A device for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions

Abstract

The application relates to a device for measuring the performance of a metal sealing ring for spent fuel storage under high-temperature conditions, which comprises a test container, a double sealing ring, a heating assembly and a leak detection device; the test container comprises a container body, a cover and a partition plate; the cover is arranged on the container body and is connected in a sealing mode through the double sealing ring to form an accommodating space inside; the partition plate is arranged in the accommodating space and divides the accommodating space into a first space and a second space which are independent of each other; the first space is close to the cover; the heating assembly is arranged in the second space; and the leak detection device is communicated with the gap between the double sealing rings through the communication hole of the cover. The double sealing ring is directly installed on the test container, the heating assembly arranged in the second space is used to heat the first space and the double sealing ring, the actual use condition of the spent fuel storage container is more met, the leak is measured in real time through the leak detection device, the sealing performance of the double sealing ring under the working condition is obtained, and the measurement result is more accurate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pressure vessel sealing performance measurement, in particular to a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions. BACKGROUND

[0002] Spent fuel, also known as irradiated nuclear fuel, is nuclear fuel that has been subjected to radiation and used, usually generated by nuclear reactors of nuclear power plants. Spent fuel has a high heat release rate, so the container for storing spent fuel is in a high temperature environment for a long time. Long-term use in a high temperature environment can cause the performance of the container components to decline, especially the metal sealing ring as a sealing component. According to relevant national regulations and design requirements, the metal sealing ring needs to maintain good sealing performance when used in a long-term high temperature environment. Therefore, a corresponding test device is needed to measure the sealing performance of the metal sealing ring after long-term use. Existing test devices mostly need to be equipped with large heating equipment, such as a heating device that heats the metal sealing ring and then installs it on the container for air tightness testing. This method cannot well reflect the real scenario of the metal sealing ring in use, resulting in a deviation in the measured sealing performance. The above problems need to be solved. SUMMARY

[0003] The present application discloses a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions, aiming to solve the technical problems existing in the prior art.

[0004] The present application adopts the following technical solutions:

[0005] The present application provides a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions, which includes a test container, a double sealing ring, a heating assembly, and a leak detection device. The test container includes a container body, a cover, and a partition. The cover is placed on the container body and is sealed and connected by the double sealing ring to form an internal containing space. The partition is arranged in the containing space and separates the containing space into two independent spaces, the first space and the second space. The first space is close to the cover. The heating assembly is arranged in the second space. The leak detection device is connected to the gap between the double sealing rings through the communication hole of the cover.

[0006] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, the heating assembly comprises a heater, a first temperature measuring element, a second temperature measuring element and a heating controller; the heater is arranged in the second space; the first temperature measuring element is arranged in the first space and adjacent to the double sealing ring for measuring the temperature of the double sealing ring; the second temperature measuring element is arranged in the second space and adjacent to the heater for measuring the temperature of the heater; the heating controller is connected to the heater, the first temperature measuring element and the second temperature measuring element for controlling the heater according to the measured values of the first temperature measuring element and the second temperature measuring element.

[0007] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, a plurality of first temperature measuring elements and a plurality of second temperature measuring elements are arranged; the plurality of first temperature measuring elements are uniformly distributed along the inner side of the double sealing ring; and the plurality of second temperature measuring elements are uniformly distributed in the second space.

[0008] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, the leak detection device comprises a helium concentration sensor, a communication pipe and a helium mass spectrometer; the helium concentration sensor is used for measuring the helium concentration in the first space.

[0009] The communication pipe communicates the communication hole and the helium mass spectrometer.

[0010] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, a plurality of helium concentration sensors are arranged; and the plurality of helium concentration sensors are used for measuring the helium concentration in the middle and bottom of the first space.

[0011] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, an inflation port is arranged on the wall of the test container corresponding to the first space for connecting an external helium pressure device.

[0012] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, the communication pipe of the leak detection device is sealingly connected to the communication hole through a sealing connector; the sealing connector is made of a metal material with a greater thermal expansion coefficient than the cover body, and has a through channel arranged therein and comprising a head portion and an insertion portion; the head portion has a size greater than that of the communication hole, is arranged on the communication hole and is screw-connected to the cover body through bolts, and is sealingly connected to the communication hole through a sealing gasket; the insertion portion is connected to the head portion and located in the communication hole, and can abut against the inner wall of the communication hole after being heated; and one end of the through channel communicates with the communication pipe, and the other end is located in the communication hole.

[0013] The bolt rod of the bolt comprises a cylindrical part and a threaded part; the cylindrical part is close to the nut of the bolt, and is in clearance fit with the through hole of the head part;

[0014] The sealing gasket is made of a material capable of being deformed under pressure.

[0015] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, the sealing gasket is made of graphite material.

[0016] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, the insertion part is in the shape of a conical frustum structure gradually expanding from one side to the other side of the head part; the communication hole is in the conical hole of the insertion part, and the inner wall of the communication hole is in close contact with the surface of the insertion part.

[0017] In the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions, the double sealing ring comprises an inner sealing ring and an outer sealing ring; the inner sealing ring and the outer sealing ring have a gap therebetween, and are both in sealing connection with the container body and the cover body.

[0018] The technical scheme adopted by the present application can achieve the following beneficial effects:

[0019] The present application mainly provides a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions, which directly installs a double sealing ring on a test container, and heats the first space and the double sealing ring by a heating assembly arranged in the second space, which is more in line with the actual use of the spent fuel storage container, and uses a leak detection device to measure the leakage in real time to obtain the sealing performance of the double sealing ring under the working condition, so that the measurement result is more accurate, and the service life of the sealing ring is further determined. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description, which constitutes a part of the present application. The schematic embodiments of the present application and the description and explanation thereof do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 It is a structural schematic view of the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions of the present application;

[0022] Figure 2 It is a structural schematic view of the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions of the present application; Figure 1 It is a local enlarged structural schematic view of A of the device for measuring the performance of the metal sealing ring for spent fuel storage under high temperature conditions of the present application;

[0023] Figure 3A structure diagram of a sealing connector in a mounted state according to a preferred embodiment of the present application.

[0024] Explanation of reference numerals:

[0025] 1. Test container; 11. Container body; 12. Cover; 121. Communication hole; 13. Partition; 14. Containment space; 141. First space; 142. Second space; 15. Inflation port; 16. Exhaust port; 2. Double sealing ring; 21. Inner sealing ring; 22. Outer sealing ring; 3. Heating assembly; 31. Heater; 32. First temperature measuring element; 33. Second temperature measuring element; 34. Heating controller; 4. Leak detection device; 41. Helium concentration sensor; 42. Communication tube; 43. Helium mass spectrometer; 5. Sealing connector; 51. Head; 511. Threaded hole; 52. Insertion part; 53. Sealing washer; 54. Through passage; 6. Bolt; 61. Bolt shaft; 611. Cylindrical part; 612. Threaded part; 62. Nut. DETAILED DESCRIPTION

[0026] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described below in connection with specific embodiments of the present application and corresponding drawings. In the description of the present application, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the context clearly indicates otherwise.

[0027] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "linking" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be mechanical connection, can also be magnetic connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three or more, etc., unless otherwise explicitly specified and limited.

[0028] In the field of interventional medical instrument technology, the position close to the operator is generally defined as the proximal end, and the position away from the operator is defined as the distal end. The direction of the central axis of a column, a tube and the like is defined as the axial direction. The radial direction refers to the direction in the radial plane through the central axis, for example, the linear direction along the diameter or radius, or the linear direction perpendicular to the central axis.

[0029] Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0030] To solve the problems in the prior art, the embodiment of the present application provides a device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions.

[0031] As shown in the drawings, Figure 1 A device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions includes a test container 1, a double sealing ring 2, a heating assembly 3, and a leak detection device 4. The test container 1 includes a container body 11, a cover 12, and a partition 13. The cover 12 is covered on the container body 11 and is sealingly connected through the double sealing ring 2 to form an accommodating space 14 inside. The partition 13 is arranged in the accommodating space 14 and divides the accommodating space 14 into first and second spaces 141 and 142, which are independent of each other. The first space 141 is close to the cover 12. The heating assembly 3 is arranged in the second space 142. The leak detection device 4 communicates with the gap between the double sealing ring 2 through the communication hole 121 of the cover 12. Specifically, the double sealing ring 2 is a metal sealing ring. The leakage detection adopts the cladding vacuumization-gas detector method to quickly measure the leakage rate of the double sealing ring 2 by using the leak detection device 4. Specifically, the leakage detection can be performed according to the relevant contents of GB / T 17230-1998 “Leakage Test of Radioactive Material Safety Transport Package”.

[0032] The device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions of the present application directly installs the double sealing ring on the test container and heats the first space and the double sealing ring by the heating assembly arranged in the second space, which is more consistent with the real use of the spent fuel storage container. The leakage is measured in real time by the leak detection device to obtain the sealing performance of the double sealing ring under the working condition, and the measurement result is more accurate. Then, the service life of the sealing ring is judged, such as by continuously monitoring the change of the leakage rate.

[0033] In some preferred embodiments, the heating assembly 3 comprises a heater 31, a first temperature measuring element 32, a second temperature measuring element 33 and a heating controller 34; the heater 31 is arranged in the second space 142; the first temperature measuring element 32 is arranged in the first space 141 and adjacent to the double sealing ring 2, for measuring the temperature of the double sealing ring 2; the second temperature measuring element 33 is arranged in the second space 142 and adjacent to the heater 31, for measuring the temperature of the heater 31; the heating controller 34 is connected to the heater 31, the first temperature measuring element 32 and the second temperature measuring element 33, for controlling the heater 31 according to the measured values of the first temperature measuring element 32 and the second temperature measuring element 33, so as to simulate the heat release of the spent fuel; in particular, the power of the heater 31 is controlled according to the measured value of the first temperature measuring element 32 until the first temperature measuring element 32 reaches the working temperature of the spent fuel storage container; by arranging the first temperature measuring element 32 adjacent to the double sealing ring 2, the real temperature of the double sealing ring 2 can be more accurately reflected, which is closer to the actual working temperature; by measuring the temperature of the heater 31 with the second temperature measuring element 33, the temperature of the heater 31 is more consistent with the heat release temperature of the spent fuel; the heater 31 can be an electric heater; the first temperature measuring element 32 and the second temperature measuring element 33 are temperature sensors, such as thermocouples, thermal resistors or other existing temperature measuring elements.

[0034] Preferably, the heating assembly 3 comprises a plurality of first temperature measuring elements 32 and a plurality of second temperature measuring elements 33; the plurality of first temperature measuring elements 32 are uniformly distributed along the inner side of the double sealing ring 2, so as to more accurately measure the temperature change of the double sealing ring 2, such as taking the average of a plurality of measured values as the measured value, and the temperature change of each part; the plurality of second temperature measuring elements 33 are uniformly distributed in the second space 142; thus, the heat release temperature of the spent fuel and the temperature change of each part can be more accurately measured.

[0035] In some preferred embodiments, the leak detection device 4 comprises a helium concentration sensor 41, a communication pipe 42 and a helium mass spectrometer 43; the helium concentration sensor 41 is used to measure the helium concentration in the first space 141; the communication pipe 42 communicates the communication hole 121 and the helium mass spectrometer 43; preferably, the communication pipe 42 is a metal hose.

[0036] In some preferred embodiments, a plurality of helium concentration sensors 41 are included; the plurality of helium concentration sensors 41 are used to measure the helium concentration at least in the middle and bottom of the first space 141; based on the helium concentration measurements in the bottom and middle, the values are taken as the helium concentration in the first space, which are substituted into the following formula to calculate the real leakage rate more accurately.

[0037]

[0038] In the formula,

[0039] Q airis the measured value of the helium mass spectrometer leak detector;

[0040] Q mix is the measured value of the helium mass spectrometer leak detector;

[0041] P mix is the pressure of the mixed gas (helium and air) in the first space 141;

[0042] P He is the partial pressure of helium in the first space 141;

[0043] μ air , μ He are the dynamic viscosities of air and helium, respectively;

[0044] Pu is the ambient pressure in the test;

[0045] Pd is the pressure between the double sealing rings in the test;

[0046] P std is the standard atmospheric pressure.

[0047] In some preferred embodiments, the wall of the test container 1 corresponding to the first space 141 is provided with a gas inlet 15 for connecting an external helium pressure device, so that the first space 141 can be filled with helium by the external helium pressure device to simulate the working pressure condition of the spent fuel storage container.

[0048] Preferably, the wall of the test container 1 corresponding to the first space 141 is provided with a gas outlet 16 for discharging gas during the filling process of the gas inlet 15, so that the concentration of helium in the first space 141 can be controlled; specifically, the gas inlet 15 and the gas outlet 15 are both provided with valves.

[0049] In some preferred embodiments, as shown in FIG. 1, the test container 1 is provided with a second space 142, and the wall of the test container 1 corresponding to the second space 142 is provided with a gas inlet 17 for connecting an external helium pressure device, so that the second space 142 can be filled with helium by the external helium pressure device to simulate the working pressure condition of the spent fuel storage container. Figure 2As shown, the communication pipe 42 of the leak detection device 4 is connected to the communication hole 121 through the sealing connector 5; the sealing connector 5 is made of metal material with a larger thermal expansion coefficient than the cover 12, and is internally provided with a through channel 54, and includes a head part 51 and an insertion part 52; the head part 51 is larger in size than the communication hole 121, is arranged on the communication hole 121, and is screwed to the cover 12 through the bolt 6, and is sealed to the communication hole 121 through the sealing gasket 53; the insertion part 52 is connected to the head part 51 and is located in the communication hole 121, and can abut against the inner wall of the communication hole 121 after being heated; one end of the through channel 54 is connected to the communication pipe 42 and is fixedly connected, such as being welded, and the other end is located in the communication hole 121; based on the sealing connector 5 connecting the communication pipe 42 to the communication hole 121, the communication pipe 42 is convenient to disassemble; and when the insertion part 52 is heated and expanded, it can abut against the inner wall of the communication hole 121, so that the sealing performance between the sealing connector 5 and the communication hole 121 can be improved, and the gas in the environment can be prevented from entering to affect the accuracy of measurement; preferably, the insertion part 52 is fitted, such as being attached, to the communication hole 121.

[0050] In some preferred embodiments, the bolt rod 61 of the bolt 6 includes a cylindrical part 611 and a threaded part 612; the cylindrical part 611 is close to the nut 62 of the bolt 6, and is fitted to the through hole of the head part 51 with a gap; the sealing gasket 53 is made of material capable of being deformed under pressure, such as graphite material or other elastic material resistant to high temperature.

[0051] In some preferred embodiments, as shown in the drawings, Figure 3 As shown, the insertion part 52 is a conical frustum structure gradually expanding from one side of the head part 51 to the other side; the communication hole 121 is a conical hole matched with the insertion part 52, and the inner wall of the communication hole 121 is attached to the surface of the insertion part 52; based on the insertion part 52 and the communication hole 121 being both provided with the conical frustum structure, when the sealing connector 5 is screwed to the cover 12, the inner wall of the communication hole 121 is attached to the surface of the insertion part 52, so that the gap between them is smaller, and when the insertion part 52 is heated and expanded, it can be more closely attached to the inner wall of the communication hole 121, so that the sealing performance can be further improved; and based on the conical frustum structure, when it is expanded, a force along the extension direction of the communication hole is generated, so that the head part 51 is moved towards the cover 12, and the sealing performance between the head part 51 and the cover 12 is improved.

[0052] Preferably, the head part 51 and the insertion part 52 are screwed, and the head part 51 is provided with a threaded hole 511 for screwing the end of the insertion part 52; the communication pipe 42 is sealingly connected to the outer periphery of the threaded hole 511, based on which the head part 51 and the insertion part 52 can be disassembled, and during the screwing process of the head part 51 and the insertion part 52, the sealing gasket 53 can be tightly squeezed, and the insertion part 52 can be closely attached to the inner wall of the communication hole 121.

[0053] In some preferred embodiments, the double sealing ring 2 comprises an inner sealing ring 21 and an outer sealing ring 22; there is a gap between the inner sealing ring 21 and the outer sealing ring 22, and both are sealingly connected with the container body 11 and the cover 12.

[0054] The embodiments of the present application are described above with reference to the accompanying drawings, but the present application is not limited to the specific embodiments described above, which are merely illustrative rather than restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the purpose of the present application and the scope protected by the claims.

Claims

1. An apparatus for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions, characterized by, The device comprises a test container, double sealing rings, a heating assembly and a leak detection device. The test container comprises a container body, a cover and a partition plate. The cover is arranged on the container body and is connected to the container body by the double sealing rings to form a containing space inside the test container. The partition plate is arranged in the containing space and separates the containing space into a first space and a second space. The heating assembly is arranged in the second space. The leak detection device is connected to the gap between the double sealing rings through a communication hole of the cover. A communication pipe of the leak detection device is connected to the communication hole by a sealing connector. The sealing connector is made of a metal material with a larger thermal expansion coefficient than the cover and has a through channel and a head and an insertion part. The head is larger than the communication hole and is arranged on the communication hole and is connected to the cover by a bolt. The head is sealed to the communication hole by a sealing gasket. The insertion part is connected to the head and is located in the communication hole and can abut against the inner wall of the communication hole after heating.

2. The device for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions according to claim 1, characterized by One end of the through channel is connected to the communication pipe and the other end is located in the communication hole. The heating assembly comprises a heater, a first temperature measuring element, a second temperature measuring element and a heating controller. The heater is arranged in the second space. The first temperature measuring element is arranged in the first space and is adjacent to the double sealing rings to measure the temperature of the double sealing rings. The second temperature measuring element is arranged in the second space and is adjacent to the heater to measure the temperature of the heater.

3. The device for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions according to claim 2, characterized by The heating controller is connected to the heater, the first temperature measuring element and the second temperature measuring element to control the heater according to the measurement values of the first temperature measuring element and the second temperature measuring element.

4. The device for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions according to claim 1, characterized by A plurality of first temperature measuring elements and a plurality of second temperature measuring elements are arranged. The first temperature measuring elements are uniformly distributed along the inner side of the double sealing rings. The second temperature measuring elements are uniformly distributed in the second space.

5. The device for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions according to claim 4, characterized by The leak detection device comprises a helium concentration sensor, a communication pipe and a helium mass spectrometer.

6. The device for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions according to claim 1, characterized by The helium concentration sensor is used to measure the helium concentration in the first space. The communication pipe connects the communication hole and the helium mass spectrometer. A plurality of helium concentration sensors are arranged. The helium concentration sensors are used to measure the helium concentration in the middle and bottom of the first space. An inflation port is arranged on the wall of the test container corresponding to the first space to connect an external helium pressure device.

8. The apparatus for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions according to claim 1, characterized by, 7. The device for measuring the performance of a metal sealing ring for spent fuel storage under high temperature conditions according to claim 1, wherein The shank of the bolt comprises a cylindrical part and a threaded part. The cylindrical part is adjacent to the nut of the bolt and is connected to the through hole of the head by a gap. The sealing gasket is made of a material that can be deformed under pressure. The insertion part is a conical frustum structure that gradually expands from one side to the other side of the head. The communication hole is a conical hole that matches the surface of the insertion part.

9. The apparatus for measuring the performance of a metal seal ring for spent fuel storage under high temperature conditions according to claim 1, characterized by, The double sealing ring comprises an inner sealing ring and an outer sealing ring; a gap is provided between the inner sealing ring and the outer sealing ring, and both of the inner sealing ring and the outer sealing ring are sealingly connected with the container body and the cover body.

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