Detection system and method for containment of small nuclear power plant

Abstract

The invention provides a detection system and method for a containment vessel of a small nuclear power plant, and the system comprises a plurality of sensor groups which at least comprise pressure sensors and are disposed at different positions of the containment vessel; one moisture resistance meter group is arranged at each position where the sensor group is arranged, and is used for acquiring the moisture resistance depth; the leakage rate calculation module is used for calculating and obtaining the leakage rate according to the moisture resistance depth at the corresponding position, the air pressure difference and the inner wall surface area of the containment; and the permeability calculation module is used for calculating the permeability according to the leakage rate, the moisture resistance depth, the inner wall surface area of the containment and the air pressure difference of the air passing through the concrete. According to the invention, comprehensive detection of the containment vessel under the conditions of high temperature, high humidity and non-constant pressure can be realized, the actual condition of the leakage rate can be further verified through in-situ permeability detection, and the actual leakage rate of the containment vessel in a high-temperature and high-humidity environment can be finely detected.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant containment detection, and in particular relates to a detection system and method for a containment of a small nuclear power plant. Background Art

[0002] With the development of nuclear power technology, some small reactors have adopted an integrated core modular design. Their process systems and internal structures are simpler and more compact than those of traditional large reactors in nuclear power plants. This ensures that the core can always be flooded with water under all assumed operating conditions without core melting. Therefore, the radioactive source terms generated by this type of integrated core under hypothetical accidents are far lower than those of large reactors, and their containment vessels can also adopt prestressed structures without steel linings.

[0003] The containment structure of a nuclear power plant is an important maintenance structure of a nuclear power plant, which has the function of blocking radioactive materials in the reactor. Therefore, the structural safety of the containment is particularly important. Therefore, in order to ensure the integrity and sealing of the containment, it is necessary to conduct sealing tests on the containment regularly. During the normal operation of the unit, it is necessary to monitor the changes in the containment sealing, the deformation, displacement, stress strain and aging creep of the concrete structure in real time to ensure the reliability and safety of the containment. However, the existing technology lacks a system for comprehensive testing of various properties of the containment, making it difficult to achieve comprehensive testing of the containment. Summary of the invention

[0004] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a detection system and method for the containment of a small nuclear power plant, so as to solve the problem that the prior art lacks a system for comprehensive detection of various performances of the containment and is difficult to achieve comprehensive detection of the containment.

[0005] To achieve the above-mentioned and other related purposes, the present invention provides a detection system for a containment of a small nuclear power plant, comprising:

[0006] A plurality of sensor groups, each of which includes at least a pressure sensor, arranged at different positions of the containment vessel, for obtaining the air pressure difference of the air at the corresponding position passing through the concrete;

[0007] A humidity meter group, each position where the sensor group is arranged is respectively arranged with a group of humidity meter groups, each group of humidity meter groups includes four humidity meters, and the four humidity meters are arranged at different depths of the containment shell wall for obtaining humidity resistance depth;

[0008] A leakage calculation module is used to calculate the leakage amount according to the moisture resistance depth at the corresponding position, the air pressure difference and the inner wall surface area of ​​the containment vessel and according to a preset leakage calculation model;

[0009] The permeability calculation module is used to calculate the permeability according to the leakage amount, the moisture resistance depth, the inner wall surface area of ​​the containment, and the air pressure difference of the air passing through the concrete.

[0010] In one embodiment of the present invention, the ring beam, the opening, the truncated cone and the standard section of the shell wall of the containment are respectively provided with the humidity resistance meter group.

[0011] In one embodiment of the present invention, three groups of humidity resistance meters are evenly arranged in the standard sections of the shell wall above and below the opening along the circumferential direction of the containment shell, and two groups of humidity resistance meters are arranged at the ring beam, the opening and the truncated cone, respectively.

[0012] In one embodiment of the present invention, the preset leakage calculation model is:

[0013] Q = k 修正 ·A·Δp / L, where k 修正 is the pre-calibrated corrected permeability coefficient; A is the inner wall surface area of ​​the containment; Δp is the air pressure difference; L is the wet resistance depth; Q is the leakage amount.

[0014] In one embodiment of the present invention, a stress and strain detection subsystem is further included. The stress and strain detection subsystem includes multiple groups of strain gauges and temperature sensors arranged on the containment shell wall to detect the stress and strain of the concrete containment shell structure.

[0015] In one embodiment of the present invention, a plurality of measuring points are provided on the containment, each of which is provided with three strain gauges and a temperature sensor, and the measuring points include the raft foundation, cylinder, dome connection area, equipment gate, cylinder truncated cone, dome ring beam and buttresses of the containment.

[0016] In one embodiment of the present invention, the three strain gauges at each measuring point are arranged at different depths along the thickness direction of the containment vessel wall.

[0017] In one embodiment of the present invention, a deformation detection subsystem is further included. The deformation detection subsystem includes a plumb line system and an indium tile line system arranged circumferentially and vertically in the containment shell, which is used to detect the circumferential displacement and vertical displacement of the containment shell.

[0018] In one embodiment of the present invention, the deformation detection subsystem further includes inclinometers arranged at the top and bottom of the containment shell, which are used to detect the inclination of the containment shell.

[0019] In one embodiment of the present invention, it also includes an optical fiber intelligent steel strand subsystem, which is arranged in the shell wall and dome of the containment shell to detect the prestressed tension of the prestressed steel bars of the containment shell. The optical fiber intelligent steel strand subsystem includes a plurality of optical fiber intelligent steel strands, which are arranged circumferentially and vertically in the shell wall of the containment shell and the dome of the containment shell.

[0020] In one embodiment of the present invention, a creep detection subsystem is further included. The creep detection subsystem includes a zero stress gauge arranged on the shell wall of the containment shell to detect the long-term creep of the containment shell concrete.

[0021] In one embodiment of the present invention, the creep detection subsystem includes multiple measuring points, each of which is equipped with at least one zero stress gauge, and the dome, wall, opening, truncated cone and bottom plate of the containment are respectively provided with at least one measuring point.

[0022] The present invention also proposes a detection method for a containment of a small nuclear power plant, comprising:

[0023] Obtain the temperature, humidity, moisture resistance depth, inner wall surface area of ​​the containment and the air pressure difference of air passing through concrete at the location to be tested;

[0024] The leakage amount is calculated based on the temperature, humidity and moisture resistance depth at the corresponding position and according to a preset leakage amount calculation model;

[0025] The permeability is obtained by calculation according to the leakage amount, the moisture resistance depth, the inner wall surface area of ​​the containment vessel and the air pressure difference and in accordance with a preset permeability calculation model.

[0026] In one embodiment of the present invention, the preset leakage calculation model is:

[0027] Q = k 修正 ·A·Δp / L, where k is the calibrated permeability coefficient obtained in advance; A is the inner wall surface area of ​​the containment; Δp is the air pressure difference; L is the wet resistance depth; Q is the leakage; wi is the weight coefficient of the product of the i-th manufacturer; C t is the temperature correction coefficient; C h is the humidity correction factor.

[0028] In one embodiment of the present invention, the modified permeability coefficient k is obtained. 修正 The steps include:

[0029] Establish a test environment that is identical to the service environment of the containment under test during operation;

[0030] Tests were conducted under this test environment to obtain the leakage volume, the path length of air through the concrete, the cross-sectional area of ​​the test area, and the air pressure difference;

[0031] Obtain the calibrated permeability coefficient according to the leakage volume, the length of the path through which air passes through the concrete, the cross-sectional area of ​​the test area, and the air pressure difference;

[0032] Establishing a fitting formula according to the calibrated permeability coefficient, temperature and humidity;

[0033] Test the different measuring points of the containment to be tested multiple times to obtain the temperature and humidity, and calculate the average temperature and humidity values;

[0034] Obtaining a corresponding temperature correction coefficient and a humidity correction coefficient according to the temperature average value and the humidity average value;

[0035] Initialize the weight coefficient wi of each of the multiple tests, and substitute the calibrated permeability coefficient, the temperature correction coefficient, the humidity correction coefficient and the weight coefficient of each time into the fitting formula to calculate the weighted average of each of the multiple tests;

[0036] Take the median of the weighted average of each of the multiple tests as the corrected permeability coefficient k 修正 .

[0037] The present invention proposes a detection system and method for the containment of a small nuclear power plant, which not only realizes the high temperature and high humidity environment and non-constant pressure conditions, but also takes into account the long-term detection of concrete aging creep and the in-situ penetration detection of specific parts. It can realize the detection of stress-strain, creep, structural displacement deformation inclination and cracks of concrete and prestressed steel bars, prestressed tension of prestressed steel bars, temperature and humidity of the internal environment of the containment, actual pressure value inside the containment, in-situ permeability of specific positions of the containment and other data under the conditions of high temperature and high humidity and non-constant pressure, so as to realize comprehensive detection of the containment, and at the same time calculate the leakage rate of the containment according to the data obtained from different detections, so as to ensure the reliability and safety of the containment. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0039] Figure 1 The diagram is a distribution diagram of a containment vessel and a humidity resistance meter group in one embodiment of the present invention.

[0040] Figure 2 The diagram is a schematic diagram of the circumferential arrangement of a moisture resistance meter group in a standard section of a wall in one embodiment of the present invention.

[0041] Figure 3 The figure is a schematic diagram of the circumferential arrangement of the humidity resistance meter group at the ring beam, the hole and the truncated pyramid in one embodiment of the present invention.

[0042] Figure 4 The figure is a schematic diagram of the arrangement of four humidity resistance meters in a humidity resistance meter group in a wall according to one embodiment of the present invention.

[0043] Figure 5 FIG. 1 is a schematic diagram of the front view arrangement of a plumb line system in one embodiment of the present invention.

[0044] Figure 6 FIG. 1 is a schematic top view of the indium tile line system according to an embodiment of the present invention.

[0045] Figure 7 FIG. 1 is a schematic diagram of an optical fiber intelligent steel strand arranged vertically in one embodiment of the present invention.

[0046] Figure 8 It is a schematic diagram of an optical fiber intelligent steel strand arranged along a circumferential direction in one embodiment of the present invention.

[0047] Fig. 9 Schematic diagram of the optical fiber intelligent steel strand on the upper layer of the dome in one embodiment of the present invention.

[0048] Fig.10 FIG. 1 is a schematic diagram of an optical fiber intelligent steel strand in the middle layer of a dome in one embodiment of the present invention.

[0049] Fig.11 FIG. 1 is a schematic diagram of an optical fiber smart steel strand along the lower layer of a dome in one embodiment of the present invention. FIG.

[0050] Fig.12 The figure is a schematic diagram of the arrangement of the camera and the fan in one embodiment of the present invention. DETAILED DESCRIPTION

[0051] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0052] It should be noted that the illustrations provided in this embodiment are only used to illustrate the basic concept of the present invention in a schematic manner. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0053] See also Figures 1 to 4 As shown, the present invention proposes a detection system and method for the containment of a small nuclear power plant, so as to solve the problem that there is a lack of a system for comprehensive detection of various properties of the containment in the prior art, and it is difficult to achieve comprehensive detection of the containment. Specifically, the detection system includes multiple groups of sensor groups 10, a moisture resistance meter group 20, a leakage calculation module and a permeability calculation module, wherein each group of the sensor groups 10 includes at least a pressure sensor, which is arranged at different positions of the containment, and is used to obtain the air pressure difference of the air passing through the concrete at the corresponding position, and each position where the sensor group 10 is arranged is respectively arranged with a group of moisture resistance meter groups 20, and each group of moisture resistance meters 20 includes four moisture resistance meters 21, and the four moisture resistance meters 21 are arranged at different depths of the containment wall to obtain the moisture resistance depth. For example, the sensor group 10 and the moisture resistance meter group 21 can be arranged at the ring beam 11, the gate opening 12, the truncated cone 13 and the standard section 14 of the wall of the containment.

[0054] See also Figures 1 to 4 As shown, it can be understood that in this embodiment, along the circumferential direction of the containment, three groups of the moisture resistance meter groups 20 and three groups of sensor groups 10 are evenly arranged in the standard wall sections 14 above and below the opening, and two groups of the moisture resistance meter groups 20 and two groups of sensor groups 10 are arranged at the ring beam 11, the opening 12 and the truncated cone 13, respectively, for adopting the temperature, humidity, moisture resistance depth and air pressure difference of air passing through concrete at different positions of the containment, so as to calculate the leakage and permeability at various positions.

[0055] See also Figures 1 to 4 As shown, in this embodiment, the leakage calculation module is used to calculate the leakage according to the temperature, humidity and moisture resistance depth at the corresponding position and according to the preset leakage calculation model. Wherein, the preset leakage calculation model is: Q = k 修正 ·A·Δp / L, where k 修正 is the pre-calibrated corrected permeability coefficient; A is the inner wall surface area of ​​the containment; Δp is the air pressure difference; L is the wet resistance depth; Q is the leakage amount.

[0056] See also Figures 1 to 4 As shown, in this embodiment, the permeability calculation module is used to calculate the permeability according to the leakage amount, the moisture resistance depth, the cavity surface area of ​​the containment, and the air pressure difference of the air passing through the concrete, for example, by the formula The permeability is calculated. It can be understood that the permeability and leakage are deformations of the same formula. Therefore, the permeability and leakage can be verified with each other. For example, in-situ permeability detection of specific parts can be used to further verify the actual leakage rate, and the actual leakage rate of such containment in a high temperature and high humidity environment can be detected more finely.

[0057] See also Figure 1 As shown, in this embodiment, the detection system also includes a stress and strain detection subsystem, which includes a plurality of groups of strain gauges and temperature sensors arranged on the containment shell wall, and is used to detect the stress and strain of the concrete containment shell structure. A plurality of measuring points for detecting stress and strain are arranged on the wall of the containment shell, and each measuring point is arranged with three strain gauges and a temperature sensor. The measuring points include the raft foundation, cylinder, and dome connection area of ​​the containment shell, equipment gates, cylinder truncated cones, dome ring beams, buttresses, etc., wherein the three strain gauges at each measuring point are arranged to different depths along the thickness direction of the containment shell wall to obtain the stress distribution inside the shell, so as to more accurately understand the stress state of the structure, wherein the strain gauges Used to measure the deformation of the structure under load, so as to evaluate the stress state of the structure. The temperature sensor is used to detect changes in ambient temperature. Usually, the detection data will be transmitted to the monitoring center in real time through the data acquisition system for centralized processing and analysis. For example, data analysis software can be used to perform statistical analysis, trend prediction and fault diagnosis on strain and temperature changes, and form a visual report to correct the impact of temperature changes on the stress and strain of concrete, so as to provide real-time data to help engineers evaluate the health of the containment, predict potential problems, and take measures for maintenance or repair when necessary. The effectiveness of this system lies in its comprehensiveness and accuracy, which can provide important safety guarantees when the structure faces extreme conditions or long-term use.

[0058] See also Figure 5 and Figure 6 As shown, in this embodiment, the detection system also includes a deformation detection subsystem, which includes a plumb line system 101 and an indium tile line system 102 arranged in the containment along the circumferential direction and the vertical direction, which are used to detect the circumferential displacement and vertical displacement of the containment, and the deformation detection subsystem also includes an inclinometer arranged at the top and bottom of the containment, which is used to detect the inclination of the containment. It can be understood that the plumb line system 101 arranged in the containment along the circumferential direction is used to detect the vertical displacement of the containment at different positions to detect the sinking or rising of the structure due to load changes or other factors; the indium tile line system 102 arranged in the containment along the vertical direction is used to detect the horizontal displacement of the containment at different positions to evaluate the deformation of the structure, especially the circumferential deformation caused by force or temperature changes; the inclinometer arranged at the top and bottom of the containment is used to detect the inclination of the containment, and the inclinometer can detect the inclination of the structure caused by foundation settlement, load changes or other factors to ensure the verticality and stability of the structure.

[0059] See also Figure 5 and Figure 6As shown, the deformation of the containment along the circumferential direction is measured by the plumb line system 101, and the horizontal displacement of the structure can be understood. This helps to identify possible deformation modes or stress concentration areas; the vertical displacement is measured by the indium tile line system 102 to detect the vertical deformation of the structure; the inclination angle of the containment is measured by the inclinometer, and the inclination of the structure can be detected in real time. The detection of the inclination helps to discover the risk of structural instability caused by uneven settlement or other factors.

[0060] See also Figures 7 to 11 As shown, in this embodiment, the detection system also includes an optical fiber intelligent steel strand subsystem, which is arranged in the shell wall and dome of the containment, and is used to detect the prestressed tension of the prestressed steel bars of the containment. The optical fiber intelligent steel strand subsystem includes a plurality of optical fiber intelligent steel strands, which are arranged circumferentially and vertically at the wall of the containment and the dome 16 of the containment. The optical fiber intelligent steel strand subsystem can directly sense the prestress loss of the steel strand measuring point in real time, and can quantitatively control the tensioning process of the prestressed structure and the prestress change during the service period. The optical fiber intelligent steel strands are arranged in the horizontal circumferential and vertical directions, as well as in the dome position. Specifically, ordinary positions, gate opening edges and penetration opening edges, and truncated cones with greater stress can be selected. There are at least 11 optical fiber intelligent steel strands arranged vertically in the containment wall, including at least 4 first steel strands 201 near the gate opening, at least 3 second steel strands 202 near each small opening, and at least 4 third steel strands 203 arranged at positions other than the gate opening and each small opening; the optical fiber intelligent steel strands arranged in the circumferential direction on the containment wall are There are at least 7 energy-saving steel strands, including at least 4 fourth steel strands 204 near the gate opening, at least 1 fifth steel strand 205 arranged in the truncated cone, and at least 2 sixth steel strands 206 arranged at positions without openings except the gate opening and various small openings; there are at least 16 optical fiber intelligent steel strands arranged at the dome position, which include three layers distributed along the thickness direction, wherein the top layer is arranged with at least 8 seventh steel strands 207, the middle layer is arranged with at least 4 eighth steel strands 208, and the bottom layer is arranged with at least 4 ninth steel strands 209.

[0061] See also Figure 1As shown, in this embodiment, the detection system also includes a creep detection subsystem, which includes a zero stress gauge arranged on the shell wall of the containment, for detecting the long-term creep of the containment concrete. The creep detection subsystem includes a plurality of measuring points, each of which is equipped with at least one zero stress gauge, and the dome 16, the standard wall section 14, the gate opening 12, the truncated cone 13 and the bottom plate 15 of the containment are respectively provided with at least one measuring point. For example, a space for installing a zero stress gauge is reserved in the wall of the containment, and the zero stress gauge is installed in the space and partially extends into the concrete structure. The creep of the concrete is detected by detecting the value change of the zero stress gauge, so that it has the ability to detect the long-term creep of the concrete in a high temperature and high humidity environment, and can also be used to detect the long-term creep effect of the concrete in a normal environment.

[0062] It should be noted that during the installation process, it is necessary to ensure that the zero stress gauge is firmly fixed in the reserved space to prevent movement or errors after the concrete solidifies. It is understandable that the detection data of the zero stress gauge can be integrated with the data of other detection systems such as the stress strain detection system and the deformation detection system to provide a comprehensive structural health status assessment. The installation and detection of the zero stress gauge in the containment wall provides an effective means for long-term tracking of concrete creep, which helps to ensure the stability and safety of the structure in long-term operation.

[0063] See also Fig.12 As shown, in this embodiment, the detection system also includes an environmental detection subsystem, which includes a temperature sensor, a humidity sensor and a pressure sensor arranged in the containment shell, and is used to detect the temperature, humidity and pressure inside the containment shell. For example, the temperature sensor, humidity sensor and pressure sensor are arranged at different heights at the center of the shell of the containment shell. For example, it can be designed as three groups of sensors, and the three groups of detection sensors are arranged at the bottom, middle and top of the containment shell, respectively, wherein each group of sensors is composed of temperature, humidity and pressure sensors, and comprehensively detects the three environmental parameters of temperature, humidity and pressure inside the shell.

[0064] See also Fig.12As shown, in this embodiment, the environmental detection subsystem also includes a wide-angle camera 301, which is arranged on the dome 16 of the containment shell to detect the amount of water accumulated inside the shell in real time to ensure the saturation condition of water vapor. In addition, in order to ensure the performance of the containment shell when it is put into use, it is necessary to detect the containment shell to ensure that it can be put into use. Therefore, before it is put into use, it is necessary to conduct experiments on the containment shell in an environment simulating an assumed accident in a nuclear power plant. Therefore, in order to ensure that the internal environmental conditions of the containment shell are evenly distributed during the experiment, a high-pressure fan 302 is arranged inside the containment shell to accelerate the internal gas flow and promote the uniform mixing of high-temperature water vapor and air. At the same time, in order to prevent the occurrence of circumferential flow effects at the shell ring beam and the truncated cone, it is considered to arrange two high-pressure fans at the bottom of the shell and the dome respectively, and generate a counterclockwise annular flow field by adjusting the direction of the fan to promote uniform distribution of the environment.

[0065] It can be understood that, in this embodiment, the camera, temperature sensor, humidity sensor, pressure sensor and high-pressure fan can all withstand high temperature and high humidity environments to ensure normal operation within the containment vessel.

[0066] It can be understood that a high temperature and high humidity resistant environmental detection subsystem is used to comprehensively and real-time detect the three environmental parameters of temperature, humidity and pressure inside the shell, and a high-pressure fan is set to promote the uniform distribution of hot and humid steam; at the same time, these environmental detection data are connected to the control module, and the internal environmental conditions are controlled to be stable through the control module. This can more accurately simulate the high temperature and high humidity environment after a hypothetical accident in a nuclear power plant, and more accurately perform the detection of the containment leakage rate and related calculations.

[0067] See also Figure 1 As shown, the present invention also proposes a detection method for a containment of a small nuclear power plant, the detection method comprising:

[0068] Obtain the temperature, humidity, moisture resistance depth, inner wall surface area of ​​the containment and the air pressure difference of air passing through concrete at the location to be tested;

[0069] The leakage amount is calculated based on the temperature, humidity and moisture resistance depth at the corresponding position and according to a preset leakage amount calculation model;

[0070] The permeability is obtained by calculation according to the leakage amount, the moisture resistance depth, the inner wall surface area of ​​the containment vessel and the air pressure difference and in accordance with a preset permeability calculation model.

[0071] Wherein, the preset leakage calculation model is:

[0072] Q = k 修正 ·A·Δp / L, where k is the calibrated permeability coefficient obtained in advance; A is the inner wall surface area of ​​the containment; Δp is the air pressure difference; L is the wet resistance depth; Q is the leakage; wi is the weight coefficient of the product of the i-th manufacturer; C t is the temperature correction coefficient; C h is the humidity correction coefficient. It should be noted that the temperature correction coefficient is obtained based on the temperature collected by the temperature sensor, and its calculation method is: Among them, μ 20 is the air viscosity at room temperature, μ T is the air viscosity at a certain temperature, which is obtained based on the temperature collected by the temperature sensor, and the humidity correction coefficient C h It is calibrated through preset experiments and can be directly obtained based on humidity in actual application.

[0073] See also Figure 1 As shown, in this embodiment, the corrected permeability coefficient k is obtained 修正 The steps include:

[0074] Establish a test environment that is identical to the service environment of the containment under test during operation;

[0075] Test under this test environment to obtain the leakage value Q 标定 , the path length L of air through concrete 标定 , cross-sectional area A of the test area 标定 And the air pressure difference Δp 标定 ;

[0076] According to the leakage volume, the length of the air path through the concrete, the cross-sectional area of ​​the test area, the air

[0077]

[0078] A fitting formula is established according to the calibrated permeability coefficient, temperature and humidity, wherein the fitting formula is: Due to the differences in the quality of the equipment used in the test, different weight coefficients are set for the equipment provided by different manufacturers;

[0079] Test the different measuring points of the containment to be tested multiple times to obtain the temperature and humidity, and calculate the average temperature and humidity values; for example, a certain part of the containment is set with 4 measuring points, and each measuring point is measured three times, wherein the average value of the temperature and humidity data measured in the three tests is taken to obtain the average temperature and humidity values;

[0080] Obtaining a corresponding temperature correction coefficient and a humidity correction coefficient according to the temperature average value and the humidity average value;

[0081] Initialize the weight coefficient wi for each of the multiple tests, and substitute it into the fitting formula according to the calibrated permeability coefficient, the temperature correction coefficient, the humidity correction coefficient and the weight coefficient of each time, so as to calculate the weighted average of each of the multiple tests; for example, in the first test, the weight coefficient w1 of manufacturer A is 1.3, and the weight coefficient w2 of manufacturer B is 0.7; in the second test, the weight coefficient w1 of manufacturer A is 1.2, and the weight coefficient w2 of manufacturer B is 0.8; in the third test, the weight coefficient w1 of manufacturer A is 1.1, and the weight coefficient w2 of manufacturer B is 0.9, and so on. Substitute the calibrated permeability coefficient, the temperature correction coefficient, the humidity correction coefficient and the weight coefficient of each time into the fitting formula, so as to calculate the weighted average of each of the multiple tests. Of course, if there are more devices from different manufacturers, more weight coefficients can be set.

[0082] Take the median of the weighted average of each of the multiple tests as the corrected permeability coefficient k 修正 .

[0083] Of course, you can also test more times or more measurement points and set the confidence interval of the weight influence to obtain multiple modified permeability coefficients k 修正 The Z-score of the test was 1.96, with a reliability of at least 95%.

[0084] The present invention proposes a detection system and method for the containment of a small nuclear power plant, which not only realizes the high temperature and high humidity environment and non-constant pressure conditions, but also takes into account the long-term detection of concrete aging creep and the in-situ penetration detection of specific parts. It can realize the detection of stress-strain, creep, structural displacement deformation inclination and cracks of concrete and prestressed steel bars, prestressed tension of prestressed steel bars, temperature and humidity of the internal environment of the containment, actual pressure value inside the containment, in-situ permeability of specific positions of the containment and other data under the conditions of high temperature and high humidity and non-constant pressure, so as to realize comprehensive detection of the containment, and at the same time calculate the leakage rate of the containment according to the data obtained from different detections, so as to ensure the reliability and safety of the containment.

[0085] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

[0086] Except for the technical features described in the specification, the remaining technical features are known technologies to those skilled in the art. In order to highlight the innovative features of the present invention, the remaining technical features will not be described here in detail.

Claims

1. A detection system for a containment of a small nuclear power plant, characterized in that: include: A plurality of sensor groups, each of which includes at least a pressure sensor, arranged at different positions of the containment vessel, for obtaining the air pressure difference of the air at the corresponding position passing through the concrete; A humidity meter group, each position where the sensor group is arranged is respectively arranged with a group of humidity meter groups, each group of humidity meter groups includes four humidity meters, and the four humidity meters are arranged at different depths of the containment shell wall for obtaining humidity resistance depth; A leakage calculation module is used to calculate the leakage amount according to the moisture resistance depth at the corresponding position, the air pressure difference and the inner wall surface area of ​​the containment vessel and according to a preset leakage calculation model; The permeability calculation module is used to calculate the permeability according to the leakage amount, the moisture resistance depth, the inner wall surface area of ​​the containment, and the air pressure difference of the air passing through the concrete.

2. The detection system for the containment of a small nuclear power plant according to claim 1, characterized in that: The ring beam, the opening, the truncated cone and the standard section of the shell wall of the containment are respectively arranged with the moisture resistance meter group.

3. The detection system for the containment of a small nuclear power plant according to claim 2, characterized in that: Along the circumferential direction of the containment, three groups of the moisture resistance meters are evenly arranged at the standard sections of the shell wall above and below the opening, and two groups of the moisture resistance meters are arranged at the ring beam, the opening and the truncated cone, respectively.

4. The detection system for the containment of a small nuclear power plant according to claim 1, characterized in that: The preset leakage calculation model is: Q = k 修正 ·A·Δp / L, where k 修正 is the pre-calibrated corrected permeability coefficient; A is the inner wall surface area of ​​the containment; Δp is the air pressure difference; L is the wet resistance depth; Q is the leakage amount.

5. The detection system for the containment of a small nuclear power plant according to claim 1, characterized in that: It also includes a stress and strain detection subsystem, which includes multiple groups of strain gauges and temperature sensors arranged on the containment shell wall to detect the stress and strain of the concrete containment shell structure.

6. The detection system for the containment of a small nuclear power plant according to claim 5, characterized in that: The containment is provided with a plurality of measuring points, each of which is provided with three strain gauges and a temperature sensor, and the measuring points include the raft foundation, cylinder, dome connection area, equipment gate, cylinder truncated cone, dome ring beam and buttresses of the containment.

7. The detection system for the containment of a small nuclear power plant according to claim 6, characterized in that: The three strain gauges at each measuring point are arranged at different depths along the thickness direction of the containment vessel wall.

8. The detection system for the containment of a small nuclear power plant according to claim 1, characterized in that: It also includes a deformation detection subsystem, which includes a plumb line system and an indium tile line system arranged in the containment along the circumferential direction and the vertical direction, and is used to detect the circumferential displacement and the vertical displacement of the containment.

9. The detection system for the containment of a small nuclear power plant according to claim 8, characterized in that: The deformation detection subsystem also includes inclinometers arranged at the top and bottom of the containment shell, which are used to detect the inclination of the containment shell.

10. The detection system for the containment of a small nuclear power plant according to claim 1, characterized in that: It also includes an optical fiber intelligent steel strand subsystem, which is arranged in the shell wall and dome of the containment shell to detect the prestressed tension of the prestressed steel bars of the containment shell. The optical fiber intelligent steel strand subsystem includes multiple optical fiber intelligent steel strands, which are arranged circumferentially and vertically in the shell wall of the containment shell and the dome of the containment shell.

11. The detection system for the containment of a small nuclear power plant according to claim 1, characterized in that: The system also includes a creep detection subsystem, which includes a zero stress gauge arranged on the shell wall of the containment shell and is used to detect the long-term creep of the containment shell concrete.

12. The detection system for the containment of a small nuclear power plant according to claim 11, characterized in that: The creep detection subsystem includes a plurality of measuring points, each of which is equipped with at least one zero stress gauge, and the dome, wall, opening, truncated cone and bottom plate of the containment are respectively provided with at least one measuring point.

13. A method for detecting a containment vessel of a small nuclear power plant, characterized in that: include: Obtain the temperature, humidity, moisture resistance depth, inner wall surface area of ​​the containment and the air pressure difference of air passing through concrete at the location to be tested; The leakage amount is calculated based on the temperature, humidity and moisture resistance depth at the corresponding position and according to a preset leakage amount calculation model; The permeability is obtained by calculation according to the leakage amount, the moisture resistance depth, the inner wall surface area of ​​the containment vessel and the air pressure difference and in accordance with a preset permeability calculation model.

14. The method for detecting a containment vessel of a small nuclear power plant according to claim 13, characterized in that: The preset leakage calculation model is: Q = k 修正 ·A·Δp / L, where k is the calibrated permeability coefficient obtained in advance; A is the inner wall surface area of ​​the containment; Δp is the air pressure difference; L is the wet resistance depth; Q is the leakage; wi is the weight coefficient of the product of the i-th manufacturer; C t is the temperature correction coefficient; C h is the humidity correction factor.

15. The detection system for the containment of a small nuclear power plant according to claim 5, characterized in that: Get the corrected permeability coefficient k 修正 The steps include: Establish a test environment that is identical to the service environment of the containment under test during operation; Tests were conducted under this test environment to obtain the leakage volume, the path length of air through the concrete, the cross-sectional area of ​​the test area, and the air pressure difference; Obtain the calibrated permeability coefficient according to the leakage volume, the length of the path through which air passes through the concrete, the cross-sectional area of ​​the test area, and the air pressure difference; Establishing a fitting formula according to the calibrated permeability coefficient, temperature and humidity; Test the different measuring points of the containment to be tested multiple times to obtain the temperature and humidity, and calculate the average temperature and humidity values; Obtaining a corresponding temperature correction coefficient and a humidity correction coefficient according to the temperature average value and the humidity average value; Initialize the weight coefficient wi of each of the multiple tests, and substitute the calibrated permeability coefficient, the temperature correction coefficient, the humidity correction coefficient and the weight coefficient of each time into the fitting formula to calculate the weighted average of each of the multiple tests; Take the median of the weighted average of each of the multiple tests as the corrected permeability coefficient k 修正 .

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