Method for measuring pressure deformation of a nuclear power plant containment and related device

Abstract

The present application relates to the technical field of nuclear power plant containment structure deformation measurement, and discloses a pressure deformation measurement method for a nuclear power plant containment and related devices. The method comprises obtaining the outer curved surface geometric design parameters and correction parameters of the outer dome at the outer monitoring point, and the inner curved surface geometric design parameters of the inner dome at the inner monitoring point; obtaining the strain measurement value of the outer monitoring point of the outer dome under the action of the environmental load in the state that the inner shell bears the internal pressure; determining the free displacement estimation value of the outer shell at the outer monitoring point; determining the actual displacement value of the outer shell in the environment; determining the relative displacement change between the inner monitoring point and the outer monitoring point; and determining the deformation displacement of the inner shell at the inner monitoring point under the loaded state. The present application does not need to set up components such as metal wires inside the inner shell which are easily affected by temperature, but calculates the deformation displacement of the inner shell by the strain measurement value, the relative displacement measurement value, and the geometric design parameters and correction parameters, so as to weaken the interference of temperature on the measurement result.

Description

Technical Field

[0001] This invention relates to the technical field of measuring structural deformation of nuclear power plant containment structures, and particularly to a method and related apparatus for measuring pressure deformation of nuclear power plant containment structures. Background Technology

[0002] The containment vessel of a nuclear power plant is a prestressed concrete structure with protective and supporting functions. It is the core component of the structural system, one of the three main systems of a nuclear power plant. It ensures that no radioactive elements will leak in the event of a large-scale reactor leak, and it must also withstand external damage. It is the most important structural facility in a nuclear power plant. In order to measure the changes of the nuclear power plant containment vessel under various complex internal and external loads in real time over a long period of time, and to determine the performance status of the containment vessel, a series of stress and deformation measuring devices need to be installed on the containment vessel. Among them, the deformation (strain) of the containment dome is a very important indicator.

[0003] In related technologies, the containment dome is a double-shell structure, consisting of an inner shell and an outer shell. Deformation of the top of the inner shell is measured directly by suspending a metal wire within it. However, due to the temperature inside the inner shell, the metal wire also deforms, making the dome deformation measurement susceptible to temperature-related errors. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for measuring pressure deformation of the containment vessel in nuclear power plants, which can improve the accuracy of dome measurements within the containment vessel.

[0005] The present invention also proposes a pressure deformation measuring device for the containment vessel of a nuclear power plant.

[0006] The present invention also proposes an electronic device.

[0007] The present invention also proposes a computer-readable storage medium.

[0008] A method for measuring pressure deformation of a nuclear power plant containment vessel according to a first aspect of the present invention, wherein the containment vessel includes an inner shell and an outer shell, the inner shell having an inner dome and the outer shell having an outer dome, the method comprising: Obtain the geometric design parameters of the outer surface of the outer dome at the outer monitoring point and the geometric design parameters of the inner surface of the inner dome at the inner monitoring point; Obtain the correction parameters of the outer dome, wherein the correction parameters are used to convert the free displacement of the outer dome in an unconstrained state into actual displacement; Under the condition that the inner shell is subjected to internal pressure, the strain measurement value of the outer dome under the action of environmental load is obtained; Based on the external curved surface geometric design parameters and the strain measurement values, the estimated free displacement of the outer shell at the external monitoring point is determined; Based on the correction parameters and the estimated free displacement of the shell, the actual environmental displacement of the shell is determined; Under the condition that the inner shell is subjected to internal pressure and the outer shell is subjected to the environmental load, the relative displacement measurement value between the inner monitoring point and the outer monitoring point is obtained; Based on the inner surface geometric design parameters, the outer surface geometric design parameters, and the relative displacement measurement values, the relative displacement change between the inner monitoring point and the outer monitoring point is determined; Based on the actual displacement value of the outer shell environment and the relative displacement change, the deformation displacement of the inner shell at the inner monitoring point under load is determined.

[0009] Further, obtaining the correction parameters for the outer dome includes: Obtain the geometric design parameters of the outer surface of the outer dome at the outer monitoring point; Obtain the calibration data of the outer dome at the external monitoring point; The correction parameters are determined based on the calibration data and the external surface geometric design parameters.

[0010] Furthermore, obtaining the calibration data of the outer dome includes: The calibration data of the outer dome is acquired using a sensor assembly.

[0011] Furthermore, the acquisition of calibration data for the outer dome using sensor components includes: The displacement sensor acquires the displacement value between the outer monitoring point and the inner monitoring point in the environment when the inner shell is not under internal pressure and the outer shell is under environmental load. The calibration strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load.

[0012] Further, determining the correction parameters based on the calibration data and the external surface geometric design parameters includes: Based on the calibrated strain and the external surface geometric design parameters, determine the calibration value of the free displacement of the shell; Based on the displacement value between two points in the environment, the geometric design parameters of the outer curved surface, and the geometric design parameters of the inner curved surface, the environmental displacement calibration value of the shell is determined. The correction parameter is obtained by comparing the environmental displacement calibration value of the outer shell with the free displacement calibration value of the outer shell.

[0013] Further, the step of obtaining the calibration strain of the outer dome at the external monitoring point by means of strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load includes: The calibration meridional strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load. The calibrated latitudinal strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load.

[0014] Further, the step of acquiring strain measurements at external monitoring points of the outer dome under environmental loads while the inner shell is under internal pressure includes: Under the condition that the inner shell is subjected to internal pressure, the meridional strain measurement value of the outer dome at the external monitoring point under the action of environmental load is obtained; Under the condition that the inner shell is subjected to internal pressure, the latitudinal strain measurement value of the outer dome at the external monitoring point under the action of environmental load is obtained.

[0015] A second aspect of the present invention provides a deformation measurement device, comprising an input unit, a correction coefficient acquisition unit, a strain sensor, a displacement sensor, and a control unit. The input unit is used to input the outer surface geometric design parameters of the outer dome at the outer monitoring point, the inner surface geometric design parameters of the inner dome at the inner monitoring point, and the correction parameters of the outer dome. The strain sensor is disposed at the outer monitoring point of the outer dome and is used to measure the strain value of the outer dome at the outer monitoring point under environmental load. The displacement sensor is used to measure the relative displacement between the inner monitoring point and the outer monitoring point of the inner dome. The control unit is communicatively connected to the input unit, the strain sensor, the correction coefficient acquisition unit, and the displacement sensor, and is used to execute the pressure deformation measurement method for the containment vessel of a nuclear power plant as described in the first aspect of the present invention.

[0016] Furthermore, the displacement sensor includes a displacement signal generator and a displacement signal receiver; the displacement signal generator is located at an outer monitoring point of the outer dome, and the displacement signal receiver is located at an inner monitoring point of the inner dome; the displacement signal generator and the displacement signal receiver are located on the same radial direction of the containment, and are used to measure the radial relative displacement between the outer monitoring point and the inner monitoring point.

[0017] Furthermore, the strain sensor includes a warp strain sensor and a weft strain sensor, both of which are installed at the external monitoring point. The warp strain sensor is used to measure the warp strain value at the external monitoring point, and the weft strain sensor is used to measure the weft strain value at the external monitoring point.

[0018] A third aspect of the present invention provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the pressure deformation measurement method for the containment vessel of a nuclear power plant as described in the first aspect of the present invention.

[0019] A fourth aspect of the present invention provides a computer-readable storage medium storing a program that is executed by a processor to implement the pressure deformation measurement method for a nuclear power plant containment vessel as described in the first aspect of the present invention.

[0020] The pressure deformation measurement method for the containment vessel of a nuclear power plant according to embodiments of the present invention has at least the following beneficial effects: (1) Related technologies use metal wires suspended from the inner shell to directly measure the deformation of the dome. The wires are easily affected by the temperature inside the inner shell and will expand thermally, resulting in measurement errors. This invention does not require the installation of metal wires or other temperature-sensitive components inside the inner shell. Instead, it obtains the strain measurement value of the outer dome and the relative displacement measurement value between the inner and outer monitoring points, and calculates the deformation displacement of the inner shell by combining geometric design parameters and correction parameters. This effectively reduces the interference of temperature effect on the measurement results and improves the accuracy of deformation measurement of the inner shell under internal pressure. (2) There are ring beam constraints and cylinder constraints between the outer dome and the outer cylinder, and their actual deformation is not equal to the unconstrained free displacement. This invention introduces correction parameters to convert the free displacement into the actual displacement and considers the constraint effect of the shell boundary conditions, so that the shell displacement estimation is more in line with the real situation, thereby improving the reliability of the inner shell deformation inversion.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram illustrating the method of directly testing the deformation of the top of the inner shell by suspending a metal wire in the inner shell in a related technology. Figure 2 This is a schematic diagram of the pressure deformation measuring device for a nuclear power plant containment vessel according to an embodiment of the present invention. Figure 3 This is a process flow diagram of the pressure deformation measurement method for the containment vessel of a nuclear power plant according to an embodiment of the present invention; Figure 4 This is another process flow diagram of the pressure deformation measurement method for the containment vessel of a nuclear power plant according to an embodiment of the present invention; Figure 5 This is another process flow diagram of the pressure deformation measurement method for the containment vessel of a nuclear power plant according to an embodiment of the present invention; Figure 6 This is another process flow diagram of the pressure deformation measurement method for the containment vessel of a nuclear power plant according to an embodiment of the present invention; Figure 7 This is another process flow diagram of the pressure deformation measurement method for the containment vessel of a nuclear power plant according to an embodiment of the present invention; Figure 8 This is another process flow diagram of the pressure deformation measurement method for the containment vessel of a nuclear power plant according to an embodiment of the present invention. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0025] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "outer" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0026] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0027] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] The containment vessel of a nuclear power plant is a prestressed concrete structure with protective and supporting functions. It is the core component of the structural system, one of the three main systems of a nuclear power plant. It ensures that no radioactive elements will leak in the event of a large-scale reactor leak, and it must also withstand external damage. It is the most important structural facility in a nuclear power plant. In order to measure the changes of the nuclear power plant containment vessel under various complex internal and external loads in real time over a long period of time, and to determine the performance status of the containment vessel, a series of stress and deformation measuring devices need to be installed on the containment vessel. Among them, the deformation (strain) of the containment dome is a very important indicator.

[0029] like Figure 1 As shown, in related technologies, the containment dome has a double-shell structure, consisting of an inner shell and an outer shell. Deformation of the top of the inner shell is directly tested by suspending a metal wire within it. However, due to the temperature inside the inner shell, the metal wire also deforms, making the dome deformation measurement susceptible to temperature-related errors.

[0030] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a method for measuring pressure deformation of the containment vessel in nuclear power plants, which can improve the accuracy of dome measurements within the containment vessel.

[0031] The following is an appendix Figure 2 -Appendix Figure 8 Further explanation will be provided based on this.

[0032] Reference Figure 2 According to a first aspect of the present invention, the method for measuring pressure deformation of a nuclear power plant containment vessel includes an inner shell and an outer shell. The inner shell includes an inner cylinder and an inner dome, and the outer shell has an outer cylinder and an outer dome. The inner dome is fixedly connected to the axial top end of the inner cylinder, and the outer dome is fixedly connected to the axial top end of the outer cylinder.

[0033] The outer dome and the inner dome share the same center of rotational symmetry.

[0034] The outer dome includes a first spherical shell segment and a second spherical strip shell segment arranged coaxially, with the first spherical shell segment and the second spherical strip shell segment smoothly connected. The inner dome includes a third spherical shell segment and a fourth spherical strip shell segment arranged coaxially, with the third spherical shell segment and the fourth spherical strip shell segment smoothly connected.

[0035] The first spherical crown-shaped shell segment and the second spherical strip-shaped shell segment have different radii relative to the center of rotational symmetry; The radii of the third spherical crown-shaped shell segment and the fourth spherical band-shaped shell segment are different relative to the center of rotational symmetry.

[0036] Reference Figure 3 The method includes the following steps: S100: Obtain the geometric design parameters of the outer surface of the outer dome at the external monitoring points. Geometric design parameters of the inner curved surface of the inner dome at the internal monitoring point ; External monitoring points are pre-selected monitoring locations on the outer dome by those skilled in the art based on measurement requirements, while internal monitoring points are pre-selected monitoring locations on the inner dome. For example, when it is necessary to monitor the effect of inner shell pressurization on the displacement of the dome apex, the internal monitoring point can be set at the apex of the inner dome. Both the external and internal surface geometric design parameters are geometric design parameters of the containment, characterizing the geometric dimensions of the containment in an unloaded state (i.e., without environmental loads and without internal pressure on the inner shell). Specifically, the external surface geometric design parameters at the external monitoring points on the outer dome can be read from the containment's design drawings or theoretical models. And the geometric design parameters of the inner curved surface at the monitoring point on the inner dome. .

[0037] S200: Obtain the correction parameters for the outer dome. Correct parameters Used to convert the free displacement of the outer dome under unconstrained conditions into actual displacement; It should be noted that there is a ring beam constraint between the outer dome and the outer cylinder, and the outer cylinder itself constitutes a boundary constraint on the outer dome. Therefore, the free displacement of the outer dome in the unconstrained state cannot be directly taken as its actual displacement, and it is necessary to correct the parameters. Perform the conversion. Optionally, correct the parameters. It can be determined through finite element simulation, calibration test data, or standard empirical formulas.

[0038] S300: Under the condition of internal pressure on the inner shell, obtain the strain measurement values ​​of the external monitoring points of the outer dome under environmental loads. ; Environmental loads refer to various forces and effects exerted on the external dome of the structure due to changes in the external environment during the operation and testing phases, including wind loads and temperature loads. Strain measurements. The strain values ​​obtained for the outer dome under the combined effects of wind load and temperature load are given.

[0039] S400: Based on External Surface Geometric Design Parameters and strain measurement values Determine the estimated free displacement of the outer shell at the external monitoring point. ; For example, based on the small deformation theory, the strain measurement value of the outer dome Multiplying by its own radius gives its free displacement in the unconstrained state: ; S500: Determine the actual environmental displacement of the shell based on the corrected parameters and the estimated free displacement of the shell. ; When the outer dome is an ideal spherical cap and there are no structural constraints, then However, the outer shell comprises an outer cylinder and an outer dome, with the outer dome fixedly connected to the outer cylinder. The outer dome is constructed of smoothly connected spherical segments of different radii, and there is a ring beam constraint between the outer dome and the outer cylinder. The outer cylinder also provides boundary constraints to the outer dome. They will not be exactly equal. Furthermore, because the containment vessel remains in an elastic deformation phase throughout the inner shell pressurization test, and Linear correlation.

[0040] Based on this, we can conclude that: .

[0041] S600: Under conditions where the inner shell is subjected to internal pressure and the outer shell is subjected to environmental loads, the relative displacement measurement values ​​between the inner and outer monitoring points are obtained. ; Under this operating condition, environmental loads act on the outer shell, causing the position of the outer dome at the external monitoring point to change. The displacement change of the outer dome at the external monitoring point is denoted as... When the inner shell is pressurized, the position of the inner dome at the internal monitoring point will change. The displacement change of the inner dome at the internal monitoring point is recorded as follows: At this point, the relative displacement measurements of the internal and external monitoring points are obtained. Relative displacement measurement value Including the initial distance between internal and external monitoring points The displacement change values ​​of the outer dome at the external monitoring points are recorded. The displacement change value of the monitoring point inside the inner dome is recorded as follows: .

[0042] Therefore, ; S700: Based on the geometric design parameters of the inner surface and the outer surface, and the relative displacement measurement values, determine the relative displacement change between the inner and outer monitoring points. ; It is understandable that the initial distance Lr between the outer and inner monitoring points can be obtained by using the radius values ​​between the inner monitoring point and the center of rotational symmetry, and the radius values ​​between the outer monitoring point and the center of rotational symmetry. The relative displacement change can then be calculated. Specifically: .

[0043] S800: Based on the actual displacement value and relative displacement change of the outer shell environment, determine the deformation displacement of the inner shell at the inner monitoring point under load. .

[0044] Combining the above formula, It is possible to obtain: .

[0045] It should be further noted that the outer dome and the inner dome share the same center of rotational symmetry. , The direction away from the center of rotational symmetry is positive, and the direction closer to the center of rotational symmetry is negative.

[0046] The pressure deformation measurement method for the containment vessel of a nuclear power plant according to embodiments of the present invention has at least the following beneficial effects: (1) Related technologies use metal wires suspended from the inner shell to directly measure the deformation of the dome. The wires are easily affected by the temperature inside the inner shell and will expand thermally, leading to measurement errors. This invention does not require the installation of metal wires or other temperature-sensitive components inside the inner shell. Instead, it obtains the strain measurement value of the outer dome and the relative displacement measurement value between the inner and outer monitoring points, and indirectly calculates the deformation displacement of the inner shell by combining geometric design parameters and correction parameters. This effectively reduces the interference of temperature effect on the measurement results and improves the accuracy of deformation measurement of the inner shell under internal pressure. (2) There are ring beam constraints and cylinder constraints between the outer dome and the outer cylinder, and their actual deformation is not equal to the unconstrained free displacement. This invention introduces correction parameters to convert the free displacement into the actual displacement and considers the constraint effect of the shell boundary conditions, so that the shell displacement estimation is more in line with the real situation, thereby improving the reliability of the inner shell deformation inversion.

[0047] Reference Figure 4 Furthermore, S200: Obtain the correction parameters for the outer dome, including the following sub-steps: S401: Obtain calibration data of the outer dome at the external monitoring points; Calibration data is used to reflect the displacement and deformation response characteristics of the external dome under the same excitation. Specifically, calibration data includes two sets of physical quantities obtained directly or indirectly through finite element simulation, scaled-down model tests, or field loading tests under the same external load conditions: the actual calibrated displacement value at the external monitoring point and the calibrated strain at the external monitoring point.

[0048] Optionally, the calibration process can apply a unit strain to the outer dome, obtain the theoretical free displacement corresponding to the unit strain, and at the same time obtain the actual calibration displacement value of the outer dome, and use the theoretical free displacement corresponding to the unit strain and the actual calibration displacement value as calibration data. Optionally, the calibration process can be performed on the actual containment structure, using real environmental loads (such as wind loads, temperature loads, etc.) as excitation sources, without the need for a finite element model or additional loading equipment. Under calibration conditions, the inner shell is not yet subjected to internal pressure. Under environmental loads, the outer dome deforms, causing strain and actual displacement at the external monitoring points. The calibration data is obtained by simultaneously measuring the calibration strain and the environmental displacement calibration value of the outer shell.

[0049] S402: Determine the correction parameters based on calibration data, external surface geometric design parameters, and internal surface geometric design parameters. .

[0050] Optionally, when applying unit strain to the external dome: divide the calibrated actual displacement value by the theoretical free displacement corresponding to the unit strain to obtain the correction parameter. ; Optionally, when the test is performed on the actual containment structure and using real environmental loads (such as wind loads, temperature loads, etc.) as the excitation source: the correction parameter is obtained by dividing the environmental displacement calibration value of the containment by the calibration strain. .

[0051] The boundary conditions of the outer dome of different containments (such as ring beam stiffness, shell connection method, and material properties) may vary. Determining correction parameters by obtaining calibration data specific to the structure through actual measurements or simulations, rather than using general empirical values, allows the correction parameters to accurately reflect the structure's own constraint characteristics. This enables a more precise conversion of free displacement into actual displacement, further improving the accuracy of inner shell deformation displacement inversion.

[0052] Reference Figure 5 Furthermore, S401: Acquire calibration data of the outer dome, including acquiring calibration data of the outer dome using sensor components.

[0053] Sensor assemblies refer to a class of devices or systems capable of sensing and measuring physical quantities such as displacement, strain, and force. For example, they may include displacement sensors (such as laser displacement gauges and LVDTs), strain sensors (such as resistance strain gauges and fiber Bragg grating strain sensors), or combinations of force sensors and actuators for applying known loads. Sensor assemblies can be selected in one or more combinations depending on calibration requirements.

[0054] Specifically, the calibration data of the outer dome is acquired using sensor components, including: S501: The displacement value between the outer monitoring point and the inner monitoring point in the environment is obtained by a displacement sensor when the inner shell is not under internal pressure and the outer shell is under environmental load. The displacement value between the two environmental points is the distance between the outer monitoring point and the inner monitoring point.

[0055] Optionally, since there is no internal pressure in the inner shell during calibration, the deformation of the inner shell can be ignored. Therefore, by measuring the displacement changes between the outer monitoring point and a fixed reference point (a reference monitoring point independent of the containment structure), and between the inner monitoring point on the inner dome and a fixed reference point, the environmental displacement calibration value of the outer shell at the outer monitoring point is indirectly calculated based on the geometric relationship between the inner monitoring point, the outer monitoring point, and the fixed reference point.

[0056] Optionally, a fixed reference point is directly set on the inner monitoring point to directly measure the displacement value between the outer and inner monitoring points under environmental load.

[0057] S502: The calibration strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load.

[0058] For example, during formal measurements, strain and relative displacement measurements under environmental loads also need to be obtained. The calibration phase uses the exact same sensor set and measurement principle, differing only in the presence or absence of internal pressure (no internal pressure during calibration, internal pressure during formal measurements). This consistency allows sensor drift, installation errors, and temperature effects to cancel each other out during calibration and measurement, further improving measurement accuracy.

[0059] Reference Figure 6 Furthermore, S402: Based on the calibration data, determine the correction parameters, including the following sub-steps: S601: Determine the calibration value of the free displacement of the shell based on the calibrated strain and the geometric design parameters of the outer surface; The calibration process can be performed on the actual containment structure, using real environmental loads (such as wind loads and temperature loads) as excitation sources, without the need for a finite element model or additional loading equipment. In the calibration state, the inner shell is not yet subjected to internal pressure. Under environmental loads, the outer dome deforms, causing strain and actual displacement at the external monitoring points. The strain is calibrated by synchronous measurement. The environmental displacement calibration value of the outer casing and the outer casing are used as calibration data.

[0060] calibrating the dependent variable : The strain value obtained by strain sensors at monitoring points outside the outer dome.

[0061] External surface geometric design parameters The radius of curvature corresponding to the external monitoring point on the outer dome.

[0062] According to the small deformation theory, under ideal unconstrained conditions, the relationship between strain and arc-length displacement is as follows: (Sheet free displacement calibration value) . This indicates the free displacement that should occur if the outer dome were completely free (without constraints such as ring beams or tubes).

[0063] S602: Determine the environmental displacement calibration value of the shell based on the displacement value between two points in the environment, the geometric design parameters of the outer curved surface, and the geometric design parameters of the inner curved surface; Since there is no internal pressure in the inner shell during calibration, the deformation of the inner shell can be ignored. The displacement values ​​between the two environmental points are measured between the outer and inner monitoring points. External surface geometric design parameters and inner surface geometric design parameters By performing calculations, the environmental displacement calibration value of the outer casing at the external monitoring point can be obtained. ,Right now = -(R1-R2).

[0064] S603: Set the environmental displacement calibration value of the outer casing. and shell free displacement calibration value Divide to obtain the correction parameter .

[0065] Furthermore, S502: The calibration strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load. ,include: S701: The calibration meridional strain of the outer dome at external monitoring points is obtained using strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load. ; Meridional direction refers to the direction along the generatrix of the outer dome, that is, the direction of the curve extending from the apex of the outer dome to the edge.

[0066] The inner shell has not yet been subjected to internal pressure, while the outer shell is under environmental load. It reflects the linear strain along the meridian at the external monitoring point of the outer dome.

[0067] S702: The calibration latitudinal strain of the outer dome at external monitoring points is obtained using strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load. .

[0068] The latitudinal direction refers to the circumferential direction along the outer dome, that is, the direction perpendicular to the meridian.

[0069] For example, under calibration conditions (no internal pressure in the inner shell, and environmental load on the outer shell), the calibration meridional strain of the outer dome at the external monitoring points was measured using strain sensors. and calibration of lateral strain To calculate the calibration value of the free displacement of the shell. The orthogonal direction of the calibrated meridional strain needs to be adjusted. and calibration of lateral strain Combined into an equivalent standardized dependent variable .

[0070] The formula means that the arithmetic mean of the longitudinal and latitudinal strains is taken as the equivalent strain. The physical basis of this approach can be understood as follows: the dome surface undergoes three-dimensional deformation under environmental loads, and the arc length elongation at the external monitoring point is affected not only along the longitudinal direction but also by circumferential (latitudinal) deformation. In the theory of small deformations of shells, to estimate the equivalent radial displacement of a representative point, a simplified method is to use the average of the strains in the two principal directions to approximate the generalized strain level at that point, especially when the dome approximates a spherical shell and the load is mainly distributed radially, the strain contributions in the two directions are similar. Using the arithmetic mean can balance the influence of the two directions, avoiding deviations in a single direction caused by local constraints or load asymmetry.

[0071] Reference Figure 8 Furthermore, in step S300, under the condition that the inner shell is subjected to internal pressure, the strain measurement values ​​of the outer monitoring points of the outer dome under environmental loads are obtained. This includes the following specific steps: S801: Under the condition of internal pressure on the inner shell, obtain the meridional strain measurement value of the outer monitoring point of the outer dome under environmental load. ; S802: Under the condition of internal pressure on the inner shell, obtain the zonal strain measurement value of the outer dome at the external monitoring point under environmental load. .

[0072] Accordingly, The meaning of the formula is: take the arithmetic mean of the longitudinal strain and the latitudinal strain as the equivalent strain.

[0073] As can be seen from the above embodiments, the calibration longitudinal strain was also obtained during calibration. and calibration of lateral strain During formal measurements, the exact same sensor placement orientation and data processing method are used to ensure consistency.

[0074] In a specific embodiment of the present invention, the above-mentioned pressure deformation measurement method is described in detail using a double containment structure of a nuclear power plant as an example.

[0075] Measurement point arrangement: At the outer monitoring point of the outer dome, a strain sensor (resistive strain gauge or fiber optic strain sensor can be used) is installed along the longitudinal and latitudinal directions, denoted as a1 and a2 respectively. At the same time, a displacement sensor L (such as a laser displacement gauge or wire displacement sensor) is installed between the inner monitoring point of the inner dome and the outer monitoring point of the outer dome to directly measure the relative displacement change between the inner and outer monitoring points.

[0076] Because the outer shell of the containment vessel has excellent protective and thermal insulation properties, when the external ambient temperature changes, the outer surface of the shell is directly exposed to the ambient temperature, but the shell itself provides protection, so that the temperature of the space between the inner and outer shells and inside the inner shell hardly changes with the external ambient temperature. Therefore, it can be considered that the deformation of the outer shell is mainly affected by the ambient temperature (and wind load, etc.); the inner shell hardly deforms when it is not pressurized, and its deformation is only caused by the internal pressure.

[0077] Calibration: Under conditions where the inner shell is not yet subjected to internal pressure, external environmental loads (such as diurnal temperature variation, sunlight, wind, etc.) act on the outer shell. At this time, the relative displacement value measured by the displacement sensor reflects the displacement change of the monitoring point outside the shell relative to the monitoring point inside, and is recorded as the displacement value between the two points under this operating condition. Strain sensors a1 and a2 respectively measure the calibrated meridional strain. and calibration of lateral strain .

[0078] Since there is no internal pressure in the inner shell, the position of the internal monitoring point remains unchanged; therefore, the environmental displacement calibration value of the outer shell is... : ;in The initial distance between the inner and outer monitoring points can be calculated based on the geometric design parameters R1 and R2 of the inner and outer curved surfaces and the positions of the inner and outer monitoring points.

[0079] Simultaneously, the arithmetic mean of the strains in both directions is taken to obtain the equivalent calibrated strain: ; According to the small deformation theory, the calibration value of the free displacement of the shell is: ; Then correct the parameters Determined by the following formula: .

[0080] Correction parameters It reflects the constraint effect of the ring beam and cylinder on the free displacement of the shell, which is constant within the elastic range.

[0081] Formal measurement phase (inner shell pressurization): When the inner shell is subjected to internal pressure (e.g., during a pressure test), the inner dome deforms at the internal monitoring points due to the internal pressure. (Value to be determined). Meanwhile, the outer shell continues to bear environmental loads, resulting in environmentally induced deformation at the external monitoring points. The relative displacement measured by the displacement sensor. Including the initial distance between internal and external monitoring points The displacement change values ​​of the outer dome at the external monitoring points are recorded. The displacement change value of the monitoring point inside the inner dome is recorded as follows: : Therefore, ; Under internal pressure on the inner shell, the meridional strain measurements of the outer dome at external monitoring points under environmental loads were obtained. ; Under internal pressure on the inner shell, the zonal strain measurements of the outer dome at external monitoring points under environmental loads were obtained. .

[0082] Accordingly, ; Correction parameters obtained from calibration Calculate the actual displacement of the shell environment : ; Then the deformation displacement of the inner shell can be obtained. : .

[0083] Through continuous monitoring , , It can be calculated online in real time. This allows us to obtain the pure deformation of the inner shell dome under internal pressure, effectively eliminating interference from ambient temperature and wind loads. The results can be used for containment structure performance evaluation and long-term health monitoring.

[0084] A second aspect of the present invention provides a deformation measurement device, which includes an input unit, a strain sensor, a displacement sensor, and a control unit. The input unit is used to input the geometric design parameters of the outer surface of the outer dome at the outer monitoring point, the geometric design parameters of the inner surface of the inner dome at the inner monitoring point, and the correction parameters of the outer dome. The strain sensor is located at the outer monitoring point of the outer dome and is used to measure the strain value of the outer dome at the outer monitoring point under environmental load. The displacement sensor is used to measure the relative displacement between the inner and outer monitoring points of the inner dome. The control unit is communicatively connected to the input unit, the strain sensor, and the displacement sensor, and is used to execute the pressure deformation measurement method for the containment vessel of a nuclear power plant according to the first aspect of the present invention.

[0085] The deformation measuring device according to the present invention has at least the following beneficial effects: the device does not require the installation of metal wires or other components that are susceptible to temperature effects inside the inner shell, but instead uses the strain measurement value of the outer dome and the relative displacement measurement value between the inner and outer monitoring points, combined with geometric design parameters and correction parameters, to indirectly calculate the deformation displacement of the inner shell, effectively reducing the interference of temperature effects on the measurement results and significantly improving the accuracy of deformation measurement of the inner shell under internal pressure.

[0086] Furthermore, the displacement sensor includes a displacement signal generator and a displacement signal receiver; the displacement signal generator is located at an outer monitoring point on the outer dome, and the displacement signal receiver is located at an inner monitoring point on the inner dome; the displacement signal generator and the displacement signal receiver are located on the same radial direction of the containment, and are used to measure the radial relative displacement between the outer and inner monitoring points. The displacement signal generator and receiver are arranged along the same radial direction of the containment, and the measured radial relative displacement is the displacement value between the two environmental points (during calibration) and the relative displacement measurement value (during formal measurement) directly needed in subsequent calculations. This eliminates the need for coordinate transformation, vector decomposition, or geometric projection calculations, significantly reducing the computational burden on the control unit and minimizing additional errors introduced by coordinate transformation.

[0087] Furthermore, the strain sensors include meridional strain sensors and zonal strain sensors, both installed at the external monitoring points. The meridional strain sensor measures the meridional strain value at the external monitoring point, and the zonal strain sensor measures the zonal strain value at the external monitoring point. Under environmental loads (wind, temperature gradient, solar radiation, etc.), the external dome experiences not only tension or compression along the meridional direction, but also significant strain in the zonal direction due to the Poisson effect and curvature changes. Measuring only one direction will result in the loss of deformation information; simultaneously acquiring meridional and zonal strains can comprehensively describe the strain tensor at the monitoring points, providing a basis for subsequent equivalent strain calculations.

[0088] A third aspect of the present invention provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the pressure deformation measurement method for the containment vessel of a nuclear power plant as described in the first aspect of the present invention.

[0089] A fourth aspect of the present invention provides a computer-readable storage medium storing a program that is executed by a processor to implement the pressure deformation measurement method for the containment vessel of a nuclear power plant as described in the first aspect of the present invention.

[0090] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A method for measuring pressure deformation of a nuclear power plant containment vessel, characterized in that, The containment structure includes an inner shell and an outer shell, the inner shell having an inner dome and the outer shell having an outer dome, the method comprising: Obtain the geometric design parameters of the outer surface of the outer dome at the outer monitoring point and the geometric design parameters of the inner surface of the inner dome at the inner monitoring point; Obtain the correction parameters of the outer dome, wherein the correction parameters are used to convert the free displacement of the outer dome in an unconstrained state into actual displacement; Under the condition that the inner shell is subjected to internal pressure, the strain measurement value of the outer dome under the action of environmental load is obtained; Based on the external curved surface geometric design parameters and the strain measurement values, the estimated free displacement of the outer shell at the external monitoring point is determined; Based on the correction parameters and the estimated free displacement of the shell, the actual environmental displacement of the shell is determined; Under the condition that the inner shell is subjected to internal pressure and the outer shell is subjected to the environmental load, the relative displacement measurement value between the inner monitoring point and the outer monitoring point is obtained; Based on the inner surface geometric design parameters, the outer surface geometric design parameters, and the relative displacement measurement values, the relative displacement change between the inner monitoring point and the outer monitoring point is determined; Based on the actual displacement value of the outer shell environment and the relative displacement change, the deformation displacement of the inner shell at the inner monitoring point under load is determined.

2. The method for measuring pressure deformation of a nuclear power plant containment vessel according to claim 1, characterized in that, Obtaining the correction parameters of the outer dome includes: The calibration data of the outer dome at the external monitoring point is obtained. The calibration data is used to reflect the displacement response characteristics and deformation response characteristics of the outer dome to the same excitation. The correction parameters are determined based on the calibration data, the outer surface geometric design parameters, and the inner surface geometric design parameters.

3. The method for measuring pressure deformation of a nuclear power plant containment vessel according to claim 2, characterized in that, The process of obtaining the calibration data of the outer dome includes: The calibration data of the outer dome is acquired using a sensor assembly.

4. The method for measuring pressure deformation of a nuclear power plant containment vessel according to claim 3, characterized in that, The process of acquiring calibration data for the outer dome using sensor components includes: The displacement sensor acquires the displacement value between two environmental points when the outer shell is under environmental load and the inner shell is not under internal pressure. The displacement value between the two environmental points is the distance between the outer monitoring point and the inner monitoring point. The calibration strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load.

5. The method for measuring pressure deformation of a nuclear power plant containment vessel according to claim 4, characterized in that, Based on the calibration data, the outer surface geometric design parameters, and the inner surface geometric design parameters, the correction parameters are determined, including: Based on the calibrated strain and the external surface geometric design parameters, determine the calibration value of the free displacement of the shell; Based on the displacement value between two points in the environment, the geometric design parameters of the outer curved surface, and the geometric design parameters of the inner curved surface, the environmental displacement calibration value of the shell is determined. The correction parameter is obtained by comparing the environmental displacement calibration value of the outer shell with the free displacement calibration value of the outer shell.

6. The method for measuring pressure deformation of a nuclear power plant containment vessel according to claim 4, characterized in that, The method of obtaining the calibration strain of the outer dome at the external monitoring point by means of strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load includes: The calibration meridional strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load. The calibrated latitudinal strain of the outer dome at the external monitoring point is obtained by strain sensors when the inner shell is not under internal pressure and the outer shell is under environmental load.

7. The method for measuring pressure deformation of a nuclear power plant containment vessel according to claim 1, characterized in that, The process of acquiring strain measurements at external monitoring points of the outer dome under environmental loads while the inner shell is under internal pressure includes: Under the condition that the inner shell is subjected to internal pressure, the meridional strain measurement value of the outer dome at the external monitoring point under the action of environmental load is obtained; Under the condition that the inner shell is subjected to internal pressure, the latitudinal strain measurement value of the outer dome at the external monitoring point under the action of environmental load is obtained.

8. A pressure deformation measuring device for the containment vessel of a nuclear power plant, characterized in that, include: The input unit is used to input the geometric design parameters of the outer surface of the outer dome at the outer monitoring point and the geometric design parameters of the inner surface of the inner dome at the inner monitoring point; The correction coefficient acquisition unit is used to acquire the correction parameters of the outer dome; A strain sensor is installed at the outer monitoring point of the outer dome to measure the strain of the outer dome at the outer monitoring point under environmental load. A displacement sensor is used to measure the relative displacement between the inner monitoring point and the outer monitoring point of the inner dome. The control unit is communicatively connected to the input unit, the strain sensor, the correction coefficient acquisition unit, and the displacement sensor, and is used to execute the pressure deformation measurement method for the containment vessel of a nuclear power plant as described in any one of claims 1-7.

9. The pressure deformation measuring device for a nuclear power plant containment vessel according to claim 8, characterized in that, The displacement sensor includes a displacement signal generator and a displacement signal receiver; The displacement signal generator is located at the outer monitoring point of the outer dome, and the displacement signal receiver is located at the inner monitoring point of the inner dome. The displacement signal generator and the displacement signal receiver are located on the same radial direction of the containment, and are used to measure the radial relative displacement between the outer monitoring point and the inner monitoring point.

10. The pressure deformation measuring device for a nuclear power plant containment vessel according to claim 8, characterized in that, The strain sensor includes a warp strain sensor and a weft strain sensor, both of which are installed at the external monitoring point. The warp strain sensor is used to measure the warp strain value at the external monitoring point, and the weft strain sensor is used to measure the weft strain value at the external monitoring point.

11. An electronic device, characterized in that, include: The device includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the pressure deformation measurement method for the containment vessel of a nuclear power plant as described in any one of claims 1 to 7.

12. A computer-readable storage medium, characterized in that, The storage medium stores a program that is executed by a processor to implement the pressure deformation measurement method for the containment vessel of a nuclear power plant as described in any one of claims 1 to 7.

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