High-safety casting molding ship reactor bottom shielding structure and ship

Abstract

The invention provides a high-safety casting molding ship reactor bottom shielding structure and a ship, the reactor bottom shielding structure is arranged in a double-layer bottom structure below a reactor, and the reactor bottom shielding structure comprises a template, a shielding body, a sprue gate and an exhaust port. The template is a steel plate and is connected to a double-layer bottom structure below a reactor, a sprue gate and an exhaust port are reserved in the template, and a cavity enclosed by the template and the double-layer bottom structure is a container required for pouring a shielding material; the shielding body is a cured material of a shielding material, and the shielding material is injected into a container required for pouring the shielding material through the pouring port and the exhaust port. According to the technical scheme, the reactor bottom shield is arranged in the double-layer bottom, scattering of neutrons and gamma rays at the bottom of the reactor to an adjacent area is weakened to the maximum extent, and radiation safety of personnel and equipment in the adjacent area is protected. Meanwhile, the radiation level of the hull plate below the reactor is reduced, the hull plate is protected against radiation paint, and the hull structure is prevented from being corroded beyond design.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation protection, and in particular relates to a high-safety casting-molded marine reactor 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 and the double bottom structure, which will cause the radiation field in the adjacent compartments to seriously exceed the standard, affecting the radiation safety of personnel and equipment in the adjacent compartments.

[0003] The dose level that the available radiation-resistant paint for the hull plating below the reactor can withstand is usually low, about 3E3Gy / a, which is much smaller than the dose value at the hull plating location.

[0004] Therefore, how to provide a highly safe cast-molded marine reactor bottom shielding structure and ship, set up a reactor bottom shield in the double bottom, minimize the scattering of neutrons and gamma rays from the bottom of the reactor to the adjacent areas, and protect the radiation safety of personnel and equipment in the adjacent areas has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The embodiment of the present invention provides a high-safety cast-molded marine reactor bottom shielding structure and a ship, wherein a reactor bottom shield is arranged in a double bottom to minimize the scattering of neutrons and gamma rays from the reactor bottom to adjacent areas, thereby protecting the radiation safety of personnel and equipment in adjacent areas.

[0006] In one embodiment of the present invention, a high-safety cast-molded marine reactor bottom shielding structure is provided, which is arranged in a double bottom structure below the reactor. The shielding structure is an integrated cast-molded structure, including: a template 1, a shielding body 2, a pouring port 3 and an exhaust port 4.

[0007] The template 1 is a steel plate connected to the double bottom structure below the reactor. The template 1 is reserved with a pouring port 3 and an exhaust port 4. The cavity enclosed by the template 1 and the double bottom structure is a container required for pouring shielding materials.

[0008] The shielding body 2 is a solidified product of the shielding material. The shielding material is injected into a container required for casting the shielding material through a pouring port 3 and an exhaust port 4 .

[0009] Furthermore, the template 1 is formed by welding a group of block templates, and the template 1 is connected to the double-layer bottom structure by bolting or welding.

[0010] Furthermore, the area enclosed by the template 1 does not exceed the outer contour area of ​​the primary shielding, and is not smaller than the body projection area of ​​the reactor.

[0011] Furthermore, the casting area filled with the shielding material is ensured to prevent leakage of the shielding material by at least caulking and welding.

[0012] Furthermore, the shielding body 2 is a solidified product formed by curing the shielding material including at least shielding putty and concrete.

[0013] Furthermore, the shielding material is pressurized and injected into the casting area through the casting port 3 and the exhaust port 4, and the casting port 3 and the exhaust port 4 are sealed after the casting area is filled.

[0014] Furthermore, the reactor bottom shield has an outer shape of a cylindrical entity, which is arranged in the double bottom structure below the reactor and covers the entire double bottom in the height direction.

[0015] In yet another embodiment of the present invention, a ship is provided, the ship comprising a high-safety cast-molded ship bottom shielding structure as described in any one of the above items.

[0016] The beneficial effects brought by the present invention are as follows:

[0017] It can be seen from the above scheme that the embodiment of the present invention provides a highly safe cast-molded ship reactor bottom shielding structure and ship. The reactor bottom shielding structure is arranged in the double bottom structure below the reactor, and includes: a template, a shielding body, a pouring port and an exhaust port. The template is a steel plate connected to the double bottom structure below the reactor. The template reserves a pouring port and an exhaust port. The cavity surrounded by the template and the double bottom structure is the container required for pouring the shielding material; the shielding body is a solidified product of the shielding material, and the shielding material is injected into the container required for pouring the shielding material through the pouring port and the exhaust port. The technical scheme of the present invention sets a reactor bottom shield in the double bottom to minimize the scattering of neutrons and gamma rays from the bottom of the reactor to the adjacent area, and protect the radiation safety of personnel and equipment in the adjacent area. At the same time, the radiation level of the hull outer plate below the reactor is reduced, the radiation-resistant paint of the hull outer plate is protected, and the hull structure is prevented from over-design corrosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram showing a typical arrangement scenario of a high-safety cast-molded ship reactor bottom shielding structure according to an embodiment of the present invention;

[0019] Figure 2 A schematic plan view showing a high-safety cast-molded ship reactor bottom shielding structure according to an embodiment of the present invention;

[0020] In the figure, 1 is a template, 2 is a shielding body, 3 is a pouring port, and 4 is an exhaust port. DETAILED DESCRIPTION

[0021] 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.

[0022] At present, the double bottom is usually a frame structure composed of crisscross partitions, which is composed of small squares connected by manholes. The bottom shielding needs to be installed by construction workers carrying shielding materials through the manhole into the double bottom after the cabin construction and inspection. The working space is small, the construction workload is large, and the construction period is long. How to ensure the shielding effect, improve construction efficiency, and reduce construction workload is a long-standing difficulty in engineering and design.

[0023] In order to 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 cabins through the seawater and double bottom structure at the bottom of the ship, resulting in serious excessive radiation fields in cabins adjacent to the reactor, and the problem of insufficient radiation dose resistance of the hull outer plate paint, a highly safe cast-molded ship reactor bottom shielding structure was proposed.

[0024] like Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram of a typical arrangement scenario of a high-safety cast-molded ship reactor bottom shielding structure according to an embodiment of the present invention, Figure 2 A schematic plan view of a high-safety cast-molded ship reactor bottom shielding structure according to an embodiment of the present invention.

[0025] In the figure, a high-safety cast-molded marine reactor bottom shielding structure is arranged in a double-layer bottom structure below the reactor. The shielding structure is an integrated cast-molded structure, including: a template 1, a shielding body 2, a pouring port 3 and an exhaust port 4.

[0026] The template 1 is a steel plate connected to the double bottom structure below the reactor. The template 1 is reserved with a pouring port 3 and an exhaust port 4. The cavity enclosed by the template 1 and the double bottom structure is a container required for pouring shielding materials.

[0027] The shielding body 2 is a solidified product of the shielding material. The shielding material is injected into a container required for casting the shielding material through a pouring port 3 and an exhaust port 4 .

[0028] In the embodiment of the present invention, a lightweight cast-molded ship reactor bottom shielding structure is arranged in a double bottom structure below the reactor, which has a simple structure, convenient construction, short construction period and good safety. The reactor bottom shielding can form a complete radiation shielding system together with the reactor primary shielding, which can minimize the leakage of reactor radiation to the surrounding area, ensure the radiation safety of personnel and equipment in the surrounding area, and at the same time reduce the radiation level of the hull outer plate below the reactor, protect the radiation-resistant paint of the hull outer plate, and avoid corrosion beyond the design of the hull structure.

[0029] According to the technical solution of the present invention, the bottom shielding structure of the pile does not need to carry a large amount of shielding materials, but only needs to be poured through the pouring pipe, and the construction workload is small. It is preliminarily estimated that the construction period is reduced by about 80% compared with the form of laying plates.

[0030] In one embodiment of the present invention, the template 1 is formed by welding a group of block templates, and the template 1 is connected to the double-layer bottom structure by bolting or welding.

[0031] The area enclosed by the template 1 does not exceed the outer contour area shielded once, and is not smaller than the body projection area of ​​the reactor.

[0032] In the embodiment of the present invention, the template 1 is a steel plate structure, which can be welded from multiple steel plates and fixed to the double bottom structure of the reactor by bolt connection or welding. The cavity enclosed by the template 1 and the double bottom structure is the container required for the subsequent pouring of shielding materials. The area enclosed by the template 1 is usually no larger than the outer contour area of ​​the primary shielding, but shall not be smaller than the projected area of ​​the reactor body.

[0033] In one embodiment of the present invention, the casting area filled with the shielding material is ensured to prevent leakage of the shielding material by at least caulking and welding.

[0034] In one embodiment of the present invention, the shielding body 2 is a solidified product formed by curing a shielding material including at least shielding putty and concrete.

[0035] In one embodiment of the present invention, the shielding material is pressurized and injected into the casting area through the casting port 3 and the exhaust port 4, and the casting port 3 and the exhaust port 4 are blocked after the casting area is filled.

[0036] In the embodiment of the present invention, the shielding body 1 is a solidified material formed by curing shielding putty, concrete, etc. When the bottom shielding is ready for construction, a manhole is reasonably opened and the installation route is planned to ensure that each installation position is accessible. The pouring pipe is pulled in sequence from the inside to the outside to connect the pouring port and the exhaust port, and the shielding material is pressurized to ensure the integrity of the formed shielding body.

[0037] In one embodiment of the present invention, the reactor bottom shield is in the shape of a cylindrical entity, which is arranged in the double bottom structure below the reactor and covers the entire double bottom in the height direction.

[0038] In an embodiment of the present invention, a highly safe casting-molded ship bottom shielding structure is provided. The template position is determined according to the shielding design result. During the double bottom construction stage, the corresponding positions of each section of the double bottom are marked during the layout, and installation interfaces of the template 1, the pouring port 3 and the exhaust port 4 are reserved. After the bottom shielding has the construction conditions, the installation route is reasonably planned to ensure that each installation position is accessible. The casting pipeline is pulled in sequence from the inside to the outside to pressurize and inject the shielding material to ensure the integrity of the molded shielding body.

[0039] Among them, for the outermost casting grid, the template 1 is fixed on the double-layer bottom structure by welding or bolting, and the gap is processed to ensure that the area surrounded by the template and the double-layer bottom structure is leak-proof. The shielding putty injection pipe is connected to the pouring port 3 and the exhaust port 4, and the shielding putty is injected into the space surrounded by the mold and the double-layer bottom structure by pressurized injection, and it is ensured that the poured shielding body 2 is tight and has no cavity. Finally, remove the putty injection pipe, seal the pouring hole and the exhaust hole, and wait for the shielding putty to react and solidify by itself.

[0040] In yet another embodiment of the present invention, a ship is provided, the ship comprising a high-safety cast-molded ship bottom shielding structure as described in any one of the above items.

[0041] In an embodiment of the present invention, a high-safety casting-molded ship reactor bottom shielding structure and a ship are provided. The reactor bottom shielding structure is arranged in a double bottom structure below a reactor, and includes: a template, a shielding body, a pouring port, and an exhaust port. The template is a steel plate connected to the double bottom structure below the reactor. The template reserves a pouring port and an exhaust port. The cavity surrounded by the template and the double bottom structure is a container required for casting shielding materials. The shielding body is a solidified product of the shielding material, and the shielding material is injected into the container required for casting the shielding material through the pouring port and the exhaust port.

[0042] The technical solution of the present invention sets a reactor bottom shield in the double bottom to minimize the scattering of neutrons and gamma rays from the bottom of the reactor to the adjacent area, protecting the radiation safety of personnel and equipment in the adjacent area. At the same time, it reduces the radiation level of the hull outer plate below the reactor, protects the radiation-resistant paint of the hull outer plate, and avoids corrosion beyond the design of the hull structure.

[0043] 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 high-safety cast-molded marine reactor bottom shielding structure, arranged in a double bottom structure below the reactor, characterized in that: The shielding structure is an integral casting structure, comprising: a template (1), a shielding body (2), a pouring port (3) and an exhaust port (4); The template (1) is a steel plate connected to the double bottom structure below the reactor. The template (1) reserves the pouring port (3) and the exhaust port (4). The cavity enclosed by the template (1) and the double bottom structure is a container required for pouring shielding materials. The shielding body (2) is a solidified product of the shielding material, and the shielding material is injected into the container required for casting the shielding material through the pouring port (3) and the exhaust port (4).

2. A high-safety casting-molded ship bottom shielding structure according to claim 1, characterized in that: The template (1) is formed by welding a group of block templates, and the template (1) is connected to the double-layer bottom structure by bolt connection or welding.

3. A high-safety casting-molded ship bottom shielding structure according to claim 1, characterized in that: The area enclosed by the template (1) does not exceed the outer contour area of ​​the primary shielding, and is not smaller than the projected area of ​​the reactor body.

4. A high-safety casting-molded ship bottom shielding structure according to claim 1, characterized in that: The casting area filled with the shielding material is ensured to prevent leakage of the shielding material by at least caulking and welding.

5. A high-safety casting-molded ship bottom shielding structure according to claim 1, characterized in that: The shielding body (2) is a solidified product formed by curing a shielding material including at least shielding putty and concrete.

6. A high-safety casting-molded ship bottom shielding structure according to claim 5, characterized in that: The shielding material is pressurized and injected into the casting area through the casting port (3) and the exhaust port (4); after the casting area is filled, the casting port (3) and the exhaust port (4) are sealed.

7. A high-safety casting-molded ship bottom shielding structure according to claim 1, characterized in that: The reactor bottom shield is in the shape of a cylindrical entity, which is arranged in the double bottom structure below the reactor and covers the entire double bottom in the height direction.

8. A ship, characterized in that: The ship comprises a high-safety cast-molded ship bottom shielding structure as described in any one of claims 1 to 7.

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