Cooling system for a nuclear reactor outlet measurement channel

Abstract

The utility model discloses a cooling system for nuclear reactor outside measurement channel, it includes channel bushing, air interlayer, bushing export pipeline, bushing import pipeline and water tank body. The cooling system forms natural circulation through setting water tank body, bushing export pipeline, bushing import pipeline and channel bushing. Through natural circulation, the cooling nuclear reactor outside measurement channel prevents high temperature layer heating measurement channel to lead to nuclear reactor outside measurement channel internal cable performance reduction even failure problem. Utilize passive natural circulation cooling nuclear reactor outside measurement channel, avoided the problem that material heat insulation performance and mechanical property are difficult to synchronous promotion, simultaneously, passive same natural circulation loop technology is ripe, avoided the high manufacturing cost that complicated cable outer package heat insulation material technology brought, passive natural circulation cooling loop setting is relatively simple, and maintenance is convenient. And still through setting air interlayer, play the role of further protection cable.

Description

Technical Field

[0001] This utility model relates to the field of nuclear reactor cooling technology, and in particular to a cooling system for external measurement channels of nuclear reactors. Background Technology

[0002] To ensure the controllable and normal operation of the reactor, nuclear power plants must monitor the reactor core power. Nuclear power plants employ protection and safety monitoring systems to monitor and control reactor power, with the external measurement system (EMS), a subsystem of the protection and safety monitoring system, responsible for monitoring reactor power.

[0003] The external nuclear measurement instruments of the nuclear reactor external measurement system are installed around the reactor core, which causes some measurement channel cables to be exposed to the high temperature conditions of the reactor. The high temperature environment causes aging of the cables, resulting in degradation of the cable insulation material and reduction of insulation performance, ultimately leading to the loss of power supply and communication capabilities of the measurement channels.

[0004] In general online cable engineering, it is common practice to wrap the outside of the cable with heat insulation material. However, it is difficult to improve the heat insulation performance and mechanical properties of the heat insulation material at the same time. In addition, the process of wrapping the cable with heat insulation material is complicated and difficult to maintain.

[0005] In industry, active equipment such as air cooling and water cooling devices are often used to cool and dissipate heat from cables. However, active equipment relies on power supply and manual operation, and cannot guarantee cable cooling in the event of power failure or human error, resulting in low system reliability. Utility Model Content

[0006] The technical problem to be solved by this invention is to provide a cooling system for a measurement channel outside a nuclear reactor.

[0007] The technical solution adopted by this utility model to solve its technical problem is: to construct a cooling system for the external measurement channel of a nuclear reactor, wherein a high-temperature layer is provided in the circumferential direction of the external measurement channel of the nuclear reactor, which includes a channel sleeve, an air gap, a sleeve outlet pipe, a sleeve inlet pipe and a water tank body.

[0008] The channel sleeve wraps around the outside of the external measurement channel of the nuclear reactor and is located inside the high-temperature layer. The air gap is set between the channel sleeve and the external measurement channel of the nuclear reactor. The two ends of the sleeve outlet pipe are respectively connected to the water inlet of the water tank body and the top of the channel sleeve. The two ends of the sleeve inlet pipe are respectively connected to the water outlet of the water tank body and the bottom of the channel sleeve. The top of the water tank body is connected to the external atmosphere. The installation height of the water tank body is higher than the top of the channel sleeve.

[0009] In some embodiments, an outlet control valve is provided on the casing outlet pipe.

[0010] In some embodiments, an inlet control valve is provided on the casing inlet pipe.

[0011] In some embodiments, an inlet check valve is provided on the casing inlet pipe.

[0012] In some embodiments, a heat insulation layer is provided on the high-temperature layer.

[0013] In some embodiments, the cooling system further includes a temperature sensor disposed within a measurement channel outside the nuclear reactor.

[0014] In some embodiments, a liquid level sensor is provided inside the water tank.

[0015] In some embodiments, the cooling system further includes a controller.

[0016] In some embodiments, the air gap is filled with thermal insulation material.

[0017] In some embodiments, both the casing outlet pipe and the casing inlet pipe are connected to the water tank body via quick couplings.

[0018] The present invention offers the following advantages: The cooling system, through the configuration of a water tank body, a sleeve outlet pipe, a sleeve inlet pipe, and a channel sleeve, forms a natural circulation. This natural circulation cools the external measurement channel of the nuclear reactor, preventing the high-temperature layer from heating the measurement channel and causing a decrease in the performance or even failure of the internal cables. Utilizing passive natural circulation to cool the external measurement channel avoids the problem of simultaneously improving the thermal insulation and mechanical properties of materials. Furthermore, the passive natural circulation loop technology is mature, avoiding the high manufacturing costs associated with complex cable insulation material processes. The passive natural circulation cooling loop is relatively simple to set up and easy to maintain. Additionally, the inclusion of an air gap further protects the cables. Attached Figure Description

[0019] To more clearly illustrate the technical solution of this utility model, the present utility model will be further described below in conjunction with the accompanying drawings and embodiments. It should be understood that the following drawings only show some embodiments of this utility model and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort. In the drawings:

[0020] Figure 1 This is a schematic diagram of the overall structure of the cooling system for the external measurement channel of a nuclear reactor in some embodiments of this utility model. Detailed Implementation

[0021] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the orientations or positional relationships indicated by terms such as "front," "rear," "upper," "lower," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inner," "outer," "head," and "tail" are based on the orientations or positional relationships shown in the accompanying drawings, and are constructed and operated in a specific orientation. They are only for the convenience of describing this technical solution and do not indicate that the device or component referred to must have a specific orientation; therefore, they should not be construed as limitations on this utility model.

[0022] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. When an component is referred to as being "on" or "below" another component, the component can be located "directly" or "indirectly" on the other component, or there may be one or more intermediary components. The terms "first," "second," "third," etc., are only for the convenience of describing this technical solution and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first," "second," "third," etc., may explicitly or implicitly include one or more of that feature. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0023] Please see Figure 1 This is a cooling system for an external measurement channel of a nuclear reactor, as described in some embodiments of the present invention. The external measurement channel 1 has a high-temperature layer 2 arranged circumferentially, which includes a channel sleeve 3, an air gap 4, a sleeve outlet pipe 5, a sleeve inlet pipe 6, and a water tank body 7. The channel sleeve 3 wraps around the outside of the external measurement channel 1 and is located inside the high-temperature layer 2. The air gap 4 is disposed between the channel sleeve 3 and the external measurement channel 1. The two ends of the sleeve outlet pipe 5 are respectively connected to the water inlet of the water tank body 7 and the top of the channel sleeve 3. The two ends of the sleeve inlet pipe 6 are respectively connected to the water outlet of the water tank body 7 and the bottom of the channel sleeve 3. The top of the water tank body 7 is open to the external atmosphere, and the height of the water tank body 7 is higher than the top of the channel sleeve 3.

[0024] Specifically, cables are installed inside the external measurement channel 1 of the nuclear reactor. Some of these cables are exposed to the high temperatures of the reactor, leading to aging. Therefore, in this embodiment, a channel sleeve 3 is installed between the external measurement channel 1 and the high-temperature layer 2. The channel sleeve 3 is an annular pipe encompassing the outer layer of the external measurement channel 1, and the liquid water flowing through this sleeve 3 cools the external measurement channel 1. Simultaneously, an air gap 4 is installed between the channel sleeve 3 and the external measurement channel 1. The air gap 4 can be filled with insulating materials such as fiberglass or asbestos. This air gap 4, due to its lower thermal conductivity compared to the fluid media water and metal, further protects the cables. Additionally, the water inlet of the water tank body 7 is located on the side wall of the water tank body 7, and the water outlet of the water tank body 7 is located at the bottom of the water tank body 7. The water tank body 7, the sleeve outlet pipe 5, the sleeve inlet pipe 6, and the channel sleeve 3 are all filled with liquid water. A heat insulation layer 21 is provided on the high-temperature layer 2, which is used to keep the high-temperature layer 2 warm.

[0025] The specific working principle of the cooling system for the external measurement channel of the nuclear reactor is as follows: The high-temperature layer 2 heats the liquid water in the channel sleeve 3 through heat transfer. As the temperature of the liquid water in the channel sleeve 3 increases and its density decreases, a density difference occurs on both sides, causing flow. At this time, the water in the channel sleeve 3 enters the water tank body 7 along the sleeve outlet pipe 5. Since the water tank body 7 is connected to the external atmosphere, the water in the water tank body 7 is cooled. Under the action of gravity, the cooling water enters the channel sleeve 3 along the sleeve inlet pipe 6, forming a natural circulation. Through natural circulation, the external measurement channel 1 of the nuclear reactor is cooled. That is, the cooling system for the external measurement channel of the nuclear reactor carries away the heat generated by the high-temperature layer 2, i.e., the reactor core, preventing the high-temperature layer 2 from heating the external measurement channel 1 and causing the internal cables of the external measurement channel 1 to degrade in performance or even fail. By utilizing passive natural circulation cooling of the external measurement channel 1 of the nuclear reactor, the problem of simultaneously improving the thermal insulation and mechanical properties of materials is avoided. Furthermore, the passive natural circulation loop technology is mature, avoiding the high manufacturing costs associated with complex cable insulation processes. In addition, the passive natural circulation cooling loop is relatively simple to set up and easy to maintain. Moreover, compared to commonly used active air-cooling and active water-cooling systems, this passive cooling system can operate autonomously without external energy or human intervention, better responding to emergencies, improving cooling reliability, and reducing losses due to human error. It avoids the problems of slow cooling rates and low reliability associated with active air-cooling and active water-cooling systems.

[0026] Understandably, the water tank body 7, the sleeve outlet pipe 5, the sleeve inlet pipe 6, and the channel sleeve 3 are facilities that are easy to manufacture and maintain, using readily available water as the medium, resulting in low manufacturing and maintenance costs. This cooling system forms a natural circulation by configuring the water tank body 7, sleeve outlet pipe 5, sleeve inlet pipe 6, and channel sleeve 3. Through natural circulation, the external measurement channel 1 of the nuclear reactor is cooled, preventing the high-temperature layer 2 from heating the measurement channel and causing a decrease in the performance of the internal cables of the external measurement channel 1, or even failure. Utilizing passive natural circulation to cool the external measurement channel 1 avoids the problem of simultaneously improving the thermal insulation and mechanical properties of materials. Furthermore, the passive natural circulation loop technology is mature, avoiding the high manufacturing costs associated with complex cable insulation material processes. The passive natural circulation cooling loop is relatively simple to configure and easy to maintain. Additionally, the inclusion of an air gap 4 further protects the cables.

[0027] Furthermore, an outlet control valve 51 is provided on the casing outlet pipe 5 to control the flow of water in the casing outlet pipe 5. An inlet control valve 61 is provided on the casing inlet pipe 6 to control the flow of water in the casing inlet pipe 6. An inlet check valve 62 is provided on the casing inlet pipe 6 to prevent backflow of water in the casing inlet pipe 6.

[0028] The cooling system also includes a temperature sensor installed in the measurement channel outside the nuclear reactor to detect the temperature within the measurement channel. A level sensor is installed inside the water tank body 7 to detect the liquid level inside the water tank body 7; if the liquid level in the water tank body 7 is insufficient, water can be added in a timely manner.

[0029] The cooling system for the external measurement channel of the nuclear reactor also includes a controller that can communicate with the aforementioned outlet control valve 51, inlet control valve 61, temperature sensor, and liquid level sensor to process parameter information during the operation of the cooling system of the external measurement channel 1 of the nuclear reactor and control the opening and closing of each control valve.

[0030] In addition, both the casing outlet pipe 5 and the casing inlet pipe 6 are connected to the water tank body 7 via quick connectors to facilitate connection.

[0031] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A cooling system for an external measurement channel of a nuclear reactor, wherein a high-temperature layer (2) is provided in the circumferential direction of the external measurement channel (1), characterized in that, It includes a channel sleeve (3), an air gap (4), a sleeve outlet pipe (5), a sleeve inlet pipe (6), and a water tank body (7); The channel sleeve (3) is wrapped around the outside of the nuclear reactor external measurement channel (1), and the channel sleeve (3) is located inside the high temperature layer (2). The air gap (4) is set between the channel sleeve (3) and the nuclear reactor external measurement channel (1). The two ends of the sleeve outlet pipe (5) are respectively connected to the water inlet of the water tank body (7) and the top of the channel sleeve (3). The two ends of the sleeve inlet pipe (6) are respectively connected to the water outlet of the water tank body (7) and the bottom of the channel sleeve (3). The top of the water tank body (7) is connected to the outside atmospheric environment. The installation height of the water tank body (7) is higher than the top of the channel sleeve (3).

2. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, An outlet control valve (51) is provided on the casing outlet pipe (5).

3. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, An inlet control valve (61) is provided on the inlet pipe (6) of the casing.

4. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, An inlet check valve (62) is provided on the inlet pipe (6) of the casing.

5. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, A heat insulation layer (21) is provided on the high temperature layer (2).

6. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, The cooling system also includes temperature sensors located in the measurement channel outside the nuclear reactor.

7. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, The water tank body (7) is equipped with a liquid level sensor.

8. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, The cooling system also includes a controller.

9. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, The air gap (4) is filled with heat insulation material.

10. The cooling system for an external measurement channel of a nuclear reactor according to claim 1, characterized in that, The casing outlet pipe (5) and the casing inlet pipe (6) are both connected to the water tank body (7) via quick connectors.

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