Plug for closing nuclear waste disposal cavern

Abstract

The utility model relates to a plug for sealing a nuclear waste disposal cavern, the plug is inserted into the disposal cavern along a first direction, and the plug comprises a first backfilling section, a first supporting section, a hydraulic sealing section, a second supporting section and a second backfilling section which are arranged in sequence; the first backfilling section is arranged at the far end of the plug bolt in the first direction, and the second backfilling section is arranged at the near end of the plug bolt in the first direction; the hydraulic sealing section is made of bentonite materials in a filling mode. The first bearing section and the second bearing section clamp the hydraulic sealing section so as to provide mechanical support for the hydraulic sealing section. The first backfill section and the second backfill section are filled with gravel materials. The plug for sealing the nuclear waste disposal cavern can be applied to underground nuclear waste disposal facilities of a nuclear power station, foreign objects are prevented from intruding into the disposal cavern unintentionally, the shielding effect is improved, water permeation and erosion are reduced to the maximum extent, safety is greatly improved, the requirement for long-term safety is met, and the application prospect is wide. And a protection effect is achieved on human beings and biological groups.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear waste treatment, and more particularly, to a plug for closing a nuclear waste disposal cavity. BACKGROUND

[0002] Since 2005, China has built dozens of pressurized water reactor nuclear power plants in batches, and China's nuclear power has entered a stage of active and rapid development. With the rapid development of China's nuclear power industry, the number of under-construction and in-operation units is gradually increasing, so the medium and low radioactive nuclear waste generated and accumulated during the operation of nuclear power plants will increase, and nuclear waste disposal facilities need to be built faster.

[0003] Existing nuclear waste disposal facilities generally set disposal cavities in underground rock layers, and the disposal cavities are used to place medium and low radioactive nuclear waste, and the closure of the disposal cavity is the last main step to complete the nuclear waste treatment. Since the entire nuclear waste disposal facility aims to isolate radioactive nuclear waste and other harmful components for a long enough time, it is necessary to close the disposal cavity, reduce water penetration and erosion, and minimize unintentional intrusion into the disposal cavity to reduce the risk to humans and the biological population. CONTENT OF THE UTILITY MODEL

[0004] To solve the problem of closing the nuclear waste disposal cavity in the prior art, the present application provides a plug for closing a nuclear waste disposal cavity, which can safely and effectively achieve the closure of the disposal cavity.

[0005] The technical solution adopted by the present application to solve its technical problems is: a plug for closing a nuclear waste disposal cavity is constructed, the plug is inserted into the disposal cavity along a first direction, the plug includes a first backfill section, a first support section, a hydraulic sealing section, a second support section, and a second backfill section arranged in sequence; the first backfill section is arranged at the distal end of the plug along the first direction, and the second backfill section is arranged at the proximal end of the plug along the first direction; the hydraulic sealing section is made of bentonite material filling; the first support section and the second support section clamp the hydraulic sealing section to provide mechanical support for the hydraulic sealing section; the first backfill section and the second backfill section are composed of gravel material filling.

[0006] In some embodiments, the first support section includes a first concrete filling section and a first support wall section.

[0007] In some embodiments, the first support wall section is arranged in close proximity to the hydraulic sealing section, and the first concrete filling section is located between the first support wall section and the first backfill section.

[0008] In some embodiments, the second support section includes a second concrete filling section and a second support wall section.

[0009] In some embodiments, the second concrete filling section is arranged close to the hydraulic sealing section, and the second supporting wall section is arranged between the second concrete filling section and the second backfill section.

[0010] In some embodiments, the first backfill section is provided with an isolation section on the side away from the first supporting section.

[0011] In some embodiments, the isolation section is a concrete layer.

[0012] The plug for closing a nuclear waste disposal cavern provided by the present application can be applied to a nuclear waste disposal facility in the underground of a nuclear power plant. The plug is used to close the disposal cavern, to achieve the closure of the disposal cavern, to prevent the disposal cavern from being inadvertently intruded by external objects, and to greatly improve the safety. Most of the radioactive nuclides released from the nuclear waste in the disposal cavern will be limited by the adsorption of the material constituting the plug, i.e., the plug improves the shielding effect and ensures the safety. At the same time, the hydraulic sealing section filled with bentonite material can minimize water penetration and erosion, and can meet the long-term safety requirements. The plug for closing a nuclear waste disposal cavern provided by the present application can safely and effectively achieve the closure of the disposal cavern, and plays a protective role for humans and biological groups. BRIEF DESCRIPTION OF DRAWINGS

[0013] The present application will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0014] Figure 1 is a structural schematic diagram of the plug for closing a nuclear waste disposal cavern in some embodiments of the present application.

[0015] EXPLANATION OF REFERENCE NUMBERS:

[0016] The first backfill section 100, the first supporting section 200, the first concrete filling section 210, the first supporting wall section 220, the hydraulic sealing section 300, the second supporting section 400, the second concrete filling section 410, the second supporting wall section 420, the second backfill section 500, and the isolation section 600. DETAILED DESCRIPTION

[0017] In order to have a clearer understanding of the technical features, objectives 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 thorough 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.

[0018] In the description of the application, it needs to be understood that the terms "longitudinal", "transverse", "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship commonly used when the product of the application is used, and are only for the convenience of describing the application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0019] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0020] In this application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, 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 application can be understood according to the specific circumstances.

[0021] In this 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 simply 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 simply indicate that the first feature is lower than the second feature in horizontal height.

[0022] Reference Figure 1 , Figure 1 The plug for closing the nuclear waste disposal cavity provided in some embodiments of the application is shown. In use, the plug is inserted into the disposal cavity along a first direction X, the plug of the present embodiment is placed vertically to close the disposal cavity, and the end of the plug used to enter the disposal cavity is the proximal end, such as the lower end in Figure 1 , and the end of the plug away from the disposal cavity is the distal end, such as the upper end in Figure 1The plug includes a first backfill section 100, a first support section 200, a hydraulic sealing section 300, a second support section 400 and a second backfill section 500 arranged in sequence. The first backfill section 100 is arranged at the distal end of the plug along the first direction X, and the second backfill section 500 is arranged at the proximal end of the plug along the first direction X. The hydraulic sealing section 300 is located in the middle, and the hydraulic sealing section 300 is made of bentonite material and has excellent compactness and long-lasting waterproof performance. The hydraulic sealing section 300 plays a role in hydraulic sealing, thereby minimizing water penetration and erosion. The first support section 200 and the second support section 400 are arranged on both sides of the hydraulic sealing section 300, i.e., the first support section 200 and the second support section 400 clamp the hydraulic sealing section 300 to provide mechanical support for the hydraulic sealing section 300. Specifically, the first support section 200 includes a first concrete filling section 210 and a first support wall section 220, and the first support wall section 220 is arranged in close proximity to the hydraulic sealing section 300. The first concrete filling section 210 is located between the first support wall section 220 and the first backfill section 100. The second support section 400 includes a second concrete filling section 410 and a second support wall section 420, and the second concrete filling section 410 is arranged in close proximity to the hydraulic sealing section 300. The second support wall section 420 is located between the second concrete filling section 410 and the second backfill section 500. In this embodiment, the support wall sections in the first support section 200 and the second support section 400 are located below the concrete filling sections, which can achieve a better support structure. The first backfill section 100 and the second backfill section 500 are composed of gravel material, which has the required high permeability and good mechanical properties to limit the settlement in the tunnel and enhance the long-term stability of the tunnel. The side of the first backfill section 100 away from the first support section 200 is provided with a separation section 600, i.e., the separation section 600 is located at the uppermost end of the plug away from the disposal cavern. The separation section 600 is a concrete layer, which can prevent external objects from inadvertently entering the disposal cavern. In addition, it is easily conceivable that in some alternative embodiments, the plug can also be placed horizontally, in which case the left and right sides of the hydraulic sealing section 300 are provided with support sections, and the outermost end of the plug away from the disposal cavern is provided with a separation section 600.

[0023] The utility model discloses can be applied to the nuclear waste disposal facility in the underground nuclear power station, the plug is used to close disposal chamber, realizes the closing of disposal chamber. After the closing of disposal chamber, the plug can prevent the intrusion of external object into disposal chamber by accident, and the safety is greatly improved. Most of the radionuclide released from the nuclear waste in the disposal chamber will be adsorbed and limited by the bentonite material, the concrete plug and the gravel material, that is, the plug further improves the shielding effect and guarantees the safety. Meanwhile, the hydraulic sealing section 300 filled with the bentonite material can greatly reduce the water permeation and erosion, and can meet the long-term safety requirement. The plug for closing the nuclear waste disposal chamber can safely and effectively realize the closing of disposal chamber, and plays a protective role on human beings and biological groups.

[0024] The above embodiments only express the specific implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as the limitation on the patent scope of the present application. It should be pointed out that the above technical features can be freely combined without departing from the concept of the present application, and several modifications and improvements can be made, which all 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 should belong to the coverage of the claims of the present application.

Claims

1. A plug for sealing a nuclear waste disposal chamber, the plug being inserted into the disposal chamber along a first direction, characterized in that, The plug includes a first backfill section (100), a first support section (200), a hydraulic sealing section (300), a second support section (400), and a second backfill section (500) arranged sequentially. The first backfill section (100) is disposed at the distal end of the plug along a first direction, and the second backfill section (500) is disposed at the proximal end of the plug along a first direction; The hydraulic sealing section (300) is made of bentonite material; the first support section (200) and the second support section (400) clamp the hydraulic sealing section (300) to provide mechanical support for the hydraulic sealing section (300); the first backfill section (100) and the second backfill section (500) are made of gravel material.

2. The plug for sealing nuclear waste disposal chambers according to claim 1, characterized in that, The first support section (200) includes a first concrete filling section (210) and a first support wall section (220).

3. The plug for sealing nuclear waste disposal chambers according to claim 2, characterized in that, The first supporting wall section (220) is set close to the hydraulic sealing section (300), and the first concrete filling section (210) is located between the first supporting wall section (220) and the first backfill section (100).

4. The plug for sealing nuclear waste disposal chambers according to claim 1, characterized in that, The second support section (400) includes a second concrete filling section (410) and a second support wall section (420).

5. The plug for sealing nuclear waste disposal chambers according to claim 4, characterized in that, The second concrete filling section (410) is set close to the hydraulic sealing section (300), and the second supporting wall section (420) is located between the second concrete filling section (410) and the second backfill section (500).

6. The plug for sealing nuclear waste disposal chambers according to claim 3, characterized in that, An isolation section (600) is provided on the side of the first backfill section (100) away from the first support section (200).

7. The plug for sealing nuclear waste disposal chambers according to claim 6, characterized in that, The isolation section (600) is a concrete layer.

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