A temperature and humidity monitoring system and method for dry storage of nuclear power spent fuel

Abstract

The present invention relates to a nuclear power spent fuel dry storage temperature and humidity monitoring system and monitoring method. The monitoring system includes a temperature and humidity monitoring unit and a temperature and humidity data acquisition and processing unit. The temperature and humidity monitoring unit is arranged in the spent fuel storage module, and includes a temperature and humidity sensor and a bracket for installing the temperature and humidity sensor. The temperature and humidity data acquisition and processing unit is arranged outside the spent fuel storage module, and is used to collect temperature and humidity sensor data information, and compare the collected data information with pre-stored safety data information, analyze and determine whether the current data is abnormal data, and if the current data is abnormal data, start the alarm device, and send the current abnormal data information to the monitoring terminal in the form of an alarm. The temperature and humidity monitoring system can accurately monitor the temperature of the spent fuel storage tank and the temperature and humidity of the storage space of the spent fuel storage tank in real time and for a long time, and when the data is abnormal, send an alarm message to the monitoring terminal so that the staff can make timely processing to ensure the normal operation of the spent fuel dry storage system.

Description

Technical Field

[0001] The invention belongs to the technical field of temperature and humidity monitoring in civil engineering, and in particular relates to a temperature and humidity monitoring system and a monitoring method for dry storage of spent nuclear power fuel. Background Art

[0002] The fuel in the nuclear power plant is put into the spent fuel pool after unloading, and transferred to the spent fuel dry storage system after degradation. The spent fuel dry storage system has been slowly introduced into China and put into use in recent years. Its purpose is to solve the problem of insufficient capacity of the spent fuel pool. The spent fuel dry storage system includes a spent fuel storage module 5, a spent fuel storage tank (not shown in the figure), an air inlet 6, an air outlet 7, a bottom plate 8 and a sealing door 9. The spent fuel storage tank is placed in the spent fuel storage module 5 and sealed by the sealing door 9, as shown in Figure 8. After the spent fuel is placed in the spent fuel storage tank, it will continue to degrade and release a large amount of heat, so it needs to be monitored for temperature and humidity. At present, the temperature and humidity monitoring of the spent fuel storage system is to fix the temperature and humidity sensor on the surface of the spent fuel storage tank through a simple mounting bracket. The monitoring period is usually 2 to 5 years, and the monitoring environment is high temperature and irradiation, so the durability and accuracy of the temperature and humidity sensor are very high. The current problems with temperature and humidity sensors are: (1) The temperature sensor is not in close contact with the spent fuel storage tank, resulting in inaccurate temperature monitoring; (2) The temperature and humidity sensor is difficult to replace after failure because the spent fuel storage space is small and it is not suitable for personnel to enter under high-temperature radiation environment; (3) When abnormal conditions occur in the spent fuel storage tank and the storage space of the spent fuel storage tank, the abnormal information cannot be obtained in time, posing a safety hazard. Summary of the invention

[0003] In view of the defects existing in the prior art, the present invention provides a nuclear power spent fuel dry storage temperature and humidity monitoring system, which solves the problems of inaccurate temperature monitoring, difficulty in replacing temperature and humidity sensors after failure, and failure to obtain abnormal information in time when abnormal temperature and humidity occur in spent fuel storage tanks and the storage space of spent fuel storage tanks.

[0004] The technical solution solved by the present invention is: to provide a nuclear power spent fuel dry storage temperature and humidity monitoring system, comprising a temperature and humidity monitoring unit and a temperature and humidity data acquisition and processing unit, wherein the temperature and humidity monitoring unit is arranged in a spent fuel storage module, and comprises a temperature and humidity sensor and a bracket for installing the temperature and humidity sensor; the temperature and humidity data acquisition and processing unit is arranged outside the spent fuel storage module, and is used to collect temperature and humidity sensor data information, and compare the collected data information with pre-stored safety data information, analyze and judge whether the current data is abnormal data, if the current data is abnormal data, start an alarm device, and send the current abnormal data information to a monitoring terminal in the form of an alarm, and if the current data is normal data, directly send normal data information to the monitoring terminal.

[0005] Furthermore, in the spent fuel dry storage temperature and humidity monitoring system as described above, the temperature and humidity sensor bracket is used to install the temperature and humidity sensor, and its cover is arranged on the periphery of the spent fuel storage tank, which includes a frame, and the lower part of the frame is axially arranged with two rows of legs, and a row of supports are arranged at corresponding positions below each row of the legs, and a slide rail is fixed on each row of the supports, and the lower ends of each row of the legs extend into the slide rail on the corresponding side and can slide freely along the slide rail.

[0006] Furthermore, in the spent fuel dry storage temperature and humidity monitoring system as described above, a plurality of threaded holes are arranged axially on the frame.

[0007] Furthermore, in the spent fuel dry storage temperature and humidity monitoring system as described above, the frame cross section is an arc-shaped structure, including a plurality of arc-shaped rings forming longitudinal ribs and a plurality of transverse ribs arranged along the circumference and perpendicularly crossing the longitudinal ribs.

[0008] Furthermore, in the spent fuel dry storage temperature and humidity monitoring system as described above, the longitudinal section of the support leg is a triangular structure, the top surface of which is an arc structure, and the bottom surface is a semicircular structure.

[0009] Further, in the spent fuel dry storage temperature and humidity monitoring system as described above, the legs are fixedly connected to the arc-shaped openings of the frame.

[0010] Furthermore, in the spent fuel dry storage temperature and humidity monitoring system as described above, the support is a square structure, and a groove for placing the slide rail is formed on the top surface of the support.

[0011] Furthermore, in the spent fuel dry storage temperature and humidity monitoring system as described above, the slide rail is fixed to the support by anchor nails.

[0012] Further, in the spent fuel dry storage temperature and humidity monitoring system as described above, the temperature and humidity data acquisition and processing unit includes a data acquisition module and a data processing module, the data acquisition module is used to collect temperature and humidity sensor data information in real time and send the collected information to the data processing module; the data processing module is used to receive data acquisition module information, and compare the collected information with pre-stored safety data information, analyze and determine whether the current data is abnormal data, if the current data is abnormal data, start the alarm device and send the alarm information, if the current data is normal data, directly send the normal data.

[0013] Furthermore, in the spent fuel dry storage temperature and humidity monitoring system as described above, the data acquisition module is connected to the temperature and humidity sensor via a wired or wireless connection, and the data processing module is connected to the monitoring terminal via a wired or wireless connection.

[0014] The present invention also provides a method for monitoring temperature and humidity of dry storage of nuclear power spent fuel, comprising the following steps:

[0015] S1: Establish a temperature and humidity sensor bracket in the spent fuel storage module and install the temperature and humidity sensor;

[0016] S2 uses the data acquisition unit to collect and save the data of each temperature and humidity sensor;

[0017] S3 uses the data processing module to compare the collected data with the pre-stored security data, and analyzes and determines whether the collected information is abnormal;

[0018] S4 If the collected data is abnormal data, the alarm device is activated to send an alarm message to the monitoring terminal. If the collected data is normal data, normal message is sent to the monitoring terminal.

[0019] The beneficial technical effects of the present invention are:

[0020] (1) The present invention provides a sensor mounting bracket, and provides a plurality of threaded holes on the bracket. The temperature and humidity sensor is fixed to the bracket through the threaded holes, thereby ensuring that the temperature sensor is in closer contact with the surface of the spent fuel storage tank, making the temperature measurement result more accurate. In addition, by long-term monitoring of the surface of the spent fuel storage tank, the deliquescence of the spent fuel storage tank itself can be determined, thereby ensuring the normal operation of the spent fuel storage system.

[0021] (2) The present invention provides legs and slide rails so that the bracket can be pushed out and pushed in, thereby solving the problem of being unable to enter the spent fuel storage space to install and replace the temperature and humidity sensor under high-temperature irradiation and narrow space.

[0022] (3) The present invention can obtain temperature and humidity sensor data information in real time by setting up a temperature and humidity data acquisition and processing unit. When an abnormal value is found in the data information, an alarm text message can be sent to the monitoring terminal. After receiving the alarm text message, the staff can take timely action to prevent accidents from happening and ensure the normal operation of the spent fuel storage system.

[0023] (4) The monitoring system of the present invention can monitor the spent fuel storage tank and the storage space of the spent fuel storage tank for a long time without being disturbed by natural factors such as wind, snow, rain or vibration factors; it is small in size and light in weight, and will not burden the spent fuel dry storage system itself or affect its operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural block diagram of the monitoring system of the present invention;

[0025] Figure 2 It is a structural schematic diagram of the temperature and humidity sensor bracket of the present invention;

[0026] Figure 3 yes Figure 2 The main view;

[0027] Figure 4 yes Figure 2 Side view of

[0028] Figure 5 yes Figure 2 The structural diagram of the middle frame;

[0029] Figure 6 yes Figure 2 Schematic diagram of the structure of the middle outrigger;

[0030] Figure 7 yes Figure 2 Schematic diagram of the structure of the middle support;

[0031] Figure 8a , 8b They are respectively a side view and a top view of the temperature sensor distribution of the present invention;

[0032] Figure 9a , 9b They are respectively a side view and a top view of the temperature and humidity sensor distribution of the present invention;

[0033] Fig.10 It is an installation diagram of the temperature and humidity sensor bracket of the present invention;

[0034] Fig.11 This is a working state diagram of the temperature and humidity sensor bracket of the present invention;

[0035] Fig.12 It is a flow chart of the monitoring method of the present invention.

[0036] In the figure:

[0037] 1-frame 2-leg 3-support 4-slide 5-spent fuel storage module 6-air inlet 7-air outlet 8-bottom plate 9-sealed door 10-temperature sensor 11-humidity

[0038] Degree Sensor DETAILED DESCRIPTION

[0039] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0040] It should be noted that the terms "first", "second", etc. in the specification, claims and drawings of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence, and it should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0041] like Figure 1 As shown, a nuclear power spent fuel dry storage temperature and humidity monitoring system provided by the present invention is applied to the spent fuel dry storage system, which includes a temperature and humidity monitoring unit and a temperature and humidity data acquisition and processing unit. The temperature and humidity monitoring unit is arranged in the spent fuel storage module 5, and is used to monitor the temperature of the spent fuel storage tank in the spent fuel storage module 5 and the temperature and humidity of the storage space in the spent fuel storage module, and includes a temperature and humidity sensor and a bracket for installing the temperature and humidity sensor. The temperature and humidity data acquisition and processing unit is arranged outside the spent fuel storage module 5, and is connected to the temperature and humidity monitoring unit by wire or wireless, and is used to collect temperature and humidity sensor data information, and compare the collected data information with the pre-stored safety data information, analyze and determine whether the current data is abnormal data, if the current data is abnormal data, the alarm device is activated, and the alarm information is sent to the monitoring terminal, and the monitoring personnel make timely processing after receiving the alarm information to avoid accidents, and if the current data is normal data, the normal information is directly sent to the monitoring terminal without the need for an alarm prompt. Therefore, the monitoring system of the present invention can obtain data information of the temperature and humidity sensors in real time. When abnormal values ​​are found in the data information, an alarm text message can be sent to the monitoring terminal so that the staff can deal with it in time, thereby preventing accidents from happening and ensuring the normal operation of the spent fuel storage system.

[0042] like Figure 2-4 As shown, the temperature and humidity sensor bracket includes a frame 1, and two rows of legs 2 are arranged axially at the lower part of the frame 1. A row of supports 3 are arranged at the corresponding position below each row of legs 2. A slide rail 4 is fixed on each row of supports 3. The lower end of each leg 2 extends into the slide rail 4 on the corresponding side and can slide freely along the slide rail 4. In order to ensure the stability of the frame, the number of legs 2 and supports 3 is the same and the positions are corresponding. Therefore, the bracket of the present invention can be pushed out and pushed in after being loaded into the spent fuel storage tank, which solves the problem that the temperature sensor cannot be installed and replaced in a high-temperature irradiation environment.

[0043] like Figure 5 As shown, the cross section of the frame 1 is an arc-shaped structure, including longitudinal ribs formed by a plurality of arc-shaped rings and a plurality of transverse ribs arranged along the circumference and perpendicularly crossing the longitudinal ribs. The frame 1 is made of steel.

[0044] like Figure 6As shown, the longitudinal section of the leg 2 is a triangular structure, the upper surface of which is an arc structure, which is convenient for matching with the longitudinal ribs of the frame, and the lower surface is a semicircular structure, which is convenient for sliding on the slide rail and reducing friction. The leg 2 is fixed to both sides of the frame opening by welding.

[0045] like Figure 7 As shown, the support 3 is a square body structure, and a groove is provided on the upper surface of the support 3 for placing the slide rail 4, and the slide rail 4 is fixed on the support 3 by anchor nails.

[0046] In addition, multiple threaded holes are arranged along the axial direction on the frame 1 for fixing the temperature and humidity sensor, and the temperature and humidity sensor is connected to the frame 1 by threads. In this way, the temperature sensor is in tighter contact with the surface of the spent fuel storage tank and will not loosen, thus ensuring the accuracy of temperature measurement. It should be noted that when connecting the temperature sensor, it is necessary to ensure that the temperature sensor probe fits the surface of the spent fuel storage tank.

[0047] In order to simplify the structure, the present invention optimizes the arrangement of the temperature sensor and the humidity sensor. The specific arrangement is as follows:

[0048] The heat of the spent fuel storage tank is generated by the decay of the spent fuel inside, so the surface temperature is close to uniform distribution. However, considering that cold air enters from the bottom and hot air is discharged from the top after passing through the spent fuel storage tank, through the temperature field analysis of the spent fuel storage tank, 5 temperature sensors 10 should be evenly distributed along the axial direction on the top of the frame, and 3 temperature sensors 10 should be evenly distributed along the axial direction on both sides of the frame, such as Figure 8a , 8b As shown. The temperature sensor may be a resistance temperature sensor specially made by MCC Building Research Institute Co., Ltd., which has excellent high temperature resistance and radiation resistance, large range and high precision. Other temperature sensors may also be used.

[0049] The air temperature around the spent fuel storage tank is lowest at the inlet and gradually increases from bottom to top. Therefore, three rows of temperature sensors are arranged in the spent fuel storage module according to height, with two in each row. Humidity sensors 11 are arranged in two rows according to height, with two in each row. Figure 9a , 9b As shown. The temperature and humidity sensor can be a two-in-one high-temperature temperature and humidity sensor specially made by MCC Building Research Institute Co., Ltd., which has the characteristics of accurate measurement, wide temperature range, strong resistance to chemical pollution, stable operation, long service life, etc. Other temperature and humidity sensors can also be used.

[0050] The present invention adopts a temperature and humidity sensor specially made by MCC General Research Institute of Building and Construction Co., Ltd. and optimizes the arrangement method of the temperature and humidity sensor, thereby greatly simplifying the bracket structure and data processing method, improving the data processing speed and accuracy, and facilitating installation on the spent fuel storage system. When the service life is reached, it can be replaced at any time without affecting the use of other equipment, thereby ensuring the continuity of the measuring point data.

[0051] like Fig.10 As shown, the temperature and humidity sensor bracket is placed inside the storage space of the spent fuel storage tank, wrapping the spent fuel storage tank (the spent fuel storage tank is a cylindrical structure, not shown in the figure). The specific installation process is as follows:

[0052] Install multiple supports in two rows at suitable positions on the bottom plate of the spent fuel storage module; install two slide rails on each row of supports respectively, and fix the slide rails with anchor nails; make a frame in advance according to the size of the spent fuel storage tank, and weld two rows of legs axially at the openings on both sides of the bottom of the frame; extend the lower part of each leg into the corresponding slide rail; set threaded holes at the temperature measurement point of the frame, and after pushing the bracket out of the storage space, fix the temperature sensor with threads on the frame through the threaded holes, and then push the bracket into the storage space; when the temperature sensor needs to be replaced, push the mounting bracket out and replace it, such as Fig.11 shown.

[0053] The temperature and humidity data acquisition and processing unit includes a data acquisition module, a data processing module and a monitoring terminal.

[0054] The data acquisition module is an acquisition chip, which is connected to the temperature and humidity sensor by wire or wireless, and synchronously collects and saves the temperature and humidity sensor data in each spent fuel storage module. The present invention is illustrated by three spent fuel storage modules, namely 1# spent fuel storage module, 2# spent fuel storage module and 3# spent fuel storage module, and each spent fuel storage module is set with an IP address to determine the location of the temperature and humidity sensor.

[0055] The data processing module is the main control computer, which is used to receive information from the data acquisition module, and compare the received data information with the pre-stored safety data information, analyze and determine whether the current data is abnormal data. If the current data is abnormal data, the alarm device is activated to send an alarm message. If the current data is normal data, normal data is directly sent. The temperature limit of the present invention is 400°C. If the temperature limit is exceeded, it is abnormal data. The humidity limit is 90%RH. If the humidity limit is exceeded, it is abnormal data. It should be noted that the temperature limit and humidity limit of the present invention are only exemplary descriptions and do not limit the present invention. In actual applications, the temperature limit and humidity limit will change differently according to different working conditions.

[0056] The monitoring terminal is a PC or a mobile phone, which is connected to the data processing module via wired or wireless communication and is used to receive normal data information and abnormal data information sent by the data processing module in real time.

[0057] The method for monitoring temperature and humidity of spent fuel dry storage of the present invention comprises the following steps: Fig.12 As shown,

[0058] S1: Establish a temperature and humidity sensor bracket, set threaded holes on the bracket, and install the temperature and humidity sensor;

[0059] S2 synchronously collects and saves the temperature and humidity sensor data of each spent fuel storage module in real time;

[0060] S3 compares the collected data with the pre-stored security data, analyzes and determines whether the collected information is abnormal data;

[0061] S4 If the collected data is abnormal data, the alarm device is activated to send an alarm message to the monitoring terminal. If the collected data is normal data, normal information is directly sent to the monitoring terminal.

[0062] The above is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art can make equivalent substitutions or changes based on the technical solutions and inventive concepts disclosed by the present invention, and the obtained technical solutions should be included in the protection scope of the present invention.

Claims

1. A temperature and humidity monitoring system for dry storage of nuclear power spent fuel, comprising a temperature and humidity monitoring unit and a temperature and humidity data acquisition and processing unit, characterized in that: The temperature and humidity monitoring unit is arranged in the spent fuel storage module (5), and comprises a temperature and humidity sensor and a bracket for installing the temperature and humidity sensor; The temperature and humidity data acquisition and processing unit is arranged outside the spent fuel storage module (5) and is used to acquire data information from the temperature and humidity sensors, and compare the acquired data information with the pre-stored safety data information, analyze and determine whether the current data is abnormal data, and if the current data is abnormal data, activate the alarm device and send the current abnormal data information to the monitoring terminal in the form of an alarm, and if the current data is normal data, directly send the normal data information to the monitoring terminal; the bracket is arranged on the periphery of the spent fuel storage tank, and comprises a frame (1), two rows of legs (2) are arranged axially at the lower part of the frame (1), a row of supports (3) are arranged at corresponding positions below each row of the legs (2), a slide rail (4) is fixed on each row of the supports (3), and the lower ends of each row of the legs (2) extend into the slide rail (4) on the corresponding side and can slide freely along the slide rail (4); the legs (2) and the supports (3) are the same in number and have corresponding positions.

2. A nuclear power spent fuel dry storage temperature and humidity monitoring system as claimed in claim 1, characterized in that: A plurality of threaded holes are arranged axially on the frame (1).

3. The temperature and humidity monitoring system for dry storage of nuclear power spent fuel according to claim 2, characterized in that: The frame (1) has an arc-shaped cross section, comprising a plurality of arc-shaped rings forming longitudinal ribs and a plurality of transverse ribs arranged along the circumference and perpendicularly crossing the longitudinal ribs.

4. A nuclear power spent fuel dry storage temperature and humidity monitoring system as claimed in claim 3, characterized in that: The longitudinal section of the supporting leg (2) is a triangular structure, the top surface is an arc-shaped structure, and the bottom surface is a semicircular structure.

5. A temperature and humidity monitoring system for dry storage of nuclear power spent fuel as claimed in claim 4, characterized in that: The supporting leg (2) is fixedly connected to the arc-shaped opening of the frame (1).

6. A temperature and humidity monitoring system for dry storage of nuclear power spent fuel as claimed in claim 5, characterized in that: The support (3) is a square structure, and a groove for accommodating the slide rail (4) is provided on the top surface thereof.

7. A temperature and humidity monitoring system for dry storage of nuclear power spent fuel according to any one of claims 1 to 6, characterized in that: The temperature and humidity data acquisition and processing unit includes a data acquisition module and a data processing module. The data acquisition module is used to collect temperature and humidity sensor data information in real time and send the collected data information to the data processing module; the data processing module is used to receive data acquisition module information, and compare the received data information with pre-stored safety data information, analyze and determine whether the current data is abnormal data. If the current data is abnormal data, the alarm device is activated and the alarm information is sent. If the current data is normal data, the normal data information is directly sent.

8. A temperature and humidity monitoring system for dry storage of nuclear power spent fuel as claimed in claim 7, characterized in that: The data acquisition module is connected to the temperature and humidity sensor via wired or wireless communication, and the data processing module is connected to the monitoring terminal via wired or wireless communication.

9. A method for monitoring spent fuel dry storage using the temperature and humidity monitoring system for spent fuel dry storage of nuclear power plants described in any one of 1 to 8, comprising the following steps: S1 builds a temperature and humidity sensor bracket and installs the temperature and humidity sensor; The support is arranged on the periphery of the spent fuel storage tank, and comprises a frame (1). Two rows of legs (2) are arranged axially at the lower part of the frame (1). A row of supports (3) are arranged at corresponding positions below each row of legs (2). A slide rail (4) is fixed on each row of supports (3). The lower ends of the legs (2) in each row extend into the slide rail (4) on the corresponding side and can slide freely along the slide rail (4). The legs (2) and supports (3) are of the same number and have corresponding positions. S2 collects and saves the data of each temperature and humidity sensor; S3 compares the collected data with the pre-stored security data to analyze and determine whether the collected information is abnormal; S4 If the collected data is abnormal data, the alarm device is activated to send an alarm message to the monitoring terminal. If the collected data is normal data, normal information is directly sent to the monitoring terminal.

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