阅读说明：本技术 一种浮动式核电站舱室的二次屏蔽结构 (Secondary shielding structure of floating type nuclear power station cabin ) 是由 吕焕文 王军龙 应栋川 谭怡 李兰 刘嘉嘉 魏述平 邓理邻 田超 于 2018-09-17 设计创作，主要内容包括：本发明公开了一种浮动式核电站舱室的二次屏蔽结构,包括放置反应堆的第一舱室和工作人员所待的第二舱室,第一舱室和第二舱室并排设置,第一舱室和第二舱室之间并排设置有缓冲舱室,第一舱室和缓冲舱室之间的阻隔墙为内层屏蔽墙体,内层屏蔽墙体靠近缓冲舱室的一侧墙面上设置有第一屏蔽层,缓冲舱室和第二舱室之间的阻隔墙为外层屏蔽墙体,外层屏蔽墙体靠近缓冲舱室的一侧墙面上设置有第二屏蔽层,外层屏蔽墙体靠近第二舱室的一侧墙面上设置有第三屏蔽层,第一屏蔽层为γ射线屏蔽材料层,第二屏蔽层为中子屏蔽材料层,第三屏蔽层为次生γ射线屏蔽材料层。本发明能够有效分担核电站舱室壁面承受的屏蔽材料重量和提升射线的屏蔽能力。(The invention discloses a secondary shielding structure of a floating nuclear power station cabin, which comprises a first cabin for placing a reactor and a second cabin for workers to wait, wherein the first cabin and the second cabin are arranged side by side, a buffer cabin is arranged between the first cabin and the second cabin side by side, a separation wall between the first cabin and the buffer cabin is an inner layer shielding wall, a first shielding layer is arranged on one side wall surface of the inner layer shielding wall close to the buffer cabin, the separation wall between the buffer cabin and the second cabin is an outer layer shielding wall, a second shielding layer is arranged on one side wall surface of the outer layer shielding wall close to the buffer cabin, a third shielding layer is arranged on one side wall surface of the outer layer shielding wall close to the second cabin, the first shielding layer is a gamma ray shielding material layer, the second shielding layer is a neutron shielding material layer, and the third shielding layer is a secondary gamma ray shielding material layer. The invention can effectively share the weight of the shielding material borne by the wall surface of the cabin of the nuclear power station and improve the shielding capability of rays.)

1. A secondary shielding structure of a floating type nuclear power station cabin comprises a first cabin (1) for placing a reactor and a second cabin (2) for workers to wait, wherein the first cabin (1) and the second cabin (2) are arranged side by side, and is characterized in that a buffer cabin is arranged between the first cabin (1) and the second cabin (2) side by side, a separation wall between the first cabin (1) and the buffer cabin is an inner shielding wall (5), a first shielding layer (8) is arranged on one side wall surface of the inner shielding wall (5) close to the buffer cabin, the separation wall between the buffer cabin and the second cabin (2) is an outer shielding wall (7), a second shielding layer (9) is arranged on one side wall surface of the outer shielding wall (7) close to the buffer cabin, a third shielding layer (10) is arranged on one side wall surface of the outer shielding wall (7) close to the second cabin (2), the first shielding layer (8) is used for shielding gamma rays, the second shielding layer (9) is used for shielding neutrons, and the third shielding layer (10) is used for shielding secondary gamma rays.

2. The secondary shielding structure of the cabin of the floating nuclear power station as claimed in claim 1, wherein the buffer cabin comprises a third cabin (3) and a fourth cabin (4) which are arranged side by side, a middle shielding wall (6) is arranged between the third cabin (3) and the fourth cabin (4) to serve as a barrier wall, a fourth shielding layer (11) is arranged on the side surface of the middle shielding wall (6) close to the third cabin (3), a fifth shielding layer (12) is arranged on the side surface of the middle shielding wall (6) close to the fourth cabin (4), and the fourth shielding layer (11) and the fifth shielding layer (12) are used for shielding gamma rays or neutrons.

3. The secondary shielding structure of a floating nuclear power plant cabin according to claim 1, characterized in that the first shielding layer (8) is a lead-based material layer.

4. The secondary shielding structure of a floating nuclear power plant cabin according to claim 2, characterized in that the fourth shielding layer (11) and the fifth shielding layer (12) are both made of a layer of lead-based or boron-containing polyethylene-based material.

5. The cabin structure capable of secondary shielding of a floating nuclear power plant as claimed in claim 1, characterized in that the second shielding layer (9) is a layer of material of boron-containing polyethylene material type.

6. The floating nuclear power plant secondary shieldable cabin structure of claim 1 wherein the third shield layer (10) is a lead-based material layer.

Technical Field

The invention relates to the field of cabin shielding arrangement of a floating nuclear power station, in particular to a secondary shielding structure of a cabin of a floating nuclear power station, which reduces the irradiation on cabin personnel and aims at the radioactive irradiation risk caused by radioactive rays released by a reactor and a primary loop system radiation source penetrating through the cabin shielding.

Background

The floating nuclear power station adopts the nuclear fuel self-sustaining chain fission reaction to generate heat energy and converts the heat energy into electric energy for electric power output. During the operation of the reactor, a great deal of neutrons and gamma rays (including direct gamma rays and fission product decay gamma rays) are released by a reactor core along with fission reaction; the coolant in the reactor loop system is activated in a strong neutron irradiation field to generate high-radioactivity activation source items, and decay to release a large amount of high-energy gamma rays. These neutrons and gamma rays pass through the primary and secondary shields and cause radiation exposure to personnel outside the reactor vessel. In addition, under the accident condition, fission products existing in the coolant are dispersed in the whole reactor cabin in the form of airborne radioactivity, the airborne radioactive nuclides are continuously decayed, gamma rays, beta rays and the like are emitted, and the rays can still cause radiation irradiation on a human body after being blocked by secondary shielding.

At present, most of secondary shielding adopts a suspension design scheme to suspend shielding materials on the wall surface of a reactor cabin. Under the accident condition, the reactor cabin is in a high-temperature and high-pressure environment, so that the selected shielding material can bear high temperature and has a good shielding effect, and the selection range of the shielding material is limited; in addition, if the thickness of the shielding material is larger, the weight of the shielding material is also larger, the wall surface of the reactor is easy to deform by adopting a suspension mode, and meanwhile, the shielding material is not easy to fix; if the thickness of the selected shielding material is smaller, the corresponding shielding effect can not be achieved. The existing shielding structure design can not solve the problem

disclosure of Invention

Aiming at the technical problem, the invention provides a secondary shielding structure of a floating nuclear power station cabin, and the arrangement of the cabin structure can improve the secondary shielding effect and achieve the purpose of reducing the irradiation risk of personnel outside the cabin.

the invention is realized by the following technical scheme:

The utility model provides a secondary shielding structure in floating nuclear power station cabin, including the first cabin of placing the reactor and the second cabin that the staff waited, first cabin and second cabin set up side by side, be provided with the buffering cabin side by side between first cabin and the second cabin, the separation wall between first cabin and the buffering cabin is inlayer shielding wall body, be provided with first shielding layer on the wall of one side that inlayer shielding wall body is close to the buffering cabin, the separation wall between buffering cabin and the second cabin is outer shielding wall body, be provided with the second shielding layer on the wall of one side that outer shielding wall body is close to the buffering cabin, be provided with the third shielding layer on the wall of one side that outer shielding wall body is close to the second cabin, first shielding layer is gamma ray shielding material layer, the second shielding layer is neutron shielding material layer, the third shielding layer is secondary gamma ray shielding material layer.

According to the invention, the buffer cabin is arranged between the first cabin and the second cabin, and the first cabin and the second cabin can be isolated by the buffer cabin under the accident condition, so that the high-temperature and high-pressure environment borne by the outer-layer shielding wall body is effectively reduced. The inner shielding wall is provided with a first shielding layer which is mainly used for shielding gamma rays, and the outer shielding wall is provided with a shielding layer which is mainly used for shielding neutrons and secondary gamma rays generated when the neutrons pass through the boron-containing polyethylene shielding layer. The shielding effect of the invention is thus embodied: the gamma rays and neutrons generated by the reactor are blocked by the inner shielding wall, firstly pass through the first shielding layer, the first shielding layer mainly shields the gamma rays, and then the subsequent second shielding layer and the third shielding layer shield the neutrons and the secondary gamma rays.

A middle shielding wall body is arranged between the third cabin and the fourth cabin and serves as a separation wall, a fourth shielding layer is arranged on the side face, close to the third cabin, of the middle shielding wall body, a fifth shielding layer is arranged on the side face, close to the fourth cabin, of the middle shielding wall body, and the fourth shielding layer and the fifth shielding layer can be neutron or gamma-ray shielding material layers as required.

In addition, the shielding layers are arranged on the two sides of the middle shielding wall body and the outer shielding wall body, so that the phenomenon of unbalanced stress can be relieved, and the deformation of the wall surface of the cabin of the nuclear power station is reduced. And the arrangement of the middle shielding wall body can also reduce the bearing load of the inner shielding wall body, prevent the deformation of the inner shielding wall body, help to prevent high-temperature heat from diffusing to the second cabin and reduce the high-temperature and high-pressure environment borne by the shielding wall body.

The first shielding layer is a lead-based material layer.

The second shielding layer is a boron-containing polyethylene material layer.

The third shielding layer is a lead material layer.

The fourth shielding layer and the fifth shielding layer are lead or boron-containing polyethylene material layers. The specific setting can be carried out according to the requirement of the shielding effect.

First shielding layer is owing to be close to first cabin setting, with the first cabin environment direct contact of high temperature high pressure, therefore first-selected high temperature resistant material, and other shielding layers then do not receive the influence of high temperature high pressure environment so first-selected effectual shielding material of shielding.

Compared with the prior art, the invention has the following advantages and beneficial effects:

according to the invention, the inner shielding wall and the outer shielding wall are arranged in the cabin of the original floating type nuclear power station, and the shielding layers are arranged on the wall surfaces of the inner shielding wall and the outer shielding wall, so that the gravity borne by the single-layer shielding wall can be effectively shared and the shielding capability of rays can be improved.

The arrangement of the middle shielding wall body can also play a role in increasing the shielding effect, reasonably sharing the shielding weight, preventing high-temperature heat from diffusing to the second cabin, and the arrangement of the shielding wall body can be increased according to needs.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:

FIG. 1 is a schematic view of the structure of the present invention.

Reference numbers and corresponding part names in the drawings:

1-a first cabin, 2-a second cabin, 3-a third cabin, 4-a fourth cabin, 5-an inner shielding wall, 6-a middle shielding wall, 7-an outer shielding wall, 8-a first shielding layer, 9-a second shielding layer, 10-a third shielding layer, 11-a fourth shielding layer, and 12-a fifth shielding layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.