Nuclear power station personnel airlock
A technology for personnel gates and nuclear power plants, applied in the field of nuclear power, can solve the problems of poor passing capacity, failure to meet the design standards of personnel gates, and inability to provide sufficient radiation shielding capabilities, etc., to achieve the effect of meeting the passing requirements
Active Publication Date: 2020-05-12
CHINA NUCLEAR POWER TECH RES INST CO LTD +2
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AI-Extracted Technical Summary
Problems solved by technology
However, existing personnel locks do not provide sufficient radiation shielding capability to meet the requirements of some nuclear power plants such as small offshore reactors
[0003] Patent CN201811027578.0 discloses a shielded and sealed dual-function personnel gate, and patent CN201811415067.6 discloses a nuclear shielded and sealed door. Although these two patents have realized the dual functions of shielding and sealing, these two patents adopt the integration of shielding and sealing Design, in which shielding materials are filled in the door frame and door panel of the inner sealing door of the personnel gate, resulting in a substantial increase in the thickness and weight of the inner sealing door panel. In order to mee...
Method used
[0055] The lightweight shielding material for shielding neutron rays can be a hydrogen-containing or boron-containing shielding material, including polyethylene, boron-containing polyethylene or paraffin. Alternatively, the shielding layer 32 can be made of hydrogen-containing (preferably higher hydrogen-containing) or boron-containing materials such as polyethylene, boron-containing polyethylene, or paraffin. The shielding layer 32 is preferably made of polyethylene to reduce costs.
[0068] In order to connect the personnel gate, a through hole is opened on the wall of the containment vessel, and the first end of the cylinder 1 is connected to the containment vessel through cooperation with the through hole. Further, as shown in Figures 1 and...
Abstract
The invention discloses a nuclear power station personnel airlock. The nuclear power station personnel airlock comprises a cylinder, a first end plate assembly, a second end plate assembly, a first sealing door, a shielding door and a second sealing door; the first end plate assembly is arranged at the end port of the first end of the cylinder; a first door opening is formed in the first end plateassembly; the second end plate assembly is arranged at the end port of the second end of the cylinder; a second door opening is formed in the second end plate assembly; the first sealing door is arranged on one side of the first end plate assembly and can be opened and closed on the first door opening; the shielding door is arranged on one side of the first end plate assembly and can be opened and closed on the first door opening; and the second sealing door is arranged on the second end plate assembly and can be opened and closed on the second door opening. According to the nuclear power station personnel airlock, the sealing doors and the shielding door in corresponding containment housings are independently arranged, so that the problem that the design standard of the personnel airlockcannot be met due to weight and size limitations of integrated sealing and shielding arrangement is solved, and the design standard of the personnel airlock is capable of being met when the nuclear power station personnel airlock has the functions of sealing and radiation shielding, and the nuclear power station personnel airlock is ensured to have sufficient passing capacity to meet the passingrequirement.
Application Domain
Radiation protectionPower-operated mechanism +2
Technology Topic
EngineeringNuclear power plant +3
Image
Examples
- Experimental program(1)
Example Embodiment
[0047] In order to have a clearer understanding of the technical features, objectives and effects of the present invention, the specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
[0048] Such as figure 1 , 2 As shown, the personnel gate of a nuclear power plant according to an embodiment of the present invention includes a cylinder body 1, a first end plate assembly 10, a second end plate assembly 20, a first sealing door 30, a shielding door 40 and a second sealing door 50.
[0049] In a nuclear power plant, the cylinder 1 is connected to the containment, and its internal space serves as a passage for personnel or equipment to pass in and out of the containment. The cylinder 1 may include a first end and a second end opposite to each other, wherein the first end penetrates into the containment and the second end is located outside the containment.
[0050] The first end plate assembly 10 is arranged at the port of the first end of the cylinder 1, and the first end plate assembly 10 is provided with a first door hole 100 (such as image 3 Shown), used for personnel or equipment to enter and exit the containment. The first sealed door 30 is arranged on the side of the first end plate assembly 10 facing away from the second end plate assembly 20 and is rotatable relative to the first end plate assembly 10 so as to be opened and closed on the first door hole 100. The shielding door 40 is arranged on the side of the first end plate assembly 10 facing the second end plate assembly 20 and is rotatable relative to the first end plate assembly 10 so as to be opened and closed on the first door opening 100. Both the first airtight door 30 and the screen door 40 are used to close or open the first doorway 100. When the first airtight door 30 and the screen door 40 are opened from the first doorway 100, personnel or equipment can enter and leave safely through the first doorway 100 The shell plays a role of sealing and shielding radiation when the first airtight door 30 and the shielding door 40 are closed on the first doorway 100, preventing the leakage of radioactive materials in the containment, and shielding neutron rays and gamma rays to reduce the containment The radiation dose in the outer area.
[0051] The second end plate assembly 20 is arranged at the port of the second end of the cylinder 1, and the second end plate assembly 20 is provided with a second door opening 200 for personnel or equipment to enter and exit the containment. The second sealed door 50 is disposed on the second end plate assembly 20 and can be opened and closed on the second door hole 200. When the second airtight door 50 is opened from the second doorway, personnel or equipment can enter and exit the barrel 1 through the second doorway 200; when the second airtight door 50 is closed on the second doorway 200, it mainly serves as a seal.
[0052] Among them, the cylinder body 1 is usually a cylinder, and the inner bottom surface of the cylinder body 1 is horizontally laid with a bottom plate 2 to facilitate people to walk on it. In the axial direction, the cylinder body 1 may be formed by welding a plurality of cylinder sections, which are made of steel.
[0053] The first end plate assembly 10 is fitted to the port at the first end of the cylinder 1 to close the port at the end, leaving only the first door hole 100 on the first end plate assembly 10 as an entrance and exit. In the present invention, the opening and closing of the first doorway 100 is realized by the first sealed door 30 and the screen door 40 together, which is different from the setting of opening and closing a door panel in the prior art.
[0054] Specifically, the first sealed door 30 includes a sealed door panel 31 and a shielding layer 32 compounded on the sealed door panel 31. One side of the sealed door panel 31 is mounted on a side surface of the first end plate assembly 10 through at least one hinge seat, and is rotatable relative to the first end plate assembly 10 through the hinge seat. The shielding layer 32 is provided on the side of the sealing door panel 31 facing away from the first end panel assembly 10. The first sealed door panel 31 mainly functions to seal the first door opening 100, and the arrangement of the shielding layer 32 thereon gives the first sealed door 30 a radiation shielding function. The sealed door panel 31 can be made of a metal material such as a steel material. In order not to increase the weight of the first sealed door 30 too much, the shielding layer 32 is made of a lightweight shielding material, and is mainly used to shield neutron rays.
[0055] The lightweight shielding material for shielding neutron rays can be hydrogen-containing or boron-containing shielding materials, including polyethylene, boron-containing polyethylene, or paraffin wax. Alternatively, the shielding layer 32 may be made of materials containing hydrogen (preferably higher in hydrogen content) or boron-containing materials such as polyethylene, boron-containing polyethylene or paraffin. The shielding layer 32 is preferably made of polyethylene to reduce cost.
[0056] Since the shielding layer 32 is made of a lightweight shielding material, the overall weight is small, and its thickness can be greater than that of the sealed door panel 31. The specific thickness of the shielding layer 32 can be selected according to actual radiation shielding requirements. (The thickness can be set freely and flexibly. This paragraph is also a way to explain that it can be implemented, and reservation does not affect it)
[0057] The first airtight door 30 may further include a covering layer (not shown) covering the shielding layer 32 and connected to the airtight door panel 31. The coating layer covers the shielding layer 32 therein, which can prevent the shielding layer 32 from generating fragments in an accident. The cladding layer can be made of the same material as the sealing door panel, such as steel.
[0058] The screen door 40 is located on the other side of the first doorway 100 opposite to the first airtight door 30, and is mainly used for shielding gamma rays. The screen door 40 is mounted on a side surface of the first end plate assembly 10 through at least one hinged seat, and is rotatable relative to the first end plate assembly 10 through the hinged seat. The screen door 40 may include a steel shell and a gamma ray shielding layer filled in the steel shell. The γ-ray shielding layer is made of at least one of lead, steel, and tungsten metal, or an alloy of the foregoing metals, or a composite material of the foregoing metals. Considering the shielding effect and cost, the gamma ray shielding layer is preferably lead.
[0059] In order to prevent the weight of the shield door 40 from being too heavy and increase the difficulty of opening and closing, the thickness of the shield door 40 does not need to be large, and its thickness is smaller than the thickness of the first sealed door 30, and can also be smaller than the thickness of the shielding layer 32. Of course, the thickness relationship between the shielding door 40 and the first sealing door 30 and the shielding layer 32 is not limited, nor is it limited to the aforementioned thickness relationship.
[0060] Such as image 3 As shown, in order to improve the radiation shielding effect of the uncovered area of the screen door 40, the first end plate assembly 10 may include a first door frame 11 and a second door frame 12 arranged opposite to each other, which are sequentially arranged on the first door frame 11 and the second door frame. 12 between the first shield filling layer 13 and the second shield filling layer 14. The first doorway 100 is provided through the first door frame 11 and the second door frame 12.
[0061] The first sealed door 30 is arranged on the side of the first door frame 11 facing away from the second door frame 12, and the screen door 40 is arranged on the side of the second door frame 12 facing away from the first door frame 11.
[0062] The first shielding filling layer 13 is used to shield neutron rays, and may be made of lightweight materials with hydrogen atoms such as polyethylene, lead-boron polyethylene, or paraffin wax. The second shielding filling layer 14 is used to shield γ rays, and may be made of at least one of metals such as lead, steel, tungsten, or an alloy of the foregoing metals, or a composite material of the foregoing metals. In this embodiment, the thickness of the first shielding and filling layer 13 is greater than the thickness of the second shielding and filling layer 14.
[0063] Further, the first end plate assembly 10 further includes a partition 15 arranged between the first door frame 11 and the second door frame 12; the partition 15 divides the space between the first door frame 11 and the second door frame 12 into a plurality of sections . The partition 15 may include a frame 151 corresponding to the shape of the first door opening 100 and a plurality of partitions 152 connected to the frame 151 at intervals.
[0064] Corresponding to multiple intervals, the first shielding and filling layer 13 includes a plurality of first filling blocks 131, which are arranged one by one in the interval; the second shielding and filling layer 14 includes a plurality of second filling blocks 141, which are arranged one by one in the interval . According to the different shapes of each interval, the shapes between the first filling blocks 131 are also different, and the shapes between the second filling blocks 141 are also different. Preferably, the thickness of the plurality of first filling blocks 131 is uniform, and the thickness of the plurality of second filling blocks 141 is uniform.
[0065] The above-mentioned partition arrangement in the first end plate assembly 10 not only facilitates the filling arrangement of the first shield filling layer 13 and the second shield filling layer 14, but also improves the structural strength of the first end plate assembly 10.
[0066] In addition, the entire outer peripheral side surface of the first end plate assembly 10 is sealed and attached to the inner wall surface of the cylinder 1, and the outer peripheries of the first shield filling layer 13 and the second shield filling layer 14 are covered by the inner wall surface of the cylinder 1.
[0067] The second end plate assembly 20 may include an end plate, and the second door hole 200 penetrates the end plate to form a door frame structure. The shape of the end plate is set corresponding to the second end port of the cylinder 1, and the outer peripheral side surface of the end plate and the inner wall surface of the cylinder 1 are arranged in a sealed fit. The second sealed door 50 includes a sealed door panel, which is installed on a side surface of the second end plate assembly 20 through at least one hinged seat. The sealed door panel can be set with reference to the sealed door panel 31 of the first sealed door 30. Both the second end plate assembly 20 and the second sealing door 50 can be made of steel materials. The second end plate assembly 20 and the second sealing door 50 can be implemented by the prior art.
[0068] In order to connect the personnel gate, a through hole is opened on the wall of the containment, and the first end of the cylinder 1 is connected to the containment by matching with the through hole. Further, as figure 1 , 2 As shown, the personnel gate of the nuclear power plant of the present invention also includes a shielding cylinder 60 sleeved on the outer circumference of the first end of the cylinder body 1. The shielding cylinder 60 can be joined with the shielding layer in the wall of the containment to make the shielding layer in the containment It is closed to form a whole, and there is no break due to the opening of the through hole, ensuring the radiation shielding performance.
[0069] The shielding cylinder 60 includes a shielding inner cylinder layer 61 and a shielding outer cylinder layer 62 sequentially sheathed on the outer circumference of the first end of the cylinder 1. The shielding outer cylinder layer 62 is made of neutron ray shielding material, which is mainly used to shield neutron rays; the neutron ray shielding material includes polyethylene, boron-containing polyethylene or paraffin wax and other hydrogen-containing (preferably higher hydrogen content) or The material of boron, so that the shielding outer cylinder layer 62 can be made of hydrogen or boron-containing materials such as polyethylene, boron-containing polyethylene, or paraffin wax. The shielding inner cylinder layer 61 is made of a gamma ray shielding material and is used to shield gamma rays. The shielding inner cylinder layer 61 may be made of at least one of lead, steel, tungsten metal, or an alloy or composite material of the foregoing metals.
[0070] Understandably, the personnel gate of the present invention can also be joined with the shielding layer in the wall surface of the containment via the first end plate assembly 10, and the shielding cylinder 60 is not required.
[0071] In order to drive the screen door 40 to open and close on the first doorway 100, the personnel gate of the nuclear power plant of the present invention further includes a driving mechanism 70 arranged in the cylinder 1. The driving mechanism 70 is connected to and drives the screen door 40 to rotate relative to the first end plate assembly 10. , Opening and closing on the first hole 100.
[0072] The number of door pages of the screen door 40 can be set as required. Such as figure 1 , 2 As shown in 4, in this embodiment, the screen door 40 includes a first door leaf 41 and a second door leaf 42 (left and right) that are split apart. Both the first door leaf 41 and the second door leaf 42 include a steel shell and a gamma ray shielding layer filled in the steel shell.
[0073] In order to reduce radiation leakage from the butt joint of the door leaf, the butt end surfaces of the first door leaf 41 and the second door leaf 42 may be non-planar, so that after the butt ends of the two are connected, the gap formed is not a straight line. Alternatively, the abutting end surfaces of the first door leaf 41 and the second door leaf 42 may be Z-shaped or S-shaped in cross section, and the correspondingly formed butting gap may be non-linear such as Z-shaped or S-shaped.
[0074] Such as Figure 4 As shown, corresponding to the two door pages of the screen door 40, the drive mechanism 70 may include a first commutator 71, a first screw 72 provided corresponding to the first door leaf 41, a first sliding block 73 and a first connecting rod 74, The second screw 75, the second sliding block 76 and the second connecting rod 77, the second commutator 78, the universal joint 710 and the third commutator 79 are provided corresponding to the second door leaf 42.
[0075] Among them, the first commutator 71 is connected to the transmission box 3 and is driven by the transmission box 3 to act. The transmission box 3 can be embedded on the cylinder 1. According to the opening and closing direction of the first door leaf 41, the first screw 72 can be arranged perpendicularly to the inner wall surface of the cylinder 1 relative to the first door leaf 41. One end of the first screw 72 is connected with the transmission shaft of the first commutator 71 for transmission. The second commutator 78 corresponds to the other end of the first screw 72, and its transmission shaft is connected to the other end of the first screw 72. The first sliding block 73 is fitted on the first screw 72 and can move back and forth along the axial direction of the first screw 72; the two ends of the first connecting rod 74 are respectively hinged on the first sliding block 73 and the first door leaf 41, when When the first sliding block 73 moves back and forth on the first screw 72, the first door leaf 41 is driven to rotate relative to the first end plate assembly 10 through the first connecting rod 74.
[0076] According to the opening and closing direction of the second door leaf 42, the second screw 75 can be arranged perpendicular to the inner wall surface of the cylinder 1 relative to the second door leaf 42. The second sliding block 76 is fitted on the second screw 75 and can move back and forth along the axial direction of the second screw 75. Both ends of the second connecting rod 77 are hinged on the second sliding block 76 and the second door leaf 42 respectively. One end of the second screw 75 is connected to the transmission shaft of the third commutator 79, and the third commutator 79 is connected to the second commutator 78 through a universal coupling 710, so as to realize the connection from the first commutator 71 to the second commutator 78 Transmission from a screw 72, a second commutator 78, a third commutator 79 to a second screw 75.
[0077] The driving mechanism 70 is driven by the transmission box 3, and the first screw 72 rotates with the transmission shaft of the first commutator 71 to drive the first slider 73 to move back and forth along the axial direction of the first screw 72 while passing through the second commutator 78. The universal joint 710 and the third commutator 79 drive the second screw 75 to rotate simultaneously, and drive the second slider 76 to move back and forth along the axial direction of the second screw 75, so that the first door leaf 41 and the second The door leaf 42 is opened and closed on the first doorway 100.
[0078] Specifically, the driving mechanism 70 further includes a first support and a second support. The first screw 72 is rotatably pierced on the first support, and the first screw 72 is provided in the cylinder 1 through the support of the first support. The second screw 75 is rotatably pierced on the second support, and the second screw 75 is provided in the cylinder 1 through the support of the second support. The first support seat may include two seat bodies 711 arranged opposite to each other. The opposite ends of the first screw 72 are respectively penetrated on the two seat bodies 711; at least one guide rail 712 and The first sliding block 73 cooperates to guide the movement of the first sliding block 73. In the same way, the structure of the second support can be the same as the first support.
[0079] Part or all of the driving mechanism 70 can be arranged under the bottom plate 2 in the cylinder 1 to realize concealment without affecting the passage of personnel and equipment.
[0080] In other embodiments, the screen door 40 may include a door leaf. Correspondingly, the driving mechanism 70 may include a commutator connected to the transmission box and arranged in the cylinder, a screw connected to the transmission shaft of the commutator, a sliding block that is inserted on the screw and can move back and forth along the axial direction of the screw, The two ends are respectively hinged on the sliding block and the connecting rod on the door leaf; the screw rotates with the drive shaft of the commutator, driving the sliding block to move back and forth along the screw axis, driving the connecting rod to move along the screw axis, closing the door leaf on the first Open on or from the doorway.
[0081] Further, the personnel gate of the nuclear power plant of the present invention also includes a first driving assembly 80 that connects and drives the first sealed door 30 to rotate relative to the first end plate assembly 10, and connects and drives the second sealed door 50 to rotate relative to the second end plate assembly 20 The second drive assembly 90.
[0082] In the present invention, both the first drive assembly 80 and the second drive assembly 90 can be implemented by using existing technologies.
[0083] For example, such as figure 2 As shown, the first driving assembly 80 includes a first rotating shaft 81 and at least one first connecting rod 82. The first rotating shaft 81 is arranged vertically, is arranged on the first end plate assembly 10 on one side of the first sealed door 30 and is rotatable relative to the first end plate assembly 10. The first connecting rod 82 is disposed on the first sealed door 30 and is relatively fixed to the first sealed door 30, and one end of the first connecting rod 82 is connected to the first rotating shaft 81. The rotation of the first rotating shaft 81 drives the first sealed door 30 to rotate relative to the first end plate assembly 20 through the first connecting rod 82, thereby closing or opening the first door hole 100.
[0084] The second driving assembly 90 includes a second rotating shaft 91 and at least one second connecting rod 92. The second rotating shaft 91 is vertically arranged, and is arranged on the second end plate assembly 20 on one side of the second sealed door 50 and is rotatable relative to the second end plate assembly 20. The second connecting rod 92 is disposed on the second sealed door 50 and is relatively fixed to the second sealed door 50, and one end of the second connecting rod 92 is connected to the second rotating shaft 91. The rotation of the second rotating shaft 91 drives the second sealed door 50 to rotate relative to the second end plate assembly 20 through the second connection 92, thereby closing or opening the second door opening 200.
[0085] In addition, the first drive assembly 80 and the second drive assembly 90 further include a hinge mechanism (not shown) connecting the first shaft 81 and the second shaft 91, respectively. The hinge mechanism is respectively connected with the transmission box, and the driving force is transmitted to the first shaft 81 and the second shaft 91 through the hinge structure through the transmission case, and the first shaft 81 and the second shaft 91 are driven to rotate.
[0086] In practical applications, the opening and closing sequence of the first sealed door 30 and the screen door 40 in the personnel gate of the nuclear power plant of the present invention is as follows:
[0087] For reactors with large variable loads (such as small nuclear power plants navigating at sea), the first sealed door 30 and the screen door 40 are opened sequentially, which can effectively reduce the power of the transmission system.
[0088] For a stack type that does not bear a large load (such as a small land-based stack), the first sealed door 30 and the screen door 40 can be opened simultaneously.
[0089] The above are only the embodiments of the present invention, and do not limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the description and drawings of the present invention, or directly or indirectly applied to other related technologies In the same way, all fields are included in the scope of patent protection of the present invention.
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