Shielding structure with inverted pyramid-shaped reactor bottom for ship and ship

Abstract

The invention provides a shielding structure of a marine inverted pyramid reactor bottom and a ship, the shielding structure is arranged in a double-bottom structure below a reactor, the shielding structure is of an inverted pyramid structure, and the shielding structure comprises a shielding body and a supporting structure. The shielding structure and the primary shielding of the reactor together form complete radiation shielding containment on a reactor source item, a shielding body adopts an inverted pyramid structure form, and a'tower footing 'of the inverted pyramid structure covers a projection area of the primary shielding on a double-layer bottom; in the inverted pyramid-shaped reactor bottom shielding structure, the thickness and the material required by each step of the shielding body are determined according to a radiation shielding calculation result of the reactor; the height and material of the support structure are determined based on the structure of the shield. According to the technical scheme, complete radiation shielding can be formed for the reactor source item together with primary shielding of the reactor, leakage of the reactor source item to the surrounding area is weakened to the maximum extent, and radiation safety of personnel and equipment in the surrounding area is guaranteed.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear radiation protection, and in particular relates to a shielding structure of a ship's inverted pyramid-shaped reactor bottom and a ship. Background Art

[0002] At present, a double bottom structure is installed under the reactor compartment of nuclear-powered ships and nuclear-powered floating platforms, resulting in a large cavity between the reactor and the seawater under the hull. However, due to the weight and center of gravity limitation, the bottom shielding of the reactor primary shield itself is usually relatively weak, resulting in a large radiation intensity at the bottom of the primary shield. Among them, the maximum radiation at the bottom of the primary shield is 5 orders of magnitude higher than that on the side of the primary shield, and it is strong in the middle and gradually weakened at the edge. These neutrons and gamma rays are violently backscattered by the seawater at the bottom of the ship and the double bottom structure, which will cause the radiation field in the adjacent cabins to seriously exceed the standard, affecting the radiation safety of personnel and equipment in the adjacent cabins.

[0003] Therefore, how to provide a shielding structure and ship with a ship-borne inverted pyramid-shaped reactor bottom that can, together with the reactor primary shield, form a complete radiation shielding enclosure for the reactor source item, minimize the leakage of the reactor source item to the surrounding area, and ensure the radiation safety of personnel and equipment in the surrounding area has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiment of the present invention provides a shielding structure of a ship-mounted inverted pyramid reactor bottom and a ship, which can form a complete radiation shielding enclosure for the reactor source term together with the reactor primary shield, minimize the leakage of the reactor source term to the surrounding area, and ensure the radiation safety of personnel and equipment in the surrounding area.

[0005] In one embodiment of the present invention, a shielding structure of an inverted pyramid-shaped reactor bottom for a ship is provided, which is arranged in a double bottom structure below a reactor and is in the form of an inverted pyramid structure, and includes: a shielding body 1 and a support structure 2.

[0006] The shielding structure and the reactor primary shield together form a complete radiation shielding enclosure for the reactor source term. The shielding body 1 adopts an inverted pyramid structure, and the "tower base" of the inverted pyramid structure covers the projection area of ​​the primary shield on the double bottom.

[0007] In the inverted pyramid reactor bottom shielding structure, the thickness and material required for each step of the shielding body 1 are determined according to the calculation results of the radiation shielding of the reactor; the height and material of the supporting structure 2 are determined based on the structure of the shielding body 1.

[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 material, boron steel and steel plate.

[0009] Furthermore, the shielding body 1 is a layered stacking molding structure, and the shielding body 1 is a complete structure without a through cavity structure.

[0010] Furthermore, the shielding body 1 is a cast-molded structure, and the shielding body 1 is a complete structure without a through-cavity structure.

[0011] Furthermore, the support structure 2 is a high-strength, corrosion-resistant structural material including at least stainless steel and titanium alloy.

[0012] Furthermore, the support structure 2 is connected to the double bottom structure of the reactor by welding or by connecting or bolting.

[0013] Furthermore, by adopting a bolt connection method, during the construction stage of the double bottom structure of the reactor, the base and connection interface of the reactor are reserved at the corresponding design position, and the materials are introduced and bolted during the construction process.

[0014] In yet another embodiment of the present invention, a ship is provided, the ship comprising the shielding structure of the inverted pyramid-shaped bottom for ship as described in any one of the above items.

[0015] The beneficial effects brought by the present invention are as follows:

[0016] It can be seen from the above scheme that the embodiment of the present invention provides a shielding structure of a marine inverted pyramid reactor bottom and a ship. The shielding structure is arranged in a double-bottom structure below the reactor, and is in the form of an inverted pyramid structure, including: a shielding body and a supporting structure. The shielding structure and the primary shielding of the reactor together form a complete radiation shielding enclosure for the reactor source term. The shielding body adopts an inverted pyramid structure, and the "tower base" of the inverted pyramid structure covers the projection area of ​​the primary shielding on the double bottom. In the inverted pyramid reactor bottom shielding structure, the thickness and material required for each step of the shielding body are determined according to the calculation results of the radiation shielding of the reactor; the height and material of the supporting structure are determined based on the structure of the shielding body. The technical solution of the present invention can form a complete radiation shielding enclosure for the reactor source term together with the primary shielding of the reactor, minimize the leakage of the reactor source term to the surrounding area, and ensure the radiation safety of personnel and equipment in the surrounding area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram showing a typical arrangement of a shielding structure of an inverted pyramid-shaped reactor bottom for a ship according to an embodiment of the present invention;

[0018] Figure 2 A schematic plan view showing a shielding structure of an inverted pyramid-shaped reactor bottom for a ship according to an embodiment of the present invention;

[0019] In the figure, 1 is a shielding body and 2 is a supporting structure. DETAILED DESCRIPTION

[0020] 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.

[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 adjacent cabins through the seawater at the bottom of the ship and the double bottom, resulting in serious excessive radiation fields in cabins adjacent to the reactor, combined with the characteristics of the reactor and the primary shielding bottom radiation source items being large in the middle and small at the edges, an embodiment of the present invention proposes a ship-used inverted pyramid reactor bottom shielding structure.

[0022] like Figure 1 and Figure 2 As shown, Figure 1 A schematic diagram showing a typical arrangement of a shielding structure of an inverted pyramid-shaped reactor bottom for a ship according to an embodiment of the present invention; Figure 2 A schematic plan view of a shielding structure of an inverted pyramid-shaped reactor bottom for a ship according to an embodiment of the present invention.

[0023] In the figure, a shielding structure of an inverted pyramid-shaped reactor bottom for a ship is arranged in a double bottom structure below the reactor. The structure is in the form of an inverted pyramid and includes: a shielding body 1 and a supporting structure 2.

[0024] The shielding structure and the reactor primary shield together form a complete radiation shielding enclosure for the reactor source term. The shielding body 1 adopts an inverted pyramid structure, and the "tower base" of the inverted pyramid structure covers the projection area of ​​the primary shield on the double bottom.

[0025] In the inverted pyramid reactor bottom shielding structure, the thickness and material required for each step of the shielding body 1 are determined according to the calculation results of the radiation shielding of the reactor; the height and material of the supporting structure 2 are determined based on the structure of the shielding body 1.

[0026] In the embodiment of the present invention, an inverted pyramid-shaped reactor bottom shielding structure is arranged in a double-layer bottom structure below the reactor. The structure is in the form of an inverted pyramid, and has the outstanding advantages of simple structure and light weight. It can form a complete radiation shielding enclosure for the reactor source term together with the reactor primary shielding, and minimize the leakage of the reactor source term to the surrounding area, ensuring the radiation safety of personnel and equipment in the surrounding area. In the embodiment of the present invention, the reactor bottom shielding structure reduces the weight by more than 60% compared with the form of fully filling the reactor bottom.

[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 material, boron steel and steel plate.

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

[0029] In one embodiment of the present invention, it is a layered stacking molding structure, and the shielding body 1 is a complete structure without a through cavity structure.

[0030] In one embodiment of the present invention, the shielding body 1 is a cast-molded structure, and the shielding body 1 is a complete structure without a through cavity structure.

[0031] The shielding body 1 may be installed in a layered stacking or casting manner, but the integrity of the shielding body and the absence of penetrating cavities should be ensured.

[0032] In one embodiment of the present invention, the support structure 2 is a high-strength, corrosion-resistant structural material including at least stainless steel and titanium alloy.

[0033] In another embodiment of the present invention, the support structure 2 is connected to the double bottom structure of the reactor by welding or connecting or bolting.

[0034] In the embodiment of the present invention, a bolt connection method is adopted. During the construction stage of the double bottom structure of the reactor, the base and connection interface of the reactor are reserved at the corresponding design position, and materials are introduced and fixed with bolts during the construction process.

[0035] Among them, since the support structure 2 of the reactor bottom shield needs to serve for its entire life, its strength should be strong enough and corrosion-resistant, and its material can be stainless steel, titanium alloy, etc. Among them, the connection between the support structure and the double bottom structure can be welded or bolted. For example, by using the bolt connection method, the base and connection interface can be reserved at the corresponding design position during the construction stage of the double bottom structure, and the material can be directly introduced and bolted in the later construction process.

[0036] In the embodiment of the present invention, during the design and installation of the reactor bottom shield, the characteristics of the double bottom structure should be fully considered, the installation route should be reasonably planned, and the shield should be installed step by step from the central area to the outside to ensure that each installation position is accessible and the integrity of the installation structure is guaranteed.

[0037] In yet another embodiment of the present invention, a ship is provided, the ship comprising the shielding structure of the inverted pyramid-shaped bottom for ship as described in any one of the above items.

[0038] In an embodiment of the present invention, a shielding structure of a ship-type inverted pyramid reactor bottom is provided. The reactor bottom shielding is arranged in a double bottom structure below the reactor. The structure is in the form of an inverted pyramid. The "tower base" should cover the projection area of ​​the primary shielding on the double bottom as much as possible. The thickness and material required for each step of the inverted pyramid structure are determined according to the radiation shielding calculation results.

[0039] The shielding structure is arranged in the double-layer bottom structure below the reactor, and is in the form of an inverted pyramid structure, including: a shielding body and a supporting structure. The shielding structure and the reactor primary shielding together form a complete radiation shielding enclosure for the reactor source term. The shielding body adopts an inverted pyramid structure, and the "tower base" of the inverted pyramid structure covers the projection area of ​​the primary shielding on the double-layer bottom. In the inverted pyramid reactor bottom shielding structure, the thickness and material required for each step of the shielding body are determined according to the calculation results of the radiation shielding of the reactor; the height and material of the supporting structure are determined based on the structure of the shielding body.

[0040] The technical solution of the present invention is a shielding structure of a ship-used inverted pyramid reactor bottom, which can form a complete radiation shielding enclosure for the reactor source item together with the reactor primary shield, thereby minimizing the leakage of the reactor source item to the surrounding area and ensuring the radiation safety of personnel and equipment in the surrounding area.

[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 shielding structure of a ship's inverted pyramid reactor bottom, arranged in a double bottom structure below a reactor, in the form of an inverted pyramid structure, characterized in that: The shielding structure comprises: a shielding body (1) and a supporting structure (2); The shielding structure and the reactor primary shield together form a complete radiation shielding enclosure for the reactor source term, and the shielding body (1) adopts an inverted pyramid structure, and the "tower base" of the inverted pyramid structure covers the projection area of ​​the primary shield on the double bottom; In the inverted pyramid-shaped reactor bottom shielding structure, the thickness and material required for each step of the shielding body (1) are determined according to the calculation results of the radiation shielding of the reactor; the height and material of the supporting structure (2) are determined based on the structure of the shielding body (1).

2. A shielding structure of an inverted pyramid-shaped pile bottom for a ship 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, boron steel and steel plate.

3. A shielding structure of an inverted pyramid-shaped pile bottom for a ship according to claim 2, characterized in that: The shielding body (1) is a layered stacked structure, and the shielding body (1) is a complete structure without a through cavity structure.

4. A shielding structure of an inverted pyramid-shaped pile bottom for a ship according to claim 2, characterized in that: The shielding body (1) is a cast-molded structure, and the shielding body (1) is a complete structure without a through-cavity structure.

5. The shielding structure of the inverted pyramid-shaped pile bottom for ship according to claim 2, characterized in that: The support structure (2) is a high-strength, corrosion-resistant structural material comprising at least stainless steel and titanium alloy.

6. The shielding structure of the inverted pyramid-shaped pile bottom for ship according to claim 5, characterized in that: The support structure (2) is connected to the double bottom structure of the reactor by welding or by bolting.

7. The shielding structure of the inverted pyramid-shaped pile bottom for a ship according to claim 6, characterized in that: The bolt connection method is adopted. During the construction stage of the double bottom structure of the reactor, the base and connection interface of the reactor are reserved at the corresponding design position, and the materials are introduced and bolted during the construction process.

8. A ship, characterized in that: The ship comprises a shielding structure of a ship-used inverted pyramid-shaped bottom as described in any one of claims 1 to 7.

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