Block-out wall

Abstract

To provide a block-out wall that is easily mounted in a building of a nuclear power plant, while maintaining a safety function.SOLUTION: In part of block-out wall of the present invention of at least one surface of the wall of a chamber that accommodates apparatuses inside a nuclear power plant, a plurality of steel blocks extending in a height direction are arranged to block the openings between frames of the wall, and the steel blocks removably fasten by bolts an upper part and a lower part. The steel block has two layers in a width direction of the wall, and an outside surface of the chamber is formed of a plurality of first steel blocks and an inside surface of the chamber is formed of a plurality of second steel blocks. Contact surfaces of the plurality of first steel blocks and contact surfaces of the plurality of second steel blocks are arranged shifted from each other, so that the gaps between the steel blocks have a labyrinth structure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a blockout wall. [Background technology]

[0002] In nuclear power plants, it is necessary to ensure that the equipment access routes are not obstructed when replacing equipment in the building structure that contains the rooms that house the equipment. Conventionally, temporary demolition and restoration using blockout walls has been used.

[0003] Patent Document 1 discloses a technology in which a frame body is provided between the building wall, vertical supports are provided within the shielding wall, and multiple blocks are supported by the frame body and supports, and the multiple blocks are supported by the frame body, vertical supports, and horizontal frames perpendicular to the frame body.

[0004] Patent Document 2 discloses a technology for a shielding construction and support frame having a shielding material filling construction space equipped with a shielding material pressure inlet and outlet and a heating mechanism attached, and a shielding material transport container with an injection valve and a heating mechanism attached.

[0005] Patent Document 3 discloses a technology having a pair of frames formed of a hard material at opposite ends, one of the frames having an inlet for feeding radiation shielding material and an outlet for discharging the fed radiation shielding material, and a stretchable shielding material storage section between the frames that communicates with the inlet. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-169883 [Patent Document 2] Japanese Patent Application Publication No. 62-263500 [Patent Document 3] Japanese Patent Application Laid-Open No. 2014-35318 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in order to comply with the new regulatory standards, various safety features are often required in the structure, making it difficult to place the blockout walls that have traditionally been used along the equipment removal route.

[0008] The new regulatory standards include Article 4 of the Regulations Concerning the Standards for the Location, Structure and Equipment of Practical Power Reactors and Their Auxiliary Facilities, which requires maintaining integrity against seismic forces and maintaining shielding and airtight functions; Article 8, which requires fire resistance; and Article 9, which requires barriers to prevent the spread of internal flooding.

[0009] A blockout wall that can ensure the safety functions required by the new regulatory standards while also having an easily removable structure is desirable.

[0010] An object of the present invention is to provide a blockout wall that can be easily attached and detached in a nuclear power plant building while maintaining its safety function. [Means for solving the problem]

[0011] The blockout wall of the present invention is characterized in that a plurality of steel blocks extending in the vertical direction are arranged in a blockout wall on at least a portion of one side of a wall of a room that stores equipment in a nuclear power plant, so as to block openings between the body of the wall, and the steel blocks are detachably fastened at the top and bottom with bolts. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a blockout wall that can be easily attached and detached in a nuclear power plant building while maintaining safety functions.

[0013] Problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0014] [Figure 1] 1 shows a conceptual diagram of a multi-functional blockout wall according to this embodiment. [Figure 2] 1 shows the fixing structure of the multifunctional blockout wall of this embodiment to the floor and ceiling surfaces. [Figure 3] 1 shows a diagram of a block with a shield filling hole according to this embodiment. [Figure 4] 1 shows a conceptual diagram of a multi-functional blockout wall according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments are illustrative for explaining the present invention, and some omissions and simplifications have been made as appropriate for clarity of explanation. The present invention can be implemented in various other forms. Unless otherwise specified, each component may be singular or plural.

[0016] In order to facilitate understanding of the invention, the position, size, shape, range, etc. of each component shown in the drawings may not represent the actual position, size, shape, range, etc. Therefore, the present invention is not necessarily limited to the position, size, shape, range, etc. disclosed in the drawings. [Example]

[0017] An embodiment of a multi-function blockout wall applied to the wall of a building in a nuclear power plant will be described. A containment room is formed within the building in the nuclear power plant to house various nuclear-related equipment. Such facilities require various safety functions, particularly stable shielding functions and a robust structure. This embodiment can be applied to at least a portion of one surface of the wall of a building that houses equipment. This embodiment can also be applied to at least a portion of one surface of the wall of a containment room that houses equipment within the building. In this embodiment, buildings, containment rooms, and other structures that house equipment are collectively referred to as rooms.

[0018] FIG. 1 is a conceptual diagram of the multi-function blockout wall of this embodiment. It will be explained using an example of a building. The left-right direction in the figure is the width direction of the wall, the depth direction in the figure is the thickness direction of the wall, and the up-down direction in the figure is the height direction of the wall. The building skeleton 1 is the skeleton part of the building. Between the building skeletons 1, there is a skeleton gap 7 which is an opening. The multi-function blockout wall of this embodiment is installed in this skeleton gap 7 which is an opening.

[0019] The multi-function blockout wall of this embodiment is composed of steel blocks extending in the height direction. The steel blocks are installed in multiple rows across the width of the wall to cover the opening in the building skeleton 1. As will be described later, these steel blocks are detachably fastened at the top and bottom. Each steel block is manufactured from steel plate of a specified thickness. By detachably fastening multiple steel blocks at the top and bottom in this way, the safety functions required by the new regulatory standards can be ensured when the steel blocks are installed. Furthermore, when transporting or loading equipment inside, the top and bottom fastenings are released to form an opening, and the equipment can be easily transported or loaded through the opening.

[0020] In Figure 1, the wall has a two-layer structure in the thickness direction, consisting of a group of first steel blocks 10 and a group of second steel blocks 11. The contact surfaces of the multiple first steel blocks 10 and the contact surfaces of the multiple second steel blocks 11 are configured to be offset in the width direction of the wall. Here, it is desirable that the multi-functional blockout wall of this embodiment has at least a two-layer structure.

[0021] In this way, by forming at least a two-layer structure in the thickness direction of the wall and configuring the contact surfaces of the plurality of first steel blocks 10 and the contact surfaces of the plurality of second steel blocks 11 to be offset in the width direction of the wall, it is possible to suppress leakage from the contact surfaces of the plurality of first steel blocks 10 and the contact surfaces of the plurality of second steel blocks 11. In other words, the contact surfaces of the plurality of first steel blocks 10, the surfaces between the plurality of first steel blocks 10 and the plurality of second steel blocks 11, and the gaps at the contact surfaces of the plurality of second steel blocks 11 form a labyrinth structure, which allows the shielding function to be maintained and suppresses radiation leakage due to streaming.

[0022] Figure 2 shows the structure of fixing the multi-function blockout wall to the building floor surface 3 and building ceiling surface 4. In the illustration, the left-right direction is the thickness direction of the wall. In this embodiment, the upper and lower fastenings are described as being to the building ceiling surface 4 and building floor surface 3. However, the multi-function blockout wall can also be applied to part of the wall. Steel blocks are firmly and detachably fixed to the building ceiling surface 4 and building floor surface 3 with fastening bolts 8. A plurality of first steel blocks 10 and a plurality of second steel blocks 11 are respectively fitted into fastening brackets 5, and the fastening brackets 5 are fastened to the upper and lower parts, i.e., the building ceiling surface 4 and building floor surface 3, with the fastening bolts 8.

[0023] In this embodiment, the plurality of first steel blocks 10 and the plurality of second steel blocks 11 are each fitted with a fixing bracket 5, but the plurality of first steel blocks 10 and the plurality of second steel blocks 11 may also be fastened with individual jigs. [Example]

[0024] Next, an example of a steel block will be described. Figure 3 shows a steel block having a shield filling hole.

[0025] The steel block of this embodiment has a cavity for filling with a shielding material. The upper and lower parts have shielding filling holes 6 for entrance and exit, respectively. When the steel block 2 is installed as a block-out wall with a shielding function, a shielding medium is introduced into the steel block.

[0026] Examples of shielding media that can be used include lead wool, iron balls of different sizes, and water. By filling the steel block with at least one of these, it is possible to ensure the necessary shielding function. When removing the steel block, the shielding media can be removed from the steel block to reduce its weight. This means that the workability of removing the steel block is improved, and the transportation of the steel block is made easier. [Example]

[0027] 4 is a conceptual diagram of the multifunctional blockout wall of this embodiment. In this embodiment, the entire outer surface on the side of the second steel block 11 is covered with a surface layer 12. It may also be provided on the outer surface on the side of the first steel block 10. It may also be provided between the first steel block 10 and the second steel block 11.

[0028] When fire resistance is required, the surface layer 12 can be made of a fire-resistant sheet to improve the fire resistance.

[0029] When watertightness is required, the surface layer 12 can be made of a steel plate to improve airtightness and watertightness.

[0030] In this embodiment, the blocks are covered with a surface layer, but the airtightness and watertightness can be improved by caulking the joints at the contact points between the multiple first steel blocks 10 and the multiple second steel blocks 11. [Explanation of symbols]

[0031] 1...Building frame, 2...steel block, 3...Building floor, 4...Building ceiling surface, 5...Fixing bracket, 6...shield filling hole, 7...Structure gap, 8... Fastening bolt, 10...First steel block, 11...Second steel block, 12…Surface layer

Claims

1. In a blockout wall of at least a portion of one wall of a room containing equipment in a nuclear power plant, A plurality of steel blocks extending in the height direction are arranged to close the openings between the walls, A blockout wall characterized in that the steel blocks have their upper and lower parts detachably fastened with bolts.

2. 2. The blockout wall of claim 1, The steel blocks are two-layered in the width direction of the wall, and the outer surface of the room is composed of a plurality of first steel blocks and the inner surface of the room is composed of a plurality of second steel blocks, A blockout wall characterized in that the contact surfaces of the plurality of first steel blocks and the contact surfaces of the plurality of second steel blocks are arranged in a staggered manner, and the gaps between the steel blocks form a labyrinth structure.

3. 2. The blockout wall of claim 1, A blockout wall, characterized in that the steel block has a cavity, and the cavity is filled with a shielding medium.

4. 2. The blockout wall of claim 1, The steel block has a cavity, and the cavity is filled with a shielding medium; A blockout wall, characterized in that the shielding medium is at least one of lead wool, iron balls of different sizes, and a liquid medium.

5. 2. The blockout wall of claim 1, A blockout wall characterized by placing a fireproof sheet on the surface of the steel block.

6. 2. The blockout wall of claim 1, A blockout wall characterized by placing a steel plate on the surface of the steel block.

7. 2. The blockout wall of claim 1, A blockout wall characterized by caulking the joints where the steel blocks contact each other.

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