A nuclear environmental sampling system shield
By employing a multi-layered shielding device composed of lead tiles arranged in a specific pattern in the spent fuel sampling system, the problem of excessive radiation in the spent fuel sampling system was solved, achieving effective radiation protection and operational convenience.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- XIAN NUCLEAR EQUIP CO LTD
- Filing Date
- 2022-06-14
- Publication Date
- 2026-04-17
AI Technical Summary
In the existing spent fuel sampling system, multiple pipelines have excessive radiation doses, affecting the safety of operators, and the limited space prevents the use of conventional protective measures.
The system employs a barrel-shaped structure consisting of lower, middle, and upper lead tiles, combined with stainless steel plates and cylinders, to form a multi-layered lead shielding device. The lead tiles are arranged in a specific stepped and rotating manner to ensure the thickness of each lead tile and the tightness of its installation.
In space-constrained situations, the gaps between tiles are minimized to ensure the protective thickness of each lead tile, providing effective shielding performance, facilitating single-person operation, and ensuring operator safety.
Smart Images
Figure CN117275781B_ABST
Abstract
Description
Technical Field
[0001] This invention pertains to shielding devices, specifically a shielding system for nuclear environmental sampling. Background Technology
[0002] Spent fuel is a byproduct of nuclear fuel reactions. If it is not reprocessed, it will cause serious environmental pollution and affect people's health. Therefore, it must be reprocessed.
[0003] During the reprocessing of spent fuel, manual sampling and analysis of spent fuel waste liquid is typically required using a sampling system. To protect operators from or reduce excessive radiation exposure during sampling, radiation protection measures must be implemented for the excessive radiation components of the sampling system to ensure operator safety.
[0004] Multiple pipelines in a spent fuel high-level radioactive waste liquid sampling system have excessive radiation doses, which could affect the safety of operators and must be protected. However, due to the limited space around the multiple pipelines in the system and the prohibition of high temperatures, conventional protection is not sufficient. Summary of the Invention
[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a shielded nuclear environmental sampling system.
[0006] The specific technical solution adopted in this invention is as follows: A shielding system for nuclear environmental sampling includes a lower section lead tile group, a middle section lead tile group, and an upper section lead tile group connected sequentially. The lower section lead tile group is located at the bottom, the upper section lead tile group is located at the top, and the middle section lead tile group is located in the middle. The lower section lead tile group, the middle section lead tile group, and the upper section lead tile group form a barrel structure.
[0007] The nuclear environmental sampling system shielding described above includes a base plate installed below the lower lead tile group, a stainless steel plate installed on the upper lead tile group, a stainless steel inner cylinder installed on the inner wall of the barrel structure formed by the lower, middle, and upper lead tile groups, and a stainless steel outer casing installed on the outer wall of the barrel structure.
[0008] The nuclear environmental sampling system shielding described above includes multiple sets of pipes installed between a base plate and a stainless steel plate.
[0009] As described above, the shielding of the nuclear environmental sampling system includes a lower section of lead tile group consisting of 360° / c° groups of tiles. The lower end face of each group of lead tiles is flat, and the upper end is stepped from the inside to the outside, with a step difference of t. In the circumferential direction, the lead tiles in each group rotate a° in the same direction from the inside to the outside. The radius of the lead tiles increases from the inside to the outside, and the increase in radius is equal to the tile thickness t.
[0010] The nuclear environmental sampling system shielding described above includes a lower section of lead tile group where each lead tile has a thickness of t, an outer layer height of h, and the remaining heights increase by t from the outside to the inside. The angle is c°, the arc length is L-1 mm, and the tile radii from the inside to the outside are r, r+t, r+2t, ...
[0011] As described above, the shielding of the nuclear environmental sampling system includes a middle section of lead tile group composed of 360° / c° groups of tiles. The lower end of each group is stepped from the inside out, and the upper end is stepped from the inside out, with a step difference of t. In the circumferential direction, the lead tiles in each group rotate a° in the same direction from the inside out. The radius of the lead tiles increases from the inside out, and the radius increase is equal to the tile thickness t. The height is h1, the angle is c°, and the arc length is L-1 mm. The tile radii from the inside out are r, r+t, r+2t, ...
[0012] As described above, the shielding of the nuclear environmental sampling system includes an upper section of lead tile group consisting of 360° / c° groups of tiles. The upper surfaces of each group of lead tiles are flush, and the lower ends are stepped from the inside out, with a step difference of t. In the circumferential direction, the lead tiles in each group rotate a° sequentially from the inside out, and the radius of the lead tiles increases sequentially from the inside out, with the radius increase being equal to the tile thickness t.
[0013] The nuclear environmental sampling system shielding described above includes an upper section of lead tile group where each tile has a thickness of t, an inner layer height of h2, and the remaining heights increase by t from the inside out. The angle is c°, the arc length is L-1 mm, and the tile radii from the inside out are r, r+t, r+2t, ...
[0014] The present invention has the following advantages over the prior art: (1) While reducing the gap between the same layer, it minimizes the gap between the tile layers and ensures the overall size of the shielding cylinder after assembly; (2) It ensures the protective thickness of each lead tile in the shielding cylinder and the quality of each lead tile, laying the foundation for later installation; (3) Using n layers of lead tiles with a thickness of t and using staggered installation of adjacent lead tiles, the effective protective thickness of lead shielding reaches (n-1) *t; (4) It ensures the overall shielding performance after the lead shielding cylinder is installed; (5) It minimizes the number of lead tiles and considers the convenience of single-person operation in space-constrained situations. Attached Figure Description
[0015] Figure 1 For the structure of the protective device
[0016] Figure 2 A simplified structural diagram of a single group of lead tile assemblies in the lower section.
[0017] Figure 3 yes Figure 2View A
[0018] Figure 4 It is a single-unit structure of the middle section lead tile group.
[0019] Figure 5 yes Figure 4 View from direction B
[0020] Figure 6 It is a single-unit structure of upper section lead tile group.
[0021] Figure 7 yes Figure 6 C-direction view
[0022] Figure 8 Schematic diagram of lead tile assembly installation
[0023] Figure 9 yes Figure 8 AA-direction sectional view
[0024] Figure 10 yes Figure 8 BB-direction section view
[0025] Figure 11 yes Figure 8 Central CC-direction section view
[0026] Figure 12 yes Figure 8 DD-direction sectional view
[0027] The components include: 1. Lower section lead tile set; 2. Middle section lead tile set; 3. Upper section lead tile set; 4. Stainless steel plate; 5. Multiple sets of pipes; 6. Stainless steel inner cylinder; 7. Stainless steel outer casing; 8. Foundation plate. Detailed Implementation
[0028] The present invention will be further described and illustrated below with reference to the accompanying drawings and specific embodiments.
[0029] The protective device is a lead-shielded cylindrical structure, as shown in the attached image. Figure 1 As shown, it includes a stainless steel outer casing (number 7), lead tile groups (numbers 1, 2, and 3), a stainless steel inner casing (number 6), and a base plate (number 8). The lead tiles inside the lead tile groups (numbers 1, 2, and 3) wrap around the outer surface of the inner casing (number 6). The overall structure of the lead shielding cylinder inside the protective device is composed of m sections of lead tile groups (numbers 1, 2, and 3) stacked together, with each section divided into 360° / c° groups, and each group containing n lead tiles.
[0030] The lower section of the lead tile group (serial number 1) consists of 360° / c° groups of tiles. The lower surfaces of each group of lead tiles are flush, and the upper surfaces are stepped from the inside out, with a step difference of t. In the circumferential direction, the lead tiles in each group rotate a° sequentially from the inside out, with the radius increasing from the inside out, the increase in radius equal to the tile thickness t. The lead tile thickness in each group is t, the outer layer height is h, and the remaining heights increase from the outside in to t, with an angle of c° and an arc length of L-1 mm. The tile radii from the inside out are r, r+t, r+2t, ... . The structure of a single lower section of the lead tile group is as follows: Figure 2 As shown.
[0031] The middle section of the lead tile group (serial number 2) consists of 360° / c° groups of tiles. Each group has an increasing stepped shape at the bottom from the inside out, and a decreasing stepped shape at the top from the inside out, with a step difference of t. In the circumferential direction, the lead tiles in each group rotate a° sequentially from the inside out. The radius of the lead tiles increases sequentially from the inside out, with the radius increase equal to the tile thickness t. The height is h1, the angle is c°, and the arc length is L-1 mm (unfolded). The tile radii from the inside out are r, r+t, r+2t, ... . The structure of a single lower section of the lead tile group is as follows: Figure 3 As shown.
[0032] The upper section of the lead tile group (serial number 3) consists of 360° / c° groups of tiles. The upper surfaces of each group of lead tiles are flush, and the lower surfaces are stepped from the inside out, with a step difference of t. In the circumferential direction, the lead tiles in each group rotate a° sequentially from the inside out, with the radius increasing from the inside out, the radius increase being equal to the tile thickness t. The tile thickness in each group is t, the inner layer height is h2, and the remaining heights increase from the inside out to t, with an angle of c° and an arc length of L-1 mm. The tile radii from the inside out are r, r+t, r+2t, ... . The structure of a single upper section of the lead tile group is as follows: Figure 4 As shown.
[0033] The assembly relationship between each section of lead tile group (serial number 1, serial number 2, serial number 3) is as follows: Figure 5 As shown, the assembly relationship between each segment (number 1, number 2, number 3) is as follows: Figure 5 Main view, see below for the installation orientation of each individual lead tile group (serial number 1). Figure 5 For the installation orientation of each individual group in the middle section AA lead tile group (serial number 2), see [reference]. Figure 5 For the installation orientation of each individual group of the middle BB, CC, and lower section lead tile group (serial number 3), see [reference]. Figure 5 DD (Chinese DD)
[0034] The typical ranges or typical values of the above parameters are as follows:
[0035] a° = 1°~3°
[0036] The t range is 5mm to 10mm
[0037] r ranges from 281 to 281+ntmm
[0038] c° ranges from 30° to 60°
[0039] L ranges from 294 to 410 mm
[0040] h = 220mm
[0041] h1 = 210mm
[0042] h2 = 210m.
Claims
1. A nuclear environmental sampling system shield, characterized by: It includes a lower section lead tile group (1), a middle section lead tile group (2) and an upper section lead tile group (3) connected sequentially. The lower section lead tile group (1) is located at the bottom, the upper section lead tile group (3) is located at the top, and the middle section lead tile group (2) is located in the middle. The lower section lead tile group (1), the middle section lead tile group (2) and the upper section lead tile group (3) form a barrel structure. A base plate (8) is set below the lower section lead tile group (1), a stainless steel plate (4) is set on the upper section lead tile group (3), a stainless steel inner cylinder (6) is set on the inner wall of the barrel structure formed by the lower section lead tile group (1), the middle section lead tile group (2) and the upper section lead tile group (3), and a stainless steel outer casing (7) is set on the outer wall of the barrel structure. Multiple sets of pipes (5) are installed between the base plate (8) and the stainless steel plate (4); The lower section of the lead tile group (1) consists of 360° / c° groups of tiles. The lower end of each group of lead tiles is flat, and the upper end is in a step-reducing shape from the inside to the outside. The step difference is t. In the circumferential direction, the lead tiles in each group rotate a° in the same direction from the inside to the outside. The radius of the lead tiles increases from the inside to the outside. The radius increase is the tile thickness t. In the lower section of the lead tile group (1), the thickness of the lead tile in each group is t, the outer layer height is h, the height of the remaining tiles increases from the outside to the inside by t, the angle is c°, the arc length is L-1 mm, and the tile radius from the inside to the outside is r, r+t, r+2t, ...; The middle section lead tile group (2) consists of 360° / c° group tiles. The lower end of each group is stepped from the inside to the outside, and the upper end is stepped from the inside to the outside. The step difference is t. In the circumferential direction, the lead tiles in each group rotate a° in the same direction from the inside to the outside. The radius of the lead tile increases from the inside to the outside. The radius increase is the tile thickness t. The height is h1, the angle is c°, and the arc length is L-1 mm. The tile radii from the inside to the outside are r, r+t, r+2t, ... The upper section of the lead tile group (3) consists of 360° / c° groups of tiles. The upper surface of each group of lead tiles is flat, and the lower end is stepped from the inside to the outside. The step difference is t. In the circumferential direction, the lead tiles in each group rotate a° from the inside to the outside in the same direction. The radius of the lead tiles increases from the inside to the outside. The radius increase is the tile thickness t. In the upper section of the lead tile group (3), the thickness of each tile is t, the inner layer height is h2, and the height of the remaining tiles increases from the inside to the outside by t. The angle is c°, the arc length is L-1 mm, and the tile radii from the inside to the outside are r, r+t, r+2t, ...
Citation Information
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