Lightweight stack bottom shielding structure for layered stacking ship and ship

Abstract

The invention provides a light-weight layered stacking ship reactor bottom shielding structure and a ship, the light-weight layered stacking ship reactor bottom shielding structure is arranged in a double-layer bottom structure below a reactor, the shielding structure is arranged by means of a frame type double-layer bottom structure, and the shielding structure comprises a shielding body, a thin steel plate and angle steel. The reactor bottom shielding structure is a polygonal structure approximate to a circle when viewed from a plane, and the polygonal structure is arranged between the body outer contour of the reactor and the primary shielding outer contour; the reactor bottom shielding structure, the primary shielding structure and seawater below the ship body form a complete shielding system; the shielding bodies are of a plate structure and are stacked in a layered mode from bottom to top, and thin steel plates are welded on the outer sides of the shielding bodies and are welded and fixed through angle steel. According to the technical scheme, the problem that the radiation field of the adjacent area of the reactor severely exceeds the standard due to back scattering of neutrons and gamma rays at the bottom of the reactor in a nuclear power ship and a nuclear power floating platform to the adjacent area through ship bottom seawater and a double-layer bottom can be solved.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation protection, and in particular relates to a lightweight layered stacked ship bottom shielding structure and a ship. Background Art

[0002] At present, nuclear-powered ships and nuclear-powered floating platforms have a double bottom structure under the reactor compartment, which results in a large cavity between the reactor and the seawater under the hull. Neutrons and gamma rays emitted from the bottom of the reactor are strongly backscattered by the seawater at the bottom of the ship and the double bottom structure, which will cause the radiation field in the adjacent area to seriously exceed the standard, affecting the radiation safety of personnel and equipment in the adjacent area.

[0003] Therefore, how to provide a lightweight layered stacked ship reactor bottom shielding structure and ship that can solve the problem of neutrons and gamma rays at the bottom of the reactor in nuclear-powered ships and nuclear-powered floating platforms being backscattered to adjacent areas through the seawater at the bottom of the ship and the double bottom, resulting in serious excessive radiation fields in the adjacent areas of the reactor has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides a lightweight layered stacked ship reactor bottom shielding structure and a ship, which can solve the problem of serious excessive radiation field in the reactor vicinity due to backscattering of neutrons and gamma rays from the reactor bottom in nuclear-powered ships and nuclear-powered floating platforms through the seawater at the bottom of the ship and the double bottom to the adjacent area.

[0005] In one embodiment of the present invention, a lightweight layered stacked ship reactor bottom shielding structure is provided, which is arranged in a double bottom structure below the reactor. The shielding structure is arranged based on the frame-type double bottom structure and includes: a shielding body 1, a thin steel plate 2 and an angle steel 3.

[0006] The reactor bottom shielding structure is a polygonal structure close to a circle when viewed from a plane, and the polygonal structure is between the outer contour of the reactor body and the outer contour of the primary shielding. The reactor bottom shielding structure is covered with a double bottom in the height direction, forming a complete shielding system with the primary shielding and the seawater under the hull.

[0007] The shielding body 1 is a plate structure, and the shielding body 1 is stacked in layers from bottom to top. On the outer side of the shielding body 1, a thin steel plate 2 is welded and fixed by using angle steel 3.

[0008] Furthermore, the shielding body 1 includes one or more of lead, polyethylene, boron-containing polyethylene, lead-boron polyethylene, boron aluminum, heat-resistant resin-based materials and boron steel.

[0009] Furthermore, the thin steel plate 2 is formed by welding a steel plate structure in which the mass of a single plate is not greater than a set mass and the size of a single plate is not greater than a set size.

[0010] Furthermore, the set mass is 25 kg, and the set size is 300 mm×500 mm×20 mm.

[0011] Furthermore, the shielding body 1 is installed in layers and stacked from bottom to top, and gaps larger than the set distance are filled with a sheet structure with equivalent shielding performance.

[0012] Furthermore, during the installation process of the stack bottom shielding structure, a manhole structure is provided to ensure that each installation position of the stack bottom shielding structure is accessible and the integrity of the installation structure is ensured.

[0013] In yet another embodiment of the present invention, a ship is provided, the ship comprising a lightweight layered stacked ship bottom shielding structure as described in any one of the above items.

[0014] The beneficial effects brought by the present invention are as follows:

[0015] It can be seen from the above scheme that the embodiment of the present invention provides a lightweight layered stacked ship reactor bottom shielding structure and ship, which are arranged in the double bottom structure below the reactor. The shielding structure is arranged based on the frame-type double bottom structure, including: a shielding body, a thin steel plate and an angle steel. The reactor bottom shielding structure is a polygonal structure close to a circle in plane, and the polygonal structure is between the outer contour of the reactor body and the outer contour of the primary shielding; the reactor bottom shielding structure forms a complete shielding system with the primary shielding and the seawater under the hull; the shielding body is a plate structure, and the shielding body is layered and stacked from bottom to top. On the outside of the shielding body, a thin steel plate is welded and fixed with an angle steel. The technical solution of the present invention can solve the problem of serious excessive radiation field in the reactor vicinity caused by the backscattering of neutrons and gamma rays from the bottom of the reactor in nuclear-powered ships and nuclear-powered floating platforms through the seawater at the bottom of the ship and the double bottom to the adjacent area. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram showing a typical arrangement of a lightweight layered stacked ship bottom shielding structure according to an embodiment of the present invention;

[0017] Figure 2 A schematic plan view showing a lightweight layered stacked ship bottom shielding structure according to an embodiment of the present invention;

[0018] In the figure, 1 is a shielding body, 2 is a thin steel plate, and 3 is an angle steel. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] The double bottom is usually a frame structure composed of crisscross partitions, which is composed of small compartments connected by manholes. The bottom shielding needs to be installed by construction workers carrying shielding materials through the manhole after the cabin construction and inspection. The installation feasibility and convenience of the bottom shielding must be fully considered in the design of the bottom shielding.

[0021] In order to solve the problem that neutrons and gamma rays at the bottom of the reactor in nuclear-powered ships and nuclear-powered floating platforms are backscattered to the adjacent areas through the seawater at the bottom of the ship and the double bottom, resulting in serious excessive radiation fields in the adjacent areas of the reactor, a lightweight layered stacked ship reactor bottom shielding structure is proposed in an embodiment of the present invention.

[0022] like Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram showing a typical arrangement of a lightweight layered stacked ship bottom shielding structure according to an embodiment of the present invention, Figure 2 A schematic plan view of a lightweight layered stacked ship bottom shielding structure according to an embodiment of the present invention.

[0023] In the figure, a lightweight layered stacked ship reactor bottom shielding structure is arranged in the double bottom structure below the reactor. The shielding structure is arranged based on the frame-type double bottom structure and includes: a shielding body 1, a thin steel plate 2 and an angle steel 3.

[0024] The reactor bottom shielding structure is a polygonal structure close to a circle when viewed from a plane, and the polygonal structure is between the outer contour of the reactor body and the outer contour of the primary shielding. The reactor bottom shielding structure is covered with a double bottom in the height direction, forming a complete shielding system with the primary shielding and the seawater under the hull.

[0025] The shielding body 1 is a plate structure, and the shielding body 1 is stacked in layers from bottom to top. On the outer side of the shielding body 1, a thin steel plate 2 is welded and fixed by using angle steel 3.

[0026] In the embodiment of the present invention, a reactor bottom shield is arranged in the double bottom structure below the reactor, and the double bottom is fully covered in the height direction. The reactor bottom shield is arranged based on the frame-type double bottom structure, and is a polygonal structure close to a circle in plane view, and the polygonal structure is between the outer contour of the reactor body and the outer contour of the primary shield, so as to ensure that the reactor bottom shield structure, the primary shield, and the seawater below the hull form a complete shielding system, so as to avoid the weak link of the reactor shielding and cause the radiation beam leakage.

[0027] In one embodiment of the present invention, the shielding body 1 includes one or more of lead, polyethylene, boron-containing polyethylene, lead-boron polyethylene, boron aluminum, heat-resistant resin-based materials and boron steel.

[0028] It is understandable that in other implementations of the present invention, the material selection of the shielding body 1 can also be other shielding materials according to specific needs, and no specific limitation is made here.

[0029] In another embodiment of the present invention, the thin steel plate 2 is formed by welding a steel plate structure in which the mass of a single plate is not greater than a set mass and the size of a single plate is not greater than a set size.

[0030] In the embodiment of the present invention, the set mass is 25 kg, and the set size is 300 mm×500 mm×20 mm.

[0031] In another embodiment of the present invention, the shielding body 1 is installed in layers and stacked from bottom to top, and gaps larger than the set distance are filled with a thin sheet structure with equivalent shielding performance.

[0032] In yet another embodiment of the present invention, during the installation process of the stack bottom shielding structure, a manhole structure is provided to ensure that each installation position of the stack bottom shielding structure is accessible and the integrity of the installation structure is ensured.

[0033] In the embodiment of the present invention, the reactor bottom shield is arranged in the double bottom structure below the reactor, and the double bottom is fully covered in the height direction. The reactor bottom shield is arranged based on the frame-type double bottom structure, and is a polygonal structure close to a circle in plane view, and most of its area is between the outer contour of the reactor body and the outer contour of the primary shield, so as to ensure that the reactor bottom shield, the primary shield, and the seawater below the hull form a complete shielding system, avoiding the occurrence of weak shielding links and causing radiation beam leakage.

[0034] The bottom shield of the reactor consists of three parts: a shield body 1, a thin steel plate 2 and an angle steel 3. The shield body 1 can be one or more of lead, polyethylene, boron-containing polyethylene, lead-boron polyethylene, boron aluminum, heat-resistant resin-based materials, boron steel, etc. The thin steel plate 2 can be welded on site from multiple pieces.

[0035] In the embodiment of the present invention, the material used for the shielding body 1 is a plate, which is cut into several small pieces of suitable weight and size for easy handling by personnel during the installation process. The size of a single piece should be as small as possible, but it should not be split too finely. Usually, the size of each plate does not exceed 300mm×500mm×20mm, and the weight of a single plate does not exceed 25kg.

[0036] The bottom shield installation process is a layered stacking process from bottom to top. Gaps larger than 1mm should be filled with thin sheets with equivalent shielding performance. After stacking is completed, thin steel plates are welded to the outside of the shielding body and fixed with angle steel.

[0037] In the embodiment of the present invention, for the installation process of the reactor bottom shield, manholes should be reasonably arranged and the installation route should be planned to ensure that each installation position is accessible and the integrity of the installation structure is guaranteed.

[0038] In yet another embodiment of the present invention, a ship is provided, the ship comprising a lightweight layered stacked ship bottom shielding structure as described in any one of the above items.

[0039] In an embodiment of the present invention, a lightweight layered stacked ship reactor bottom shielding structure is arranged in a double bottom structure below the reactor, which can solve the problem of serious excessive radiation field in the reactor vicinity due to backscattering of neutrons and gamma rays from the reactor bottom in nuclear-powered ships and nuclear-powered floating platforms through the seawater at the bottom of the ship and the double bottom to the adjacent area.

[0040] Its outstanding advantages include: simple structure, light weight, easy assembly, strong designability, disassembly and maintenance, and can form a complete radiation shielding system with the reactor primary shielding, which can minimize the leakage of reactor radiation to the surrounding area and ensure the radiation safety of personnel and equipment in the surrounding area. The reactor bottom shielding structure of the present invention reduces weight by more than 50% compared with the form of full filling of the reactor bottom.

[0041] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A lightweight layered stacked ship reactor bottom shielding structure, arranged in a double bottom structure below the reactor, characterized in that: The shielding structure is arranged based on a frame-type double-layer bottom structure, and comprises: a shielding body (1), a thin steel plate (2) and an angle steel (3); The reactor bottom shielding structure is a polygonal structure close to a circle when viewed from a plane, and the polygonal structure is between the outer contour of the reactor body and the outer contour of the primary shielding. The reactor bottom shielding structure is covered with a double bottom in the height direction, forming a complete shielding system with the primary shielding and the seawater under the hull. The shielding body (1) is a plate structure, and the shielding body (1) is stacked in layers from bottom to top. The thin steel plate (2) is welded to the outside of the shielding body (1), and is fixed by welding using the angle steel (3).

2. A lightweight layered stacked ship bottom shielding structure according to claim 1, characterized in that: The shielding body (1) comprises one or more of lead, polyethylene, boron-containing polyethylene, lead-boron polyethylene, boron aluminum, heat-resistant resin-based material and boron steel.

3. The lightweight layered stacked ship bottom shielding structure according to claim 1 is characterized in that: The thin steel plate (2) is formed by welding a steel plate structure in which the mass of a single plate is not greater than a set mass and the size of a single plate is not greater than a set size.

4. A lightweight layered stacked ship bottom shielding structure according to claim 3, characterized in that: The set mass is 25 kg, and the set size is 300 mm×500 mm×20 mm.

5. The lightweight layered stacked ship bottom shielding structure according to claim 1 is characterized in that: The shielding body (1) is installed in layers and stacked from bottom to top during installation, and gaps with a size greater than a set distance are filled with a thin sheet structure with equivalent shielding performance.

6. The lightweight layered stacked ship bottom shielding structure according to claim 1, characterized in that: During the installation process of the stack bottom shielding structure, a manhole structure is provided to ensure that each installation position of the stack bottom shielding structure is accessible and the integrity of the installation structure is ensured.

7. A ship, characterized in that: The ship comprises a lightweight layered stacked ship bottom shielding structure as described in any one of claims 1 to 6.

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