Nuclear Furnace Vibration Measurement Device

Abstract

A reactor vibration measuring device is provided that can measure the vibration of a nuclear reactor while a sensor for measuring the vibration of the nuclear reactor is fixed to the head of the nuclear reactor using a stud fastening means. [Solution] A reactor vibration measuring device for measuring vibrations of a reactor having a head and a body connected by stud fastening means includes an acceleration sensor that is in close contact with the head and supported by a bracket, a fixed part that is fixed between the plurality of stud fastening means that connect the head and the body on the head side, a rotating part that is rotatably connected to the upper part of the fixed part, and a bracket support part that is connected to one side of the rotating part and moves up and down on one side of the rotating part to support the bracket that supports the acceleration sensor.

Description

[Technical Field]

[0001] The present invention relates to a nuclear reactor vibration measuring device, and more particularly to a nuclear reactor vibration measuring device that measures the vibration of a nuclear reactor in which a head and a body are connected by a stud fastening means. [Background technology]

[0002] Reactor vessel internals (RVIs) are exposed to vibrations caused by the flow of reactor coolant under steady and transient operating conditions of the reactor vessel. Therefore, it is necessary to demonstrate for an actual reactor that their integrity is maintained and safety margins are ensured throughout the entire lifespan of the nuclear power plant. For this purpose, a Comprehensive Vibration Assessment Program (CVAP) is conducted for reactor internals.

[0003] The comprehensive vibration assessment of the reactor internals consists of analysis, measurement, and inspection. Measurements are carried out during the reactor hot functional test (HFT) of the reactor before nuclear fuel is loaded during commissioning tests. The measurements are used to confirm the vibration predictions calculated from the analysis during steady-state and transient operating conditions of the reactor, and to determine the safety margin for operation over the entire 60-year lifespan.

[0004] When designing and manufacturing vibration measurement equipment and measurement structures for comprehensive vibration evaluation of reactor internal structures, the measurement locations and measurement items must be carefully selected in advance.Comprehensive vibration evaluation of reactor internal structures requires comparing and evaluating vibration analysis results and measurement results, so the measurement locations and measurement items must be selected based on the analysis results.

[0005] Conventionally, for comprehensive vibration evaluation of the reactor internal structure, vibration measurement sensors are attached to the reactor internal structure and connected by measurement cables from a pressure boundary penetration located in the upper head of the reactor to a data acquisition system.

[0006] However, due to the complex structure inside the reactor, installing the vibration measurement sensor and connecting the measurement cable required modifying the structure of the reactor internal structure, and additional measurement structures had to be designed, manufactured, and installed in order to install the sensors inside the reactor internal structure, which then had to be removed after the measurement, posing numerous problems. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Korean Patent No. 10-1250334 (registered on March 28, 2013) Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made to solve the above problems, and has as its object to provide a reactor vibration measuring device that can measure reactor vibrations while the sensor for measuring the reactor vibrations is fixed using stud fastening means provided on the reactor head. [Means for solving the problem]

[0009] In order to achieve the above object, the present invention provides a reactor vibration measuring device for measuring vibrations of a reactor having a head and a body connected by stud fastening means, the device including: an acceleration sensor that is in close contact with the head and supported by a bracket; a fixing part that is fixed between the plurality of stud fastening means that connect the head and the body on the head side; a rotating part that is rotatably connected to an upper part of the fixing part; and a bracket support part that is connected to one side of the rotating part and moves up and down on one side of the rotating part to support the bracket that supports the acceleration sensor.

[0010] The reactor vibration measuring device according to the present invention may further include a position fixing unit connected to the other side of the rotating unit, which moves up and down on the other side of the rotating unit, one end of which is in close contact with the head to support the other side of the rotating unit, and which fixes the position of the rotating unit.

[0011] In the reactor vibration measuring device according to the present invention, the fixed part may include a fixed end that is fitted between and fixed to adjacent stud fastening means, and a fastening end that is formed integrally with the fixed end, protrudes from an upper part of the fixed end, and to which the pivot part is rotatably fastened, and a mounting hole into which a pivot pin is attached may be formed in the fastening end.

[0012] The pivoting part may include a mounting body rotatably mounted on the fastening end, and a first connecting body and a second connecting body formed corresponding to both ends of the mounting body and connecting the bracket support part and the position fixing part, and the first connecting body and the second connecting body may be formed with a first connecting hole and a second connecting hole, respectively, connecting the bracket support part and the position fixing part.

[0013] A coupling end may be protruded from a lower portion of the mounting body and rotatably coupled to the fastening end, and a mounting hole into which the pivot pin is mounted may be formed in the coupling end.

[0014] The mounting body may have a rod shape, the first connecting body and the second connecting body may protrude outward from both ends of the mounting body, and the rotating portion may have an "I"-shaped cross section.

[0015] The bracket support may include a support body that supports the bracket, a support body fastening bolt having one end passing through the first connection hole and fastened to the support body and rising and falling on one side of the pivoting part, and a first bolt installed spaced apart from the pivoting part to correspond to the support body fastening bolt.

[0016] A coupling hole to which the support body fastening bolt is coupled may be formed on an upper surface of the support body, and a mounting groove to which the bracket is mounted may be formed on a lower surface of the support body.

[0017] The position fixing part may include an elevation bolt having one end passing through the second connection hole and closely contacting the head and elevating and lowering on the other side of the pivot part, and a second bolt mounted spaced apart from the elevation bolt to correspond to the elevation bolt and centered on the pivot part. [Effects of the Invention]

[0018] According to the reactor vibration measuring device of the present invention, the acceleration sensor for measuring vibration is not attached to the internal structure of the reactor, but is fixed to the head of the reactor using a stud fastening means, a fixed part, and a rotating part that connect the head and body of the reactor, and it is possible to measure the vibration of the reactor.

[0019] In addition, since the bracket supporting the acceleration sensor is not fixed to the reactor head using welding, magnets, or adhesives, the bracket can be easily separated from the head after measuring the reactor vibrations, and since no welding or other methods are used, damage to the head can be prevented. [Brief explanation of the drawings]

[0020] [Figure 1]1 is a plan view showing a state in which a reactor vibration measuring device according to an embodiment of the present invention is fixed by a stud fastening means that connects a head and a body of a reactor. [Figure 2] FIG. 2 is an enlarged perspective view of part "A" in FIG. [Figure 3] 3 is an enlarged view of a fixed portion, a rotating portion, a bracket support portion, and a position fixing portion shown in FIG. 2. FIG. [Figure 4] 4 is a diagram illustrating a process of fixing a bracket attached to a head of a nuclear reactor using a fixing part, a rotating part, a bracket support part, and a position fixing part shown in FIG. 3. [Figure 5] 4 is a diagram illustrating a process of fixing a bracket attached to a head of a nuclear reactor using a fixing part, a rotating part, a bracket support part, and a position fixing part shown in FIG. 3. [Figure 6] FIG. 10 is a diagram showing a modified example of the reactor vibration measuring device according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms and phrases used in the specification and claims should not be interpreted as being limited to their ordinary or dictionary meanings, but should be interpreted as having meanings and concepts that correspond to the technical ideas of the present invention, in accordance with the principle that the inventor can appropriately define the concepts of terms in order to best describe his / her invention.

[0022] 1 to 3, a reactor vibration measuring device 100 according to an embodiment of the present invention is for measuring vibrations of a reactor 1 in which a head 10 and a body 20 are connected by a stud fastening means 30, and includes an acceleration sensor 110, a fixed part 120, a rotating part 130, and a bracket support part 140, and may further include a position fixing part 150.

[0023] The nuclear fuel used as fuel for the nuclear reactor 1 must be replaced at regular intervals. When replacing the nuclear fuel, the stud fastening means 30 is separated, the head 10 covering the body 20 is removed, and then the nuclear fuel inside the body 20 is replaced. The stud fastening means 30 must be provided in the nuclear reactor 1 in order to connect the head 10 and the body 20.

[0024] An acceleration sensor 110 for measuring vibration is closely attached to the head 10, and the acceleration sensor 110 is supported by a bracket B. The acceleration sensor 110 is located within the bracket B, which serves to support the acceleration sensor 110 and protect the acceleration sensor 110 from external impact.

[0025] The head 10 is provided with a fixing portion 120, which is disposed between a plurality of stud fastening means 30 that connect the head 10 and the body 20, and is fixed by being fitted with the adjacent stud fastening means 30.

[0026] 2 to 5, the fixing portion 120 includes a fixing end 121 and a fastening end 122. The fixing end 121 is a thin, rectangular plate that is fitted between the stud fastening means 30 disposed adjacent to the head 10, and it is preferable that a fitting groove (not shown) into which the fixing end 121 fits is formed on the outer periphery of the stud fastening means 30. The fixing end 121 is fixed between the stud fastening means 30 by being inserted into the fitting groove (not shown).

[0027] A fastening end 122 protrudes from the upper portion of the fixed end 121, and the fastening end 122 is integrally formed with the fixed end 121, and the rotating part 130 is rotatably fastened to the fastening end 122.

[0028] The fastening end 122 is formed with a mounting hole 122a into which a pivot pin P for rotatably fastening the pivoting part 130 is inserted, and the fastening end 122 protrudes from the upper part of the fixed end 121 in a triangular shape, and it is preferable that the fastening end 122 is formed with an insertion groove 122b in the width direction of the fastening end 122 into which the lower part of the pivoting part 130 is inserted.

[0029] Although it has been described that the fastening end 122 having the insertion groove 122b formed on the upper part of the fixed end 121 is formed integrally with the fixed end 121, this is not limited thereto, and the fastening end 122 may include a first fastening end (not shown) having an attachment hole formed therein and a second fastening end (not shown), and the first fastening end (not shown) and the second fastening end (not shown) may be disposed spaced apart on the upper part of the fixed end 121 and then attached by welding.

[0030] A rotating part 130 is rotatably coupled to an upper part of the fixed part 120 using the rotating pin P, and the rotating part 130 includes a mounting body 131, a first connecting body 132, and a second connecting body 133.

[0031] The mounting body 131 is rotatably mounted to the fastening end 122 by the pivot pin P, and a triangular coupling end 131a protrudes from the lower part of the mounting body 131 to be rotatably coupled to the fastening end 122, and a mounting hole 131b is formed in the coupling end 131a to receive the pivot pin P. The coupling end 131a is preferably inserted into an insertion groove 122b formed in the fastening end 122 or inserted between a first coupling end (not shown) and a second coupling end (not shown) spaced apart from each other.

[0032] A first connecting body 132 and a second connecting body 133 are formed at both ends of the mounting body 131, and a bracket support part 140 and a position fixing part 150 are connected to the first connecting body 132 and the second connecting body 133, respectively.

[0033] The mounting body 131 has a rod shape, the first connecting body 132 and the second connecting body 133 protrude outward from both ends of the mounting body 131, and the rotating part 130 preferably has an "I" shaped cross section.

[0034] The first connecting body 132 and the second connecting body 133, which are formed corresponding to both ends of the mounting body 131, are integrally formed with the mounting body 131, and it is preferable that the first connecting body 132 and the second connecting body 133 are formed with a first connecting hole 132a and a second connecting hole 133a, respectively.

[0035] The bracket support part 140 is inserted into and connected to the first connection hole 132a, and the position fixing part 150 is inserted into and connected to the second connection hole 133a. The bracket support part 140 is connected to one side of the rotating part 130 through the first connection hole 132a and moves up and down on one side of the rotating part 130 to support the bracket B that supports the acceleration sensor 110.

[0036] The bracket support part 140 includes a support body 141 , a support body fastening bolt 142 , and a first bolt 143 , and the support body 141 serves to support the bracket B that supports the acceleration sensor 110 .

[0037] The support body 141 is fastened to one end of a support body fastening bolt 142 passing through a first connecting hole 132a formed in the first connecting body 132, and the support body fastening bolt 142 moves up and down through the first connecting hole 132a formed on one side of the rotating part 130.

[0038] It is preferable that a first bolt 143 is attached to the support body fastening bolt 142 at a distance corresponding to the center of the rotating part 130, and as the support body fastening bolt 142 rotates forward or backward, the support body 141 rises and falls in the first connecting body 132, and the first bolt 143 serves to prevent the support body fastening bolt 142 from coming off the first connecting hole 132a.

[0039] It is preferable that a connection hole 141a is formed on the upper surface of the support body 141 to which one end of the support body fastening bolt 142 passing through the first connection hole 132a is connected, and a mounting groove 141b is formed on the lower surface of the support body 141 to which the bracket B is attached.

[0040] The position fixing part 150 is inserted into and connected to the second connecting hole 133a formed in the second connecting body 133, and the position fixing part 150 moves up and down on the other side of the rotating part 130, and one end of the position fixing part 150 is in close contact with the head 10 to support the other side of the rotating part 130 and fix the position of the rotating part 130.

[0041] The position fixing part 150, which is inserted into the second connecting hole 133a and connected to the other side of the rotating part 130, includes a lifting bolt 151 and a second bolt 152. One end of the lifting bolt 151 passes through the second connecting hole 133a and is in close contact with the head 10, and the lifting bolt 151 moves up and down on the other side of the rotating part 130 as it rotates forward or backward.

[0042] A second bolt 152 is attached to the lifting bolt 151 at a distance from the pivot part 130, and the second bolt 152 serves to prevent the lifting bolt 151 from coming off the second connecting hole 133a.

[0043] 4 and 5, when the bracket B supporting the acceleration sensor 110 closely attached to the head 10 is supported using the bracket support part 140 connected to one side of the pivot part 130, the pivot part 130 rotates around the pivot pin P so that one side of the fixing part 120 fixed between the stud fastening means 30 rises and the other side falls.

[0044] When the position fixing part 150 is connected to the other side of the rotating part 130 and the lifting bolt 151 of the position fixing part 150 is rotated to lower the lifting bolt 151 toward the head 10, and one end of the lifting bolt 151 is kept in close contact with the head 10 while continuing to rotate, the other side of the rotating part 130 gradually rises and one side gradually descends, and one side of the rotating part 130 firmly supports the bracket B from top to bottom.

[0045] 1 and 6, the bracket support part 140 can be connected to one side and the other side of the rotating part 130, and the bracket support part 140 is connected to both sides of the rotating part 130, so that the acceleration sensor 110, which is arranged at a corresponding position around the fixing part 120, can be supported using the bracket B and fixed to the upper part of the head 10.

[0046] The acceleration sensor 110 for measuring the vibration of the reactor 1 is not attached to the internal structure of the reactor 1, but is fixed to the head 10 of the reactor 1 using a stud fastening means 30, a fixed part 120, and a rotating part 130 that connect the head 10 and the body 20, and the vibration of the reactor 1 can be measured.

[0047] Furthermore, since the bracket B supporting the acceleration sensor 110 is not fixed to the head 10 of the reactor 1 using welding, magnets, or adhesives, the bracket B can be easily separated from the head 10 after measuring the vibration of the reactor 1, and since no method such as welding is used, damage to the head 10 can be prevented.

[0048] Although the present invention has been described with reference to the embodiments shown in the drawings, these are merely examples, and those skilled in the art will recognize that various modifications and equivalent embodiments are possible. Therefore, the true technical scope of protection of the present invention should be determined by the technical spirit of the appended claims. [Explanation of symbols]

[0049] 1: Reactor, 10: Head 20: Body, 30: Stud fastening means 100: Nuclear reactor vibration measuring device, 110: Acceleration sensor 120: fixed part, 130: rotating part 140: bracket support part, 150: position fixing part

Claims

1. A nuclear reactor vibration measuring device for measuring vibrations of a nuclear reactor in which a head and a body are connected by a stud fastening means, an acceleration sensor that is in close contact with the head and supported by a bracket; a fixing portion fixed between the plurality of stud fastening means that connect the head and the body on the head side; a rotating part rotatably coupled to an upper part of the fixed part; a bracket support connected to one side of the pivoting part and moving up and down on the one side of the pivoting part to support the bracket that supports the acceleration sensor.

2. 2. The reactor vibration measuring device according to claim 1, further comprising a position fixing unit connected to the other side of the rotating unit, which moves up and down on the other side of the rotating unit, one end of which is in close contact with the head to support the other side of the rotating unit, and which fixes the position of the rotating unit.

3. The fixing portion is a fixed end that is fitted between adjacent stud fastening means and fixed thereto; a fastening end formed integrally with the fixed end, protruding from an upper portion of the fixed end, and to which the rotating part is rotatably fastened, The reactor vibration measuring device according to claim 2 , wherein the fastening end is formed with a mounting hole into which a pivot pin is mounted.

4. The rotating portion is a mounting body rotatably mounted on the fastening end; a first connecting body and a second connecting body formed corresponding to both ends of the mounting body, the first connecting body being connected to the bracket support part and the second connecting body being connected to the position fixing part; The reactor vibration measuring device according to claim 3 , wherein the first and second connection bodies are formed with first and second connection holes, through which the bracket support part and the position fixing part are connected, respectively.

5. a coupling end protruding from a lower portion of the mounting body and rotatably coupled to the fastening end; The reactor vibration measuring device according to claim 4 , wherein the coupling end is formed with a mounting hole into which the pivot pin is mounted.

6. The mounting body has a rod shape, the first connecting body and the second connecting body protrude outward from both ends of the mounting body; The reactor vibration measuring device according to claim 4 , wherein the rotating portion has an “I” shaped cross section.

7. The bracket support portion is a support body that supports the bracket; a support body fastening bolt, one end of which passes through the first connecting hole and is fastened to the support body, and which moves up and down on one side of the pivot part; 7. The reactor vibration measuring device according to claim 4, further comprising: a first bolt attached around the rotation part so as to correspond to the support body fastening bolt and spaced apart from the rotation part.

8. A coupling hole to which the support body fastening bolt is coupled is formed on the upper surface of the support body, The reactor vibration measuring device according to claim 7 , wherein a mounting groove for mounting the bracket is formed on a lower surface of the support body.

9. The position fixing unit is an elevating bolt having one end passing through the second connecting hole and in close contact with the head, and elevating and lowering on the other side of the pivot part; 7. The reactor vibration measuring device according to claim 4, further comprising: a second bolt attached to the rotary portion at a distance from the rotary portion so as to correspond to the lifting bolt.

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