Secondary neutron source assembly storage device

Abstract

The invention provides a secondary neutron source assembly storage device which comprises a secondary neutron source assembly storage container, and the secondary neutron source assembly storage container is provided with a first hole position for insertion of a choke plug rod of a secondary neutron source assembly and a second hole position for insertion of a neutron source rod of the secondary neutron source assembly. When the secondary neutron source assembly is transported, a choke stopper rod of the secondary neutron source assembly can be inserted into the first hole position of the secondary neutron source assembly storage container, and a neutron source rod of the secondary neutron source assembly can be inserted into the second hole position of the secondary neutron source assembly storage container. Therefore, the secondary neutron source assembly can be shielded and supported in the transportation process. Compared with the prior art, the secondary neutron source assembly storage device disclosed by the invention not only can realize safe and reliable storage of the secondary neutron source assembly, but also can remarkably improve the economical efficiency, convenience and adaptability of the secondary neutron source assembly in the transfer process.

Description

Technical Field

[0001] This invention belongs to the field of nuclear technology, and specifically relates to a storage device for a secondary neutron source component. Background Technology

[0002] The secondary neutron source assembly is a key component for the startup and operation monitoring of a nuclear reactor. The secondary neutron source assembly includes a clamping section, a flow-blocking plug, and a neutron source rod. It has neutron and gamma radioactivity and is accompanied by a certain amount of decay heat. Its radioactive characteristics determine that it must be strictly sealed in a special transport container with shielding and containment capabilities during off-site transportation to ensure radiation safety and prevent the leakage of radioactive materials.

[0003] Currently, there is a significant gap in the transportation of secondary neutron source components both domestically and internationally: a lack of dedicated transport containers and supporting storage facilities. In practice, the transfer of these components necessitates the use of spent fuel transport containers originally designed for transporting spent fuel assemblies. However, this approach suffers from serious compatibility issues and economic shortcomings, specifically in the following two aspects:

[0004] 1) For economic reasons, the baskets of spent fuel transport containers are usually designed to hold dozens of spent fuel assemblies. However, the transport requirements of secondary neutron sources are usually no more than 3 assemblies. The large capacity design of spent fuel transport containers is extremely mismatched for secondary neutron source assemblies that only need to be transported 1 to 3 assemblies.

[0005] 2) The core storage structure inside the spent fuel transport container (often called a "basket") is designed for spent fuel assemblies that are completely different in size, weight and structure. The structure of the secondary neutron source assembly is completely different from that of the spent fuel assembly, so they cannot be adapted. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a storage device for secondary neutron source components, which can not only achieve safe and reliable storage of secondary neutron source components, but also significantly improve the economy, convenience and adaptability of its transportation process.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A secondary neutron source component storage device includes a secondary neutron source component storage container, wherein the secondary neutron source component storage container is provided with a first hole for inserting a flow-blocking plug rod of the secondary neutron source component, and a second hole for inserting a neutron source rod of the secondary neutron source component.

[0009] Optionally, the secondary neutron source component storage container includes a top pressure plate, a main body, and a base, which are stacked sequentially from top to bottom.

[0010] Optionally, it also includes a pull rod, a first locking nut, and a second locking nut. The pull rod passes sequentially through the top pressure plate, the main body, and the base. The first locking nut is locked to the end of the pull rod extending out of the top pressure plate, and the second locking nut is locked to the end of the pull rod extending out of the base.

[0011] Optionally, the main body includes a hollow forging and a solid forging, with the hollow forging disposed near the top pressure plate and the solid forging disposed near the base.

[0012] Optionally, the first hole is provided on the top pressure plate;

[0013] The second hole includes a first hole section and a second hole section arranged coaxially. The first hole section is disposed on the top pressure plate, and the second hole section is disposed on the solid forging and extends to the base.

[0014] A neutron source rod guide tube is also provided at the axial position corresponding to the second hole position, and the neutron source rod guide tube passes through the first hole section and the second hole section.

[0015] Optionally, the length of the neutron source rod conduit is greater than or equal to the length of the neutron source rod.

[0016] Optionally, the length of the first orifice is greater than or equal to the length of the flow-blocking plug.

[0017] Optionally, it also includes a water pipe, one end of which extends out of the top pressure plate for communication with a water source, and the other end of which is connected to the bottom surface of the base.

[0018] Optionally, a drainage hole is provided on the top of either the hollow forging or the solid forging.

[0019] Optionally, the top surface of the top pressure plate is further provided with a plurality of grooves adapted to the pressing part of the secondary neutron source assembly, and the depth of the grooves is less than the thickness of the top pressure plate;

[0020] Each of the grooves is provided with a set of positioning holes for fixing the secondary neutron source component, and each set of positioning holes includes the first hole and the second hole.

[0021] As can be seen from the above technical solutions, when transporting secondary neutron source components, the flow-blocking plug of the secondary neutron source component can be inserted into the first hole of the storage container of the secondary neutron source component, and the neutron source rod of the secondary neutron source component can be inserted into the second hole of the storage container of the secondary neutron source component, so as to achieve shielding and support during the transportation of the secondary neutron source component.

[0022] Compared with the prior art, the secondary neutron source component storage device disclosed in the embodiments of the present invention can not only achieve safe and reliable storage of secondary neutron source components, but also significantly improve the economy, convenience and adaptability of its transportation process. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of the secondary neutron source component storage device disclosed in the embodiments of the present invention;

[0025] Figure 2 This is a front view of the secondary neutron source component storage device disclosed in the embodiments of the present invention;

[0026] Figure 3 This is a right view of the secondary neutron source component storage device disclosed in the embodiments of the present invention;

[0027] Figure 4 This is a left view of the secondary neutron source component storage device disclosed in the embodiments of the present invention;

[0028] Figure 5 This is a cross-sectional view along the axis of the tie rod of the secondary neutron source component storage device disclosed in the embodiment of the present invention;

[0029] Figure 6 This is a cross-sectional view along the water pipe axis of the secondary neutron source component storage device disclosed in the embodiments of the present invention;

[0030] Figure 7 This is a schematic diagram of the internal structure of the secondary neutron source component storage device disclosed in the embodiments of the present invention;

[0031] Figure 8 This is a schematic diagram of the drainage hole arrangement structure disclosed in the embodiment of the present invention;

[0032] Figure 9 This is a cross-sectional view of the secondary neutron source component disclosed in the embodiments of the present invention;

[0033] Figure 10 This is a front view of the secondary neutron source component disclosed in the embodiments of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100 - Secondary neutron source component storage container; 101 - Top pressure plate; 1011 - Groove; 102 - Hollow forging; 103 - Solid forging; 104 - Base; 105 - First hole; 106 - Second hole; 107 - Pull rod; 108 - First locking nut; 109 - Second locking nut; 110 - Neutron source rod guide tube; 111 - Water pipe; 112 - Drain hole; 200 - Secondary neutron source component; 201 - Flow-blocking plug rod; 202 - Neutron source rod; 203 - Pressing part. Detailed Implementation

[0036] In view of this, the core of the present invention is to provide a secondary neutron source component storage device, which can not only realize the safe and reliable storage of secondary neutron source components, but also significantly improve the economy, convenience and adaptability of its transportation process.

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention. Please refer to [the accompanying drawings]. Figures 1-10 .

[0038] Secondary neutron source components refer to those activated during the first reactor cycle, which are then used in subsequent cycles to replace the primary neutron source for reactor refueling or for the startup of other new reactors.

[0039] Please refer to Figures 1-4 , Figures 9-10 The secondary neutron source component storage device disclosed in this embodiment of the invention includes a secondary neutron source component storage container 100. The secondary neutron source component storage container 100 is provided with a first hole 105 for inserting a flow-blocking plug 201 of the secondary neutron source component 200, and a second hole 106 for inserting a neutron source rod 202 of the secondary neutron source component 200.

[0040] When transporting the secondary neutron source component 200, the flow-blocking plug 201 of the secondary neutron source component 200 can be inserted into the first hole 105 of the secondary neutron source component storage container 100, and the neutron source rod 202 of the secondary neutron source component 200 can be inserted into the second hole 106 of the secondary neutron source component storage container 100, so as to achieve shielding and support during the transportation of the secondary neutron source component 200.

[0041] Compared with the prior art, the secondary neutron source component storage device disclosed in the embodiments of the present invention can not only achieve safe and reliable storage of the secondary neutron source component 200, but also significantly improve the economy, convenience and adaptability of its transportation process.

[0042] The embodiments of the present invention do not limit the specific structure of the secondary neutron source component storage container 100. Any structure that meets the requirements of the present invention is within the protection scope of the present invention.

[0043] For specific embodiments of the present invention, please refer to Figure 1 and Figure 5 The secondary neutron source component storage container 100 disclosed in this embodiment of the invention includes a top pressure plate 101, a main body and a base 104, wherein the top pressure plate 101, the main body and the base 104 are stacked sequentially from top to bottom.

[0044] Please refer to Figure 5 To achieve an effective connection between the top pressure plate 101, the main body, and the base 104, the secondary neutron source component storage device disclosed in this embodiment of the invention further includes a pull rod 107, a first locking nut 108, and a second locking nut 109. The pull rod 107 passes sequentially through the top pressure plate 101, the main body, and the base 104. The first locking nut 108 locks the end of the pull rod 107 extending from the top pressure plate 101, and the second locking nut 109 locks the end of the pull rod 107 extending from the base 104. With this configuration, the first locking nut 108 and the second locking nut 109 can lock both ends of the pull rod 107 to the two ends of the secondary neutron source component storage container 100.

[0045] As a further embodiment, the main body disclosed in this embodiment of the invention includes a hollow forging 102 and a solid forging 103. The hollow forging 102 is disposed near the top pressure plate 101, and the solid forging 103 is disposed near the base 104. The arrangement of the hollow forging 102 and the solid forging 103 can shield against radioactivity.

[0046] It should be noted that the decay heat released by the secondary neutron source component 200 is transferred to the secondary neutron source component storage device through conduction, convection and other means. The secondary neutron source component storage device then transfers the heat out through conduction and radiation. Therefore, the solid forging 103 can not only shield radioactivity, but also effectively dissipate the heat generated by the secondary neutron source component 200.

[0047] It should be further explained that in the secondary neutron source component storage device disclosed in the embodiments of the present invention, the first hole 105 is disposed on the top pressure plate 101, and the second hole 106 includes a first hole segment and a second hole segment arranged coaxially. The first hole segment is disposed on the top pressure plate 101, and the second hole segment is disposed on the solid forging 103 and extends to the base 104. A neutron source rod guide tube 110 is also disposed at the axial position corresponding to the second hole 106, and the neutron source rod guide tube 110 passes through the first hole segment and the second hole segment.

[0048] The neutron source rod conduit 110 provides lateral support and constraint for the neutron source rod from top to bottom. Even if the secondary neutron source assembly storage container 100 is subjected to violent shaking, tilting or even impact during transportation, the neutron source rod conduit 110 can prevent the neutron source rod 202 from bending, swinging or colliding with the hole wall of the second hole 106 within the second hole 106 to the greatest extent.

[0049] To ensure that the neutron source rod conduit 110 provides complete physical constraint, shielding, and critical safety control throughout the entire length of the neutron source rod 202, the length of the neutron source rod conduit 110 in the secondary neutron source assembly storage device disclosed in this embodiment of the invention is greater than or equal to the length of the neutron source rod 202. When the neutron source rod 202 is fully inserted, the entire neutron source rod 202 is enclosed within the neutron source rod conduit 110. Regardless of the direction of vibration or impact during transportation, any point of the neutron source rod 202 can be directly supported by the neutron source rod conduit 110, thereby preventing the neutron source rod 202 from bending due to excessive cantilever length. If the neutron source rod conduit 110 is shorter than the neutron source rod 202, a portion of the neutron source rod 202 will be suspended in mid-air, supported only by the second hole 106, making it highly susceptible to damage under lateral forces.

[0050] As a further embodiment, the length of the first orifice 105 disclosed in this embodiment of the invention is greater than or equal to the length of the flow-blocking plug 201. This arrangement ensures that the flow-blocking plug 201 is completely placed within the first orifice 105.

[0051] As a further embodiment, the secondary neutron source component storage device disclosed in this embodiment of the invention also includes a water pipe 111, one end of which extends out of the top pressure plate 101 for communication with a water source, and the other end is connected to the bottom end face of the base 104.

[0052] Because the secondary neutron source component 200 is highly radioactive, its installation in or removal from the storage device disclosed in this embodiment must be carried out underwater. Therefore, before installation, the secondary neutron source component 200 must be vertically placed in a dedicated hollow pressure vessel (i.e., a secondary neutron source component transport container). Water is then injected from the bottom of the transport container's interior through the water pipe 111 of this device until the container is full. Subsequently, the transport container, now filled with water and containing this device, is submerged underwater to complete the installation of the secondary neutron source component.

[0053] Furthermore, since dry transportation is employed during the transport phase, the water in the secondary neutron source component transport container must be drained through the water pipe 111 of this device before transportation. Similarly, when it is necessary to remove the secondary neutron source component, the transport container must first be refilled with water through the same water pipe 111 before being placed underwater to perform the removal operation.

[0054] As a further embodiment, the secondary neutron source component storage device disclosed in this embodiment of the invention also includes a water pipe 111, wherein one end of the water pipe 111 extends out of the top pressure plate 101 for communication with a water source, and the other end is connected to the bottom end face of the base 104.

[0055] As a further embodiment, in the secondary neutron source component storage device disclosed in this embodiment of the invention, drainage holes 112 are provided on the top of any hollow forging 102 and solid forging 103. This arrangement ensures that water can be smoothly drained between two adjacent hollow forgings 102, two adjacent solid forgings 103, and between adjacent hollow forgings 102 and solid forgings 103.

[0056] It should be noted that the storage device for the secondary neutron source component 200 disclosed in the embodiments of the present invention also has a plurality of grooves 1011 on the top surface of the top plate 101 that are adapted to the pressing part of the secondary neutron source component 200, wherein the depth of the grooves 1011 is less than the thickness of the top plate 101.

[0057] Specifically, each groove 1011 is provided with a set of positioning holes for fixing the secondary neutron source assembly 200, and each set of positioning holes includes a first hole position 105 and a second hole position 106.

[0058] The groove 1011 is shaped to match the clamping part 203 of the secondary neutron source assembly 200. When the secondary neutron source assembly 200 is inserted into the corresponding hole, its clamping part 203 will embed into the corresponding groove 1011. This structure provides precise horizontal positioning, preventing the secondary neutron source assembly 200 from undergoing slight rotation or translation in the first hole 105 or the second hole 106, ensuring that it is always in the predetermined orientation.

[0059] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A storage device for secondary neutron source components, characterized in that, The device includes a storage container for a secondary neutron source component, wherein the storage container is provided with a first hole for inserting a flow-blocking plug rod of the secondary neutron source component and a second hole for inserting a neutron source rod of the secondary neutron source component.

2. The secondary neutron source component storage device according to claim 1, characterized in that, The secondary neutron source component storage container includes a top pressure plate, a main body, and a base, which are stacked sequentially from top to bottom.

3. The secondary neutron source component storage device according to claim 2, characterized in that, It also includes a pull rod, a first locking nut and a second locking nut. The pull rod passes through the top pressure plate, the main body and the base in sequence. The first locking nut is locked to the end of the pull rod that extends out of the top pressure plate, and the second locking nut is locked to the end of the pull rod that extends out of the base.

4. The secondary neutron source component storage device according to claim 2, characterized in that, The main body includes a hollow forging and a solid forging. The hollow forging is disposed near the top pressure plate, and the solid forging is disposed near the base.

5. The secondary neutron source component storage device according to claim 4, characterized in that, The first hole is provided on the top pressure plate; The second hole includes a first hole section and a second hole section arranged coaxially. The first hole section is disposed on the top pressure plate, and the second hole section is disposed on the solid forging and extends to the base. A neutron source rod guide tube is also provided at the axial position corresponding to the second hole position, and the neutron source rod guide tube passes through the first hole section and the second hole section.

6. The secondary neutron source component storage device according to claim 5, characterized in that, The length of the neutron source rod conduit is greater than or equal to the length of the neutron source rod.

7. The secondary neutron source component storage device according to claim 1, characterized in that, The length of the first orifice is greater than or equal to the length of the flow-blocking plug.

8. The secondary neutron source component storage device according to claim 2, characterized in that, It also includes a water pipe, one end of which extends out of the top pressure plate for connection to a water source, and the other end of which is connected to the bottom surface of the base.

9. The secondary neutron source component storage device according to claim 4, characterized in that, Both the hollow forging and the solid forging have drainage holes at their tops.

10. The secondary neutron source component storage device according to claim 2, characterized in that, The top surface of the top pressure plate is also provided with a plurality of grooves adapted to the pressing part of the secondary neutron source component, and the depth of the grooves is less than the thickness of the top pressure plate. Each of the grooves is provided with a set of positioning holes for fixing the secondary neutron source component, and each set of positioning holes includes the first hole and the second hole.

Images