A nuclear fuel irradiation test section device

Abstract

The present invention discloses a nuclear fuel irradiation test section device, comprising an outer tube, wherein the upper end of the outer tube is coaxially sleeved with an upper joint, and the lower end is coaxially sleeved with a lower joint, wherein the upper joint is used to connect with the irradiation device section, and the lower joint is used to insert into the grid plate of the core, and a plurality of clamp block assemblies are coaxially arranged in the outer tube from top to bottom between the upper joint and the lower joint, and the clamp block assemblies are provided with a slot for coaxially installing a fuel assembly and a through slot for allowing cooling water to pass through. The present invention adopts an axially stacked manner to arrange a plurality of clamp block assemblies, and multiple groups of fuel can be assembled at the same time. Such a structure can increase the loading capacity of the fuel assembly, and the clamp block assembly adopts a frame structure, which provides sufficient space for the passage of cooling water.

Description

Technical Field

[0001] The invention relates to the technical field of reactor fuel irradiation, and in particular to a nuclear fuel irradiation test section device. Background Art

[0002] The development and research of nuclear fuel requires a long period of time. As a very critical link in the development and research of nuclear fuel, the quality of the irradiation test design will determine the progress of the research and development of new fuels. The various nuclear material and nuclear fuel irradiation tests conducted in my country require that the irradiated fuel be loaded into the irradiation device and tested in the reactor. In order to truly reflect the fuel behavior in the actual operating environment in the future, it is necessary to design the corresponding fuel irradiation device according to the conditions of the irradiation test.

[0003] At present, the irradiation test of nuclear fuel in a research and test reactor needs to be arranged in a corresponding irradiation test device. According to the classification of irradiation methods, irradiation test devices are divided into loop irradiation test devices and irradiation test devices with irradiation tanks. Usually, loop irradiation test devices are used for irradiation tests that require enhanced cooling, and irradiation test devices with irradiation tanks are used for irradiation tests with low heat release. However, due to the limitations of factors such as cost, cycle and irradiation facilities, irradiation test devices with irradiation tanks are generally used for nuclear fuel irradiation tests. In view of the requirements of fuel irradiation tests, the present invention designs an irradiation test section device of a fuel irradiation device for conducting nuclear fuel irradiation tests in a pressure shell type research and test reactor.

[0004] In view of this, this application is hereby filed. Summary of the invention

[0005] The purpose of the present invention is to provide a new nuclear fuel irradiation test section device, which is used to load fuel assemblies and complete the irradiation task required by the test in the reactor; at the same time, when completing the irradiation test in the fuel reactor, the fuel assemblies can be cooled by a loop of water to reach the fuel irradiation temperature required by the test.

[0006] The present invention is achieved through the following technical solutions:

[0007] A nuclear fuel irradiation test section device comprises an outer tube, wherein an upper joint is coaxially sleeved on the upper end of the outer tube, and a lower joint is coaxially sleeved on the lower end. The upper joint is used to connect with the irradiation device section, and the lower joint is used to insert into the grid plate of the core. A plurality of clamp block assemblies are coaxially arranged in sequence from top to bottom in the outer tube between the upper joint and the lower joint. A clamp block assembly is provided with a slot for coaxially installing a fuel assembly and a through slot for allowing cooling water to pass through.

[0008] The present invention adopts an axially stacked manner to set up multiple clamp block assemblies, which can assemble multiple groups of fuel at the same time. Such a structure can increase the loading capacity of the fuel assembly. At the same time, the clamp block assembly adopts a frame structure, which provides sufficient space for the passage of cooling water.

[0009] The lower joint of the present invention mainly plays the role of intercepting flow, which is used to ensure that there is a certain amount of water storage inside the outer tube so that the primary circuit water can immerse the fuel assembly; the upper joint is an open structure, which can be combined with a flow control system and a parameter monitoring system to complete controllable operations, so that different types of irradiation device sections can be combined to complete the irradiation test task of the fuel.

[0010] Furthermore, an upper clamping plate is provided at the upper end of the uppermost clamping block assembly, and a lower clamping plate is provided at the lower end of the lowermost clamping block assembly. The end surfaces of the upper and lower clamping plates in contact with the clamping block assembly are provided with fixing grooves for fixing the ends of the fuel assembly, and the upper and lower clamping plates are both provided with through holes for allowing cooling water to pass through; a clamping plate is provided between two adjacent clamping block assemblies, and fixing grooves for fixing the ends of the fuel assembly are provided on both side surfaces of the clamping plate, and the clamping plate is also provided with through holes for allowing cooling water to pass through.

[0011] The present invention arranges an upper clamping plate, a clamping plate and a lower clamping plate at the end of the clamping block assembly and between the two. When the fuel assembly is installed in the clamping block assembly, the end can be clamped in the fixing grooves on the upper clamping plate, the clamping plate and the lower clamping plate, which can ensure that the clamping block assemblies will not rotate or misalign with each other, improve the stability of the components, and thus keep the fuel assembly in the axial direction in the same plane, which is convenient for irradiation of the positive and negative surfaces in the pile.

[0012] Furthermore, an upper partition pipe is arranged between the upper clamping plate and the upper joint, and a lower partition pipe and a mixer are arranged in sequence between the lower clamping plate and the lower joint.

[0013] Furthermore, the clamp block assembly includes two upper clamp blocks and two lower clamp blocks, the upper clamp blocks and the lower clamp blocks have the same structure and are both semi-cylinders, and the two upper clamp blocks and the two lower clamp blocks are connected to form a column with a cavity inside, and the height of the column is the same as the length of the fuel assembly.

[0014] The clamp block assembly of the present invention is composed of four parts, so as to ensure that the fuel assembly can be smoothly taken out from the clamp block assembly after irradiation, and avoid the situation that the fuel assembly is difficult to take out from the clamp block after irradiation; the upper clamp block is processed with a semicircular groove, and the lower clamp block is processed with a semicircular protrusion that docks with the upper clamp block, which can ensure the relative position between the upper clamp block and the lower clamp block and avoid the misalignment of the two.

[0015] Furthermore, the mixer is provided with three groups of annular holes, which can stabilize the water flow and avoid turbulence when the primary circuit water flows through the mixer, causing the irradiation test section to shake in the pile.

[0016] Furthermore, there are at least five clamp block assemblies, and two groups of slots are provided in the clamp block assemblies, which can be used to install two fuel assemblies and can assemble at least 10 groups of fuel, thereby increasing the loading capacity compared with previous devices.

[0017] Furthermore, a thermocouple through hole is processed on the clamping block assembly, in which a thermocouple is installed, which can be used to detect the water temperature at the inlet and outlet of the test section, measure the temperature difference, and then calculate the thermal power.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0019] 1. A nuclear fuel irradiation test section device provided in an embodiment of the present invention adopts an axially stacked manner to set a plurality of clamp block assemblies, which can simultaneously assemble multiple groups of fuel. Such a structure can increase the loading capacity of the fuel assembly. At the same time, the clamp block assembly adopts a frame structure, which provides sufficient space for the passage of cooling water;

[0020] 2. A nuclear fuel irradiation test section device provided in an embodiment of the present invention has an upper clamping plate, a clamping plate and a lower clamping plate arranged at the end of the clamping block assembly and between the two, so that the end of the fuel assembly can be clamped in the fixing grooves on the upper clamping plate, the clamping plate and the lower clamping plate, so as to ensure that the clamping block assemblies will not rotate and misalign with each other, thereby improving the stability of the components, so that the fuel assembly in the axial direction is kept in the same plane, which is convenient for irradiation of the positive and negative surfaces in the pile;

[0021] 3. In a nuclear fuel irradiation test section device provided by an embodiment of the present invention, the clamp block assembly is composed of four parts, which provides a guarantee for the smooth removal of the fuel assembly after irradiation, and avoids the fuel assembly after irradiation from being unable to be removed from the clamp block. At the same time, the upper clamp block and the lower clamp block are respectively processed with installation grooves and protrusions to ensure the mutual position between the clamp blocks and avoid misalignment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the structure provided by an embodiment of the present invention;

[0024] Figure 2 A top view of a clamp block assembly provided in an embodiment of the present invention;

[0025] Figure 3 AA cross-sectional schematic diagram provided by an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the structure of an upper clamping block provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of a splint structure provided by an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the lower clamping plate structure provided by an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the upper clamping plate structure provided in an embodiment of the present invention.

[0030] Reference numerals and corresponding parts names:

[0031] 1-upper joint, 2-outer tube, 3-upper partition tube, 4-upper clamp, 5-fuel assembly, 6-clamp, 7-clamp block assembly, 71-upper clamp, 72-lower clamp, 8-lower clamp, 9-lower partition tube, 10-mixer, 11-lower joint, 12-slot, 13-through slot. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0033] In the following description, a large number of specific details are set forth in order to provide a thorough understanding of the present invention. However, it is apparent to one of ordinary skill in the art that these specific details are not necessarily employed to practice the present invention. In other embodiments, in order to avoid obscuring the present invention, well-known structures, circuits, materials, or methods are not specifically described.

[0034] Throughout the specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment of the present invention. Therefore, the phrases "one embodiment," "an embodiment," "an example," or "an example" appearing in various places throughout the specification do not necessarily all refer to the same embodiment or example. In addition, particular features, structures, or characteristics may be combined in one or more embodiments or examples in any suitable combination and / or sub-combination. In addition, it will be appreciated by those of ordinary skill in the art that the figures provided herein are for illustrative purposes and that the figures are not necessarily drawn to scale. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] In the description of the present invention, the directions or positional relationships indicated by terms such as “front”, “rear”, “left”, “right”, “up”, “down”, “vertical”, “horizontal”, “high”, “low”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the scope of protection of the present invention.

[0036] Example 1

[0037] like Figure 1-Figure 7 As shown, a nuclear fuel irradiation test section device provided by an embodiment of the present invention comprises an upper joint 1, an outer tube 2 and a lower joint 11, wherein the lower end of the outer tube 2 is connected to the lower joint 11, the upper joint 1 is coaxially sleeved on the upper end of the outer tube 2, and the upper joint 1, the outer tube 2 and the lower joint 11 form a space in the outer tube 2. In the outer tube 2, an upper spacer 3 is installed at the lower end of the upper joint 1, an upper clamping plate 4 is installed next to the upper spacer 3, 5 clamping block assemblies 7 are coaxially stacked in the outer tube 2, a clamping plate 6 is installed between two adjacent clamping block assemblies 7, a lower clamping plate 8 is installed at the bottom end of the last layer of clamping block assemblies 7, a lower spacer 9 and a mixer 10 are installed in sequence between the lower clamping plate 8 and the lower joint 11, and fuel assemblies 5 are installed in the clamping block assemblies 7 in pairs.

[0038] In order to facilitate the smooth removal of the fuel assembly after irradiation, the above-mentioned clamping block assembly 7 is composed of two upper clamping blocks 71 and two lower clamping blocks 72. The upper clamping blocks and the lower clamping blocks are provided with a slot 12 for mounting the fuel assembly 5 and a through slot 13 for allowing cooling water to pass through; the two upper clamping blocks 71 are butt-jointed to form a column with a cavity, and the two lower clamping blocks 72 are also butt-jointed to form a column with a cavity, and then the two columns are axially butt-jointed to form the clamping block assembly 7.

[0039] Preferably, in order to ensure that the clamp block assemblies will not rotate or misalign with each other and to improve the stability of the components, the upper clamp plate 4, the clamp plate 6 and the lower clamp plate 8 are processed with fixing grooves for fixing the fuel assembly 5, and are processed with cooling water holes, so that the ends of the fuel assembly can be stuck in the fixing grooves on the upper clamp plate, the clamp plate and the lower clamp plate, thereby ensuring that the fuel assembly in the axial direction remains in the same plane, which is convenient for irradiation of the positive and negative surfaces in the pile.

[0040] Preferably, positioning keys are processed around the upper clamping plate, the clamping plate and the lower clamping plate to achieve relative fixation between the upper clamping plate, the clamping plate and the lower clamping plate and the outer tube, thereby preventing the overall structure composed of the clamping block assembly and the clamping plate from rotating relative to the outer tube.

[0041] Preferably, in order to ensure the relative position between the clamping blocks and avoid misalignment, the upper clamping block 71 is processed with a semicircular groove that docks with the lower clamping block 72, the lower clamping block 72 is processed with a semicircular protrusion that docks with the upper clamping block 71, and the upper clamping block 71 and the lower clamping block 72 are processed with thermocouple through holes.

[0042] Example 2

[0043] A nuclear fuel irradiation test section device provided in an embodiment of the present invention is used to load fuel assemblies and carry new fuel to be irradiated for irradiation in a reactor. When used, the device is usually combined with an irradiation device section to complete the irradiation task.

[0044] In order to ensure smooth loading into the reactor, during the assembly process, the coaxiality of the upper joint, the outer tube and the lower joint is monitored, and it is ensured that the maximum outer diameter does not exceed the inner diameter of the channel. After the assembly is completed, the device is in the core, the lower joint is inserted into the grid plate of the core, the upper end is an open interface, and the port of the device section is a cylindrical structure that matches the clearance of the upper joint of the present invention. Move downward along the upper joint until it is docked with the outer tube to complete the installation.

[0045] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A nuclear fuel irradiation test section device, characterized in that: The outer tube (2) comprises an outer tube (2), the upper end of the outer tube (2) is coaxially sleeved with an upper joint (1), and the lower end of the outer tube (2) is coaxially sleeved with a lower joint (11), the upper joint (1) is used to be connected to the irradiation device section, and the lower joint (11) is used to be inserted into the grid plate of the core, and a plurality of clamping block assemblies (7) are coaxially arranged in sequence from top to bottom in the outer tube (2) between the upper joint (1) and the lower joint (11), and the clamping block assemblies (7) are provided with a clamping groove (12) for coaxially mounting a fuel assembly (5) and a through groove (13) for allowing cooling water to pass through; An upper clamping plate (4) is arranged at the upper end of the uppermost clamping block assembly (7), and a lower clamping plate (8) is arranged at the lower end of the lowermost clamping block assembly (7). The end surfaces of the upper clamping plate (4) and the lower clamping plate (8) contacting the clamping block assembly (7) are provided with fixing grooves for fixing the ends of the fuel assembly (5), and the upper clamping plate (4) and the lower clamping plate (8) are both provided with through holes for allowing cooling water to pass through. A clamping plate (6) is arranged between two adjacent clamping block assemblies (7), and fixing grooves for fixing the ends of the fuel assembly (5) are arranged on both sides of the clamping plate (6), and a through hole for allowing cooling water to pass through is also opened on the clamping plate (6); An upper partition tube (3) is arranged between the upper clamping plate (4) and the upper joint (1), and a lower partition tube (9) and a mixer (10) are arranged in sequence between the lower clamping plate (8) and the lower joint (11).

2. The nuclear fuel irradiation test section device according to claim 1, characterized in that: The clamp block assembly (7) comprises two upper clamp blocks (71) and two lower clamp blocks (72). The upper clamp blocks (71) and the lower clamp blocks (72) have the same structure and are both semi-cylindrical. After the two upper clamp blocks (71) and the two lower clamp blocks (72) are butt-jointed, a column with a cavity inside is formed. The height of the column is the same as the length of the fuel assembly (5).

3. The nuclear fuel irradiation test section device according to claim 1, characterized in that: The mixer (10) is provided with three groups of annular holes.

4. The nuclear fuel irradiation test section device according to claim 1, characterized in that: Two groups of slots are provided in the clamp block assembly (7) and can be used to install two fuel assemblies (5).

5. The nuclear fuel irradiation test section device according to claim 2, characterized in that: A semicircular groove is processed on the upper clamping block (71), and a semicircular protrusion is processed on the lower clamping block (72) to be connected with the upper clamping block (71).

6. The nuclear fuel irradiation test section device according to claim 1, characterized in that: There are at least five clamping block assemblies (7).

7. The nuclear fuel irradiation test section device according to claim 1, characterized in that: A thermocouple through hole is processed on the clamping block assembly (7).

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