A nuclear fuel assembly storage rack storage compartment repair device

Abstract

The present invention discloses a nuclear fuel assembly storage rack storage compartment repair device, specifically relating to the technical field of nuclear fuel operation and storage systems during nuclear power plant commissioning. The device comprises an expansion unit and a hydraulic unit. The expansion unit comprises a support module and a hydraulic module. The support module comprises a second support plate and a support shaft. The second support plate is a plate-like structure with a support shaft provided at the center of the plate surface. The hydraulic module comprises a first support plate and a hydraulic cylinder. The first support plate is a plate-like structure with a hydraulic cylinder provided at the center of the plate surface. The hydraulic cylinder is an overall cylindrical structure with a cylindrical hole provided at the center. The hydraulic unit comprises a hydraulic pump connected to the hydraulic cylinder via a hydraulic pipe. The device has a compact design, simple structure, and reliable functionality. It meets the operational requirements of narrow and long storage compartments, improves repair efficiency, reduces the proportion of disabled storage compartments, and saves production costs.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear fuel operation and storage system during the commissioning of a nuclear power plant, and in particular relates to a nuclear fuel assembly storage grid storage compartment repair device. Background Art

[0002] A nuclear fuel assembly storage rack is a nuclear safety-grade device in a nuclear power plant, used for long-term storage of spent fuel assemblies or short-term storage of new fuel assemblies. Its key component is a rectangular storage chamber. A single chamber is approximately 4425mm long, with an internal cross-section of approximately 222mm*222mm. Nuclear fuel assembly storage racks come in various sizes. One nuclear fuel assembly storage rack is composed of m*n storage chambers (generally, 5≤m, n≤11). A spent fuel pool typically contains 20-30 nuclear fuel assembly storage racks, with the gaps between each rack less than 100mm. Therefore, workers cannot directly enter the storage chambers or the gaps between the racks.

[0003] During nuclear power plant installation and commissioning, functional testing of nuclear fuel assembly storage racks requires insertion and removal tests using simulated fuel assemblies measuring 219mm*219mm*4500mm within storage cells. The simulated fuel assemblies must be able to move freely and smoothly across the entire length of the storage cell without obstruction, with an insertion and removal force (friction) ≤ 250N. Practical experience shows that due to manufacturing errors, deformation during transportation and hoisting, and verticality errors during on-site installation, the interior of the storage cells is uneven, often resulting in abnormal insertion and removal forces exceeding the specified limit. Due to the space and structural characteristics of the nuclear fuel assembly storage rack installation, repairing faulty storage racks is difficult. A common solution is to disable the problematic storage cell. Disabling a small number of cells will not impact nuclear power plant installation and commissioning. However, if a large number of cells are disabled, this will impact the storage planning of spent fuel assemblies. Therefore, repair work on the storage cells is necessary. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art and provide a nuclear fuel assembly storage rack storage compartment repair device to solve the problem that the interior of the storage compartment is uneven, resulting in poor insertion and removal of nuclear fuel assemblies.

[0005] In order to solve the above problems, the technical solution of the present invention is as follows: A nuclear fuel assembly storage rack storage chamber repair device, the device includes an expansion part and a hydraulic part, the expansion part includes a support module and a hydraulic module, the support module includes a second support plate and a support shaft, the second support plate is a plate-like structure, and a support shaft is provided at the center of the plate surface; the hydraulic module includes a first support plate and a hydraulic cylinder, the first support plate is a plate-like structure, and a hydraulic cylinder is provided at the center of the plate surface, the hydraulic cylinder is a cylindrical structure as a whole, and a cylindrical hole is provided in the center; the hydraulic part includes a hydraulic pump, and the hydraulic pump is connected to the hydraulic cylinder through a hydraulic pipe.

[0006] A first lifting lug is provided on the first supporting plate.

[0007] A second lifting lug is provided on the second supporting plate.

[0008] The support shaft is divided into an upper part and a lower part, and both the upper part and the lower part are cylindrical structures. The radius of the upper cylinder is smaller than the radius of the lower cylinder.

[0009] The diameter of the upper cylinder of the support shaft matches the diameter of the central cylindrical hole of the hydraulic cylinder.

[0010] The hydraulic pipe is connected to the hydraulic pump through a one-way valve.

[0011] A pressure gauge is provided on one side of the one-way valve.

[0012] The significant effect of the present invention is that a nuclear fuel assembly storage rack storage chamber repair device forms a support and restoration device for the storage chamber through two support plates and a hydraulic power source. The device is compact in design, simple in structure, and reliable in function. It meets the operational requirements under the narrow and long conditions of the storage chamber, improves the repair efficiency, reduces the disabled proportion of the storage chamber, and saves production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the expansion portion of a nuclear fuel assembly storage rack storage compartment repair device according to the present invention;

[0014] Figure 2 This is a schematic diagram of the use of a nuclear fuel assembly storage rack storage compartment repair device according to the present invention;

[0015] Figure 3 This is a schematic structural diagram of a support module of a nuclear fuel assembly storage grid storage compartment repair device according to the present invention;

[0016] Figure 4 This is a schematic structural diagram of a hydraulic module of a nuclear fuel assembly storage rack storage compartment repair device according to the present invention;

[0017] Figure 5This is a schematic structural diagram of the hydraulic part of a nuclear fuel assembly storage rack storage compartment repair device according to the present invention;

[0018] In the figure: 1. Hydraulic cylinder; 2. First support plate; 3. Hydraulic pipe; 4. First lifting eye; 5. Second lifting eye; 6. Support shaft; 7. Second support plate; 8. Hydraulic pump; 9. Pressure gauge; 10. One-way valve; 11. Storage chamber. DETAILED DESCRIPTION

[0019] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of the present invention.

[0020] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0022] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "connect," "dispose," "install," "fix," etc. should be understood in a broad sense. For example, they may refer to fixed connection, detachable connection, or integral connection; they may refer to direct connection, indirect connection through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0023] like Figure 1-5 As shown, a nuclear fuel assembly storage rack storage compartment repair device includes an expansion portion and a hydraulic portion. The expansion portion includes a support module and a hydraulic module. The support module includes a second support plate 7 and a support shaft 6. The second support plate 7 is a plate-like structure with a support shaft 6 provided at the center of the plate surface. The support shaft 6 is an overall conical structure. Specifically, the support shaft 6 is divided into an upper portion and a lower portion. Both the upper portion and the lower portion are cylindrical structures. The radius of the upper cylinder is smaller than the radius of the lower cylinder. The second support plate 7 is also provided with a second lifting lug 5 on its surface.

[0024] The hydraulic module includes a first support plate 2 and a hydraulic cylinder 1. The first support plate 2 is a plate-shaped structure, and the hydraulic cylinder 1 is provided at the center of the plate surface. The hydraulic cylinder 1 is an overall cylindrical structure with a cylindrical hole provided in the center. The diameter of the cylindrical hole matches the diameter of the upper cylinder of the support shaft 6, so that the upper part of the support shaft 6 can be tightly inserted into the hydraulic cylinder 1. A hydraulic hole is opened in the middle and lower part of the hydraulic cylinder 1, which is connected to the hydraulic module through a hydraulic pipe 3. A first lifting lug 4 is also provided on the surface of the first support plate 2.

[0025] The hydraulic unit includes a hydraulic pump 8, a pressure gauge 9, and a one-way valve 10. One end of the one-way valve 10 is connected to the hydraulic pump 8, the other end is connected to the hydraulic module via the hydraulic pipe 3, and another end is connected to the pressure gauge 9. When the one-way valve 10 is in operation, the hydraulic pressure generated by the hydraulic pump 8 flows to the hydraulic cylinder 1 through the one-way valve 10 and the hydraulic pipe 3 in sequence, and cannot flow back to the hydraulic pump 8.

[0026] A nuclear fuel assembly storage rack storage compartment repair device includes the following operating steps:

[0027] Step 1: Connect the one-way valve 10 to the hydraulic pump 8, and connect the hydraulic pump 8 to the hydraulic cylinder 1 through the hydraulic pipe 3;

[0028] Step 2: Combine the support module and the hydraulic module. Specifically, insert the support shaft 6 into the hydraulic cylinder 1 and adjust the support module and the hydraulic module so that the first lifting eye 4 and the second lifting eye 5 are on the same side.

[0029] Step 3: Use a rope, tie one end firmly to the first lifting lug 4 and the second lifting lug 5, and fix the other end of the rope in a secure place to prevent the expansion part from falling into the storage chamber 11 during operation;

[0030] Step 4: Use a rope to hang the expansion part into the position of the cavity of the storage chamber 11 that needs to be repaired. After the expansion part reaches the designated position, use the rope to adjust the posture of the expansion part.

[0031] Step 5: Tighten the one-way valve 10 and slowly manually pressurize the hydraulic pump 8;

[0032] Step 6: When the pressure reaches 10MPa, 15MPa and 18MPa respectively, each stage pressure value is maintained for 10 seconds, and the one-way valve 10 is released;

[0033] Step 7: Rotate the expansion part 90 degrees and repeat steps 5 and 6;

[0034] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A nuclear fuel assembly storage rack storage compartment repair device, characterized by: The device comprises an expansion part and a hydraulic part, wherein the expansion part comprises a support module and a hydraulic module, wherein the support module comprises a second support plate (7) and a support shaft (6), wherein the second support plate (7) is a plate-shaped structure, and a support shaft (6) is provided at the center of the plate surface; wherein the hydraulic module comprises a first support plate (2) and a hydraulic cylinder (1), wherein the first support plate (2) is a plate-shaped structure, and a hydraulic cylinder (1) is provided at the center of the plate surface; wherein the hydraulic cylinder (1) is a cylindrical structure as a whole, and a cylindrical hole is provided at the center; wherein the hydraulic part comprises a hydraulic pump (8), and wherein the hydraulic pump (8) is connected to the hydraulic cylinder (1) via a hydraulic pipe (3); The support shaft (6) is divided into an upper part and a lower part, both of which are cylindrical structures, and the radius of the upper cylinder is smaller than the radius of the lower cylinder; The diameter of the upper cylindrical body of the support shaft (6) matches the diameter of the central cylindrical hole of the hydraulic cylinder (1); The hydraulic pipe (3) is connected to the hydraulic pump (8) via a one-way valve (10).

2. A nuclear fuel assembly storage rack storage compartment repair device according to claim 1, characterized in that: A first lifting lug (4) is provided on the first supporting plate (2).

3. The nuclear fuel assembly storage rack storage compartment repair device according to claim 1, characterized in that: A second lifting lug (5) is provided on the second supporting plate (7).

4. A nuclear fuel assembly storage rack storage compartment repair device according to claim 3, characterized in that: A pressure gauge (9) is provided on one side of the one-way valve (10).

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