Cavern structure for nuclear waste disposal

Abstract

The utility model relates to a cavern structure for nuclear waste disposal, the cavern structure is arranged in a rock stratum, the cavern structure comprises a sealed space defined by a base, an outer wall body and a top cover, a plurality of separating walls are arranged in the sealed space, and the base, the outer wall body, the top cover and the separating walls are all of reinforced concrete structures; the sealed space is divided into a plurality of compartments for accommodating nuclear wastes by the separating walls, and gravel filling layers are arranged outside the outer wall body and the top cover. The cavern structure for nuclear waste disposal is provided with a plurality of compartments and can be used for containing medium-low radioactive nuclear waste, multiple layers of barriers such as the separating walls, the outer wall bodies, the top covers and the gravel filling layers are arranged outside the compartments, safe storage and isolation of the medium-low radioactive nuclear waste are achieved, radiation is effectively shielded, and safety is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear waste disposal, and more particularly, to a cavern structure for nuclear waste disposal. BACKGROUND

[0002] With the rapid development of China's nuclear power industry, the number of under-construction and in-operation units is gradually increasing. Since 2005, China has built dozens of pressurized water reactor nuclear power plants in batches. The medium and low level radioactive nuclear waste generated and accumulated during the operation of these nuclear power plants will increase more and more. In addition, most of these nuclear power plants have a design life of about 40 years, and in the future, the decommissioning of these nuclear power plants will also generate a large amount of medium and low level radioactive nuclear waste. How to safely dispose of these medium and low level radioactive nuclear waste has become one of the key factors for the sustainable development of China's nuclear energy. However, the construction and operation of the medium and low level radioactive nuclear waste disposal site in China's nuclear power plants has been slow, and some problems need to be solved urgently, so it is necessary to speed up the construction of medium and low level radioactive nuclear waste disposal facilities. CONTENT OF THE UTILITY MODEL

[0003] To solve the problem of disposal of medium and low level radioactive nuclear waste, the utility model provides a cavern structure for disposal of medium and low level radioactive nuclear waste, which can effectively shield radiation and realize safe disposal and isolation of medium level waste.

[0004] The technical scheme adopted by the present application to solve its technical problems is: a cavern structure for nuclear waste disposal is constructed, the cavern structure is arranged in a rock stratum, the cavern structure comprises a sealed space surrounded by a base, an outer wall and a top cover, a plurality of partition walls are arranged in the sealed space, the base, the outer wall, the top cover and the partition walls are all reinforced concrete structures, the partition walls divide the sealed space into a plurality of compartments for accommodating nuclear waste, and gravel filling layers are arranged outside the outer wall and the top cover.

[0005] In some embodiments of the present application, the compartments include large compartments and small compartments.

[0006] In some embodiments of the present application, the volume L1 of the large compartments is more than twice the volume L2 of the small compartments.

[0007] In some embodiments of the present application, a formwork support rod is arranged in the partition wall.

[0008] In some embodiments of the present application, the formwork support rod comprises a plurality of vertical rods and a plurality of horizontal rods, at least one connecting block is arranged on each vertical rod, at least one connecting block is arranged at the top of each vertical rod, and the connecting blocks of adjacent vertical rods are connected by horizontal rods.

[0009] In some embodiments of the present application, a first support block is arranged at the bottom of the vertical rod.

[0010] In some embodiments of the present application, the connecting blocks are circumferential connecting blocks.

[0011] In some embodiments of the present application, a concrete layer is poured above the top cover.

[0012] In some embodiments of the present application, a water passing gap is arranged between the top cover and the concrete layer, and the height of the water passing gap is 0.5-10 cm.

[0013] The present application has at least the following beneficial effects: the cavern structure for nuclear waste disposal provided by the present application has several compartments, which can be used to place medium and low radioactive nuclear waste, and the compartments are provided with multiple barriers such as isolation walls, outer walls, top covers, gravel filling layers, etc., to realize safe storage and isolation of medium and low radioactive nuclear waste, effectively shield radiation, and ensure safety. BRIEF DESCRIPTION OF DRAWINGS

[0014] The present application will be further described below in conjunction with the drawings and embodiments, in which:

[0015] Figure 1 is a structural schematic diagram of the cavern structure for nuclear waste disposal provided by the present application;

[0016] Figure 2 is a structural schematic diagram of a formwork support rod.

[0017] EXPLANATION OF REFERENCE NUMBERS:

[0018] Base 1, outer wall 2, isolation wall 3, vertical rod 4, connecting block 41, first support block 42, large compartment 5, small compartment 6, top cover 7, concrete layer 8, gravel filling layer 9. DETAILED DESCRIPTION

[0019] In order to have a clearer understanding of the technical features, objects and effects of the present application, the specific embodiments of the present application will be described in detail with reference to the drawings. In the following description, a large number of specific details are set forth in order to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0020] In the description of the present application, it should be understood that the terms "longitudinal", "lateral", "upper", "lower", "top", "bottom", "inner", "outer" and the like refer to the orientation or position relationship shown in the drawings or the orientation or position relationship commonly used when the product of the present application is used, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0022] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above" the second feature can be directly above or obliquely above the second feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below" the second feature can be directly below or obliquely below the second feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0024] Reference Figure 1 and Figure 2 , Figure 1The hole structure for nuclear waste disposal provided in some embodiments of the present application is shown, which is arranged in a rock stratum, and the hole structure comprises a sealed space surrounded by a base 1, an outer wall 2 and a top cover 7, like a large box, wherein the base 1, the outer wall 2 and the top cover 7 are all reinforced concrete structures, the base 1 is established on a gravel leveled ground, the outer wall 2 is made of cast-in-place reinforced concrete, and the top cover 7 is a shotcrete lining to stabilize the rock in the operation stage. A plurality of partition walls 3 are arranged in the sealed space, the partition walls 3 are made of reinforced concrete, and there are steel bars and Figure 2 The template support rod shown in the drawing comprises a plurality of vertical rods 4 and a plurality of horizontal rods, at least one connecting block 41 is arranged on the vertical rod 4, the at least one connecting block 41 is arranged at the top of the vertical rod 4, the connecting blocks 41 of adjacent vertical rods 4 are connected by the horizontal rods, the connecting block 41 is a circumferential connecting block, and the connecting block 41 can connect the horizontal rods from multiple directions. A first support block 42 is arranged at the bottom of the vertical rod 4. The template support rod is used to keep the formwork in place when pouring the concrete wall, and prevent the concrete from collapsing or shifting. The partition wall 3 divides the sealed space into a plurality of compartments for accommodating nuclear waste, the compartments include a plurality of large compartments 5 and a plurality of small compartments 6, the volume L1 of the large compartment 5 is more than twice the volume L2 of the small compartment 6, the nuclear waste is placed in the compartment after being packaged in a container, and the concrete slurry is gradually poured into the gap in the compartment after the nuclear waste is placed, so as to limit the release of radionuclides in the nuclear waste. After all the compartments are filled, the top cover 7 is placed in position, and the top cover 7 provides radiation shielding and fire protection. Then a concrete layer 8 can also be cast on the top of the top cover 7 to prevent water intrusion in the operation stage, and a water gap is arranged between the top cover 7 and the concrete layer 8, the height of the water gap is 0.5-10 cm, so that the structure is more stable. In addition, a gravel filling layer 9 is arranged outside the outer wall 2 and the top cover 7, i.e. between the hole structure and the rock stratum and above the concrete layer 8, the above-mentioned space is backfilled with gravel, and a layer of barrier is added. Therefore, the whole hole structure of the present application has multiple layers of barriers, the innermost barrier is composed of containers containing nuclear waste, the second is the concrete grouting of the compartment and the partition wall 3, then the main body of the hole structure composed of the outer wall 2, the top cover 7 and the concrete layer 8, and finally the gravel filling layer 9. In addition, the rock stratum where the hole structure is located also constitutes a barrier. The radionuclides released by the nuclear waste inside the hole structure will be limited and adsorbed by the above-mentioned multiple layers of barriers, and the shielding effect can be effectively realized.

[0025] The hole structure of the present application can be applied to domestic nuclear power plants to dispose of medium and low level radioactive nuclear waste generated and accumulated during the operation of the nuclear power plant, and the whole hole structure comprises multiple layers of barriers, which can realize the safe storage and isolation of medium and low level radioactive nuclear waste, effectively shield radiation, and protect humans and biological groups.

[0026] The above examples only express the specific implementation of the present application, which is described in detail and specifically, but cannot be understood as the limitation of the patent scope of the present application; it should be pointed out that for ordinary skilled in the art, the above technical features can be freely combined without departing from the concept of the present application, and some modifications and improvements can be made, which belong to the protection scope of the present application; therefore, any equivalent transformation and modification within the scope of the claims of the present application shall belong to the scope of the claims of the present application.

Claims

1. A cavern structure for disposal of nuclear waste, characterized in that, The chamber structure is arranged in a rock stratum, and comprises a sealed space surrounded by a base (1), an outer wall (2) and a top cover (7), a plurality of partition walls (3) are arranged in the sealed space, the base (1), the outer wall (2), the top cover (7) and the partition walls (3) are all reinforced concrete structures, the partition walls (3) divide the sealed space into a plurality of compartments for accommodating nuclear waste, and gravel filling layers (9) are arranged outside the outer wall (2) and the top cover (7).

2. A cavern structure for nuclear waste disposal according to claim 1, characterized in that, The compartments comprise large compartments (5) and small compartments (6).

3. A cavern structure for nuclear waste disposal according to claim 2, characterized in that, The volume L1 of the large compartments (5) is more than twice the volume L2 of the small compartments (6).

4. The cavern structure for nuclear waste disposal according to claim 1, characterized in that, The partition walls (3) are provided with formwork support rods.

5. A cavern structure for nuclear waste disposal according to claim 4, characterized in that, The formwork support rods comprise a plurality of vertical rods (4) and a plurality of horizontal rods, at least one connecting block (41) is arranged on each vertical rod (4), at least one connecting block (41) is arranged at the top of each vertical rod (4), and the connecting blocks (41) of adjacent vertical rods (4) are connected by horizontal rods.

6. A cavern structure for nuclear waste disposal according to claim 5, characterized in that, First support blocks (42) are arranged at the bottom of each vertical rod (4).

7. The cavern structure for nuclear waste disposal according to claim 5, characterized in that, The connecting blocks (41) are circumferential connecting blocks.

8. The cavern structure for nuclear waste disposal according to claim 1, characterized in that, A concrete layer (8) is cast on top of the top cover (7).

9. A cavern structure for nuclear waste disposal according to claim 8, characterized in that, A water passing gap is arranged between the top cover (7) and the concrete layer (8), and the height of the water passing gap is 0.5-10 cm.

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