Tool for centering electrical penetration assembly and embedded sleeve of nuclear power station

Abstract

The utility model belongs to a centering tool, and particularly relates to a tool for centering an electrical penetration assembly and an embedded sleeve of a nuclear power station. The tool for centering the electrical penetration assembly and the embedded sleeve of the nuclear power station comprises an annular part installation supporting ring and an adjusting supporting ring which are concentric and are arranged in an equal-diameter mode, the installation supporting ring and the adjusting supporting ring are fixedly connected, an installation bolt is arranged on the installation supporting ring, and an adjusting bolt is arranged on the adjusting supporting ring. The device has the remarkable effects that the device is basically made of waste engineering materials, so that the manufacturing cost is low, and the device can be repeatedly utilized. By means of the special tool for hoisting the electrical penetration assembly, the centering efficiency of the electrical penetration assembly and the embedded sleeve can be greatly improved, and a supporting platform does not need to be specially erected. When the special tool for hoisting the electrical penetration assembly is used for hoisting one electrical penetration assembly, 4.4 labor can be saved every day, and the cost is converted into about 720 yuan.

Description

Technical Field

[0001] This new type belongs to centering tools, and specifically relates to a tool for centering electrical penetrations and embedded sleeves in nuclear power plants. Background Art

[0002] Electrical penetrations are special electrical equipment installed on the containment of the reactor building in a nuclear power plant, providing electrical connections for various conductors to penetrate the containment wall. At the same time, as part of the containment, they form the third barrier to prevent the leakage of radioactive substances and ensure the integrity of the containment.

[0003] There are 148 low-voltage electrical penetrations in the VVER-1000 reactor type, with a weight of 0.4 tons, an outer diameter of the welded flange of 325 mm, an outer diameter of the cylinder body of 273 mm, an outer diameter of the embedded sleeve of the low-voltage penetration of 325 mm, and an inner diameter of 300 mm. The height of the reactor building in the VVER-1000 reactor type is 8 meters, with a double-layer containment. The embedded sleeves of the electrical penetrations are distributed at different elevations on the inner containment of the reactor building. The distance from the welding groove of the embedded sleeve of the low-voltage electrical penetration to the containment is 150 mm. During the installation of the electrical penetration, it is necessary to pass the cylinder body of the electrical penetration through the corresponding embedded sleeve of the electrical penetration, align the welding groove of the welded flange of the electrical penetration with the welding groove of the embedded sleeve of the electrical penetration on the circumference, and ensure a 2-mm gap (referred to as "centering") to meet the welding requirements of the welded flange of the electrical penetration and the embedded sleeve of the electrical penetration.

[0004] Since the outer diameter of the cylinder body of the low-voltage electrical penetration is 27 mm different from the inner diameter of the embedded sleeve, after the cylinder body of the electrical penetration passes through the embedded sleeve, the welded flange of the electrical penetration and the welded flange of the embedded sleeve are not aligned and cannot meet the welding requirements. If a support platform is erected to support the electrical penetration, the following problems mainly exist:

[0005] 1) The erection of the platform requires professional scaffolding erectors, increasing the workload and coordination difficulty of the installation of the electrical penetration;

[0006] 2) The reactor building has a narrow space, and items such as pipelines, brackets, equipment, and cable trays are arranged closely. The erection of the support platform is difficult, and the erected platform is difficult to be adjusted to meet the centering requirements of the electrical penetration;

[0007] 3) There are many electrical penetrations with a large mass. For each penetration installation, a support platform needs to be erected for adjustment and centering, reducing the installation efficiency and increasing the safety risk. Summary of the Utility Model

[0008] This new type aims at the defects of the existing technology and provides a tool for centering electrical penetrations and embedded sleeves in nuclear power plants.

[0009] The present innovation is realized as follows: A tool for aligning an electrical penetration in a nuclear power plant with a pre-embedded casing, which includes an annular part installation support ring and an adjustment support ring that are concentric and have the same diameter. The installation support ring and the adjustment support ring are fixedly connected to each other. Installation bolts are provided on the installation support ring, and adjustment bolts are provided on the adjustment support ring.

[0010] For a tool for aligning an electrical penetration in a nuclear power plant with a pre-embedded casing as described above, the installation support ring and the adjustment support ring are fixedly connected through a connecting plate.

[0011] For a tool for aligning an electrical penetration in a nuclear power plant with a pre-embedded casing as described above, 4 installation bolts are provided and are evenly arranged along the circumferential direction of the installation support ring.

[0012] For a tool for aligning an electrical penetration in a nuclear power plant with a pre-embedded casing as described above, 4 adjustment bolts are provided and are evenly arranged along the circumferential direction of the adjustment support ring.

[0013] For a tool for aligning an electrical penetration in a nuclear power plant with a pre-embedded casing as described above, 3 connecting plates are provided and are evenly arranged between the installation support ring and the adjustment support ring.

[0014] For a tool for aligning an electrical penetration in a nuclear power plant with a pre-embedded casing as described above, the outer diameter of the installation support ring is 340 mm, the width is 50 mm, and the thickness is 6 mm; the outer diameter of the adjustment support ring is 340 mm, the width is 50 mm, and the thickness is 6 mm.

[0015] For a tool for aligning an electrical penetration in a nuclear power plant with a pre-embedded casing as described above, the connecting plate is 50 mm long, 40 mm wide, and 6 mm thick.

[0016] The remarkable effect of the present innovation is that the manufacturing materials of this device are basically waste engineering materials, with low manufacturing costs, and the device can be reused. Using a special tool for hoisting electrical penetrations can greatly improve the alignment efficiency of electrical penetrations and pre-embedded casings, and there is no need to specially set up a support platform. Using a special tool for hoisting electrical penetrations to hoist one electrical penetration can save 4.4 man-days of labor, which is converted into a cost of approximately 720 yuan. Description of the Drawings

[0017] Figure 1 Three-dimensional structure diagram of the tool for aligning an electrical penetration with a pre-embedded casing;

[0018] Figure 2 Left view of the tool for aligning an electrical penetration with a pre-embedded casing;

[0019] Figure 3 Top view of the tool for aligning an electrical penetration with a pre-embedded casing;

[0020] Figure 4 Schematic diagram of the alignment tool for electrical penetrators and embedded sleeves.

[0021] In the figure: 1. Installation support ring, 2. Installation bolt, 3. Adjustment support ring, 4. Connection plate, 5. Adjustment bolt, 6. Welding flange of electrical penetrator, 7. End plate of electrical penetrator, 8. Containment of reactor building, 9. Electrical penetrator against embedded sleeve. Detailed implementation method

[0022] A tool for aligning electrical penetrators and embedded sleeves in nuclear power plants, with the following composition and functions:

[0023] The alignment tool for electrical penetrators and embedded sleeves consists of 1 installation support ring with an outer diameter of 340 mm, a width of 50 mm, and a thickness of 6 mm, 1 adjustment support ring with an outer diameter of 340 mm, a width of 50 mm, and a thickness of 6 mm, 3 connection plates with a length of 50 mm, a width of 40 mm, and a thickness of 6 mm; 8 threaded sleeves with an outer diameter of 20 mm, an inner diameter of 16 mm, and a length of 10 mm; 4 full-thread hexagonal M16*60 installation bolts; and 4 full-thread hexagonal M16*90 adjustment bolts.

[0024] The installation support ring is used to support the alignment tool installed on the embedded sleeve of the penetrator. Four holes with a diameter of 18 mm are drilled in the installation support ring, and the angles between the four round holes on the installation support ring are all 90 degrees.

[0025] The adjustment support ring is used to support the adjustment of the position of the welding flange of the penetrator. Four holes with a diameter of 18 mm are drilled in the adjustment support ring, and the angles between the four round holes on the installation support ring are all 90 degrees.

[0026] The three connection plates connect the installation support ring and the adjustment support ring of the tool to form a whole, transfer the force of the adjustment support ring to the installation support ring, and form three welding windows between the installation support ring and the adjustment support ring. When the electrical penetrator and the embedded sleeve are aligned and fixed through the alignment tool, the welder spot-welds and fixes the welding flange of the penetrator and the embedded sleeve through the three welding windows.

[0027] Eight threaded sleeves are respectively welded on the round holes of the installation support ring and the adjustment support ring. The angles between the threaded sleeves are all 90 degrees on the installation support ring and the adjustment support ring. Four installation bolts fix the installation support ring on the embedded sleeve of the penetrator through the threaded sleeves. Four adjustment bolts adjust the position of the welding flange of the electrical penetrator through the threaded sleeves installed on the adjustment support plate.

[0028] The three-dimensional structure diagram of the alignment tool for electrical penetrators and embedded sleeves is shown in Figure 1 .

[0029] The left view of the alignment tool for electrical penetrators and embedded sleeves is shown inFigure 2 .

[0030] The top view of the electrical penetration and embedded bushing alignment tool is shown in Figure 3 .

[0031] The usage is roughly as follows:

[0032] Step 1: In the reactor plant, install the electrical penetration and embedded casing alignment tool on the embedded casing of the penetration that is 150mm long beyond the containment, put the installation support ring of the tool on the embedded casing, and use a spanner to adjust the four M16*60 hexagonal bolts on the installation support ring so that the installation support ring hugs the outer circle of the embedded casing.

[0033] Step 2: From the reactor containment, insert the electrical penetration tube into the embedded casing, and adjust the depth of the tube into the casing by hand-pushing. The depth dimension is required to be adjusted until there is a 2mm gap between the blunt edge of the penetration welding flange and the blunt edge of the embedded casing welding groove on the circumference.

[0034] Step 3: Use an adjustable wrench to adjust the four M16*90 hexagonal bolts on the support ring so that the support ring can hold the end plate of the electrical penetration tube tightly, support the electrical penetration and adjust the circumferential position. The circumferential position should be adjusted so that the blunt edge of the penetration welding flange is aligned with the blunt edge of the embedded sleeve welding groove on the circumference;

[0035] Step 4: The welding personnel spot-weld the welding flange of the penetration piece to the embedded casing through three welding windows. After the electrical penetration piece is fixed by electric welding, the adjustable wrench is used to adjust the four M16*60 hexagonal bolts on the support ring and the adjustment support ring respectively, and the centering tool is removed.

[0036] See the schematic diagram of the electrical penetration and embedded bushing alignment tool for Figure 4 .

[0037] Tool making

[0038] According to the force of the tool, carbon steel pipes with an outer diameter of 340mm and a wall thickness of 6mm, carbon steel plates with a thickness of 6mm, and internal threaded casings with an outer diameter of 20mm and an inner diameter of 16mm are selected. The materials are cut according to the dimensions on the drawing and then assembled by welding.

[0039] The effects of this application are as follows:

[0040] The manufacturing materials of the device are basically waste engineering materials, the manufacturing cost is low, and the device can be reused. The manufacturing cost is as follows:

[0041]

[0042] The use of special tools for lifting electrical penetrations can greatly improve the centering efficiency of electrical penetrations and embedded bushings, and there is no need to set up a special support platform. After the improvement, the lifting of an electrical penetration can reduce the working hours and convert them into economic efficiency as shown in the following table:

[0043]

[0044]

[0045] Comparison results: Using special tools for lifting electrical penetrations can save 4.4 man-days to lift an electrical penetration, which translates into a cost of about RMB 720.

[0046] The VVER reactor type has a total of 148 low-voltage electrical penetrations, which generate direct economic benefits of approximately:

[0047] 148×720-300=106260 yuan.

[0048] Moreover, the use of a special tool for aligning electrical penetrations with embedded casings eliminates the need to set up a special support platform, avoiding the installation team being constrained by the progress of platform construction and resulting in downtime and waiting; it reduces the back and forth movement of electrical penetrations during the alignment process, reduces the risk of paint damage to the electrical penetration barrel during the alignment process, saves costs, and reduces construction safety risks. The tool is easy to use and has high alignment efficiency.

[0049] This tool can be widely used in aligning electrical penetrations and embedded casings in nuclear power plants with Hualong One, AP1000 and other reactor types.

Claims

1. A tool for aligning electrical penetrations and embedded bushings in nuclear power plants, characterized in that: The invention comprises a concentric and equal-diameter annular component mounting support ring (1) and an adjusting support ring (2), wherein the mounting support ring (1) and the adjusting support ring (2) are fixedly connected, a mounting bolt (2) is arranged on the mounting support ring (1), and an adjusting bolt (5) is arranged on the adjusting support ring (2).

2. A tool for aligning electrical penetrations and embedded bushings in a nuclear power plant according to claim 1, characterized in that: The installation support ring (1) and the adjustment support ring (2) are fixedly connected via a connecting plate (4).

3. A tool for aligning electrical penetrations and embedded bushings in a nuclear power plant as claimed in claim 2, characterized in that: Four mounting bolts (2) are arranged evenly along the circumference of the mounting support ring (1).

4. A tool for aligning electrical penetrations and embedded bushings in a nuclear power plant as claimed in claim 3, characterized in that: Four adjusting bolts (5) are arranged evenly along the circumference of the adjusting support ring (2).

5. A tool for aligning electrical penetrations and embedded bushings in a nuclear power plant as claimed in claim 4, characterized in that: Three connecting plates (4) are provided and are evenly arranged between the mounting support ring (1) and the adjusting support ring (2).

6. A tool for aligning electrical penetrations and embedded bushings in a nuclear power plant as claimed in claim 5, characterized in that: The mounting support ring (1) has an outer diameter of 340 mm, a width of 50 mm, and a thickness of 6 mm; the adjusting support ring (2) has an outer diameter of 340 mm, a width of 50 mm, and a thickness of 6 mm.

7. A tool for aligning electrical penetrations and embedded bushings in a nuclear power plant as claimed in claim 6, characterized in that: The connecting plate (4) is 50 mm long, 40 mm wide and 6 mm thick.

Images