Nuclear power plant radioactive control area negative pressure centralized monitoring device

Abstract

The present application relates to a kind of nuclear power plant radioactive control area negative pressure centralized monitoring device, including at least one detection piece, buffer component and pipeline, pipeline includes main pipe and at least one branch pipe, each detection piece one end is connected with a control area through branch pipe, each detection piece other end is connected with main pipe through branch pipe, buffer component is set on main pipe, detection piece and buffer component are set indoors, main pipe one end accesses outside, detection piece is used to detect the pressure difference of control area and outside, buffer component is used to filter outside atmospheric fluctuation.This device can filter out outside atmospheric fluctuation, avoid detection piece to be disturbed by external environment influence, to improve the accuracy of detection piece, so that ventilation purification system can accurately adjust the amount of air supply, ensure that ventilation purification system stable operation, maintain the negative pressure stability in control area, while this device can also reduce the number of control area outer wall opening, to reduce the influence of outer wall opening on the sealing of control area.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of nuclear power plant nuclear level instrument control equipment, more particularly, to a negative pressure centralized monitoring device for a radioactive control area of a nuclear power plant. BACKGROUND

[0002] During normal and accident operation of a nuclear power plant, the radioactive control area of each nuclear island plant of the nuclear power plant needs to maintain a certain negative pressure relative to the outdoor environment to achieve dynamic containment control of airborne radioactive substances and prevent uncontrolled leakage and discharge of airborne radioactive substances.

[0003] The negative pressure maintenance function of the radioactive control area of each plant is mainly achieved by monitoring the pressure difference between the area and the outdoor atmosphere and adjusting the supply and exhaust air volume of the ventilation and purification system according to the pressure difference signal. The outdoor atmospheric pressure point of the control area negative pressure monitoring instrument is affected by atmospheric fluctuations (such as outdoor wind). Since the negative pressure maintained by the control area is only-100Pa, which is comparable to the pressure change caused by outdoor atmospheric fluctuations, outdoor atmospheric fluctuations have a greater impact on instrument measurement results, which in turn leads to unstable operation of the ventilation system. In order to monitor the pressure difference between the radioactive control area of each plant and the outdoor atmosphere, a sampling pipe of the pressure measuring instrument needs to be connected to the outdoor atmosphere through a hole in the outer wall of each plant, resulting in a large number of holes in the outer wall of the control area, which affects the sealing integrity of the control area boundary. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a negative pressure centralized monitoring device for a radioactive control area of a nuclear power plant to solve the above-mentioned defects of the prior art.

[0005] The technical solution adopted by the present application to solve the technical problem is: a negative pressure centralized monitoring device for a radioactive control area of a nuclear power plant is constructed, which comprises at least one detection piece, a buffer assembly and a pipeline, the pipeline comprises a main pipe and at least one branch pipe, one end of each detection piece is connected to a control area through the branch pipe, the other end of each detection piece is connected to the main pipe through the branch pipe, the buffer assembly is arranged on the main pipe, the detection piece and the buffer assembly are arranged indoors, and one end of the main pipe is connected to the outside world.

[0006] The detection piece is used to detect the pressure difference between the control area and the outside world.

[0007] The buffer assembly is used to filter the atmospheric fluctuations of the outside world.

[0008] In some embodiments, the buffer assembly comprises a buffer tank for filtering the atmospheric fluctuations of the outside world.

[0009] In some embodiments, the buffer tank is provided with a first chamber, a second chamber and a partition plate.

[0010] The first chamber is connected with the outside through the mother pipe, the second chamber is connected with the detection member through the mother pipe, and the partition plate is arranged between the first chamber and the second chamber.

[0011] In some embodiments, the partition plate is provided with a communication hole to communicate the first chamber and the second chamber.

[0012] In some embodiments, the buffer assembly further comprises an adjusting member, the adjusting member comprising a bypass pipe, one end of the bypass pipe being connected with the first chamber and the other end being connected with the second chamber to communicate the first chamber and the second chamber.

[0013] In some embodiments, the adjusting member further comprises an adjusting valve arranged on the bypass pipe to adjust the communication area of the first chamber and the second chamber.

[0014] In some embodiments, the buffer assembly further comprises at least two treatment members, the treatment members being connected with the first chamber to treat the condensed water in the first chamber.

[0015] The treatment members are connected with the second chamber to treat the condensed water in the second chamber.

[0016] In some embodiments, the treatment members comprise a drainage pipe, a first isolation valve, a second isolation valve and a water storage pipe.

[0017] The first isolation valve and the second isolation valve are arranged on the drainage pipe, and the water storage pipe is arranged between the first isolation valve and the second isolation valve.

[0018] In some embodiments, the water storage pipe is a variable-diameter pipe, and the pipe diameter of the middle part of the water storage pipe is larger than the pipe diameter of the two ends of the water storage pipe.

[0019] In some embodiments, the mother pipe further comprises a pressure taking pipe, and the buffer assembly is connected with the outside through the pressure taking pipe.

[0020] In some embodiments, the detection member is a pressure detection instrument for detecting the pressure difference between the control area and the outside.

[0021] The nuclear power plant radioactive control area negative pressure centralized monitoring device of the present application has the following beneficial effects: the device can filter out the atmospheric fluctuations of the outside world, avoid the influence of external environmental disturbance on the detection member, and improve the accuracy of the detection member in measuring the pressure difference, so that the ventilation and purification system can accurately adjust the air supply and air intake according to the pressure difference, ensure the stable operation of the ventilation and purification system, maintain the stability of the negative pressure in the control area, and at the same time, the device can also reduce the number of openings in the outer wall of the control area, to reduce the influence of the openings in the outer wall on the sealing performance of the control area. BRIEF DESCRIPTION OF DRAWINGS

[0022] The present application will be further described below in conjunction with the accompanying drawings and embodiments, in which:

[0023] Fig. 1 is a schematic diagram of a negative pressure centralized monitoring device for a radioactive control area of a nuclear power plant in an embodiment of the present application;

[0024] Fig. 2 is a schematic diagram of a buffer assembly in an embodiment of the present application. DETAILED DESCRIPTION

[0025] 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 below with reference to the accompanying drawings.

[0026] Figs. 1-2 The nuclear power plant radioactive control area negative pressure centralized monitoring device in some embodiments of the present application is shown, which can be used to monitor the negative pressure of the nuclear power plant radioactive control area, realize dynamic containment control of radioactive substances, and prevent uncontrolled leakage and discharge of radioactive substances, which can include one or more than one detection piece 1, a buffer assembly 2 and a pipeline 3, the pipeline 3 including a main pipe 31 and one or more than one branch pipe 32.

[0027] Specifically, the nuclear power plant includes multiple control areas, and each control area needs a detection piece 1 to monitor the negative pressure relative to the outdoor atmosphere, so the number of detection pieces 1 is equivalent to the number of control areas, and each detection piece 1 is arranged indoors, and one end of each detection piece 1 is connected to a control area through the main pipe 31, so that the detection piece 1 can monitor the pressure in the control area, which means that the control area only needs to be connected to the detection piece 1 through the hole in the indoor inner wall, thereby reducing the hole in the outer wall facing the outside, which further ensures the sealing of the control area and avoids the influence of the external environment on the control area.

[0028] At this time, the other end of each detection piece 1 is connected to the main pipe 31 through the branch pipe 32, and the main pipe 31 extends from the indoor to the outside, so that the detection piece 1 is connected to the outside, so that the detection piece 1 can detect the pressure of the outside, and then the detection piece 1 can obtain the pressure difference between the control area and the outside, and the control area adjusts the air supply and exhaust capacity of the ventilation and purification system according to the signal of the pressure difference, so as to maintain the negative pressure in the control area and prevent the leakage and discharge of radioactive substances. It can be understood that the two ends of each detection piece 1 are connected to the branch pipe 32, which means that the number of branch pipes 32 is twice the number of detection pieces 1.

[0029] At the same time, the buffer assembly 2 is arranged on the mother pipe 31, and the buffer assembly 2 is used for filtering fluctuations of external atmosphere. Because the negative pressure maintaining function of the control area is mainly realized by monitoring the pressure difference between the control area and the external atmosphere, and adjusting the air supply and exhaust of the ventilation and purification system according to the pressure difference signal, the detection of the external atmosphere pressure by the detection element 1 is affected by fluctuations of the external atmosphere. In addition, the negative pressure maintained by the control area is of the same order of magnitude as the pressure change caused by fluctuations of the external atmosphere. If the fluctuations of the external atmosphere are not filtered, the detection of the pressure difference between the control area and the external atmosphere by the detection element 1 will be affected, the pressure difference will change frequently, and the ventilation and purification system will also change frequently, which affects the operation of the ventilation and purification system. In order to ensure the accuracy of the measurement results and the stable operation of the ventilation and purification system, it is necessary to filter the fluctuations of the external atmosphere.

[0030] Therefore, the device can filter fluctuations of the external atmosphere, avoid the influence of external environment on the detection element 1, improve the accuracy of the detection element 1 in measuring the pressure difference, and enable the ventilation and purification system to accurately adjust the air supply and exhaust according to the pressure difference, so as to ensure the stable operation of the ventilation and purification system and maintain the stability of the negative pressure in the control area. In addition, the device can also reduce the number of openings in the outer wall of the control area, so as to reduce the influence of the openings in the outer wall on the sealing performance of the control area.

[0031] The buffer assembly 2 includes a buffer tank 21 in some embodiments. The buffer tank 21 is a horizontal cylindrical structure and is arranged indoors, so as to avoid the influence of the external environment on the operation of the buffer tank 21. The buffer tank 21 is used for filtering fluctuations of the external atmosphere, so as to maintain the stable operation of the ventilation and purification system of the control area.

[0032] Specifically, the buffer tank 21 is provided with a first chamber 211, a second chamber 212 and a partition plate 213 in some embodiments. The first chamber 211 and the second chamber 212 are horizontally arranged on both sides of the buffer tank 21, and the partition plate 213 is arranged between the first chamber 211 and the second chamber 212, so as to separate the first chamber 211 and the second chamber 212. The first chamber 211 is connected with the external atmosphere through the mother pipe 31, that is, the external atmosphere enters the first chamber 211 through the mother pipe 31. The second chamber 212 is connected with the detection element 1 through the mother pipe 31, so that the external atmosphere enters the detection element 1 and the detection element 1 detects the pressure of the external atmosphere.

[0033] Further, in order to make the first chamber 211 and the second chamber 212 communicate, the partition plate 213 is provided with a communication hole 2131 for communicating the first chamber 211 and the second chamber 212, so that the outdoor atmosphere passes through the first chamber 211 and the second chamber 212, and finally enters the detection piece 1 through the mother pipe 31 connected with the second chamber 212 and the detection piece 1, so that the detection piece 1 can detect the outdoor atmospheric pressure. Specifically, the cross-sectional area of the mother pipe 31 is much smaller than that of the first chamber 211 and the second chamber 212, that is, when the outdoor atmosphere enters the first chamber 211 through the mother pipe 31, it means that the outdoor atmosphere first enters the small space from the large space, and the gas volume suddenly decreases in this process, and then the gas reenters the large space from the small space, and the gas volume suddenly increases in this process, so the outdoor atmospheric fluctuation is offset when the volume changes twice, that is, the outdoor atmospheric fluctuation is offset when the outdoor atmosphere enters the first chamber 211, so as to filter out the outdoor atmospheric fluctuation and prevent it from affecting the detection of the detection piece 1.

[0034] When the outdoor atmosphere enters the second chamber 212 from the first chamber 211, it first needs to pass through the communication hole 2131, at which time the gas volume also suddenly decreases in this process, and then the gas enters the second chamber 212 from the communication hole 2131, and the gas volume suddenly increases in this process, so the atmospheric fluctuation is offset when the volume changes twice, that is, the outdoor atmospheric fluctuation is further offset when the outdoor atmosphere enters the second chamber 212 from the first chamber 211, so as to further filter out the outdoor atmospheric fluctuation and make the regulation operation of the ventilation and purification system more stable.

[0035] The buffer assembly 2 further includes an adjusting piece 22 in some embodiments, one end of the adjusting piece 22 is connected with the first chamber 211, and the other end of the adjusting piece 22 is connected with the second chamber 212, the adjusting piece 22 is used to adjust the communication area of the first chamber 211 and the second chamber 212, and the appropriate communication area of the first chamber 211 and the second chamber 212 is adjusted according to the actual demand, so that when the outdoor atmosphere flows from the first chamber 211 to the second chamber 212, the sudden contraction and expansion of the gas flow channel volume can filter out the outdoor atmospheric fluctuation, so as to further ensure the accuracy of the detection result of the detection piece 1 and make the regulation operation of the ventilation and purification system more stable.

[0036] Specifically, the adjusting piece 22 includes a bypass pipe 221 and an adjusting valve 222 in some embodiments, one end of the bypass pipe 221 is connected with the first chamber 211, and the other end of the bypass pipe 221 is connected with the second chamber 212, the bypass pipe 221 is used to communicate the first chamber 211 and the second chamber 212, and the adjusting valve 222 is arranged on the bypass pipe 221 and used to adjust the size of the communication area of the first chamber 211 and the second chamber 212.

[0037] It can be understood that, in order to maintain the communication between the first chamber 211 and the second chamber 212 and further filter the pressure difference caused by the atmospheric fluctuation, a communication hole 2131 is arranged on the partition plate 213 separating the first chamber 211 and the second chamber 212, so as to communicate the first chamber 211 and the second chamber 212 and allow the atmosphere to pass through the communication hole 2131 when flowing from the first chamber 211 to the second chamber 212, thereby filtering the pressure difference caused by the atmospheric fluctuation. However, the aperture of the communication hole 2131 is a fixed value and cannot adjust the size of the aperture. If the aperture of the communication hole 2131 is too large, the pressure difference caused by the atmospheric fluctuation cannot be completely filtered, which affects the detection result of the detection member 1. If the aperture of the communication hole 2131 is too small, the pressure difference caused by the normal environmental change of the external atmosphere is also filtered, and the detection member 1 cannot accurately detect the pressure change of the external atmosphere, thereby affecting the adjustment of the ventilation and purification system and possibly causing damage to the control area.

[0038] Therefore, it is necessary to redesign an adjusting member 22 for communicating the first chamber 211 and the second chamber 212, and the adjusting member 22 can adjust the communication area of the first chamber 211 and the second chamber 212. When the pressure difference caused by the atmospheric fluctuation is small, the adjusting valve 222 can be adjusted to make the bypass pipe 221 partially open or completely open, so as to expand the communication area of the first chamber 211 and the second chamber 212, so that the pressure difference caused by the atmospheric fluctuation when the atmosphere flows from the first chamber 211 to the second chamber 212 is just filtered, and the pressure difference caused by the change of the external environment will not be affected. When the pressure difference caused by the atmospheric fluctuation is large, the adjusting valve 222 can be adjusted to make the bypass pipe 221 partially open or completely closed, so as to reduce the communication area of the first chamber 211 and the second chamber 212, so that the pressure difference caused by the atmospheric fluctuation when the atmosphere flows from the first chamber 211 to the second chamber 212 is completely filtered.

[0039] The buffer assembly 2 further comprises two or more processing members 23 in some embodiments. The processing members 23 are respectively connected to the first chamber 211 and the second chamber 212. The processing member 23 connected to the first chamber 211 is used to process the condensed water in the first chamber 211, and the processing member 23 connected to the second chamber 212 is used to process the condensed water in the second chamber 212.

[0040] Specifically, since the buffer tank 21 is in communication with the outdoor atmosphere, the water vapor of the outdoor atmosphere inevitably enters the buffer tank 21, causing the condensed water in the first chamber 211. If the condensed water in the first chamber 211 is not discharged in time, the condensed water will accumulate in the first chamber 211, reducing the volume of the first chamber 211 and affecting the use of the buffer assembly 2. At the same time, the accumulated condensed water may also block the mother pipe 31, so that the detection member 1 cannot detect the pressure of the atmosphere in time, thereby affecting the detection result of the detection member 1 and failing to ensure the accuracy of the detection result.

[0041] Likewise, when the outdoor atmosphere flows from the first chamber 211 to the second chamber 212, since the gas needs to pass through the communication hole 2131 and the bypass pipe 221 to reach the second chamber 212, due to the communication between the buffer tank 21 and the outdoor atmosphere, the water vapor in the outdoor atmosphere inevitably enters the buffer tank 21, causing condensate to be generated in the first chamber 212. If the condensate in the second chamber 212 is not discharged in time, the condensate will accumulate in the second chamber 212, reducing the volume of the second chamber 212 and affecting the use of the buffer assembly 2. At the same time, the accumulated condensate may also block the mother pipe 31, so that the detection piece 1 cannot detect the pressure of the atmosphere in time, thereby affecting the detection result of the detection piece 1 and failing to ensure the accuracy of the detection result.

[0042] In other embodiments, the processing piece 23 is also connected with the mother pipe 31 for processing the condensate in the mother pipe 31. When the atmosphere flows in the mother pipe 31, the water vapor in the atmosphere may condense to form condensate. If the condensate in the mother pipe 31 is not processed in time, the formed condensate will block the mother pipe 31, affecting the entry of the atmosphere from the mother pipe 31 into the second chamber 212, and further affecting the operation of the entire device. Therefore, it is necessary to timely lead out the condensate formed in the mother pipe 31, that is, by connecting the processing piece 23 with the mother pipe 31, so that the processing piece 23 processes the condensate in the mother pipe 31.

[0043] The processing piece 23 in some embodiments includes a drainage pipe 231, a first isolation valve 232, a second isolation valve 233, and a water storage pipe 234. The drainage pipe 231 is connected with the first chamber 211 or the second chamber 212. In other embodiments, the drainage pipe 231 is also connected with the mother pipe 31. The drainage pipe 231 is used to introduce the condensate formed by the atmosphere into the processing piece 23 for processing, so as to avoid the accumulation of condensate in the first chamber 211, the second chamber 212, or the mother pipe 31, thereby ensuring the normal use of the first chamber 211, the second chamber 212, and the mother pipe 31.

[0044] The first isolation valve 232 is arranged on the drainage pipe 231 and is close to the first chamber 211, the second chamber 212, or the mother pipe 31. The first isolation valve 232 is used to control the flow of condensate from the first chamber 211, the second chamber 212, or the mother pipe 31 to the drainage pipe 231. When the first isolation valve 232 is opened, the condensate can flow from the first chamber 211, the second chamber 212, or the mother pipe 31 to the drainage pipe 231, avoiding the accumulation of condensate in the first chamber 211, the second chamber 212, or the mother pipe 31.

[0045] The second isolation valve 233 is arranged on the drainage pipe 231, and is close to the outlet of the drainage pipe 231, and is used for controlling the flow of the condensed water from the drainage pipe 231. When the second isolation valve 233 is opened, the condensed water can flow out of the drainage pipe 231. At this time, the outlet of the drainage pipe 231 is connected to the waste water collection system through the quick connector, so that the condensed water flowing out of the drainage pipe 231 is discharged to the waste water collection system, so that the condensed water is discharged from the device, and the operation of the first chamber 211, the second chamber 212 or the mother pipe 31 is not affected by the condensed water.

[0046] The water storage pipe 234 is arranged between the first isolation valve 232 and the second isolation valve 233, and is used for storing the condensed water flowing from the first chamber 211, the second chamber 212 or the mother pipe 31 to the drainage pipe 231. Specifically, when the device is running, the first isolation valve 232 is in an open state, and the second isolation valve 233 is in a closed state. The condensed water flows into the water storage pipe 234 from the first chamber 211, the second chamber 212 or the mother pipe 31 by gravity. The water storage pipe 234 stores the condensed water flowing into the treatment device 23, so that the condensed water is not accumulated in the first chamber 211, the second chamber 212 or the mother pipe 31.

[0047] When the device is running normally or stopped for maintenance, in order to discharge the condensed water collected in the water storage pipe 234, the first isolation valve 232 is closed, and the second isolation valve 233 is opened. The connection between the first chamber 211, the second chamber 212 and the mother pipe 31 and the treatment device 23 is isolated, so that the treatment device 23 does not cause pressure fluctuation during the discharge of the condensed water, and the use of the first chamber 211, the second chamber 212 and the mother pipe 31 is not affected. The drainage pipe 231 is connected to the waste water collection system, so that the condensed water in the water storage pipe 234 flows to the waste water collection system by gravity, so that the condensed water is discharged, and the condensed water does not block the mother pipe 31 to affect the measurement accuracy.

[0048] Further, the water storage pipe 234 is a variable-diameter pipe. The middle part of the water storage pipe 234 has a larger diameter. The diameter of one end close to the first isolation valve 232 is smaller than the middle part of the water storage pipe 234. The diameter of one end close to the second isolation valve 233 is smaller than the middle part of the water storage pipe 234. Therefore, the water storage pipe 234 has a larger internal space than an ordinary pipe with the same length, so that the water storage pipe 234 can store more condensed water.

[0049] Specifically, when the pipe diameter near one end of the first isolation valve 232 is smaller than the pipe diameter in the middle of the water storage pipe 234, it is more conducive to the flow of condensed water from the first chamber 211, the second chamber 212 and the mother pipe 31 to the water storage pipe 234, so that the water storage pipe 234 can better collect condensed water, and when the pipe diameter near one end of the second isolation valve 233 is smaller than the pipe diameter in the middle of the water storage pipe 234, the condensed water can be better discharged from the water storage pipe 234 to the wastewater collection system.

[0050] Further, the mother pipe 31 also includes a pressure tapping pipe 311 in some embodiments, at which time the first chamber 211 is connected with the outside through the pressure tapping pipe 311, and the atmosphere outside enters the first chamber 211 through the pressure tapping pipe 311, and the atmosphere in the first chamber 211 enters the second chamber 212 through the communication hole 2131 and the bypass pipe 211, and the detection piece 1 is connected with the second chamber 212 through the mother pipe 31, so that the detection piece 1 can detect the pressure of the atmosphere outside, and the volume of the atmosphere entering the second chamber 212 from the outside changes continuously in the process, so that the atmospheric fluctuation is filtered out in the process.

[0051] Further, the detection piece 1 is a pressure detection instrument for detecting the pressure difference between the control area and the outside, which detects the pressure difference between the control area and the outside by detecting the pressure in the control area and the pressure of the atmosphere outside at the same time, and then sends the signal of the pressure difference to the ventilation and purification system in the control area, and the ventilation and purification system adjusts the air supply and exhaust according to the received signal of the pressure difference, so as to maintain the negative pressure in the control area at a stable value, thereby ensuring the stable operation of the control area and avoiding the leakage of radioactive substances in the control area to the outside.

[0052] When the device is installed, first prepare pressure detection instruments equal to the number of control areas, all of which are arranged indoors, and then use the branch pipe 32 to connect each pressure detection instrument with the corresponding control area, and then use the branch pipe 32 to connect each pressure detection instrument with the mother pipe 31, and connect the mother pipe 31 to the buffer assembly 2, at which time the buffer assembly 2 is also arranged indoors, and the first chamber 211 of the buffer assembly 2 is connected with the outside through the pressure tapping pipe 311, at which time the adjusting piece 22 communicates the first chamber 211 and the second chamber 212, and the processing piece 23 is connected with the first chamber and the second chamber respectively, so as to complete the installation of the device.

[0053] When the device is in operation, the pressure detecting instrument takes pressure from the control area through the branch pipe 32 in the access control area connected with the pressure detecting instrument, the pressure detecting instrument takes pressure from the outside through the pressure taking pipe 311, that is, the outside atmosphere enters the first chamber 211 through the pressure taking pipe 311, then the atmosphere flows to the second chamber 212 through the communication hole 2131 and the adjusting piece 22 from the first chamber 211, in this process, the atmosphere fluctuation is filtered out, so that the pressure detecting instrument can detect the change of the atmospheric pressure more accurately, thus obtaining the accurate pressure difference, and the ventilation and purification system in the control area can also adjust the air supply and exhaust volume of the control area according to the correct pressure difference.

[0054] When the first chamber 211 and the second chamber 212 form the condensed water, at this time, the first isolation valve 232 is opened, the second isolation valve 233 is closed, the condensed water flows from the first chamber 211 and the second chamber 212 to the drainage pipe 231, and finally flows into the water storage pipe 234 and is stored by the water storage pipe 234, when the condensed water needs to be discharged from the device, the drainage pipe 231 is connected with the waste water collection system, at the same time, the first isolation valve 232 is closed, the second isolation valve 233 is opened, the condensed water flows from the water storage pipe 234 to the waste water collection system, thus completing the treatment of the condensed water.

[0055] It can be understood that the above technical features can be used in any combination without limitation.

[0056] The above is only the embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structure or equivalent flow transformation made by using the content of the specification and the drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A negative pressure centralized monitoring device for a radioactive control area of a nuclear power plant, characterized in that, The application relates to a pressure detection device, which comprises at least one detection piece (1), a buffer assembly (2) and a pipeline (3), wherein the pipeline (3) comprises a main pipeline (31) and at least one branch pipeline (32), one end of each detection piece (1) is connected with a control area through the branch pipeline (32), the other end of each detection piece (1) is connected with the main pipeline (31) through the branch pipeline (32), the buffer assembly (2) is arranged on the main pipeline (31), the detection piece (1) and the buffer assembly (2) are arranged indoors, and one end of the main pipeline (31) is connected with the outside world. The detection piece (1) is used for detecting the pressure difference between the control area and the outside world. The buffer assembly (2) is used for filtering the atmospheric fluctuation of the outside world. The buffer assembly (2) comprises a buffer tank (21) for filtering the atmospheric fluctuation of the outside world, the buffer tank (21) is provided with a first chamber (211), a second chamber (212) and a partition plate (213), the first chamber (211) is connected with the outside world through the main pipeline (31), the second chamber (212) is connected with the detection piece (1) through the main pipeline (31), and the partition plate (213) is arranged between the first chamber (211) and the second chamber (212). The buffer assembly (2) further comprises an adjusting piece (22), the adjusting piece (22) comprises a bypass pipeline (221), one end of the bypass pipeline (221) is connected with the first chamber (211), the other end of the bypass pipeline (221) is connected with the second chamber (212), so as to communicate the first chamber (211) and the second chamber (212), and the adjusting piece (22) further comprises an adjusting valve (222) arranged on the bypass pipeline (221), so as to adjust the communication area of the first chamber (211) and the second chamber (212).

2. The nuclear power plant radioactive control area negative pressure centralized monitoring device according to claim 1, characterized in that, The partition plate (213) is provided with a communication hole (2131) for communicating the first chamber (211) and the second chamber (212).

3. The nuclear power plant radioactive control area negative pressure centralized monitoring device according to claim 1, characterized in that, The buffer assembly (2) further comprises at least two treatment pieces (23), the treatment pieces (23) are connected with the first chamber (211) and used for treating condensed water in the first chamber (211), The treatment pieces (23) are connected with the second chamber (212) and used for treating condensed water in the second chamber (212).

4. The nuclear power plant radioactive control area negative pressure centralized monitoring device according to claim 3, characterized in that, The treatment piece (23) comprises a drainage pipeline (231), a first isolation valve (232), a second isolation valve (233) and a water storage pipeline (234). The first isolation valve (232) and the second isolation valve (233) are arranged on the drainage pipeline (231), and the water storage pipeline (234) is arranged between the first isolation valve (232) and the second isolation valve (233).

5. The nuclear power plant radioactive control area negative pressure centralized monitoring device according to claim 4, characterized in that, The water storage pipeline (234) is a variable-diameter pipeline, the pipe diameter of the middle part of the water storage pipeline (234) is larger than the pipe diameter of the two ends of the water storage pipeline (234).

6. The device for centralized monitoring of negative pressure in a controlled area of a nuclear power plant according to any of claims 1 to 5, characterized in that, The main pipeline (31) further comprises a pressure-taking pipeline (311), and the buffer assembly (2) is connected with the outside world through the pressure-taking pipeline (311).

7. The device for centralized monitoring of negative pressure in a controlled area of a nuclear power plant according to any of claims 1 to 5, characterized in that, The detection piece (1) is a pressure detection instrument for detecting the pressure difference between the control area and the outside.

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