Device for fixing cladding on quartz tube and device for carrying out high-temperature oxidation test on cladding

Abstract

The embodiment of the invention relates to the field of nuclear reactor testing, in particular to a device for fixing a cladding to a quartz tube and a device for carrying out a high-temperature oxidation test on the cladding, and the device for fixing the cladding to the quartz tube comprises a first fixing piece, a clamping piece and a second fixing piece. The first fixing piece and the second fixing piece are both arranged to be connected with the clamping piece, the first fixing piece and the second fixing piece are both contracted when external force acts on the clamping piece, and the first fixing piece and the second fixing piece are both restored when the external force is removed from the clamping piece; wherein the first fixing piece abuts against the inner wall of the cladding when the first fixing piece is recovered, and the second fixing piece abuts against the inner wall of the quartz tube when the second fixing piece is recovered. The embodiment of the invention further provides a device for carrying out the high-temperature oxidation test on the cladding. According to the device for fixing the cladding to the quartz tube, the fixing operation can be simplified, remote operation of a manipulator is facilitated, and the efficiency of a high-temperature oxidation test is improved; and stable fixation of the cladding is facilitated.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of nuclear reactors, and in particular to a device for fixing a cladding to a quartz tube and a device for performing a high-temperature oxidation test on the cladding. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] When a reactor loss of coolant accident (LOCA) occurs, the core cooling deteriorates rapidly, causing the cladding temperature to rise rapidly and the cladding performance to degrade. In severe cases, it loses its first safety barrier function, posing a threat to the safety of the reactor. Therefore, this accident is one of the design basis accidents of pressurized water reactor nuclear power plants. When a loss of coolant accident occurs, nucleate boiling and film boiling will occur on the surface of the fuel elements, and the cladding temperature will rise sharply. After the emergency core cooling system is started, the cladding undergoes a sudden change in temperature due to the change in cooling conditions. During this process, the zirconium cladding is subjected to extreme conditions such as high-temperature oxidation, thermal shock and quenching, which will cause the cladding to rupture, thereby causing the nuclear fuel in the cladding to leak out.

[0004] At present, the existing safety standards are based on a large number of unirradiated cladding tests. With the continuous deepening of research, it has been proved that the existing standards may no longer be applicable to the safety evaluation of irradiated cladding. However, due to the radioactivity of irradiated cladding, it is not as easy to operate as in the out-of-pile test. It can only be operated by a manipulator, and the operating space is small. The existing out-of-pile hoisting and flat plate placement schemes have poor operability in the hot chamber, and there are problems such as long operation time and inability to effectively fix the short sample cladding. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] In view of the above problems, embodiments of the present application provide a device for fixing a cladding to a quartz tube and a device for performing a high temperature oxidation test on the cladding.

[0007] In a first aspect, an embodiment of the present application provides a device for fixing a cladding to a quartz tube, the device comprising a first fixing member, a clamping member and a second fixing member, wherein the first fixing member is configured to be connected to the clamping member, the second fixing member is configured to be connected to the clamping member, and the first fixing member and the second fixing member are configured to contract and contract when an external force acts on the clamping member, and when the external force is removed from the clamping member, the first fixing member and the second fixing member return to their original shape and return to their original shape; wherein the first fixing member is configured to abut against the inner wall of the cladding when it returns to its original shape, and the second fixing member is configured to abut against the inner wall of the quartz tube when it returns to its original shape.

[0008] According to the above-mentioned configuration, the short sample cladding fixing piece of the device for fixing the cladding to the quartz tube provided in the embodiment of the present application can realize the installation and removal of the short sample cladding in the quartz tube respectively by only one clamping of the manipulator, which can simplify the installation and removal operations of the cladding in the quartz tube, facilitate the remote operation of the manipulator, and facilitate improving the efficiency of the high-temperature oxidation test of the cladding after irradiation in the hot chamber; at the same time, the first fixing piece and the second fixing piece are configured to be able to abut against the inner wall of the cladding and the inner wall of the quartz tube respectively when restoring their original shapes, which is conducive to realizing the stable fixation of the cladding, thereby facilitating the high-temperature oxidation test of the cladding.

[0009] In a second aspect, an embodiment of the present application further provides a device for performing a high temperature oxidation test on a cladding, which comprises a quartz tube, a heating device, and the device provided by the embodiment of the first aspect of the present application. The cladding is arranged in the quartz tube; the heating device is arranged outside the quartz tube and heats the quartz tube; the device provided by the embodiment of the first aspect of the present application fixes the cladding in the quartz tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0011] Figure 1 It is a schematic diagram of the structure of a device for fixing a cladding and a quartz tube provided in an embodiment of the present application.

[0012] Figure 2 is to use Figure 1 The schematic diagram of the structure of the device after fixing the cladding and the quartz tube is shown.

[0013] Figure 3 is to use Figure 1 A schematic structural diagram of the device when the first fixing member abuts against the inner wall of the enclosure is shown.

[0014] Description of reference numerals:

[0015] 10. A device for fixing the cladding to the quartz tube; 11. A first fixing member; 111. A notch; 12. A second fixing member; 121. A notch; 13. A clamping member; 131. A clamping surface;

[0016] 20. Cladding; 30. Quartz tube.

[0017] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0018] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0019] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0020] The inventors of the present application discovered that since high-temperature oxidation tests on unirradiated cladding cannot fully reflect the condition of the irradiated cladding, in order to better understand the performance of the irradiated cladding under high-temperature oxidation conditions, it is necessary to conduct a high-temperature oxidation test on the irradiated cladding. However, since the irradiated cladding is radioactive, the irradiated cladding can only be operated by a manipulator in a hot chamber, and it is very difficult to fix the cladding by a manipulator. In addition, since the length of the cladding undergoing the high-temperature oxidation test is relatively small, the difficulty of operating the cladding is further increased.

[0021] To solve the above problems, see Figure 1 , Figure 2 and Figure 3The embodiment of the present application provides a device for fixing a cladding 20 to a quartz tube 30 (hereinafter referred to as the device 10), and the cladding 20 is fixed to the inside of the quartz tube 30 by the above device 10. The device 10 includes a first fixing member 11, a clamping member 13 and a second fixing member 12, wherein the first fixing member 11 is configured to be connected to the clamping member 13, and the second fixing member 12 is configured to be connected to the clamping member 13, and configured to shrink the first fixing member 11 and shrink the second fixing member 12 when an external force acts on the clamping member 13, and when the external force is removed from the clamping member 13, the first fixing member 11 and the second fixing member 12 are restored to their original shapes; wherein the first fixing member 11 is configured to abut against the inner wall of the cladding 20 when it is restored to its original shape, and the second fixing member 12 is configured to abut against the inner wall of the quartz tube 30 when it is restored to its original shape.

[0022] According to the above-mentioned configuration, the device 10 provided in the embodiment of the present application can realize the installation and disassembly of the cladding 20 in the quartz tube 30 respectively by only one clamping of the manipulator, which can simplify the installation and disassembly operations of the fixed cladding 20 in the quartz tube 30, facilitate remote operation of the manipulator, and facilitate improving the efficiency of the high-temperature oxidation test of the cladding after irradiation in the hot chamber; at the same time, the first fixing member 11 and the second fixing member 12 are configured to be able to abut against the inner wall of the cladding 20 and the inner wall of the quartz tube 30 respectively when restoring their original shapes, which is conducive to realizing the stable fixation of the cladding 20, thereby facilitating the high-temperature oxidation test of the cladding 20.

[0023] In some embodiments, the cladding 20 to be fixed may be an irradiated cladding 20 which is radioactive.

[0024] In some embodiments, when the first fixing member 11 is contracted, the first fixing member 11 may enter the enclosure 20 .

[0025] In some embodiments, the first fixing member 11, the second fixing member 12 and the clamping member 13 can be integrally formed. For example, the first fixing member 11, the second fixing member 12 and the clamping member 13 can be made of a ring tube by stamping. In other embodiments, the first fixing member 11, the second fixing member 12 and the clamping member 13 can be connected by welding. For example, the device 10 can be obtained by rolling a strip and then welding it.

[0026] In some embodiments, the material of the device 10 may be a high temperature resistant alloy, such as GH2747 alloy, niobium zirconium alloy, tantalum material, or other alloy materials.

[0027] See also Figure 1In some embodiments, the first fixing member 11 can be configured as a circular member with a notch 111, and connected to one end of the clamping member 13 at the notch 111. In some embodiments, the second fixing member 12 can also be configured as a circular member with a notch 121, and connected to the other end of the clamping member 13 at the notch 121. In such an embodiment, by configuring the first fixing member 11 and the second fixing member 12 as circular members with a notch 111 and a notch 121 respectively, the first fixing member 11 and the second fixing member 12 can shrink when an external force acts on the clamping member 13; and the first fixing member 11 and the second fixing member 12 can restore their original shapes when the external force is removed.

[0028] In some embodiments, the first fixing member 11 is located radially inside the second fixing member 12, so that the fixed cladding 20 can be located radially inside the quartz tube 30. In some embodiments, the radius of the circle of the first fixing member 11 is smaller than the radius of the circle of the second fixing member 12.

[0029] See also Figure 1 In some embodiments, the clamping surface 131 of the clamping member 13 may be disposed between the connection position with the first fixing member 11 and the connection position with the second fixing member 12. In such an embodiment, when an external force acts on the clamping member 13, the first fixing member 11 and the second fixing member 12 can both shrink; and when the external force is removed from the clamping member 13, the first fixing member 11 and the second fixing member 12 can both return to their original shapes.

[0030] See also Figure 1 In some embodiments, the first fixing member 11 has a first predetermined length along the extension direction of the cladding 20, the second fixing member 12 has a second predetermined length along the extension direction of the cladding 20, and the clamping member 13 has a third predetermined length along the extension direction of the cladding 20, the first predetermined length is greater than the third predetermined length, and the second predetermined length is greater than or equal to the third predetermined length. In such an embodiment, the first predetermined length is greater than the third predetermined length so that the inner wall of the cladding 20 abuts against the outer wall of the first fixing member 11; at the same time, since both the first fixing member 11 and the second fixing member 12 are annular in design, the high-temperature steam from the bottom of the quartz tube can flow between the inner surface and the outer surface of the cladding 20, which is conducive to ensuring that the inner surface and the outer surface of the cladding 20 are oxidized at the same time.

[0031] See also Figure 2In some embodiments, the position where the first fixing member 11 is connected to the clamping member 13 can be set to be an arc shape, and the radius of the arc shape is set so that when the first fixing member 11 is restored to its original shape and abuts against the inner wall of the cladding 20, the abutment force between the two is within a predetermined range, so as to avoid the abutment force causing damage to the cladding 20, thereby avoiding affecting the test results of the high-temperature oxidation test. In some embodiments, the abutment force between the first fixing member 11 and the cladding 20 can be controlled by controlling the radius of the arc shape at the position where the first fixing member 11 is connected to the clamping member 13.

[0032] In some embodiments, the first fixing member 11 and the cladding 20 structurally satisfy the following expression, so that the quartz tube 30 is stably connected to the first fixing member 11 and the quartz tube 30 can be prevented from being elastically damaged by the first fixing member 11:

[0033]

[0034] Among them, F a It is the difference between the gravity of the cladding 20 and the force exerted by the gas flow on the cladding 20 during the high temperature oxidation test.

[0035] μ 1 is the sliding friction coefficient between the first fixing member 11 and the cladding 20 .

[0036] R a0 is the middle value between the inner diameter and the outer diameter of the first fixing member 11 after deformation.

[0037] α a It is half of the opening angle of the notch 111 after the first fixing member 11 is deformed.

[0038] I a is the moment of inertia of the circular cross section of the first fixing member 11 .

[0039] G a is the shear elastic modulus of the material of which the first fixing member 11 is made.

[0040] A a is the area of ​​the circular cross section of the first fixing member 11 .

[0041] k a is the annular interface shear shape coefficient of the first fixing member 11.

[0042] E a is the elastic modulus of the material of which the first fixing member 11 is made.

[0043] R c2 is the inner diameter of the cladding 20.

[0044] R a1 is the outer diameter of the first fixing member 11 before deformation.

[0045] In such an embodiment, the cladding 20 can be stably connected to the first fixing member 11 according to the above expression, and the cladding 20 can be prevented from being damaged by the abutment force between the first fixing member 11 and the cladding 20 when the first fixing member 11 returns to its original shape.

[0046] See also Figure 1 In some embodiments, the position where the second fixing member 12 is connected to the clamping member 13 may also be set to be an arc shape, and the radius of the arc shape is set so that when the second fixing member 12 is restored to its original shape and abuts against the inner wall of the quartz tube 30, the abutting force between the two is within a predetermined range, so as to avoid the abutting force causing damage to the quartz tube 30, thereby avoiding affecting the test results of the high-temperature oxidation test. In some embodiments, the abutting force between the second fixing member 12 and the quartz tube 30 can be controlled by controlling the radius of the arc shape at the position where the second fixing member 12 is connected to the clamping member 13.

[0047] See also Figure 2 In some embodiments, the second fixing member 12 and the quartz tube 30 structurally satisfy the following expression, so that the quartz tube 30 and the second fixing member 12 are stably connected and the quartz tube 30 can be prevented from being elastically damaged by the second fixing member 12 .

[0048]

[0049] Among them, F b It is the difference between the sum of the gravity of the cladding 20, the first fixing member 11, the second fixing member 12 and the clamping member 13 and the force exerted by the airflow on the above four during the high temperature oxidation test.

[0050] μ 2 is the sliding friction coefficient between the second fixing member 12 and the cladding 20 .

[0051] R b0 is the middle value between the inner diameter and the outer diameter of the second fixing member 12 after deformation.

[0052] α b It is half of the opening angle of the notch 121 of the second fixing member 12 after deformation.

[0053] I b is the moment of inertia of the circular cross section of the second fixing member 12.

[0054] G b is the shear elastic modulus of the material of the second fixing member 12 .

[0055] A b is the area of ​​the circular cross section of the second fixing member 12.

[0056] kb is the annular interface shear shape coefficient of the second fixing member 12.

[0057] E b is the elastic modulus of the material of which the second fixing member 12 is made.

[0058] R d2 is the inner diameter of the quartz tube 30.

[0059] R b1 is the outer diameter of the second fixing member 12 before deformation.

[0060] In such an embodiment, the quartz tube 30 can be stably connected to the second fixing member 12 according to the above expression, and the quartz tube 30 can be prevented from being damaged by the abutment force between the second fixing member 12 and the quartz tube 30 when the second fixing member 12 returns to its original shape.

[0061] The embodiment of the present application also provides a device for performing a high temperature oxidation test on the cladding 20, which may include a quartz tube 30, a heating device, and the device 10 provided in the embodiment of the present application. The cladding 20 is arranged in the quartz tube 30; the heating device is arranged outside the quartz tube 30 and heats the quartz tube 30; the device 10 provided in the embodiment of the present application can fix the cladding 20 in the quartz tube 30. In such an embodiment, the cladding 20 is fixed to the quartz tube 30 using the device 10 provided in the embodiment of the present application, so that the cladding 20 can be firmly fixed without welding the cladding 20 and the quartz tube 30, which is conducive to performing a high temperature oxidation test on the cladding 20.

[0062] In some embodiments, when performing a high temperature oxidation test, steam flows through the quartz tube 30. In some embodiments, the heating device may be a heating furnace, which heats the quartz tube 30 outside the quartz tube 30, thereby indirectly heating the cladding 20. In some embodiments, the heating device may also directly heat the cladding 20.

[0063] In some embodiments, the device for performing a high temperature oxidation test on the cladding 20 may further include a manipulator, which is configured to operate the device 10 for fixing the cladding 20 to the quartz tube 30, so as to complete the operation of fixing the cladding 20 to the quartz tube 30 by remote operation. In such an embodiment, the operation of fixing the cladding 20 to the quartz tube 30 by remote operation using a manipulator can reduce manual participation, which is conducive to reducing the radiation to which the operator is exposed.

[0064] The process of fixing the cladding 20 to the quartz tube 30 using a manipulator and the device 10 provided in an embodiment of the present application includes: using the manipulator to apply an external force to the clamp 13 so that the first fixing member 11 and the second fixing member 12 shrink, placing the cladding 20 on the first fixing member 11, and then using the manipulator to load the device 10 into the quartz tube 30; when the device 10 reaches a suitable position in the quartz tube 30, slowly release the manipulator, remove the external force applied to the clamp 13 by the manipulator, and the first fixing member 11 and the second fixing member 12 return to their original shape, thereby completing the fixation of the cladding 20 to the quartz tube 30.

[0065] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0066] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A device for fixing a cladding to a quartz tube, characterized in that: It includes: a first fixing member, a clamping member, and a second fixing member, wherein the first fixing member is configured to be connected to the clamping member, and the second fixing member is configured to be connected to the clamping member, And it is arranged that when an external force acts on the clamping member, the first fixing member contracts and the second fixing member contracts, and when the external force is removed from the clamping member, the first fixing member returns to its original shape and the second fixing member returns to its original shape, wherein, The first fixing member is configured to abut against the inner wall of the cladding when the first fixing member returns to its original shape, and the second fixing member is configured to abut against the inner wall of the quartz tube when the second fixing member returns to its original shape.

2. The device according to claim 1, characterized in that The first fixing member is configured as a circular member having a notch, and is connected to one end of the clamping member at the notch. The second fixing member is configured as a circular member with a notch, and is connected to the other end of the clamping member at the notch.

3. The device according to claim 2, characterized in that The clamping surface of the clamping member is arranged between a connection position between the clamping member and the first fixing member and a connection position between the clamping member and the second fixing member.

4. The device according to claim 1, characterized in that The first fixing member has a first predetermined length along the extension direction of the shell, the second fixing member has a second predetermined length along the extension direction of the shell, and the clamping member has a third predetermined length along the extension direction of the shell, the first predetermined length is greater than the third predetermined length, and the second predetermined length is greater than or equal to the third predetermined length.

5. The device according to claim 2, characterized in that The position where the first fixing member is connected to the clamping member is arranged in an arc shape, and the radius of the arc shape is arranged so that when the first fixing member abuts against the inner wall of the cladding when it returns to its original shape, the abutment force between the two is within a predetermined range, so as to avoid the abutment force causing damage to the cladding.

6. The device according to claim 5, characterized in that The first fixing member and the cladding shell structurally satisfy the following expression, so that the quartz tube is stably connected to the first fixing member and the quartz tube can be prevented from being elastically damaged by the first fixing member: Among them, F a is the difference between the gravity of the cladding and the force exerted by the gas flow on the cladding during the high temperature oxidation test, μ1 is the sliding friction coefficient between the first fixing member and the cladding, R a0 is the middle value between the inner diameter and the outer diameter of the first fixing member after deformation, α a is half of the opening angle of the notch after the first fixing member is deformed, I a is the moment of inertia of the circular cross section of the first fixing member, G a is the shear elastic modulus of the material of which the first fixing member is made, A a is the area of ​​the circular cross section of the first fixing member, k a is the annular interface shear shape coefficient of the first fixing member, E a is the elastic modulus of the material of which the first fixing member is made, R c2 is the inner diameter of the cladding, R a1 is the outer diameter of the first fixing member before deformation.

7. The device according to claim 2, characterized in that The position where the second fixing member is connected to the clamping member is arranged in an arc shape, and the radius of the arc shape is arranged so that when the second fixing member abuts against the inner wall of the quartz tube when it returns to its original shape, the abutting force between the two is within a predetermined range, so as to avoid damage to the quartz tube caused by the abutting force.

8. The device according to claim 2, characterized in that The second fixing member and the quartz tube satisfy the following expression in structure, so that the quartz tube and the second fixing member are stably connected and the quartz tube can be prevented from being elastically damaged by the second fixing member: Among them, F b is the difference between the sum of the gravity of the cladding, the first fixing member, the second fixing member and the clamping member and the force exerted by the airflow on the above four members during the high temperature oxidation test, μ2 is the sliding friction coefficient between the second fixing member and the cladding, R b0 is the middle value between the inner diameter and the outer diameter of the second fixing member after deformation, α b is half of the opening angle of the notch after the second fixing member is deformed, I b is the moment of inertia of the circular cross section of the second fixing member, G b is the shear elastic modulus of the material of which the second fixing member is made, A b is the area of ​​the circular cross section of the second fixing member, k b is the annular interface shear shape coefficient of the second fixing member, E b is the elastic modulus of the material of which the second fixing member is made, R d2 is the inner diameter of the quartz tube, R b1 is the outer diameter of the second fixing member before deformation.

9. A device for performing high temperature oxidation test on cladding, characterized in that: It includes: A quartz tube, wherein the cladding is disposed in the quartz tube; A heating device, which is arranged outside the quartz tube and heats the quartz tube; The device according to any one of claims 1 to 8 is used to fix the cladding in the quartz tube.

10. The device according to claim 9, characterized in that Also includes: A manipulator is configured to operate a device for fixing the cladding to the quartz tube, so as to complete the operation of fixing the cladding to the quartz tube by remote operation.

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