Rod type liquid level meter mounting device for nuclear power plant

Abstract

The invention relates to the technical field of nuclear power plant rod-type liquid level meter installation, and discloses a nuclear power plant rod-type liquid level meter installation device which comprises a measurement supporting piece, a rod-type liquid level meter installation base, a rod-type liquid level meter installation base and a rod-type liquid level meter installation base. The measurement installation assembly is fixedly connected to the measurement supporting piece, an installation part is arranged on the measurement installation assembly, the installation part extends in the length direction of the measurement supporting piece, and the installation part is suitable for being fixedly installed on a nuclear power plant building through an external locking piece. By arranging the mounting part extending in the length direction of the measurement supporting piece, the height position of the rod type liquid level meter can still be continuously adjusted after the rod type liquid level meter is installed, field installation errors can be effectively compensated or the rod type liquid level meter can adapt to changes of measurement requirements, and therefore the situation that holes are formed in a building structure again for height adjustment is avoided; and the installation error can be made up through height fine adjustment, so that the configuration modification requirement of the distributed control system caused by the change of the measuring range of the instrument is reduced.

Description

Technical Field

[0001] This invention relates to the field of rod-type liquid level gauge installation technology in nuclear power plants, and specifically to an installation device for rod-type liquid level gauges in nuclear power plants. Background Technology

[0002] Nuclear power plant operation relies heavily on precise automated monitoring systems to ensure the safety and stability of nuclear reactors, cooling systems, and other critical equipment. High-precision, reliable rod-type level gauges, such as guided wave radar level gauges and capacitive level gauges, are typically used for liquid level measurement in nuclear power plants to monitor changes in liquid level in real time, providing crucial data support for the plant's automated control systems.

[0003] In existing technologies, rod-type level gauges in nuclear power plants are installed using fixed brackets. During operation, due to installation errors, changes in process flow, and dynamic adjustments to measurement requirements, it is frequently necessary to modify critical information such as the measurement range and alarm thresholds of the gauges, necessitating adjustments to the installation height of the rod-type level gauges. Furthermore, height adjustments require recalibration and commissioning of the entire measurement system. Each height adjustment can trigger a series of chain reactions, leading to corresponding modifications to the distributed control system (DCS) configuration information. Modifying DCS configuration information not only requires specialized technical personnel but is also a complex process; errors can potentially affect the normal operation of the entire nuclear power plant's automation control and monitoring systems. Summary of the Invention

[0004] In view of this, the present invention provides a rod-type liquid level gauge installation device for nuclear power plants, to solve the problem that in the prior art, after the installation height of the rod-type liquid level gauge in a nuclear power plant is fixed, it needs to be disassembled and the height adjusted before reinstallation due to factors such as the measurement range and alarm threshold. At the same time, the configuration information of the distributed control system must be modified accordingly after the height of the rod-type liquid level gauge is adjusted.

[0005] In a first aspect, the present invention provides an installation device for a rod-type liquid level gauge in a nuclear power plant, comprising: A measuring support has an installation station at one end, and a rod-type level gauge is adapted to extend along the measuring support and be fixedly installed at the installation station; A measurement mounting assembly is fixedly connected to the measurement support member. The measurement mounting assembly is provided with a mounting part that extends along the length direction of the measurement support member. The mounting part is adapted to be fixedly installed on a nuclear power plant building by means of an external locking member.

[0006] During installation of the rod-type level gauge installation device for nuclear power plants, the rod-type level gauge is first installed on the installation position of the measuring support. Then, the mounting part of the measuring installation assembly is initially fixed to the nuclear power plant building using external locking devices. When the level gauge height needs to be adjusted, the external locking devices are loosened, allowing the entire device to move relative to the nuclear power plant building along the mounting part. Since the mounting part extends along the length of the measuring support, this movement translates into continuous vertical position adjustment of the device. After adjusting to the target height, the external locking devices are retightened to complete the fixation. By setting the mounting part to extend along the length of the measuring support, the height position of the rod-type level gauge can still be continuously adjusted after installation. This effectively compensates for on-site installation errors or adapts to changes in measurement requirements, thus avoiding the need to re-drill holes in the building structure for height adjustments. Furthermore, fine-tuning the height can compensate for installation errors, thereby reducing the need for configuration modifications to the distributed control system due to changes in the instrument's range, and improving the efficiency and flexibility of rod-type level gauge installation and commissioning.

[0007] In one optional embodiment, the measuring support is a measuring cylinder, the inner diameter of which is not less than the outer diameter of the probe of the rod-type level gauge. During operation, the probe of the rod-type level gauge is housed inside the measuring cylinder. Since the inner diameter of the measuring cylinder is not less than the outer diameter of the probe, it provides interference-free installation and working space for the probe. This prevents external liquid environment fluctuations from impacting and damaging the probe of the rod-type level gauge, thereby protecting the probe component and providing a stable measurement environment for level measurement.

[0008] In one optional embodiment, at least two connecting holes are spaced apart on the side wall of the measuring support, and these connecting holes penetrate the side wall of the measuring support. Liquid can freely flow into and out of the measuring support through these at least two connecting holes. This ensures that the liquid level inside the measuring support quickly matches the liquid level in the external container or environment, effectively isolating the measuring area from direct impacts from violent fluctuations or splashes of the external liquid surface. This provides stable measuring conditions for the rod-type level gauge, improving the accuracy and reliability of the measurement.

[0009] In one optional embodiment, at least two sets of connecting holes are spaced apart along the length of the measuring support, with at least one set of connecting holes located close to the installation position and the remaining at least one set located away from the installation position. By providing connecting holes in the upper and lower parts of the measuring cylinder, sufficient exchange of liquid inside and outside the measuring cylinder is promoted, which can further suppress local turbulence of the external liquid to be measured and help to remove air bubbles that may be trapped inside the measuring cylinder, ensuring the accuracy of the liquid level height detected by the rod-type level gauge.

[0010] In one optional embodiment, the measurement mounting assembly includes a connector and a fixing member, the fixing member being fixedly connected to the measurement support member via the connector, and the mounting portion being disposed on the fixing member.

[0011] The measurement mounting assembly is designed as a combination of connectors and fasteners. The connectors are used to transfer loads, and the fasteners are used to provide the mounting interface. The combined design of the connectors and fasteners enhances the structural strength and stability of the measurement mounting assembly, ensuring reliable fixation of the measurement support in the complex environment of a nuclear power plant.

[0012] In one optional embodiment, the fastener is a mounting plate, the mounting portion is a through hole provided through the mounting plate, the through hole is an elongated hole, and the length direction of the through hole is arranged along the length of the measuring support.

[0013] When the height of the rod level gauge needs to be adjusted, the external locking piece through the elongated hole in the mounting plate is loosened. The mounting plate can then drive the entire mounting device to slide continuously along the length of the elongated hole, i.e., the length of the measuring support, thereby changing the height position of the rod level gauge. Fine-tuning the height position of the rod level gauge can compensate for installation errors, thereby reducing the need for configuration modifications to the distributed control system due to changes in the instrument's range, and improving the efficiency and flexibility of rod level gauge installation and commissioning.

[0014] In one optional embodiment, multiple connecting holes are spaced apart on the mounting plate, and the multiple connecting holes are arranged in parallel or collinear order. The mounting plate is simultaneously fixed to the nuclear power plant building through multiple connecting holes, enhancing the connection strength between the mounting plate and the building, preventing loosening or rotation of the mounting device when subjected to vibration or external forces, and ensuring the stability of the rod-type level gauge under complex operating conditions.

[0015] In one optional embodiment, the external locking element is an expansion bolt, which passes through a connecting hole in the mounting plate and is fixedly connected to the nuclear power plant building. The expansion bolt ensures the stability of the mounting plate's fixed installation on the nuclear power plant building, and ensures the positional stability of the rod-type level gauge installation device during long-term operation of the nuclear power plant.

[0016] In one optional embodiment, the connector is perpendicular to the measuring support and also perpendicular to the mounting plate. The connector and measuring support are perpendicular to each other, and the connector and mounting plate are also perpendicular, thus forming a right-angled structural frame between the measuring support, connector, and mounting plate. This ensures that when the height of the mounting plate is changed, the measuring support can synchronously change the height of the rod-type level gauge, guaranteeing the accuracy of the rod-type level gauge's height adjustment.

[0017] In one optional embodiment, the installation station is a flange mounting plate, and the rod level gauge is adapted to be fixedly connected to the installation station by bolt locking devices. The rod level gauge connects to the flange mounting plate, which serves as the installation station, via its own flange and is secured using bolt locking devices. This ensures a firm and stable connection between the rod level gauge and the installation device while facilitating subsequent maintenance and disassembly of the rod level gauge. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the working state of the rod-type liquid level gauge installation device for nuclear power plants provided in an embodiment of the present invention.

[0020] Figure 2 This is a side view of the rod-type liquid level gauge installation device for nuclear power plants provided in an embodiment of the present invention.

[0021] Figure 3 This is a top view of the rod-type liquid level gauge installation device for nuclear power plants provided in an embodiment of the present invention.

[0022] Figure 4 This is a structural schematic diagram of the fastener provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached drawings: 1. Measuring support; 2. Installation station; 3. Installation part; 4. Connecting part; 5. Fixing part; 6. Rod-type level gauge; 7. Connecting hole. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] The following is combined Figures 1 to 4 The following describes embodiments of the present invention.

[0026] According to an embodiment of the present invention, in one aspect, a mounting device for a rod-type liquid level gauge 6 in a nuclear power plant is provided, including a measuring support 1 for mounting the rod-type liquid level gauge 6 and a measuring mounting component for adjusting the mounting position of the rod-type liquid level gauge 6 in the height direction.

[0027] The measuring support 1 has an installation station 2 at one end, and the rod level gauge 6 is adapted to extend along the measuring support 1 and be fixedly installed on the installation station 2. The measuring installation assembly is fixedly connected to the measuring support 1, and the measuring installation assembly is provided with an installation part 3, which extends along the length of the measuring support 1. The installation part 3 is adapted to be fixedly installed on the nuclear power plant building by an external locking member.

[0028] During installation, the rod-type level gauge 6 is first installed on the installation position 2 of the measuring support 1. Then, the mounting part 3 on the measuring installation assembly is initially fixed to the nuclear power plant building using external locking devices. When the level gauge height needs adjustment, the external locking devices are loosened, allowing the entire device to move relative to the nuclear power plant building along the mounting part 3. Since the mounting part 3 extends along the length of the measuring support 1, this movement is converted into continuous vertical position adjustment of the device. After adjusting to the target height, the external locking devices are retightened to complete the fixation. By setting the mounting part 3, which extends along the length of the measuring support 1, the height of the rod-type level gauge 6 can still be continuously adjusted after installation. This effectively compensates for on-site installation errors or adapts to changes in measurement requirements, thus avoiding the need to re-drill holes in the building structure for height adjustment. Furthermore, fine-tuning the height can compensate for installation errors, thereby reducing the need for configuration modifications to the distributed control system due to changes in the instrument's range, and improving the efficiency and flexibility of the rod-type level gauge 6 installation and commissioning.

[0029] In this embodiment, the measuring support is a measuring cylinder, and the inner diameter of the measuring support is not less than the outer diameter of the probe of the rod-type level gauge 6. During operation, the probe of the rod-type level gauge 6 is housed inside the measuring cylinder. Because the inner diameter of the measuring cylinder is not less than the outer diameter of the probe of the rod-type level gauge 6, it provides interference-free installation and working space for the probe. This avoids external liquid environment fluctuations from impacting and damaging the probe of the rod-type level gauge 6, thereby protecting the probe component of the rod-type level gauge 6 and providing a stable measuring environment for level measurement.

[0030] The cross-sectional shape of the measuring cylinder is not limited to a circle; it can also be elliptical, polygonal, or other geometric shapes. In some other embodiments, the measuring support can also be a frame structure assembled from rods, with the rod-type level gauge 6 fixed to the frame structure.

[0031] In this embodiment, to ensure dynamic balance and pressure continuity of the liquid levels inside and outside the measuring cylinder, at least two connecting holes 7 are spaced apart on the side wall of the measuring cylinder, which serves as the measuring support. These connecting holes 7 penetrate the side wall of the measuring support. Liquid can freely flow into and out of the measuring support through these spaced-apart connecting holes 7. This ensures that the liquid level inside the measuring support quickly matches the liquid level in the external container or environment, effectively isolating the measuring area from direct impacts of violent fluctuations or splashes from the external liquid surface. This provides stable measuring conditions for the rod-type level gauge 6, improving the accuracy and reliability of the measurement.

[0032] Furthermore, at least two sets of connecting holes 7 are spaced apart along the length of the measuring support 1, with at least one set of connecting holes 7 arranged close to the installation position 2 and the remaining at least one set of connecting holes 7 arranged away from the installation position 2. By opening connecting holes 7 in the upper and lower parts of the measuring cylinder, sufficient exchange of liquid inside and outside the measuring cylinder is promoted, which can further suppress local turbulence of the external liquid to be measured and help to remove air bubbles that may be trapped inside the measuring cylinder, ensuring the accuracy of the liquid level height detected by the rod-type level gauge 6.

[0033] Specifically, two sets of connecting holes 7 are spaced apart along the length of the measuring support 1. One set of connecting holes 7 is arranged close to the installation position 2, and the other set of connecting holes 7 is arranged away from the installation position 2. Each set of connecting holes 7 includes multiple connecting holes 7 spaced apart along the circumference of the measuring support 1.

[0034] In one embodiment, the measurement mounting assembly includes a connector 4 and a fixing member 5. The fixing member 5 is fixedly connected to the measurement support member 1 via the connector 4, and the mounting part 3 is disposed on the fixing member 5.

[0035] The measurement installation assembly is configured as a mating structure of connector 4 and fastener 5. Connector 4 is used to transfer load, and fastener 5 is used to provide the installation interface. Through the combined design of connector 4 and fastener 5, the structural strength and stability of the measurement installation assembly are enhanced, ensuring the reliable fixation of measurement support 1 in the complex environment of nuclear power plants.

[0036] Specifically, the fixing member 5 is a mounting plate, and the mounting part 3 is a through hole 7 that penetrates the mounting plate. The through hole 7 is an elongated hole, and its length is arranged along the length of the measuring support member 1. The connecting member 4 is a connecting rod, one end of which is welded to the mounting plate and the other end of which is welded to the measuring support member 1.

[0037] When the height of the rod level gauge 6 needs to be adjusted, the external locking piece through the elongated hole in the mounting plate is loosened. The mounting plate can then drive the entire mounting device to slide continuously along the length of the elongated hole, i.e., the length of the measuring support 1, thereby changing the height position of the rod level gauge 6. Fine-tuning the height position of the rod level gauge 6 can compensate for installation errors, thereby reducing the need for configuration modifications to the distributed control system due to changes in the instrument's range, and improving the efficiency and flexibility of the installation and commissioning of the rod level gauge 6.

[0038] Furthermore, multiple connecting holes 7 are spaced apart on the mounting plate, and these connecting holes 7 are arranged in parallel or collinear order. The mounting plate is simultaneously fixed to the nuclear power plant building via these multiple connecting holes 7, enhancing the connection strength between the mounting plate and the building. This prevents the mounting device from loosening or rotating under vibration or external forces, ensuring the stability of the rod-type level gauge 6 under complex operating conditions.

[0039] In one embodiment, the external locking element is an expansion bolt, which passes through the connecting hole 7 on the mounting plate and is fixedly connected to the nuclear power plant building. The expansion bolt ensures the stability of the mounting plate's fixed installation on the nuclear power plant building, and ensures the positional stability of the rod-type level gauge 6 installation device during long-term operation of the nuclear power plant.

[0040] In one embodiment, the connector 4 is perpendicular to the measuring support 1 and is also perpendicular to the mounting plate. The connector 4 is perpendicular to the measuring support 1 and also perpendicular to the mounting plate, thus forming a right-angled structural frame between the measuring support 1, the connector 4, and the mounting plate. This ensures that when the height of the mounting plate is changed, the measuring support 1 can synchronously change the height of the rod-type level gauge 6, guaranteeing the accuracy of the height adjustment of the rod-type level gauge 6.

[0041] In one embodiment, installation station 2 is a flange mounting plate, and the rod level gauge 6 is adapted to be fixedly connected to installation station 2 by bolt locking devices. The rod level gauge 6 connects to the flange mounting plate of installation station 2 via its own flange and is fixedly connected by bolt locking devices. This ensures a firm and stable connection between the rod level gauge 6 and the installation device, while facilitating subsequent maintenance and disassembly of the rod level gauge 6.

[0042] The rod-type level gauge 6 installation device provided in this application is used for the installation of rod-type instruments in nuclear power plants. It includes a measuring cylinder as a measuring support 1, a flange mounting plate as an installation station 2, and a measuring installation assembly. The measuring installation assembly has a mounting plate with elongated holes. The mounting plate is fixed to the wall of the nuclear power plant building by expansion bolts and can withstand the seismic load of a baseline accident. During production, the length of the measuring cylinder can be adjusted according to the length of the instrument probe. Connecting holes 7 are opened at the top and bottom of the measuring cylinder. The instrument is fixed to the measuring cylinder using a flange mounting plate made of steel plate, which is welded to the measuring cylinder. The mounting plate has four expansion bolt mounting holes 7, allowing the instrument height to be adjusted up and down within an adjustable range after on-site installation without modifying the bolt positions.

[0043] As the core of the rod-type level gauge installation device in nuclear power plants, the measuring cylinder directly contacts the liquid being measured. During operation, it effectively isolates external liquid splashes and level disturbances, ensuring the accuracy of level measurement. The measuring cylinder is made of stainless steel and is designed and manufactured strictly according to nuclear power plant standards. It needs to have good stability and corrosion resistance to adapt to the complex chemical and physical environment of nuclear power plants, providing stable conditions for level measurement. High-quality stainless steel materials conforming to nuclear power plant standards are selected during production to ensure that the measuring cylinder's corrosion resistance, stability, and anti-interference capabilities meet requirements. Specifications are customized according to the level measurement range and accuracy requirements, and the cylinder wall thickness must ensure the strength of the measuring cylinder to operate normally under different pressures. During manufacturing, the stainless steel sheet is first rolled to form the cylinder body. Automated welding processes are used to complete longitudinal and circumferential welding, ensuring strong and uniform welds free of defects such as porosity and cracks. After welding, overall heat treatment is performed to eliminate stress and improve material properties. Subsequent machining, including the flange interface and measuring hole processing, ensures dimensional accuracy and surface quality. Finally, non-destructive testing, such as ultrasonic testing and magnetic particle testing, is performed to ensure that the measuring cylinder is free of internal defects.

[0044] The flange mounting plate serves to connect and secure the measuring cylinder in the rod-type level gauge 6 installation device in nuclear power plants. It is tightly welded to the measuring cylinder, providing stable support for the rod-type level gauge 6 and ensuring its stable fixation. The flange mounting plate must be able to withstand the weight of the measuring cylinder and external forces under different operating conditions, ensuring the level gauge remains stable during operation, preventing shaking or displacement, and thus guaranteeing the accuracy of the measurement results. During production, the flange mounting plate is made of high-strength alloy steel, formed through a forging process to ensure mechanical properties and rigidity. The surface undergoes anti-corrosion treatment, such as hot-dip galvanizing or spraying an anti-corrosion coating, to adapt to the nuclear power plant environment and prevent rust and corrosion. Its dimensions and shape match the flange interface of the measuring cylinder, ensuring a tight connection. During manufacturing, the forged high-strength alloy steel billet is machined, including processes such as milling, drilling, and tapping, to form the structure required for connection with the measuring cylinder and wall-mounted fixing plate. Strict control of dimensional accuracy and geometric tolerances is maintained during machining to ensure the fitting accuracy of the mounting plate with other components. After machining, surface anti-corrosion treatment is performed.

[0045] The mounting plate, fixed to a wall or other supporting structure, provides a stable foundation for the installation of the rod-type level gauge 6 in the nuclear power plant. The connecting hole 7 on the mounting plate is an oblong hole, the length of which matches the height adjustment range of the mounting device, enabling continuous adjustment of the device's height. The mounting plate is made of stainless steel sheet, processed through cutting, stamping, and drilling. Stainless steel is environmentally friendly, durable, and easy to install and adjust. The fixing holes are machined using high-precision CNC machine tools to ensure that the dimensional accuracy and surface roughness of the rectangular holes meet design requirements. During processing, the stainless steel sheet is cut into the required shape using a laser cutting machine according to the design dimensions. Rectangular fixing holes are machined using a stamping process to ensure that the size and shape of the holes meet design requirements. Chamfering is applied around the fixing holes to prevent scratching bolts or other components during adjustment.

[0046] When the instrument height needs adjustment, the operator simply loosens the fixing bolts, allowing the mounting plate to move freely within the rectangular fixing holes. Depending on the actual needs, the operator can smoothly move the bracket along the direction of the fixing holes to adjust to the required height. After adjustment, tighten the fixing bolts to secure the mounting plate in the new position. This allows for quick height adjustment without affecting the operation of other components, improving the operability and adaptability of the nuclear power plant's liquid level measurement system, reducing the risk of measurement inaccuracies due to installation errors or changes in operating conditions, and ensuring the safe and stable operation of the nuclear power plant.

[0047] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. An installation device for a rod-type liquid level gauge in a nuclear power plant, characterized in that, include: A measuring support (1) is provided with an installation station (2) at one end, and a rod-type liquid level gauge (6) is adapted to extend along the measuring support (1) and be fixedly installed on the installation station (2); A measurement installation assembly is fixedly connected to the measurement support (1). The measurement installation assembly is provided with an installation part (3), which extends along the length direction of the measurement support (1). The installation part (3) is adapted to be fixedly installed on the nuclear power plant building by an external locking member.

2. The installation device for a rod-type liquid level gauge in a nuclear power plant according to claim 1, characterized in that, The measuring support is a measuring cylinder, and the inner diameter of the measuring support is not less than the outer diameter of the probe of the rod level gauge (6).

3. The installation device for a rod-type liquid level gauge in a nuclear power plant according to claim 2, characterized in that, The measuring support has at least two connecting holes (7) spaced apart on its side wall, and the connecting holes (7) penetrate the side wall of the measuring support.

4. The installation device for a rod-type liquid level gauge in a nuclear power plant according to claim 3, characterized in that, The connecting holes (7) are arranged in at least two sets along the length direction of the measuring support (1), wherein at least one set of the connecting holes (7) is arranged close to the installation station (2), and the remaining at least one set of the connecting holes (7) is arranged away from the installation station (2).

5. The installation device for a rod-type liquid level gauge in a nuclear power plant according to any one of claims 1 to 4, characterized in that, The measurement installation assembly includes a connector (4) and a fixing member (5). The fixing member (5) is fixedly connected to the measurement support member (1) through the connector (4). The mounting part (3) is provided on the fixing member (5).

6. The installation device for a rod-type liquid level gauge in a nuclear power plant according to claim 5, characterized in that, The fixing member (5) is a mounting plate, and the mounting part (3) is a connecting hole (7) that passes through the mounting plate. The connecting hole (7) is an elongated hole, and the length direction of the connecting hole (7) is arranged along the length of the measuring support member (1).

7. The installation device for a rod-type liquid level gauge in a nuclear power plant according to claim 6, characterized in that, Multiple connecting holes (7) are spaced apart on the mounting plate, and the multiple connecting holes (7) are arranged in parallel or collinear order.

8. The installation device for a rod-type liquid level gauge in a nuclear power plant according to claim 6, characterized in that, The external locking component is an expansion bolt, which is fixedly connected to the nuclear power plant building after passing through the connecting hole (7) on the mounting plate.

9. The installation device for a rod-type liquid level gauge in a nuclear power plant according to claim 5, characterized in that, The connector (4) is perpendicular to the measuring support (1), and the connector (4) is perpendicular to the fixing member (5).

10. The installation device for a rod-type liquid level gauge in a nuclear power plant according to any one of claims 1 to 4, characterized in that, The installation station (2) is a flange mounting plate, and the rod level gauge (6) is adapted to be fixedly connected to the installation station (2) by bolt locking components.

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