Extension device of irradiation cabin and irradiation system

Abstract

The invention discloses an extension device of an irradiation cabin and an irradiation system, which are used for connecting the irradiation cabin positioned at a reactor core of a reactor with a junction box positioned at a reactor top hall, the junction box is positioned above the irradiation cabin, and the extension device extends between the irradiation cabin and the junction box; the extension device comprises an extension body and a switching part, the upper end of the extension body is used for being connected with the junction box, the lower end of the extension body is connected with the upper end of the switching part, and the lower end of the switching part is used for being connected with the irradiation cabin. Wherein the junction box is located at the position of a reactor hall of a reactor and used for connecting external equipment, a gas source and the like, and the irradiation cabin is located at the position of a reactor core and used for irradiation. The extending device is simple in structure and comprises the extending body and the switching part, the irradiation cabin is connected with the extending body through the switching part, the connection reliability is improved, the irradiation cabin is communicated with the junction box through the extending device, the irradiation cabin can be conveniently assembled and disassembled from a reactor hall to a reactor core, and in the irradiation process, the extending device can support the irradiation cabin.

Description

Technical Field

[0001] The invention belongs to the field of molten salt reactor irradiation, and in particular relates to an extension device of an irradiation cabin and an irradiation system. Background Art

[0002] Reactors are a type of large radiation source with multiple types of rays, and the neutron source of the reactor is currently the main source used. The radiation environment in the reactor can be used for fuel material testing, neutron scattering experiments, radioactive nuclide irradiation production, neutron activation analysis, nuclear data measurement, neutron photography, single crystal material irradiation doping, nuclear instrument testing, etc. It can also be used to test the mechanical and electrical properties of materials or fuels when they are irradiated by neutrons in the reactor or after a specific irradiation dose. The irradiation device planning of the molten salt reactor is mainly used for the high-dose neutron irradiation performance research of the structural materials of the fourth-generation nuclear energy system, and provides important basic data and verification environment for the material development and verification of molten salt reactors and other fourth-generation nuclear reactors.

[0003] Among the existing reactors for irradiation tests, water reactors and sodium-cooled fast reactors are the main test reactor types. Their irradiation devices are immersed in coolants. During the test, the heat generated by the irradiation of the irradiation device can be taken away by the reactor coolant. Especially in pool-type water-cooled test reactors, the irradiation device even needs to be heated during the test in order to meet certain test temperature requirements.

[0004] According to the design plan of TMSR-LF1 and subsequent molten salt reactors, the irradiation device of the molten salt reactor adopts a channel tube structure to separate the irradiation device from the molten salt in the reactor. Due to the characteristics of liquid fuel molten salt reactors, the irradiation cabin needs to be installed in the channel tube for irradiation. Argon gas is used as a cover gas in the channel tube. After the irradiation cabin and the extension device are assembled and passed the pre-installation test, they are installed in the irradiation channel tube for irradiation.

[0005] As the irradiation cabin needs to be placed at the core position, and the disassembly, assembly and transfer of the irradiation cabin are all carried out in the reactor hall, the channel pipe of the irradiation device needs to pass directly from the core to the reactor hall. The irradiation cabin needs to use an extension section to load and unload the irradiation cabin. During the irradiation process, the extension section supports the irradiation cabin. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the irradiation chamber is placed in the core of the reactor, but the core is too far away from the reactor hall, which is inconvenient to operate, and to provide an extension device for the irradiation chamber and an irradiation system.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] An extension device for an irradiation cabin, used to connect the irradiation cabin located at the core of the reactor with a junction box located at the top hall of the reactor, the junction box is located above the irradiation cabin, and the extension device extends between the irradiation cabin and the junction box;

[0009] The extension device includes an extension body and a transition part, the upper end of the extension body is used to connect with the junction box, the lower end of the extension body is connected with the upper end of the transition part, and the lower end of the transition part is used to connect with the irradiation cabin.

[0010] In this scheme, an extension device is provided to connect the irradiation cabin and the junction box. The junction box is located in the reactor hall and is used to connect external equipment and gas sources. The irradiation cabin is located in the core and is used for irradiation. The extension device has a simple structure and includes an extension body and a transition part. The irradiation cabin is connected to the extension body through the transition part, which improves the reliability of the connection. The irradiation cabin is connected to the junction box through the extension device, which can facilitate the loading and unloading of the irradiation cabin from the reactor hall to the core. In addition, during the irradiation process, the extension device can support the irradiation cabin.

[0011] Preferably, a connector is provided at the connection between the adapter portion and the extension body;

[0012] A connecting pipeline is provided inside the extension body, one end of the connecting pipeline is connected to the connector, and the other end of the connecting pipeline is connected to the junction box.

[0013] In this solution, a connecting pipeline is arranged in the extended body for connecting the junction box at the reactor hall position and the irradiation cabin at the core position, wherein a connector is arranged for connecting one end of the connecting pipeline to the pipeline in the irradiation cabin, so that the pipeline in the irradiation cabin is connected to the junction box and can be used to connect external equipment.

[0014] Preferably, the extension body also includes a shell, which is a tubular structure, the connecting pipeline is located inside the shell, one end of the shell is connected to the junction box, and the other end of the shell extends downward and is sleeved on the connector and abuts against the top surface of the adapter.

[0015] In this solution, a tubular shell is provided for placing the connecting pipeline in the extended body, and the shell is completely covered outside the connecting pipeline to play a protective role. One end of the shell is sleeved on the connector, which improves the stability of the connection and effectively reduces the occurrence of radioactive leakage at the connection. At the same time, the end surface of the shell abuts against the top surface of the adapter, which improves the sealing of the connection. The shell has a simple structure and good use effect.

[0016] Preferably, a closed area is formed inside the extended body, the closed area is located between the connector and the junction box, and the closed area maintains a negative pressure state when the irradiation system is in operation.

[0017] In this scheme, a closed area is set up to cut off the connection between the extension device and the outside, so as to avoid radiation leakage through the extension device when the irradiation system is running, and by keeping the closed area in a negative pressure state at all times, further effective protection is provided to avoid radioactive leakage.

[0018] Preferably, the closed area is filled with argon gas.

[0019] In this solution, by filling the extended body with protective gas, radioactive leakage during the operation of the irradiation system can be effectively avoided.

[0020] Preferably, along the extension direction of the extension device, multiple sections of radiation absorbers are provided inside the shell, and wiring channels are provided inside and / or around the radiation absorbers, and the wiring channels of two adjacent sections of the radiation absorbers are at different radial positions of the cross section of the extension body.

[0021] In this solution, the radiation absorber is used to absorb radioactive radiation, reduce radiation leakage, and avoid accidents. A wiring channel is set inside and / or around the radiation absorber for placing connecting pipelines. The cross-sections of two adjacent sections of the radiation absorber in the extended body are at different radial positions. Multiple sections of the radiation absorber are alternately arranged, so that when the radioactive rays move linearly along the extended body, they will definitely pass through the radiation absorber, avoiding the occurrence of unabsorbed radioactive rays to prevent radioactive leakage.

[0022] Preferably, when the wiring channel is arranged around the radiation absorber, the outer diameter of the radiation absorber is smaller than the inner diameter of the shell, and the wiring channel is formed between the outer wall of the radiation absorber and the inner wall of the shell.

[0023] In this solution, the radiation absorber is arranged inside the shell and forms a gap between the radiation absorber and the inner wall of the shell. The gap serves as a wiring channel for arranging connecting pipelines.

[0024] Preferably, when the wiring channel is arranged inside the radiation absorber, the radiation absorber penetrates a channel in a central region thereof to form the wiring channel.

[0025] In this solution, the radiation absorber is attached to the inner side of the shell, and the central area is a through channel, which serves as a wiring channel for arranging connecting pipelines.

[0026] Preferably, the adapter part includes an adapter, which is sleeved on the other end of the connector, the pipeline in the irradiation chamber extends into the adapter and is connected to the connector, and the connecting pipeline is connected to the pipeline in the irradiation chamber through the connector.

[0027] In this solution, the adapter is sleeved on one end of the connector to make the connection structure more stable. The pipelines in the irradiation cabin are extended into the adapter to protect the pipelines extending from the irradiation cabin and avoid radiation leakage when the irradiation system is running. The pipelines in the irradiation cabin are connected to the connecting pipelines in the extension body through the connector, and are used to connect with the junction box in the stacking hall.

[0028] An irradiation system comprises an extension device for the irradiation chamber as described in any one of the above items.

[0029] The positive and progressive effect of the present invention is that an extension device is provided to connect the irradiation cabin and the junction box, the junction box is located in the reactor hall, and is used to connect external equipment and gas sources, etc., and the irradiation cabin is located in the core, and is used for irradiation. The extension device has a simple structure, including an extension body and a transition part, and the irradiation cabin is connected to the extension body through the transition part, which improves the reliability of the connection. The irradiation cabin is connected to the junction box through the extension device, which can facilitate the loading and unloading of the irradiation cabin from the reactor hall to the core, and during the irradiation process, the extension device can support the irradiation cabin. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of an extension device of an irradiation cabin in an embodiment of the present invention;

[0031] Figure 2 is a cross-sectional view of an extension device of an irradiation cabin in an embodiment of the present invention;

[0032] Figure 3 is a top view of a junction box in an embodiment of the present invention;

[0033] Figure 4 is a cross section of an extended body of an irradiation cabin in an embodiment of the present invention;

[0034] Figure 5 is another cross section of the extended body of the irradiation cabin in an embodiment of the present invention;

[0035] Figure 6 is a cross section of a transition portion in an embodiment of the present invention;

[0036] Figure 7 Schematic diagram of a cross section of an irradiation chamber in an embodiment of the present invention.

[0037] Description of reference numerals:

[0038] Irradiation Chamber 1

[0039] Junction Box 2

[0040] Extension body 3

[0041] Transfer unit 4

[0042] Connecting line 5

[0043] Connector 6

[0044] Radiation absorber 7

[0045] Shell 8

[0046] Confined area 9

[0047] Adapter 10

[0048] Opening 11 DETAILED DESCRIPTION

[0049] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0050] In the present embodiment, an extension device of the irradiation cabin 1 is provided, which is used to connect the irradiation cabin 1 located at the core of the reactor with the junction box 2 located at the top hall of the reactor. The junction box 2 is located above the irradiation cabin 1, and the extension device extends between the irradiation cabin 1 and the junction box 2; the extension device includes an extension body 3 and a transition part 4, the upper end of the extension body 3 is used to connect with the junction box 2, the lower end of the extension body 3 is connected with the upper end of the transition part 4, and the lower end of the transition part 4 is used to connect with the irradiation cabin 1.

[0051] An extension device is provided to connect the irradiation cabin 1 and the junction box 2. The junction box 2 is located in the reactor hall and is used to connect external equipment and gas sources. The irradiation cabin 1 is located in the core and is used for irradiation. The extension device has a simple structure and includes an extension body 3 and a transition part 4. The irradiation cabin 1 is connected to the extension body 3 through the transition part 4, which improves the reliability of the connection. The irradiation cabin 1 is connected to the junction box 2 through the extension device, which can facilitate the loading and unloading of the irradiation cabin 1 from the reactor hall to the core. In addition, during the irradiation process, the extension device can support the irradiation cabin 1.

[0052] Among them, a connector 6 is provided at the connection between the adapter 4 and the extension body 3; the extension body 3 has a connecting pipeline 5 inside, one end of the connecting pipeline 5 is connected to the connector 6, and the other end of the connecting pipeline 5 is connected to the junction box 2. The connecting pipeline 5 is provided in the extension body 3 to connect the junction box 2 at the reactor hall position and the irradiation cabin 1 at the core position, wherein the connector 6 is provided to connect one end of the connecting pipeline 5 with the pipeline in the irradiation cabin 1, so that the pipeline in the irradiation cabin 1 is connected to the junction box 2, which can be used to connect external equipment. There are jacks at both ends of the connector 6, and the connecting pipeline 5 and the pipeline in the irradiation cabin 1 are connected by inserting the jacks at both ends of the connector 6. In other embodiments, other components can also be provided as connectors between the connecting pipeline 5 and the pipeline in the irradiation cabin 1, as long as the components can be used to achieve connection without affecting the sealing.

[0053] Specifically, the pipelines in the irradiation chamber 1 include cables of thermocouples and air pipes for cooling, pressurization, etc. The connecting pipeline 5 is set as the corresponding pipeline in the irradiation chamber 1, so that it is led out to the junction box 2 through an extension device.

[0054] Furthermore, the extension body 3 also includes a shell 8, which is a tubular structure. The connecting pipeline 5 is located inside the shell 8. One end of the shell 8 is connected to the junction box 2, and the other end of the shell 8 extends downward and is sleeved on the connector 6, and abuts against the top surface of the adapter 4. The shell 8 with a tubular structure is used to place the connecting pipeline 5 in the extension body 3. The shell 8 is completely covered outside the connecting pipeline 5, which plays a protective role. One end of the shell 8 is sleeved on the connector 6, which improves the stability of the connection and effectively reduces the occurrence of radioactive leakage at the connection. At the same time, the end face of the shell 8 abuts against the top surface of the adapter 4, which improves the sealing of the connection. The shell 8 has a simple structure and good use effect. In other embodiments, shells 8 with different structures or different connection methods between the shell 8 and other components can also be set, as long as a place for the connecting pipeline 5 is provided and the sealing of the connection is not affected.

[0055] In this embodiment, a closed area 9 is formed inside the extension body 3, and the closed area 9 is located between the connector 6 and the junction box 2, and the closed area 9 maintains a negative pressure state when the irradiation system is in operation. An opening 11 such as an air filling port, a negative pressure inspection port, and a sampling port is provided on the top of the junction box 2 above the closed area 9, which is used for operators to check the state of the closed area 9, perform operations such as air filling and sampling. The closed area 9 is provided to cut off the connection between the extension device and the outside to prevent radiation from leaking through the extension device when the irradiation system is in operation, and by keeping the closed area 9 in a negative pressure state at all times, further effective protection is provided to prevent radioactive leakage.

[0056] The enclosed area 9 is filled with argon. By filling the extended body 3 with protective gas, radioactive leakage during operation of the irradiation system can be effectively avoided. In other embodiments, other methods can be used to replace the protective gas, as long as they can prevent radioactive leakage.

[0057] In this embodiment, along the extension direction of the extension device, multiple sections of radiation absorbers 7 are provided inside the shell 8, and wiring channels are provided inside and / or around the radiation absorbers 7, and the wiring channels of two adjacent sections of radiation absorbers 7 are located at different radial positions of the cross section of the extension body 3.

[0058] Specifically, the radiation absorber 7 is an absorber such as boron carbide or heavy metal, which has a good radioactive radiation absorption effect.

[0059] The radiation absorber 7 is used to absorb radioactive radiation, reduce radiation leakage, and avoid accidents. A wiring channel is set inside and / or around the radiation absorber 7 for placing the connecting pipeline 5. The cross-sections of two adjacent sections of the radiation absorber 7 in the extension body 3 are at different radial positions. Multiple sections of the radiation absorber 7 are alternately arranged so that when the radioactive rays move linearly along the extension body 3, they will definitely pass through the radiation absorber 7, avoiding the existence of unabsorbed radioactive rays to prevent radioactive leakage. In other embodiments, other structures can also be set to ensure that the radioactive rays always pass through the radiation absorber 7 in the extension device.

[0060] Further, when the wiring channel is arranged around the radiation absorber 7, the outer diameter of the radiation absorber 7 is smaller than the inner diameter of the shell 8, and a wiring channel is formed between the outer wall of the radiation absorber 7 and the inner wall of the shell 8. The radiation absorber 7 is arranged inside the shell 8, and a gap is formed between the radiation absorber 7 and the inner wall of the shell 8, and the gap is used as a wiring channel for arranging the connecting pipeline 5. The connecting pipeline 5 is arranged between the inner wall of the shell 8 and the outer wall of the radiation absorber 7, and is evenly arranged in the wiring channel.

[0061] Further, when the wiring channel is arranged inside the radiation absorber 7, the radiation absorber 7 penetrates the channel in the central area thereof and forms the wiring channel. The radiation absorber 7 is attached to the inner side of the housing 8, and the central area is a penetrating channel, and the channel is used as a wiring channel for arranging the connecting pipeline 5. The connecting pipeline 5 is attached to the inner wall of the central channel of the radiation absorber 7 and is evenly arranged in the wiring channel. In other embodiments, the positions of the radiation absorber 7 and the wiring channel can also be set to other structures, as long as the connecting pipeline 5 can pass through the radiation absorber 7 in the extension body 3.

[0062] In this embodiment, the adapter 4 includes an adapter 10, which is sleeved on the other end of the connector 6. The pipeline in the irradiation cabin 1 extends into the adapter 10 and is connected to the connector 6, and the connecting pipeline 5 is connected to the pipeline in the irradiation cabin 1 through the connector 6. The adapter 10 is sleeved on one end of the connector 6 to make the connection structure more stable. The pipeline in the irradiation cabin 1 is extended into the adapter 10, which can protect the pipeline extending from the irradiation cabin 1 and avoid radiation leakage when the irradiation system is running. The pipeline in the irradiation cabin 1 is connected to the connecting pipeline 5 in the extension body 3 through the connector 6, which is used to dock with the junction box 2 at the stacking hall position. In other embodiments, other components can also be set as adapters 10, and it is only necessary to achieve the pipeline docking function.

[0063] It is hereby explained that the extension device of the irradiation chamber 1 can be reused from the adapter 4. The adapter 4 can be destructively dismantled after the irradiation is completed. The part below the adapter 4 is transported to the irradiation device storage area, and the part above the adapter 4 is reused after being repaired.

[0064] An irradiation system is provided, comprising an extension device of the irradiation cabin 1 as described in any one of the above items.

[0065] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An extension device for an irradiation chamber, characterized in that: The extension device is used to connect the irradiation cabin located at the core of the reactor with the junction box located at the top hall of the reactor, the junction box is located above the irradiation cabin, and the extension device extends between the irradiation cabin and the junction box; The extension device includes an extension body and a transition part, the upper end of the extension body is used to connect with the junction box, the lower end of the extension body is connected with the upper end of the transition part, and the lower end of the transition part is used to connect with the irradiation cabin.

2. The extension device of the irradiation chamber according to claim 1, characterized in that: A connector is provided at the connection between the adapter and the extension body; A connecting pipeline is provided inside the extension body, one end of the connecting pipeline is connected to the connector, and the other end of the connecting pipeline is connected to the junction box.

3. The extension device of the irradiation chamber according to claim 2, characterized in that: The extension body also includes a shell, which is a tubular structure. The connecting pipeline is located inside the shell. One end of the shell is connected to the junction box, and the other end of the shell extends downward and is sleeved on the connector and abuts against the top surface of the adapter.

4. The extension device of the irradiation chamber according to claim 2, characterized in that: A sealed area is formed inside the extended body, the sealed area is located between the connector and the junction box, and the sealed area maintains a negative pressure state during irradiation.

5. The extension device of the irradiation chamber according to claim 4, characterized in that: The enclosed area is filled with argon gas.

6. The extension device of the irradiation chamber according to claim 3, characterized in that: Along the extension direction of the extension device, multiple sections of radiation absorbers are arranged inside the shell, and wiring channels are provided inside and / or around the radiation absorbers, and the wiring channels of two adjacent sections of the radiation absorbers are located at different radial positions of the cross section of the extension body.

7. The extension device of the irradiation chamber according to claim 6, characterized in that: When the wiring channel is arranged around the radiation absorber, the outer diameter of the radiation absorber is smaller than the inner diameter of the shell, and the wiring channel is formed between the outer wall of the radiation absorber and the inner wall of the shell.

8. The extension device of the irradiation chamber according to claim 6, characterized in that: When the wiring channel is disposed inside the radiation absorber, the radiation absorber penetrates a channel in a central region thereof to form the wiring channel.

9. The extension device of the irradiation chamber according to claim 2, characterized in that: The adapter part includes an adapter, which is sleeved on the other end of the connector. The pipeline in the irradiation chamber extends into the adapter and is connected to the connector. The connecting pipeline is connected to the pipeline in the irradiation chamber through the connector.

10. An irradiation system, characterized in that: An extension device for an irradiation chamber comprising the device described in any one of claims 1 to 9.

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