A kind of nuclear power unit pressure regulator inter-inspection shielding structure

Abstract

The utility model is suitable for nuclear radiation protection field, disclose a kind of flaw detection shielding structure between nuclear power unit voltage stabilizer, comprising: upper shielding assembly and lower shielding assembly;The upper shielding assembly includes first shielding unit and fixed unit, the fixed unit is set on the first shielding unit upper portion and left and right sides, the first shielding unit is installed on the working room opening upper portion by the fixed unit;The lower shielding assembly includes second shielding unit and frame, the frame is set on the working room opening lower portion, and the second shielding unit includes several shielding modules. By setting first shielding unit on the working room opening upper portion and blocking the radiation of upper portion, setting second shielding unit on the working room opening lower portion and blocking the radiation of lower portion, the area of mutual overlapping part of first shielding unit and second shielding unit is used to completely cover shielding working room opening, and completely block radiation.

Description

Technical Field

[0001] This utility model relates to the field of nuclear radiation protection, and in particular to a flaw detection shielding structure between the voltage regulators of a nuclear power unit. Background Technology

[0002] During the overhaul of the HPR (Hualong One) nuclear power unit, active radiographic testing (ART) is required at the welded joints of the pressurizer and some pipelines to check the safety and reliability of the welds. Therefore, an ART workshop was designed around the nuclear power unit. This workshop needs one side facing the pressurizer and some pipelines, and the other side facing the nuclear power unit. Due to nuclear safety regulations, the side facing the nuclear power unit needs to maintain a certain opening to prevent pressure relief channels in the event of a nuclear accident. However, the high intensity of the radioactive source used for ART could affect the radioactivity levels of other work areas during the ART process. This would force personnel to carry out other work while ART is being conducted, significantly extending the overhaul period. Furthermore, the ART workshop lacks a shielding device or structure that complies with nuclear safety regulations. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a flaw detection shielding structure between the voltage regulators of a nuclear power unit.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: A flaw detection shielding structure is constructed between the voltage regulators of a nuclear power unit, comprising: an upper shielding assembly and a lower shielding assembly; the upper shielding assembly includes a first shielding unit and a fixing unit, the fixing unit being disposed on the upper part and left and right sides of the first shielding unit, and the first shielding unit being installed on the upper part of the work area opening via the fixing unit; the lower shielding assembly includes a second shielding unit and a frame, the frame being disposed on the lower part of the work area opening, the second shielding unit including a plurality of shielding modules, the plurality of shielding modules being laid on the frame; wherein, the first shielding unit and the second shielding unit are not connected to each other, and the shielding areas of the first shielding unit and the second shielding unit partially overlap and completely cover the opening.

[0005] In some embodiments, the first shielding unit includes an upper shielding body and a lower shielding body.

[0006] In some embodiments, the shielding module includes a shielding plate made of shielding material and an outer packaging layer. When the shielding module is installed on the frame, the shielding plates overlap each other, and there are no gaps between the shielding plates.

[0007] In some embodiments, the second shielding unit is rectangular in shape, and has upwardly extending branches on both sides of the second shielding unit, the branches extending to the top of the work area.

[0008] In some embodiments, the fixing unit includes several fixing seats and several fixing members. The fixing seats are 90-degree angle bracket structures, and the fixing members pass through the fixing seats and are fixed in the wall.

[0009] In some embodiments, the upper part and both sides of the upper shield are connected to the fixed base and fixed to the upper part of the work area by fasteners, and the lower shield is disposed below the upper shield, with both sides of the lower shield connected to the fixed base.

[0010] In some embodiments, the total width of the workspace is greater than the width of the first shielding unit, the width of the first shielding unit is greater than the width of the workspace opening, the height of the workspace is greater than the height of the top of the first shielding unit, and the height of the top of the first shielding unit is greater than the height of the workspace opening.

[0011] In some embodiments, the first shielding unit is provided with a protrusion, the protrusion is hollow inside, and the protrusion opens toward the side of the first shielding unit.

[0012] In some embodiments, the radiation shielding material for the first shielding unit and the second shielding unit is lead plate.

[0013] In some embodiments, the first shielding unit is mounted on the exterior of the work area on the side of the work area closest to the nuclear power unit.

[0014] The present invention provides a flaw detection shielding structure for the pressurizer compartment of a nuclear power unit, which offers the following advantages: By installing a first shielding unit above the working chamber opening to block upper radiation and a second shielding unit below the opening to block lower radiation, the overlapping area of ​​the first and second shielding units completely covers and shields the working chamber opening, effectively blocking radiation. Furthermore, the first and second shielding units are not connected to each other, leaving a large gap to serve as a pressure relief outlet in case of a nuclear power unit accident, thus complying with nuclear power safety regulations. Additionally, the upper and lower shielding components have simple structures and are quick to install, significantly reducing construction time and improving the efficiency of nuclear power unit overhauls. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0016] Figure 1 This is an overall diagram of a flaw detection shielding structure between voltage regulators in a nuclear power unit, according to one embodiment of this utility model.

[0017] Figure 2 This is a front view of a flaw detection shielding structure between voltage regulators in a nuclear power unit, according to one embodiment of this utility model.

[0018] Figure 3 yes Figure 2 Sectional view at EE;

[0019] Figure 4 This is a structural diagram of the upper shielding component of a nuclear power unit voltage regulator inter-flaw detection shielding structure according to one embodiment of the present invention;

[0020] Figure 5 This is a structural diagram of the lower shielding component of a nuclear power unit voltage regulator inter-flaw detection shielding structure according to one embodiment of the present invention;

[0021] Figure 6 This is a partially enlarged view of the shielding component of a nuclear power unit voltage regulator inter-station flaw detection shielding structure in one embodiment of this utility model.

[0022] Figure Labels

[0023] 100. Work area; 200. Upper shielding assembly; 210. Upper shielding body; 220. Lower shielding body; 230. Fixing unit; 231. Fixing base; 232. Fixing component; 240. Protrusion; 300. Lower shielding assembly; 310. Frame; 320. Shielding module; Detailed Implementation

[0024] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "upper," "inner," and "outer" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0025] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0026] Figures 1 to 2 Some preferred embodiments of the flaw detection shielding structure between the pressurizers of a nuclear power unit are shown. This flaw detection shielding structure between the pressurizers of a nuclear power unit can be used for radiation shielding inside a nuclear power plant.

[0027] Figures 1 to 6 This invention illustrates a flaw detection shielding structure between voltage regulators in a nuclear power plant, which can be used for radiation shielding within a nuclear power plant. The structure includes an upper shielding component 200 and a lower shielding component 300. The upper shielding component 200 includes a first shielding unit and a fixing unit 230. The fixing unit 230 is disposed above and on the left and right sides of the first shielding unit, and the first shielding unit is installed above the opening of the work area 100 via the fixing unit 230. The lower shielding component 300 includes a second shielding unit and a frame 310. The frame 310 is disposed below the opening of the work area 100. The second shielding unit includes several shielding modules 320, which are laid on the frame 310. The first and second shielding units are not connected to each other, and the shielding areas of the first and second shielding units partially overlap, completely covering the opening. By installing a first shielding unit above the opening of the work area 100 to block upper radiation and a second shielding unit below the opening to block lower radiation, the overlapping area of ​​the first and second shielding units completely covers and shields the opening of the work area 100, thus completely blocking radiation. Furthermore, the first and second shielding units are not connected to each other, leaving a large gap to serve as a pressure relief vent in the event of a nuclear power unit accident, complying with nuclear power safety regulations. Moreover, the upper shielding assembly 200 and lower shielding assembly 300 have simple structures and are quick to install, greatly reducing construction time and improving the efficiency of nuclear power unit overhauls.

[0028] Understandably, since the upper shielding component 200 and the lower shielding component 300 need to shield against strong radiation, they require a thicker radiation shielding layer for protection. Therefore, they are divided into the upper shielding component 200 and the lower shielding component 300 to reduce weight. The lower shielding component 300 is divided into several shielding modules 320 for easy installation.

[0029] In one specific embodiment, the weight of a single shielding module 320 is less than 30kg, which is beneficial for users to carry and install without the need for other handling equipment.

[0030] In one specific embodiment, the shielding area of ​​the lower shielding component 300 is greater than or equal to the shielding area of ​​the upper shielding component 200.

[0031] In one specific embodiment, the overlapping area of ​​the lower shielding component 300 and the upper shielding component 200 is greater than or equal to 10% of the total opening area.

[0032] In one specific embodiment, the distance between the lower shielding component 300 and the upper shielding component 200 needs to be designed based on the actual shielding area and the area of ​​overlapping shielding.

[0033] Figure 1 , Figure 2 and Figure 4 The first shielding unit is shown to include an upper shielding body 210 and a lower shielding body 220 in one embodiment. Because a single shielding unit is too heavy to install, it needs to be installed in two parts to reduce the difficulty of construction.

[0034] Figure 5 and Figure 6 The shielding module 320, as shown in one embodiment, may include a shielding plate made of shielding material and an outer packaging layer. When the shielding module 320 is mounted on the frame 310, the shielding plates overlap each other without gaps. The shielding plates overlap at their edges, with one layer overlapping the edge of another to avoid gaps between the shielding plates, which would allow radiation to leak out through these gaps.

[0035] Figure 5 and Figure 6 The second shielding unit, as shown in one embodiment, may be rectangular in shape, with upwardly extending branches 321 on both sides extending to the top of the work area 100. Because the first shielding unit is located at the opening, the connection between the first shielding unit and the wall is the thinnest, making it prone to radiation leakage due to insufficient shielding thickness. Therefore, the second shielding unit has upwardly extending branches 321 on both sides, which increase the blocking area, shielding the first shielding unit at the wall and increasing the shielding thickness.

[0036] Figure 4 The fixing unit 230 is shown in one embodiment to include a plurality of fixing seats 231 and a plurality of fixing members 232. The fixing seats 231 are 90-degree angle bracket structures, and the fixing members 232 pass through the fixing seats 231 and are fixed in the wall.

[0037] In one specific embodiment, the fixing base 231 can also be in other forms, such as a slot.

[0038] Figure 1 , Figure 2 and Figure 4 The clamping unit 300 is shown in one embodiment as including an upper shield 210 whose upper part and sides are respectively connected to the fixing base 231 and fixed to the upper part of the work chamber 100 by fixing members 232, and a lower shield 220 disposed below the upper shield 210, with both sides of the lower shield 220 connected to the fixing base.

[0039] Figures 1 to 2 The diagram shows that in one embodiment, the workspace 100 may include a workspace 100 with a total width greater than the width of a first shielding unit, a first shielding unit with a width greater than the opening width of the workspace 100, a workspace 100 with a height greater than the height of the top of the first shielding unit, and a first shielding unit with a height greater than the opening height of the workspace 100. The first shielding unit can completely cover the area above the opening.

[0040] Figure 4 The first shielding unit is shown in one embodiment to include a protrusion 240 on the first shielding unit. The protrusion 240 is hollow inside and has an opening facing the first shielding unit.

[0041] Figure 1 and Figure 2 The illustration shows a first shielding unit and a second shielding unit. In one embodiment, the first shielding unit and the second shielding unit may be made of lead plate as the radiation shielding material. Lead is currently the most commonly used material for shielding radiation and can effectively shield radiation.

[0042] In one specific embodiment, the first and second shielding units are made of lead plates, the thickness of which is determined according to actual design requirements and nuclear power safety regulations.

[0043] In one specific embodiment, the lead plate thickness of the shielding module 320 is 10-20mm.

[0044] In the embodiments of this application, the thickness of the shielding module 320 is preferably 13 mm.

[0045] Figure 1The clamping unit 300 is shown in one embodiment to include a first shielding unit mounted on the exterior 100 of the work area 100 near the nuclear power unit. Installation on the exterior 100 of the work area facilitates the handling and construction of the first unit, reducing construction time and improving efficiency.

[0046] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A flaw detection shielding structure between voltage regulators in a nuclear power unit, characterized in that, include: Upper shielding assembly (200) and lower shielding assembly (300); The upper shielding assembly (200) includes a first shielding unit and a fixing unit (230). The fixing unit (230) is disposed on the upper part and the left and right sides of the first shielding unit. The first shielding unit is installed on the upper part of the opening of the work room (100) through the fixing unit (230). The lower shielding assembly (300) includes a second shielding unit and a frame (310). The frame (310) is disposed below the opening of the workroom (100). The second shielding unit includes a plurality of shielding modules (320), and the plurality of shielding modules (320) are laid on the frame (310). The first shielding unit and the second shielding unit are not connected to each other. The shielding areas of the first shielding unit and the second shielding unit partially overlap and completely cover the opening.

2. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 1, characterized in that, The first shielding unit includes an upper shield (210) and a lower shield (220).

3. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 1, characterized in that, The shielding module (320) includes a shielding plate made of shielding material and an outer packaging layer. When the shielding module (320) is installed on the frame (310), the shielding plates overlap each other and there are no gaps between the shielding plates.

4. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 1, characterized in that, The second shielding unit is rectangular in shape, and has upward-extending branches (321) on both sides, which extend to the top of the work area (100).

5. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 2, characterized in that, The fixing unit (230) includes several fixing seats (231) and several fixing members (232). The fixing seats (231) are 90-degree angle bracket structures, and the fixing members (232) pass through the fixing seats (231) and are fixed in the wall.

6. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 5, characterized in that, The upper shield (210) is connected to the fixed base (231) on its upper part and both sides and is fixed to the upper part of the work room (100) by the fastener (232). The lower shield (220) is located below the upper shield (210) and is connected to the fixed base on both sides.

7. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 1, characterized in that, The total width of the work area (100) is greater than the width of the first shielding unit, the width of the first shielding unit is greater than the opening width of the work area (100), the height of the work area (100) is greater than the height of the top of the first shielding unit, and the height of the top of the first shielding unit is higher than the opening height of the work area (100).

8. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 1, characterized in that, The first shielding unit is provided with a protrusion (240), the protrusion (240) is hollow inside, and the protrusion (240) opens towards the first shielding unit.

9. The flaw detection shielding structure between voltage regulators of a nuclear power unit according to claim 1, characterized in that, The radiation protection material for both the first and second shielding units is lead plate.

10. The flaw detection shielding structure between voltage regulators in a nuclear power unit according to claim 1, characterized in that, The first shielding unit is installed in the external working room (100) on the side of the working room (100) closest to the nuclear power unit.

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