A pipe gallery structure for a low-level radioactive liquid effluent discharge line of a nuclear power plant

Abstract

The utility model provides a kind of pipe gallery structure of nuclear power plant low radioactive liquid effluent discharge pipeline, including pipe gallery body, radiation alarm device, manhole entrance section and cover plate, the inside of pipe gallery body is used to place discharge pipe, and the cross section of pipe gallery body along its extension direction is set as closed structure, it is favorable to avoid the discharge pipe located in the inside of pipe gallery body to occur low radioactive liquid effluent leakage, and leaked liquid effluent does not leak to environmental sensitive point;Radiation alarm device is arranged in pipe gallery body, for detecting the radiation level in pipe gallery body;Manhole entrance section is communicated with pipe gallery body, and manhole entrance section extends to ground and is provided with entrance, maintenance personnel can enter pipe gallery body through manhole entrance section to carry out maintenance to discharge pipe, it is favorable to improve the convenience of maintenance personnel to carry out maintenance to discharge pipe;Cover plate is arranged at the entrance of manhole entrance section to close manhole entrance section.

Description

Technical Field

[0001] This utility model relates to the field of liquid effluent treatment technology in nuclear power plants, and in particular to a pipe gallery structure for a discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant. Background Technology

[0002] Offshore nuclear power plant sites are located far from the coastline. Liquid effluents generated during normal operation are collected in storage facilities within the plant area and, after meeting emission standards, are discharged into receiving marine waters via long-distance land-based drainage pipelines. During this long-distance land transport, these pipelines often pass through environmentally sensitive areas such as residential areas, wells, rivers, farmland, orchards, and woodlands. To avoid or minimize the adverse impacts of nuclear power plant liquid effluents on these sensitive areas, it is necessary to consider defense-in-depth for the drainage pipelines to ensure no leakage. In the event of a leak, it is also essential to ensure that the liquid effluent does not leak into environmentally sensitive areas.

[0003] In related technologies, flow or pressure monitoring facilities are installed in drainage pipelines. When the monitoring indicates a pipeline rupture and leakage, discharge is immediately stopped, and then manual intervention is carried out on-site to handle the leaked liquid. For normal small-flow leakage in drainage pipelines that requires manual inspection, secondary excavation of the backfill soil for directly buried drainage pipelines is necessary. This process is inconvenient for manual inspection operations; moreover, repeated excavation and backfilling will inevitably cause adverse effects on the pipeline, further increasing the risk of leakage.

[0004] Therefore, a new solution is needed to address the aforementioned technical problems. Utility Model Content

[0005] This invention provides a pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant, in order to solve the technical problem of how to improve the convenience of manual maintenance while ensuring that the liquid effluent does not leak to environmentally sensitive points.

[0006] This utility model provides a pipe gallery structure for a low-radioactivity liquid effluent discharge pipeline in a nuclear power plant. The pipe gallery structure includes a pipe gallery body, a radiation alarm device, a manhole inlet section, and a cover plate. The cross-section of the pipe gallery body along its extension direction is set as a closed structure, and the interior of the pipe gallery body is used to house the discharge pipe. The radiation alarm device is installed in the pipe gallery body and is used to detect the radiation level inside the pipe gallery body. The manhole inlet section is connected to the pipe gallery body and extends to the ground with an entrance. The cover plate is installed at the entrance of the manhole inlet section to close the manhole inlet section.

[0007] In one embodiment of this utility model, a maintenance space is provided between the side of the pipe gallery body near the manhole entrance section and the discharge pipe.

[0008] In one embodiment of this utility model, a ladder is provided inside the manhole entrance section.

[0009] In one embodiment of the present invention, multiple manhole entrance sections are provided and are spaced apart along the extension direction of the pipe gallery body.

[0010] In one embodiment of the present invention, multiple radiation alarm devices are provided and are spaced apart along the extension direction of the pipe gallery body.

[0011] In one embodiment of the present invention, a support seat is provided on the bottom surface of the pipe gallery body, and the discharge pipe is placed on the support seat.

[0012] In one embodiment of the present invention, a support member is connected to the support base, and the discharge pipe is clamped between the support base and the support member.

[0013] In one embodiment of the present invention, a transition section is provided between the pipe gallery body and the manhole entrance section, the height of the transition section is greater than or equal to 2m, and the upper side of the inner wall of the pipe gallery body is higher than the upper side of the inner wall of the transition section.

[0014] In one embodiment of this utility model, the pipe gallery body, the manhole entrance section, and the transition section are all made of concrete.

[0015] In one embodiment of the present invention, the bottom outer walls of the pipe gallery body, the manhole entrance section and the transition section are flush, and the bottom outer wall is provided with a plain concrete pad layer.

[0016] The beneficial effects of this utility model are as follows: The utility model proposes a pipe gallery structure for the discharge pipeline of low-radioactive liquid effluent in nuclear power plants. By setting the cross-section of the pipe gallery body along its own extension direction as a closed structure, it is beneficial to prevent the leakage of low-radioactive liquid effluent into environmentally sensitive points when the discharge pipe located inside the pipe gallery body leaks. In addition, the pipe gallery body is connected to the manhole entrance section extending to the ground. When the radiation alarm device inside the pipe gallery body detects that the radiation level inside the pipe gallery body is higher than the radiation threshold, maintenance personnel can enter the pipe gallery body through the manhole entrance section to inspect the discharge pipe, which is beneficial to improving the convenience of maintenance personnel to inspect the discharge pipe. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] In the attached diagram: Figure 1 A cross-sectional view of the pipe gallery structure of a nuclear power plant low-radioactive liquid effluent discharge pipeline provided in an embodiment of this utility model; Figure 2 This is a cross-sectional view of the pipe gallery body provided in one embodiment of the present invention.

[0019] The attached figures are labeled as follows: 1-Pipe gallery body; 2-Radiation alarm device; 3-Manhole entrance section; 31-Entrance; 4-Cover plate; 5-Ladder; 6-Drainage pipe; 7-Ground; 8-Transition section; 9-Plain concrete cushion layer; 10-Support seat; 11-Support component. Detailed Implementation

[0020] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0022] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0023] Please see Figure 1 and Figure 2An embodiment of this utility model provides a pipe gallery structure for a nuclear power plant's low-radioactivity liquid effluent discharge pipeline, including a pipe gallery body 1, a radiation alarm device 2, a manhole inlet section 3, and a cover plate 4.

[0024] It should be noted that, considering defense in depth, the main body of the utility tunnel 1 is buried deep underground, and its extension direction is set according to the planned discharge path of the low-radioactive liquid effluent. The interior of the utility tunnel 1 is used to house the discharge pipe 6, and the cross-section of the utility tunnel 1 along its extension direction is set as a closed structure, which helps to prevent the leakage of liquid effluent from the discharge pipe 6 located inside the utility tunnel 1 from leaking to environmentally sensitive points.

[0025] For example, the discharge pipe 6 is a solid-walled pipe, and the pipe material can be high-density polyethylene (HDPE) to prevent the discharge pipe 6 from being corroded by the liquid effluent, thereby preventing the liquid effluent from leaking.

[0026] When the radiation alarm device 2 installed inside the pipe gallery body 1 detects that the radiation level inside the pipe gallery body 1 is equal to or greater than the radiation threshold, the radiation alarm device 2 will remotely alarm, so that the discharge end of the liquid effluent will immediately stop discharging the liquid effluent. After manual maintenance conditions are met inside the pipe gallery body 1, that is, when the radiation alarm device 2 detects that the radiation level inside the pipe gallery body 1 is less than or equal to the radiation safety value, it will notify maintenance personnel to repair the leaking discharge pipe 6. For example, the radiation alarm device 2 can be installed on the side wall of the pipe gallery body 1, located near the discharge pipe 6. The radiation alarm device 2 includes, but is not limited to, being an online radiation safety alarm.

[0027] In one example, multiple radiation alarm devices 2 are installed inside the pipe gallery body 1, and the multiple radiation alarm devices 2 are spaced apart along the extension direction of the pipe gallery body 1. For example, the spacing between two adjacent radiation alarm devices 2 can be set to 50m~100m.

[0028] Manhole entrance section 3 is connected to the main body of the utility tunnel 1 and extends to the ground level 7. The manhole entrance section 3 located at the ground level 7 has an entrance 31. During maintenance, after making radiation protection preparations, maintenance personnel can enter the main body of the utility tunnel 1 through the entrance 31 of the manhole entrance section 3 to carry out maintenance work on the discharge pipe 6, avoiding secondary excavation of the soil covering the discharge pipe 6 and improving the convenience of maintenance personnel in maintaining the discharge pipe 6.

[0029] In some embodiments, to facilitate maintenance personnel entering the utility tunnel body 1 from the entrance 31 of the manhole entrance section 3 located on the ground 7, a ladder 5 is provided in the manhole entrance section 3. It should be noted that the ladder 5 extends all the way to the bottom surface of the utility tunnel structure.

[0030] A cover plate 4 is installed at the entrance 31 of the manhole entrance section 3. When the radiation alarm device 2 does not detect that the radiation level inside the pipe gallery body 1 is higher than the radiation threshold, the cover plate 4 is normally closed to prevent outside personnel from accidentally entering.

[0031] In one example, multiple manhole entrance sections 3 are provided, and the multiple manhole entrance sections 3 are spaced apart along the extension direction of the pipe gallery body 1. For example, the distance between two adjacent manhole entrance sections 3 can be set to 500m.

[0032] In some embodiments, in the event of a liquid leak, a transition section 8 is provided between the pipe gallery body 1 and the manhole inlet section 3 to extend the radiation path of the liquid. To facilitate maintenance personnel entering the pipe gallery body 1 from the manhole inlet section 3, the height of the transition section 8 is set to be greater than or equal to 2m, so that maintenance personnel can walk upright.

[0033] Furthermore, to facilitate maintenance operations by maintenance personnel within the main body of the utility tunnel 1, the upper inner wall of the main body of the utility tunnel 1 is higher than the upper inner wall of the transition section 8.

[0034] In one example, in order to facilitate maintenance personnel to carry out maintenance operations inside the pipe gallery body 1, a maintenance space is provided between the side of the pipe gallery body 1 near the manhole entrance section 3 and the discharge pipe 6, so that maintenance personnel can carry out maintenance on the discharge pipe 6 in the maintenance space.

[0035] For example, to resist radiation after leakage of liquid effluent, the main body 1 of the utility tunnel, the manhole inlet section 3, and the transition section 8 are all made of concrete. Furthermore, concrete structures have strong impermeability, which helps prevent leaked liquid effluent from seeping outside the utility tunnel structure.

[0036] In one example, the bottom outer walls of the utility tunnel body 1, the manhole entrance section 3, and the transition section 8 are flush. To protect the foundation and improve its stress conditions, a plain concrete cushion layer 9 is provided on the bottom outer walls of the utility tunnel body 1, the manhole entrance section 3, and the transition section 8.

[0037] In some embodiments, in order to ensure the horizontality of the discharge pipe 6 in the extension direction and facilitate the flow of liquid effluent in the discharge pipe 6, a support seat 10 is provided on the bottom surface of the pipe gallery body 1, and the discharge pipe 6 is placed on the support seat 10.

[0038] In one example, in order to support and fix the discharge pipe 6 placed on the support 10, a support member 11 is installed on the support 10 by bolts or the like, and the discharge pipe 6 is sandwiched between the support 10 and the support member 11.

[0039] In summary, the utility model proposes a pipe gallery structure for the discharge pipeline of low-radioactive liquid effluent in nuclear power plants. By setting the cross-section of the pipe gallery body along its extension direction as a closed structure, it helps to prevent the leakage of low-radioactive liquid effluent into environmentally sensitive areas when leakage occurs in the discharge pipe located inside the pipe gallery body. Furthermore, the pipe gallery body is connected to the manhole entrance section extending to the ground. When the radiation alarm device inside the pipe gallery body detects that the radiation level inside the pipe gallery body is higher than the radiation threshold, maintenance personnel can enter the pipe gallery body through the manhole entrance section to inspect the discharge pipe, which improves the convenience of maintenance personnel in inspecting the discharge pipe.

[0040] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A pipe gallery structure for a low-radioactivity liquid effluent discharge pipeline in a nuclear power plant, characterized in that, include: The pipe gallery body has a closed cross-section along its extension direction, and the interior of the pipe gallery body is used to house the discharge pipe; A radiation alarm device is installed inside the pipe gallery to detect the radiation level inside the pipe gallery. The manhole entrance section is connected to the main body of the pipe gallery, and the manhole entrance section extends to the ground and has an entrance; A cover plate is provided at the entrance of the manhole entrance section to close the manhole entrance section.

2. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 1, characterized in that: An inspection space is provided inside the pipe gallery body on the side near the manhole entrance section and between it and the discharge pipe.

3. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 1, characterized in that: A ladder is installed inside the manhole entrance section.

4. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 3, characterized in that: Multiple manhole entrance sections are provided and are spaced apart along the extension direction of the pipe gallery body.

5. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 1, characterized in that: Multiple radiation alarm devices are provided and are spaced apart along the extension direction of the pipe gallery body.

6. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 1, characterized in that: The bottom surface of the pipe gallery body is provided with a support base, and the discharge pipe is placed on the support base.

7. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 6, characterized in that: A support member is connected to the support base, and the discharge pipe is clamped between the support base and the support member.

8. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to any one of claims 1-7, characterized in that: A transition section is provided between the main body of the utility tunnel and the manhole entrance section. The height of the transition section is greater than or equal to 2m, and the upper inner wall of the main body of the utility tunnel is higher than the upper inner wall of the transition section.

9. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 8, characterized in that: The main body of the utility tunnel, the manhole entrance section, and the transition section are all constructed of concrete.

10. The pipe gallery structure for the discharge pipeline of low-radioactivity liquid effluent from a nuclear power plant according to claim 9, characterized in that: The bottom outer walls of the utility tunnel body, the manhole entrance section, and the transition section are flush, and the bottom outer wall is provided with a plain concrete pad.

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