Fuel assembly vacuum off-line sipping simulation device

Abstract

The invention particularly relates to a vacuum off-line sipping simulation device for a fuel assembly. The vacuum off-line sipping simulation device comprises a sipping tube consisting of an outer tube and an inner tube, a radioactive gas detection device, a vacuum device, a heating rod and a crevasse opening and closing device, the top of the outer cylinder is provided with a gas path interface, the top of the inner cylinder is provided with a vacuum interface, the outer cylinder is connected with a radioactive gas detection device through the gas path interface, and the inner cylinder is connected with a vacuum device through the vacuum interface; the heating rod is placed in the inner cylinder; the crevasse opening and closing device is connected to the outer cylinder in an up-down rotating mode, and opening or closing of the crevasse of the inner cylinder is achieved. According to the fuel assembly vacuum off-line sipping simulation device, simulation of crevasse sizes and crevasse positions of different sizes of the fuel assembly is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of radioactive gas detection of fuel assemblies, in particular to a vacuum off-line sipping simulation device for fuel assemblies. Background Art

[0002] Fuel assemblies are exposed to high temperature, high pressure and radiation for a long time. Due to the combined effects of temperature, pressure, irradiation, thermal stress and manufacturing defects of fuel assemblies, some fuel assemblies may be damaged, causing the radioactive fission products inside the fuel assemblies to be released into the primary circuit system, causing the nuclear power plant to shut down or operate at reduced power. Therefore, fuel assemblies must be inspected for damage.

[0003] The fuel assembly damage inspection is carried out in the fuel assembly vacuum offline sipping device, which includes a sipping tube, a radioactive gas detection device and a vacuum device; the sipping tube is provided with an air path interface and a vacuum interface; the sipping tube is connected to the radioactive gas detection device through the air path interface and is connected to the vacuum device through the vacuum interface; the fuel assembly is placed in the sipping tube, and a pressure difference between the inner and outer walls of the fuel assembly is achieved by evacuating the inside of the sipping tube, thereby accelerating the release of radioactive gas inside the fuel assembly, and the released radioactive gas enters the radioactive gas detection device through the air path interface for radioactive gas detection via the internal loop.

[0004] In order to explore the release and detection rules of radioactive gas in fuel assemblies, it is necessary to quantitatively analyze the size and position of the breach in the fuel assembly to obtain the release and detection rules of radioactive gas in the fuel assembly. Therefore, it is necessary to design a vacuum offline sipping simulation device for fuel assemblies to simulate the changes in the size and position of the breach in the fuel assembly, so as to create conditions for the subsequent acquisition of the release and detection rules of radioactive gas in the fuel assembly. Summary of the invention

[0005] The purpose of the present invention is to provide a fuel assembly vacuum off-line sipping simulation device to achieve the simulation of the rupture sizes and rupture positions of fuel assemblies of different sizes.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A fuel assembly vacuum offline sipping simulation device comprises a sipping tube consisting of an outer tube and an inner tube, a radioactive gas detection device, a vacuum device, a heating rod, and a breach opening and closing device; the outer tube is provided with an air path interface at the top, the inner tube is provided with a vacuum interface at the top, the outer tube is connected to the radioactive gas detection device via the air path interface, and the inner tube is connected to the vacuum device via the vacuum interface; the heating rod is placed in the inner tube; the breach opening and closing device is connected to the outer tube by rotating up and down to realize opening or closing of the breach of the inner tube.

[0008] The fuel assembly vacuum offline sipping simulation device simulates the fuel assembly damage inspection. It simulates the rupture sizes of the inner cylinder by installing rupture gaskets of different sizes on the inner cylinder, and simulates the rupture positions at different heights of the inner cylinder by applying different external air pressures to the inner cylinder.

[0009] Furthermore, the breach opening and closing device includes a joystick, a rotating shaft, a flexible plug and a replaceable breach gasket; a breach is provided on the lower side of the inner cylinder, and the replaceable breach gasket is sealed in the breach; the end of the rotating shaft close to the inner cylinder is connected to the flexible plug, and the end of the rotating shaft away from the inner cylinder is connected to the joystick; the flexible plug matches the replaceable breach gasket to achieve the flexible plug being pressed and sealed in the replaceable breach gasket; a through rotating shaft mounting groove is provided on the lower side of the outer cylinder; a first locking thread is provided on a section of the outer surface above the end of the rotating shaft away from the inner cylinder, and the A second locking thread matching the locking thread is provided on a section of the inner surface above the notch of the shaft mounting groove away from the inner cylinder; the first locking thread is consistent with the second locking thread in length; the end of the shaft close to the inner cylinder passes through the shaft mounting groove, and the end of the shaft away from the inner cylinder is outside the outer cylinder; the first locking thread is screwed into or out of the shaft mounting groove by rotating the joystick; when the first locking thread is completely screwed into the shaft mounting groove, the flexible plug is pressed and sealed in the replaceable breach gasket; the shaft and the shaft mounting groove are sealed to ensure air tightness during the rotation of the shaft.

[0010] Furthermore, the replaceable breach gasket is sealed and connected in the breach via a first sealing ring that matches it.

[0011] Furthermore, the rotating shaft and the rotating shaft mounting groove are sealed by a second sealing ring to ensure air tightness during the rotation of the rotating shaft.

[0012] Furthermore, the fuel assembly vacuum off-line sipping simulation device also includes a visual window that is detachably fixed and sealed and installed on the upper side of the outer cylinder.

[0013] Beneficial technical effects of the present invention:

[0014] The fuel assembly vacuum off-line sipping simulation device of the present invention can quickly open or close the inner cylinder breach outside the sipping cylinder through the breach opening and closing device 4 while having good sealing performance, can simulate breach sizes of the inner cylinder by installing breach gaskets of different sizes on the inner cylinder, and can simulate breach positions of different heights of the inner cylinder by applying external air pressures of different sizes to the inner cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic structural diagram of a vacuum off-line sipping simulation device for a fuel assembly of the present invention;

[0016] Figure 2It is a schematic diagram of the structure of the breach opening and closing device.

[0017] In the figure, 1. heating rod; 2. outer tube; 3. inner tube; 4. breach opening and closing device; 5. visual window; 6. gas path interface; 7. vacuum interface; 8. joystick; 9. first locking thread; 10. rotating shaft; 11. flexible plug; 12. first sealing ring 12; 13. replaceable breach gasket; 14. second sealing ring. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1-2 The present embodiment provides a vacuum offline sipping simulation device for a fuel assembly, comprising a sipping tube consisting of an outer tube 2 and an inner tube 3, a radioactive gas detection device, a vacuum device, a heating rod, and a breach opening and closing device 4; a gas path interface 6 is provided on the top of the outer tube 2, a vacuum interface 7 is provided on the top of the inner tube 3, the outer tube 2 is connected to the radioactive gas detection device via the gas path interface 6, and the inner tube 3 is connected to the vacuum device via the vacuum interface 7; the heating rod is placed in the inner tube 3; the breach opening and closing device 4 is connected to the outer tube 2 by rotating up and down, so as to open or close the breach of the inner tube 3.

[0020] The fuel assembly vacuum offline sipping simulation device simulates the fuel assembly damage inspection. It simulates the rupture sizes of the inner cylinder by installing rupture gaskets of different sizes on the inner cylinder, and simulates the rupture positions at different heights of the inner cylinder by applying different external air pressures to the inner cylinder.

[0021] Furthermore, the fuel assembly vacuum off-line sipping simulation device also includes a visual window 5 which is detachably fixed and sealedly mounted on the upper side of the outer tube 2 .

[0022] Furthermore, the breach opening and closing device 4 includes an operating lever 8, a rotating shaft 10, a flexible plug 11 and a replaceable breach gasket 13; a breach is provided on the lower side of the inner tube 3, and the replaceable breach gasket 13 is sealed and connected in the breach; the end of the rotating shaft 10 close to the inner tube 3 is connected to the flexible plug 11, and the end of the rotating shaft 10 away from the inner tube 3 is connected to the operating lever 8; the flexible plug 11 matches the replaceable breach gasket 13, so that the flexible plug 11 is pressed and sealed in the replaceable breach gasket 13; a through rotating shaft mounting groove is provided on the lower side of the outer tube 2; a first locking device is provided on a section of the outer surface above the end of the rotating shaft 10 away from the inner tube 3 Thread 9, a second locking thread matching the locking thread 9 is provided on a section of the inner surface above the notch of the shaft mounting groove away from the inner cylinder 3; the first locking thread 9 is consistent in length with the second locking thread; the end of the shaft 10 close to the inner cylinder 3 passes through the shaft mounting groove, and the end of the shaft 10 away from the inner cylinder 3 is outside the outer cylinder 2; the first locking thread 9 is screwed into or out of the shaft mounting groove by rotating the joystick 8; when the first locking thread 9 is completely screwed into the shaft mounting groove, the flexible plug 11 is pressed and sealed in the replaceable breach gasket 13; the shaft 10 and the shaft mounting groove are sealed to ensure the air tightness during the rotation of the shaft 10.

[0023] Furthermore, the replaceable breach gasket 13 is sealed and connected in the breach through a first sealing ring 12 that matches it.

[0024] Furthermore, the rotating shaft 10 and the rotating shaft mounting groove are sealed by a second sealing ring 14 to ensure air tightness during the rotation of the rotating shaft 10 .

[0025] The fuel assembly vacuum off-line sipping simulation device of the present invention is used to carry out a fuel assembly vacuum off-line sipping simulation experiment, comprising the following steps:

[0026] 1. Install the heating rod 1, outer tube 2 and inner tube 3 to the bottom mounting table;

[0027] 2. Install the visual window 5 and the gas path interface 6 on the outer tube 2;

[0028] 3. Install the vacuum interface 7 onto the inner tube 3;

[0029] 4. Install the joystick 8, the rotating shaft 10, the flexible plug 11, the first sealing ring 12, the replaceable breach gasket 13 and the second sealing ring 14 onto the outer tube 2 and the inner tube 3;

[0030] 5. Install the sipping tube onto the container bracket;

[0031] 6. The internal circuit of the sucking tube circulates to ensure the internal pressure environment and ensure that the breach is in a closed state;

[0032] 7. Rotate the joystick 8 to open the breach, simulating the damage of the fuel assembly;

[0033] 8. The leaked gas passes through the internal loop of the suction tube to the radioactive gas detection device for analysis, and this stage of the experiment ends;

[0034] 9. Replace the replaceable breach gasket 13 and repeat steps 6, 7 and 8 to simulate breach sizes and breach positions of different sizes of fuel assemblies.

[0035] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fuel assembly vacuum off-line sipping simulation device, characterized in that: The invention comprises a sipping tube consisting of an outer tube (2) and an inner tube (3), a radioactive gas detection device, a vacuum device, a heating rod, and a breach opening and closing device (4); the outer tube (2) is provided with an air path interface (6) at the top, the inner tube (3) is provided with a vacuum interface (7) at the top, the outer tube (2) is connected to the radioactive gas detection device via the air path interface (6), and the inner tube (3) is connected to the vacuum device via the vacuum interface (7); the heating rod is placed in the inner tube (3); the breach opening and closing device (4) is connected to the outer tube (2) by rotating up and down, so as to realize the opening or closing of the breach of the inner tube (3).

2. The fuel assembly vacuum off-line sipping simulation device according to claim 1, characterized in that: The breach opening and closing device (4) comprises an operating rod (8), a rotating shaft (10), a flexible plug (11) and a replaceable breach gasket (13); a breach is provided on the lower side of the inner tube (3), and the replaceable breach gasket (13) is sealed and connected in the breach; the end of the rotating shaft (10) close to the inner tube (3) is connected to the flexible plug (11), and the end of the rotating shaft (10) away from the inner tube (3) is connected to the operating rod (8); the flexible plug (11) matches the replaceable breach gasket (13) to achieve the flexible plug (11) being pressed and sealed in the replaceable breach gasket (13); a through rotating shaft mounting groove is provided on the lower side of the outer tube (2); a section of the outer surface above the end of the rotating shaft (10) away from the inner tube (3) A first locking thread 9 is provided on the surface, and a second locking thread matching the locking thread 9 is provided on the inner surface of the shaft mounting groove above the groove away from the inner cylinder (3); the first locking thread 9 is consistent in length with the second locking thread; the end of the shaft (10) close to the inner cylinder (3) passes through the shaft mounting groove, and the end of the shaft (10) away from the inner cylinder (3) is outside the outer cylinder (2); the first locking thread 9 is screwed into or out of the shaft mounting groove by rotating the operating lever (8); when the first locking thread 9 is completely screwed into the shaft mounting groove, the flexible plug (11) is pressed and sealed in the replaceable breach gasket (13); the shaft (10) and the shaft mounting groove are sealed to ensure air tightness during the rotation of the shaft (10).

3. The fuel assembly vacuum off-line sipping simulation device according to claim 2, characterized in that: The replaceable breach gasket (13) is sealed and connected in the breach via a first sealing ring (12) that matches it.

4. The fuel assembly vacuum off-line sipping simulation device according to claim 2, characterized in that: The rotating shaft (10) and the rotating shaft installation groove are sealed by a second sealing ring (14), thereby ensuring air tightness during the rotation of the rotating shaft (10).

5. The fuel assembly vacuum off-line sipping simulation device according to any one of claims 1 to 4, characterized in that: The fuel assembly vacuum off-line sipping simulation device also comprises a visual window (5) which is detachably fixedly sealed and installed on the upper side of the outer cylinder (2).

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