positioning tool for nuclear power plant fuel assembly according to claim 1, characterized in that: The installation base (3) is a flat plate structure.

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