JP2012107959A - Ultrasonic flaw inspection device and ultrasonic flaw inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultrasonic flaw inspection device and an ultrasonic flaw inspection method capable of shortening working time and reducing the risk of erroneously recognizing a noise signal as a defect signal caused by a defect.SOLUTION: The ultrasonic flaw inspection device has: a probe part that is inserted into a pipe member of a heat exchanger and propagates a guide wave to the pipe member; an ultrasonic transmission/reception part that is capable of transmitting an ultrasonic wave which serves as the guide wave via the probe part and receiving a reflecting wave of the guide wave propagated to the pipe member; and a control device capable of controlling the probe part and the ultrasonic transmission/reception part. The control device determines a noise signal or a defect signal in measurement data by performing signal processing on a plurality of measurement data that are acquired in different measurement conditions at the ultrasonic transmission/reception part.

Description

  The present invention relates to an ultrasonic flaw detection inspection apparatus and an ultrasonic flaw detection inspection method for inspecting heat exchangers or pipes nondestructively.

  In heat exchangers installed in thermal power plants, nuclear power plants, etc., high-temperature, high-pressure fluid, etc. will be passed through the piping, so it is necessary to inspect the piping for flaws, cracks, thinning, etc. . In general, inspection of piping is performed by nondestructive inspection using ultrasonic waves. As an ultrasonic probe used for nondestructive inspection, for example, there is an in-pipe ultrasonic probe inserted by running water (Patent Document 1).

  Patent Document 2 discloses a method of inspecting a heat exchanger tube using a guide wave, and this method inserts a columnar wave guide probe into an open end of the heat exchanger tube, and the wave guide. The connecting end portion of the probe is disposed at a distance from the open end portion at least a distance from the open end portion to the heat exchanger tube sheet, and an electron transmission pulse is attached to the wave guide probe. Applied to a strain sensor, the magnetostrictive sensor generates and transmits a torsion wave pulse in the wave guiding probe, and propagates the transmitted torsion wave along the length of the heat exchanger tube. The wave guide probe to the inner wall of the heat exchanger tube, the defect of the heat exchanger tube and the reflected torsion wave signal from the far end are connected to the wave guide probe, and the reflected torsion wave Magnetostriction signal Detected by Nsa, to determine the location and characteristics of the defects in the heat exchanger tube wall, electronically processing the detected signals, techniques including each step is described.

Japanese Patent Laid-Open No. 7-049336 Special table 2007-514140 gazette

  However, the in-pipe ultrasonic probe described in Patent Document 1 needs to be transported over the entire length of the pipe, and the work time may increase when the pipe is long or many. In addition, in the method of inspecting a heat exchanger tube using the reflected torsional wave described in Patent Document 2, in addition to the defect signal due to defects such as scratches, cracks, thinning, etc. that are to be inspected originally, Since a noise signal caused by a circuit, a transmitter, or the like is measured, the noise signal may be mistaken for a defect signal caused by a defect.

  The present invention solves the above-described problems, and reduces the working time and reduces the risk of misidentifying a noise signal as a defect signal caused by a defect. The purpose is to provide.

  In order to achieve the above-described object, an ultrasonic flaw detection inspection apparatus according to the present invention includes a probe unit that is inserted into a tube member of a heat exchanger and propagates a guide wave to the tube member, and the probe unit is configured to transmit the guide wave through the probe unit. An ultrasonic transmission / reception unit capable of transmitting an ultrasonic wave as a guide wave and receiving a reflected wave of the guide wave propagated to the tube member; and a control device capable of controlling the probe unit and the ultrasonic transmission / reception unit; The control device is characterized in that a noise signal or a defect signal of measurement data is specified by performing signal processing on a plurality of measurement data in the ultrasonic transmission / reception unit under different measurement conditions.

  For this reason, it is possible to reduce a possibility that a noise signal caused by an electric circuit of the probe unit, an ultrasonic probe, or the like is measured and the noise signal caused by the defect is mistaken as a defect signal. As a result, in the inspection of a long structure, it is possible to grasp defects such as scratches, cracks, and thinning even if ultrasonic inspection using a guide wave is performed.

  As a desirable aspect of the present invention, the ultrasonic flaw detection inspection apparatus of the present invention further includes a length adjusting means for changing a length of insertion of the probe into the tube member, and the control apparatus includes the length adjusting means. It is preferable to control and set the different measurement conditions. This eliminates the need for the ultrasonic probe to be transported over the entire length of the pipe, thereby reducing the work time.

  As a desirable mode of the present invention, the ultrasonic flaw detection inspection apparatus according to the present invention includes a plurality of measurement data in the ultrasonic transmission / reception unit while changing the length of insertion of the probe unit into the tube member as the different measurement conditions. It is preferable to obtain By capturing the movement of the waveform signal, it is possible to easily identify a noise signal or a defect signal.

  As a desirable mode of the present invention, the ultrasonic flaw detection inspection apparatus of the present invention preferably acquires a plurality of measurement data as the different measurement conditions by changing the input frequency in the ultrasonic transmission / reception unit. Thereby, an unnecessary waveform signal including a transmission wave generated in the vicinity of the probe unit can be reduced, and the defect signal can be easily seen.

  As a desirable mode of the present invention, an ultrasonic flaw detection inspection apparatus according to the present invention is capable of transmitting a plurality of probe parts and ultrasonic waves serving as the guide wave via the probe parts and propagating to the tube member. An ultrasonic transmission / reception unit capable of receiving a wave, and as the different measurement conditions, each of the measurement data measured by different probe units among the plurality of probe units may be compared with the tube member of the heat exchanger. preferable. Thereby, the noise signal resulting from the individual difference of a probe part can be reduced, and a defect signal can be made easy to see.

  As a desirable mode of the present invention, an ultrasonic flaw detection inspection apparatus according to the present invention is an ultrasonic flaw detection inspection apparatus that measures a heat exchanger having a plurality of tube members, and includes a plurality of probe portions and respective probe portions. An ultrasonic transmission / reception unit capable of transmitting an ultrasonic wave as the guide wave and receiving a guide wave propagated to the tube member, and the plurality of probe units can inspect the plurality of tube members simultaneously. It is preferable that For this reason, since a plurality of probe parts having different input frequencies in the ultrasonic transmission / reception part are inserted into the plurality of heat transfer tubes and measured, a plurality of heat transfer tubes can be inspected simultaneously. Thereby, a heat exchanger tube can be inspected in a short time.

  As a desirable mode of the present invention, the ultrasonic flaw detection inspection apparatus according to the present invention is characterized in that the control device noises a waveform signal in which a reception signal is fluctuated among a plurality of measurement data in the ultrasonic transmission / reception unit under different measurement conditions. It is preferable to judge it as a signal. This can reduce the possibility of misidentifying a noise signal as a defect signal due to a defect.

  As a desirable mode of the present invention, the ultrasonic flaw detection inspection apparatus of the present invention performs a signal processing of any one or more of addition, subtraction, and multiplication of a plurality of measurement data, captures a change in signal intensity after signal processing, and detects noise. Preferably a signal or defect signal is identified. This can reduce the possibility of misidentifying a noise signal as a defect signal due to a defect.

  In order to achieve the above object, the ultrasonic flaw detection inspection method of the present invention includes a step of setting a first measurement condition for transmitting and receiving a guide wave to and from a tube member of a heat exchanger, and the first measurement condition. The step of acquiring and storing the first measurement data by performing ultrasonic flaw detection by transmitting and receiving the guide wave, and the step of changing to the measurement condition different from the first measurement condition and setting the second measurement condition And in the second measurement condition, performing ultrasonic flaw detection by transmitting and receiving a guide wave to acquire and store second measurement data, the first measurement data, and the second measurement data, On the other hand, one or more of addition, subtraction, and multiplication are processed, and a change in signal strength after the signal processing is captured to specify a noise signal or a defect signal.

  For this reason, it is possible to reduce a possibility that a noise signal caused by an electric circuit of the probe unit, an ultrasonic probe, or the like is measured and the noise signal caused by the defect is mistaken as a defect signal. As a result, in the inspection of a long structure, it is possible to grasp defects such as scratches, cracks, and thinning even if ultrasonic inspection using a guide wave is performed.

  In order to achieve the above object, the ultrasonic flaw detection inspection method of the present invention includes a step of setting a first measurement condition for transmitting and receiving a guide wave to and from a tube member of a heat exchanger, and the first measurement condition. The step of acquiring and storing the first measurement data by performing ultrasonic flaw detection by transmitting and receiving a guide wave, variably changing the length of insertion of the probe portion into the tube member, and performing the second measurement A step of setting a condition, a step of acquiring and storing second measurement data by performing ultrasonic flaw detection by transmitting and receiving a guide wave in the second measurement condition, the first measurement data, and the first measurement data Signal processing for comparing the two measurement data with each other, capturing a position change of the waveform signal after the signal processing, and specifying a noise signal or a defect signal.

  For this reason, it is possible to reduce a possibility that a noise signal caused by an electric circuit of the probe unit, an ultrasonic probe, or the like is measured and the noise signal caused by the defect is mistaken as a defect signal. As a result, in the inspection of a long structure, it is possible to grasp defects such as scratches, cracks, and thinning even if ultrasonic inspection using a guide wave is performed.

  According to the present invention, it is possible to shorten the work time and reduce the possibility of misidentifying a noise signal as a defect signal caused by a defect.

FIG. 1 is a configuration diagram of a general nuclear power plant. FIG. 2 is a configuration diagram of a water chamber of the steam generator in the nuclear power plant shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. FIG. 4 is a schematic diagram showing the ultrasonic flaw detection apparatus according to the first embodiment. FIG. 5 is a schematic diagram showing the control device. FIG. 6 is a flowchart showing the inspection procedure of the ultrasonic flaw detection apparatus according to the present embodiment. FIG. 7 is a schematic diagram illustrating an ultrasonic flaw detection apparatus according to the second embodiment. FIG. 8 is a schematic view showing an ultrasonic flaw detection apparatus according to the third embodiment. FIG. 9 is a schematic diagram showing an ultrasonic flaw detection apparatus according to the fourth embodiment. FIG. 10 is a schematic diagram showing an ultrasonic flaw detection apparatus according to the fifth embodiment. FIG. 11 is a schematic diagram showing an ultrasonic flaw detection apparatus according to the sixth embodiment.

  DESCRIPTION OF EMBODIMENTS Embodiments (embodiments) for carrying out the present invention will be described in detail with reference to the drawings. The present invention is not limited by the contents described in the following embodiments. The constituent elements described below include those that can be easily assumed by those skilled in the art and those that are substantially the same. Furthermore, the constituent elements described below can be appropriately combined.

(Embodiment 1)
The first embodiment will be described with reference to the drawings. FIG. 1 shows a typical nuclear power plant. FIG. 2 is a configuration diagram of a water chamber of the steam generator in the nuclear power plant shown in FIG. FIG. 3 is a cross-sectional view taken along the line AA of FIG. The nuclear power plant 100 includes, for example, a pressurized water reactor (PWR: Pressurized Water Reactor). In this nuclear power plant 100, a reactor vessel 110 as a structure, a pressurizer 120, a steam generator 130, and a pump 140 are sequentially connected by a primary coolant pipe 150 to constitute a circulation path of the primary coolant. . Further, a secondary coolant circulation path is formed between the steam generator 130 and the turbine (not shown).

  In this nuclear power plant 100, the primary coolant is heated in the reactor vessel 110 to become high temperature and high pressure, and is pressurized by the pressurizer 120 to maintain the pressure constant, while the steam is passed through the primary coolant pipe 150. It is supplied to the generator 130. In the steam generator 130, the primary coolant flows into the inlet side water chamber 131, and is supplied from the inlet side water chamber 131 to the plurality of heat transfer tubes 132 in a U shape. And heat exchange with a primary coolant and a secondary coolant is performed in the heat exchanger tube 132, and a secondary coolant evaporates and becomes steam. That is, the steam generator 130 is a heat exchanger. The secondary coolant that has become steam by heat exchange is supplied to the turbine. The turbine is driven by the evaporation of the secondary coolant. Then, the power of the turbine is transmitted to a generator (not shown) to generate electricity. The steam used for driving the turbine is condensed into water and supplied to the steam generator 130. On the other hand, the primary coolant after heat exchange is collected on the pump 140 side via the primary coolant pipe 150.

  As shown in FIGS. 2 and 3, the steam generator 130 is provided with an inlet nozzle 135 in an inlet-side water chamber 131. The inlet nozzle 135 is connected to the inlet side primary coolant pipe 150 by welding. In addition, the steam generator 130 is provided with an outlet nozzle 136 in the outlet-side water chamber 133. The outlet nozzle stand 136 is connected to the outlet side primary coolant pipe 150 by welding. The inlet side water chamber 131 and the outlet side water chamber 133 are partitioned through a partition plate 134 while a tube plate 137 is installed on the ceiling. The tube plate 137 supports the lower end portion of the heat transfer tube 132 and partitions the upper portion of the steam generator 130 and the water chambers 131 and 133. In addition, the inlet side water chamber 131 and the outlet side water chamber 133 are provided with manholes 138 for workers to enter and exit the water chambers 131 and 133. In addition, the inlet side water chamber 131 and the outlet side water chamber 133 are formed in 1/4 spherical shape. In the nuclear power plant 100, there are a plurality of heat transfer tubes 132 of the steam generator 130, which is a heat exchanger, and it is desired to shorten the work time for the inspection of the heat transfer tubes 132. In addition, since the state of the heat transfer tube 132 is directly connected safely, if the noise signal is mistaken as a defect signal due to a defect, it is not preferable because the inspection period until re-inspection and safety is confirmed is extended. In the fast reactor type reactor that cools the reactor core with sodium or the like, a primary sodium system and a secondary sodium system are provided in order to reduce the influence of the sodium-water reaction. It has an intermediate heat exchanger that performs the exchange. The heat of secondary sodium is transferred to water in a steam generator to obtain steam. The heat exchanger inspected by the ultrasonic flaw detection apparatus of this embodiment includes an intermediate heat exchanger of a fast reactor type reactor and a steam generator as inspection targets.

  Hereinafter, the ultrasonic flaw detection inspection apparatus 1 of the present embodiment will be described. FIG. 4 is a schematic diagram showing an ultrasonic flaw detection apparatus according to the present embodiment. FIG. 5 is a schematic diagram showing the control device.

  As shown in FIG. 4, the ultrasonic flaw detection inspection apparatus 1 is an inspection apparatus that inspects a heat transfer tube 132 that is a tube member of a heat exchanger inside the water chambers 131 and 133 of the steam generator 130 described above. The heat transfer tube 132 has a pair of tube ends 132a, 132b. As shown in FIG. 1, the heat transfer tube 132 is actually U-shaped, but in order to facilitate understanding of the distance between the pair of ends 132a and 132b of the tube, the heat transfer tube 132 is schematically linear in FIG. It is said. The heat transfer tube 132 will be described on the assumption that there is a scratch Q.

  4 operates as an ultrasonic transducer and includes a probe unit 10, an ultrasonic transmission / reception unit 20, a support unit 30, a probe insertion length varying unit 31, and a control unit 80. ing.

  The probe unit 10 is a deep touch element that is partially inserted into the heat transfer tube 132 and propagates a guide wave to the heat transfer tube 132. The probe unit 10 includes a guide wave guide unit 11 and a guide wave transmission unit 12. The guide wave guide unit 11 has a rod shape for guiding a guide wave from an ultrasonic transmission / reception unit 20 described later to the heat transfer tube 132. The guide wave transmission unit 12 is attached in the vicinity of the tip of the guide wave guide unit 11, is inserted into the heat transfer tube 132, and is in contact with the inner wall of the heat transfer tube 132. The guide wave transmission unit 12 transmits a guide wave from the guide wave guide unit 11 to the heat transfer tube 132.

  Here, the guide wave is a general term for an ultrasonic wave propagation form transmitted in the longitudinal direction of a tube member or the like. The guide wave can propagate for a long distance because the ultrasonic energy hardly leaks out of the medium. For this reason, in the ultrasonic flaw detection inspection apparatus 1 of the present embodiment, since the tube member such as the heat exchanger has a relatively long distance, the guide wave is used for the nondestructive inspection of the tube member such as the heat exchanger.

  Assume that the pipe member has defects such as scratches, cracks and thinning. As described above, the guide wave propagates in the longitudinal direction of the tube member. When the guide wave encounters defects such as scratches, cracks, and thinning during the propagation of the pipe member, the propagation path becomes discontinuous and the guide wave is reflected. For this reason, if the position which a guide wave reflects can be specified, the position which has defects, such as a crack, a crack, and a thinning, in a pipe member can be specified.

  The ultrasonic transmission / reception unit 20 is connected to the guide wave guide unit 11 and includes a transmission / reception unit 21 and an electrical conversion unit 22. In the first embodiment, the transmission / reception unit 21 is formed of a magnetostrictive material. For example, as the magnetostrictive material, nickel, nickel alloy, silicon steel, ferrite material, or the like can be used. Moreover, the electrical conversion part 22 has a coil formed of a conductor such as copper. When the coil of the electrical conversion unit 22 is excited, the magnetostrictive material of the transmission / reception unit 21 vibrates due to the magnetostriction effect, and an ultrasonic wave is transmitted as a transmission wave. As the ultrasonic wave, a torsion wave signal is more preferable. When the reflected wave of the guide wave is transmitted from the probe unit 10 to the transmitting / receiving unit 21, the magnetostrictive material of the transmitting / receiving unit 21 converts the vibration of the reflected wave into a magnetic field change due to the inverse magnetostriction effect. The converted magnetic field change is converted into an electric signal by the coil of the electric converter 22. In the ultrasonic transmission / reception unit 20, the transmission / reception unit 21 may be configured by a piezoelectric material, for example, lead zirconate titanate (PZT), and the electrical conversion unit 22 may be configured by conductive electrodes that sandwich the piezoelectric material. In addition, the transmission / reception part 21 may be divided into ultrasonic transmission and ultrasonic reception, and may be configured as a separate body.

  Here, in FIG. 4, in order to explain the operation of the ultrasonic flaw detection inspection apparatus 1, the first measurement condition for causing the probe unit 10 to be inserted into the heat transfer tube 132 by the insertion length T <b> 1 and propagating the guide wave to the heat transfer tube 132 is shown. The state and the state of the second measurement condition in which the probe unit 10 is inserted into the heat transfer tube 132 by the insertion length T2 and the guide wave is propagated to the heat transfer tube 132 are described with the position of the heat transfer tube 132 aligned vertically. is doing. A measurement axis P0 shown in FIG. 4 is position coordinates corresponding to the position of the heat transfer tube 132 in the state of the first measurement condition. In FIG. 4, the waveform signal W1, the waveform signal W2, and the waveform signal W3 are measured on the measurement axis P0 by the ultrasonic transmission / reception unit 20. 4 is a position coordinate corresponding to the position of the heat transfer tube 132 in the state of the second measurement condition. In FIG. 4, the waveform signal W11, the waveform signal W12, and the waveform signal W13 are measured on the measurement axis P1 by the ultrasonic transmission / reception unit 20. In FIG. 4, the measurement axis P <b> 2 is position coordinates corresponding to the position of the heat transfer tube 132 in a state after signal processing of measurement data described later. In FIG. 4, a waveform signal W21, a waveform signal W22, a waveform signal W23, a waveform signal W24, a waveform signal W25, and a waveform signal W26 synthesized by signal processing of measurement data are transmitted to the measurement axis P2. It is described in alignment with the position of the heat tube 132.

  The support means 30 supports the probe unit 10 at a predetermined position. The support means 30 is preferably made of a vibration-proof material such as resin, for example, because noise can be reduced. The probe insertion length variable means 31 is connected to the support means 30 and has a mechanism capable of changing the insertion length of the probe unit 10, for example, an arm mechanism driven by a servo motor.

  The control device 80 is a device that controls the probe unit 10 and the ultrasonic transmission / reception unit 20. The control device 80 will be described with reference to FIG. The control device 80 shown in FIG. 5 includes an input processing circuit 81, an input port 82, a processing unit 90, a storage unit 94, an output port 83, an output processing circuit 84, a display device 85, and a keyboard if necessary. And the like. The processing unit 90 includes, for example, a CPU (Central Processing Unit) 91, a RAM (Random Access Memory) 92, and a ROM (Read Only Memory) 93.

  The processing unit 90, the storage unit 94, and the input port 82 and the output port 83 are connected via a bus 87, a bus 88, and a bus 89. By the bus 87, the bus 88, and the bus 89, the CPU 91 of the processing unit 90 is configured to exchange control data with the storage unit 94, the input port 82, and the output port 83 and to issue commands to one side. The

  An input processing circuit 81 is connected to the input port 82. The input processing circuit 81 is connected with measurement data is from the electrical converter 22. The measurement data is is converted into a signal that can be used by the processing unit 90 by a noise filter, an A / D converter, or the like provided in the input processing circuit 81, and then sent to the processing unit 90 via the input port 82. Thereby, the processing unit 90 can acquire necessary information.

  An output processing circuit 84 is connected to the output port 83. The output processing circuit 84 is connected to a display device 85 and an external output terminal. The output processing circuit 84 includes a display device control circuit, a control signal circuit such as the probe insertion length varying means 31, a signal amplification circuit, and the like. The output processing circuit 84 outputs the guide wave signal data calculated by the processing unit 90 as a display signal to be displayed on the display device 85 or outputs it as an instruction signal id transmitted to the probe insertion length varying means 31. . As the display device 85, for example, a liquid crystal display panel, a CRT (Cathode Ray Tube), or the like can be used.

  The storage unit 94 stores a computer program including an operation procedure of the ultrasonic flaw detection inspection apparatus 1. Here, the storage unit 94 can be configured by a volatile memory such as a RAM, a nonvolatile memory such as a flash memory, a hard disk drive, or a combination thereof.

  The computer program may execute an operation procedure of the ultrasonic flaw detection inspection apparatus 1 in combination with a computer program already recorded in the processing unit 90. Moreover, this control apparatus 80 may perform the operation | movement procedure of the ultrasonic flaw detection inspection apparatus 1 using a dedicated hardware instead of a computer program.

  The operation procedure of the ultrasonic flaw detection inspection apparatus 1 can also be realized by executing a program prepared in advance on a computer system such as a personal computer, a workstation, or a plant control computer. The program is recorded on a computer-readable recording medium such as a recording device such as a hard disk, a flexible disk (FD), a ROM, a CD-ROM, an MO, a DVD, or a flash memory, and is read from the recording medium by the computer. Can also be implemented. Here, the “computer system” includes an OS and hardware such as peripheral devices.

  In addition, the “computer-readable recording medium” dynamically stores the program for a short time, such as a communication line when the program is transmitted via a network such as the Internet or a communication line network such as a telephone line. What is held, and what holds a program for a certain period of time, such as volatile memory inside a computer system serving as a server or client in that case, are included. Further, the program may be for realizing a part of the above-described functions, and may be capable of realizing the above-described functions in combination with a program already recorded in the computer system. .

  Next, the procedure of the operation of the ultrasonic flaw detection inspection apparatus 1 will be described with reference to FIGS. 4, 5, and 6. FIG. 6 is a flowchart showing the inspection procedure of the ultrasonic flaw detection apparatus according to the present embodiment. The procedure of the operation of the ultrasonic flaw detection inspection apparatus 1 will be described along the flowchart shown in FIG. The control device 80 of the ultrasonic flaw detection inspection apparatus 1 sets the first measurement condition (step S11). In the present embodiment, the control device 80 controls the probe insertion length varying means 31 so that the probe unit 10 is inserted into the heat transfer tube 132 with the insertion length T1 (first measurement condition).

  Next, the control device 80 controls the ultrasonic transmission / reception unit 20, performs ultrasonic flaw detection by transmitting / receiving a guide wave, and acquires first measurement data (step S12). The first measurement data is stored in the RAM 92 or the storage unit 94.

  The control device 80 performs a change setting of the measurement condition (step S21). In the present embodiment, in FIG. 4, the control device 80 controls the probe insertion length varying means 31 so that the probe unit 10 is inserted into the heat transfer tube 132 with the insertion length T2 (second measurement condition). . In the present embodiment, the insertion length T2> the insertion length T1. The insertion length T1 and the insertion length T2 may be different.

  Next, the control device 80 controls the ultrasonic transmission / reception unit 20, performs ultrasonic flaw detection by transmitting / receiving a guide wave, and acquires measurement data (second measurement data) under the changed conditions (step S22). ). The second measurement data is stored in the RAM 92 or the storage unit 94.

  Next, the control device 80 determines whether or not predetermined measurement data has been terminated (step S23). In the present embodiment, since the measurement data is twice, it is determined that the measurement end determination is possible (step S23, Yes). In the present embodiment, the measurement data is twice, but may be three or more times. In this case, the measurement end determination is negative (step S23, No), and the procedure from step S21 is repeated.

  Next, the control device 80 performs signal processing of measurement data (step S31). Specifically, the CPU 91 reads out the first measurement data and the second measurement data stored in the RAM 92 or the storage unit 94 to the work area of the RAM 92, and obtains the first measurement data and the second measurement data. to add. In the measurement axis P2 in FIG. 4, the waveform signals W21, W22, W23, W24, and the position coordinates corresponding to the position of the heat transfer tube 132 in the state after adding the first measurement data and the second measurement data, W25 and W26 exist. The CPU 91 recognizes the positions and signal strengths of the waveform signals W21, W22, W23, W24, W25, and W26 and stores them in the RAM 92 or the storage unit 94.

  Next, the control device 80 specifies a noise signal or a defect signal (step S32). In the measurement axis P2 in FIG. 4, it can be seen that the signal intensity of the waveform signal W23 is higher than that of the waveform signals W2 and W12. Similarly, in the measurement axis P2 in FIG. 4, it can be seen that the signal intensity of the waveform signal W26 is higher than that of the waveform signals W4 and W14. On the other hand, the waveform signal W21, the waveform signal W22, the waveform signal W24, and the waveform signal W25 have the same signal strength as the waveform signal W1, the waveform signal W3, the waveform signal W11, and the waveform signal W13.

  In the present embodiment, the control device 80 specifies the waveform signal W21, the waveform signal W22, the waveform signal W24, and the waveform signal W25 as noise signals. Specificity is determined by the fact that the waveform signal does not increase on the measurement axis P2 as the insertion length T1 at which the probe unit 10 is inserted into the heat transfer tube 132 changes to the insertion length T2. When the measurement axis P0 shown in FIG. 4 is compared with the measurement axis P1, the waveform signal W1 on the measurement axis P0 shown in FIG. 4 moves to the waveform signal W11 on the measurement axis P1 as the probe unit 10 moves. It is considered a thing. Further, it is considered that the waveform signal W3 on the measurement axis P0 shown in FIG. 4 has moved to the waveform signal W13 on the measurement axis P1 as the probe unit 10 moves. The movement of the signal waveform with the movement of the probe unit 10 is considered not a signal due to a defect but a noise signal. Since the signal waveform moves with the movement of the probe unit 10, even if the first measurement data and the second measurement data are added, for example, the positions of W1 and W11 do not overlap, and the signal intensity Will not increase.

  In the present embodiment, the control device 80 specifies the waveform signal W23 caused by the scratch Q as a defect signal. Specificity is determined by the waveform signal increasing on the measurement axis P2 as the insertion length T1 at which the probe unit 10 is inserted into the heat transfer tube 132 changes to the insertion length T2. When the measurement axis P0 shown in FIG. 4 is compared with the measurement axis P1, the waveform signal W2 on the measurement axis P0 becomes the waveform signal W12 on the measurement axis P1 as the probe unit 10 moves. The relative positions of the waveform signal W2 and the waveform signal 12 with respect to the heat transfer tube 132 are not changed. When the first measurement data and the second measurement data are added, the signal intensities overlap and the signal intensity increases. Thereby, the position of the damage | wound Q in the heat exchanger tube 132 can be pinpointed from the position of waveform signal W2, W12, or W23.

  The signal intensity of the waveform signal W26 also increases. This captures the reflected signal waveform reflected by the end 132b of the heat transfer tube 132. Regardless of the movement of the probe unit 10, the reflected signal waveform reflected at the end 132b of the heat transfer tube 132 is captured, so even if the signal intensity increases at the end 132b of the heat transfer tube 132, it is not handled as a defect signal. It is said. Although not shown in FIG. 4, a similar reflected signal waveform may be measured at the end 132 a of the heat transfer tube 132, so even if the signal intensity increases at the end 132 a of the heat transfer tube 132, the defect signal is Do not handle. In many cases, the defect signal is not measured, and the noise signal is not measured. In step S32, it is sufficient to specify when there is a noise signal or a defect signal.

  The signal processing of the measurement data in step S31 is not limited to the addition process. For example, the absolute value of the first measurement data and the absolute value of the second measurement data may be added or multiplied. Or, when the envelope of the first measurement data and the envelope of the second measurement data are calculated in advance by the CPU 91, and the envelopes are added or multiplied to increase the strength compared to the original envelope The defect signal may be specified. Alternatively, as another modified example, the first measurement data and the second measurement data may be subtracted. When the difference between the first measurement data and the second measurement data is taken, the defect signal whose position of the waveform signal does not change regardless of the movement of the probe unit 10 has no signal strength after the subtraction process or the signal strength is reduced. It is specified by the fact that the ratio is larger than other signals.

  In the ultrasonic flaw detection inspection apparatus 1 according to the first embodiment, a probe unit that is inserted into a tube member of a heat exchanger and propagates a guide wave to the tube member, and an ultrasonic wave that becomes the guide wave through the probe unit. An ultrasonic transmission / reception unit capable of transmitting and receiving a guide wave propagated to the tube member, and a control device capable of controlling the probe unit and the ultrasonic transmission / reception unit, the control device, A noise signal or a defect signal of the pipe member is specified by comparing a plurality of pieces of measurement data in the ultrasonic transmission / reception unit under different measurement conditions.

  For this reason, it is possible to reduce a possibility that a noise signal caused by an electric circuit of the probe unit, an ultrasonic probe, or the like is measured and the noise signal caused by the defect is mistaken as a defect signal. As a result, in the inspection of a long structure, it is possible to grasp defects such as scratches, cracks, and thinning even if ultrasonic inspection using a guide wave is performed.

  In the ultrasonic flaw detection inspection apparatus 1 according to the first embodiment, the ultrasonic inspection apparatus 1 further includes a length adjusting unit that changes a length in which the probe is inserted into the tube member, and the control device controls the length adjusting unit to control the length adjusting unit. Set different measurement conditions. This eliminates the need for the ultrasonic probe to be transported over the entire length of the pipe, thereby reducing the work time.

  In the ultrasonic flaw detection inspection apparatus 1 according to the first embodiment, the control device determines that a waveform signal in which a reception signal varies among a plurality of measurement data in the ultrasonic transmission / reception unit under different measurement conditions is a noise signal. It is preferable to do. In the first embodiment, the positions of the waveform signals W1 and W3 are changed to the positions of the waveform signals W11 and W13. This can reduce the possibility of misidentifying a noise signal as a defect signal due to a defect.

  In the ultrasonic flaw detection inspection apparatus 1 according to the first embodiment, a plurality of measurement data are subjected to the signal processing of addition, subtraction, or multiplication, and a change in signal intensity after the signal processing is captured. Preferably specified. This can reduce the possibility of misidentifying a noise signal as a defect signal due to a defect.

  In the ultrasonic flaw detection method according to the first embodiment, a step of setting a first measurement condition for transmitting / receiving a guide wave to / from a tube member of a heat exchanger and a transmission / reception of a guide wave in the first measurement condition are performed. In the step of performing ultrasonic flaw detection and acquiring and storing first measurement data, the step of changing to a measurement condition different from the first measurement condition and setting the second measurement condition, and the second measurement condition , Performing ultrasonic flaw detection by transmitting and receiving a guide wave to acquire and store second measurement data, and adding, subtracting, and multiplying the first measurement data and the second measurement data Any one or more of the above signal processing is performed, a change in signal intensity after the signal processing is captured, and a noise signal or a defect signal is specified.

  For this reason, it is possible to reduce a possibility that a noise signal caused by an electric circuit of the probe unit, an ultrasonic probe, or the like is measured and the noise signal caused by the defect is mistaken as a defect signal. As a result, in the inspection of a long structure, it is possible to grasp defects such as scratches, cracks, and thinning even if ultrasonic inspection using a guide wave is performed. Moreover, the noise signal or defect signal of the specified pipe member is obtained by performing the signal processing of any two or more of addition, subtraction, and multiplication for the first measurement data and the second measurement data. The degree of trust can be increased. For example, the pipe member specified as signal processing of either subtraction or multiplication, and the noise signal or defect signal of the pipe member specified by adding to the first measurement data and the second measurement data If the noise signal or the defect signal matches, the accuracy of the identified noise signal or defect signal can be increased.

(Embodiment 2)
FIG. 7 is a schematic diagram of the ultrasonic flaw detection apparatus 2 according to the second embodiment. The ultrasonic flaw detection inspection apparatus 2 according to the present embodiment is characterized in that it acquires a plurality of measurement data in an ultrasonic transmission / reception unit while varying the length inserted into a heat transfer tube that is a tube member. In the following description, the same components as those described in the first embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

  Here, in FIG. 7, for the explanation of the operation of the ultrasonic flaw detection inspection apparatus 2, the first measurement condition for causing the probe unit 10 to be inserted into the heat transfer tube 132 by the insertion length T1 and propagating the guide wave to the heat transfer tube 132 is shown. The state and the state of the second measurement condition in which the probe portion 10 is inserted into the heat transfer tube 132 by the insertion length T3 and the guide wave is propagated to the heat transfer tube 132 are described with the position of the heat transfer tube 132 aligned vertically. is doing. A measurement axis P0 shown in FIG. 7 is a position coordinate corresponding to the position of the heat transfer tube 132 in the state of the first measurement condition. In FIG. 7, the waveform signal W1, the waveform signal W2, and the waveform signal W3 are measured on the measurement axis P0 by the ultrasonic transmission / reception unit 20. 7 is a position coordinate corresponding to the position of the heat transfer tube 132 in the state of the second measurement condition. In FIG. 7, the waveform signal W11, the waveform signal W12, and the waveform signal W13 are measured on the measurement axis P1 by the ultrasonic transmission / reception unit 20.

  With reference to FIG.6 and FIG.7, operation | movement of the ultrasonic flaw detection inspection apparatus 2 is demonstrated. The control device 80 of the ultrasonic flaw detection inspection apparatus 2 sets the first measurement condition (step S11). In the present embodiment, the control device 80 controls the probe insertion length varying means 31 so that the probe unit 10 is inserted into the heat transfer tube 132 with the insertion length T1 (first measurement condition). Next, the control device 80 controls the ultrasonic transmission / reception unit 20, performs ultrasonic flaw detection by transmitting / receiving a guide wave, and acquires first measurement data (step S12). The first measurement data is stored in the RAM 92 or the storage unit 94.

  The control device 80 performs a change setting of the measurement condition (step S21). In the present embodiment, the control device 80 controls the probe insertion length varying means 31, and the probe unit 10 is moved along the arrow V1 into the heat transfer tube 132 so that the insertion length T3 is gradually increased. Operating state (second measurement condition).

  Next, the control device 80 controls the ultrasonic transmission / reception unit 20 and transmits / receives a guide wave to perform ultrasonic flaw detection and acquire measurement data (second measurement data) (step S22). The second measurement data is stored in the RAM 92 or the storage unit 94.

  The control device 80 determines whether or not predetermined measurement data has been completed (step S23). In this embodiment, since measurement data is measured continuously, it becomes no (step S23, No), and the procedure from step S21 is repeated. In this embodiment, when the insertion length T3 becomes a predetermined length, the measurement end determination is possible (step S23, Yes).

  Next, the control device 80 performs signal processing of measurement data (step S31). Specifically, since the second measurement data stored in the RAM 92 or the storage unit 94 by the CPU 91 is continuous data, the data is read and superimposed on the measurement axis P1. Waveform signals W11, W12, W13, and W14 exist on the measurement axis P1 in FIG. Next, the control device 80 specifies a noise signal or a defect signal (step S32). The waveform signal W11 on the measurement axis P1 in FIG. 7 moves on the measurement axis P1 in the direction of the arrow V2 as the probe unit 10 moves along the arrow V1 in the heat transfer tube 132. Similarly, the waveform signal W13 on the measurement axis P1 moves on the measurement axis P1 in the direction of the arrow V2 as the probe unit 10 moves in the heat transfer tube 132 along the arrow V1. The waveform signals W12 and W14 on the measurement axis P1 do not change their positions on the measurement axis P1 even if the probe unit 10 moves along the arrow V1 into the heat transfer tube 132.

  In the present embodiment, the control device 80 specifies the waveform signal W11 and the waveform signal W13 as noise signals. Specifically, as the probe unit 10 moves in the heat transfer tube 132 along the arrow V1, a signal waveform that moves on the measurement axis P1 in the direction of the arrow V2 is determined as a noise signal. This is because the waveform signal W11 and the waveform signal W13 are considered to have moved with the movement of the probe unit 10 from the waveform signals W1 and W3 on the measurement axis P0 shown in FIG.

The control device 80 specifies the waveform signal W12 as a defect signal due to the scratch Q. Specifically, even if the probe unit 10 moves in the heat transfer tube 132 along the arrow V1, a signal waveform whose position does not change on the measurement axis P1 is determined as a defect signal. This is because the waveform signal W12 does not move with the movement of the probe unit 10 from the waveform signal W2 on the measurement axis P0 shown in FIG. Thereby, the position of the wound Q in the heat transfer tube 132 can be specified from the position of the waveform signal W2 or W12.
Note that the waveform signal W14 does not move with the movement of the probe unit 10 from the waveform signal W4 on the measurement axis P0 shown in FIG. This captures the reflected signal waveform reflected by the end 132b of the heat transfer tube 132 as described above. For this reason, even if the waveform signal does not move at the end 132b of the heat transfer tube 132, it is not handled as a defect signal.

  In the ultrasonic flaw detection apparatus 2 according to the second embodiment, as the different measurement conditions, a plurality of measurement data in the ultrasonic transmission / reception unit is acquired while changing the length inserted into the heat transfer tube. By capturing the movement of the waveform signal, it is possible to easily identify whether it is a noise signal or a defect signal.

  In the ultrasonic flaw detection apparatus 2 according to the second embodiment, the control device determines that a waveform signal in which a reception signal is fluctuated is a noise signal among a plurality of measurement data in the ultrasonic transmission / reception unit under different measurement conditions. It is preferable to do. In the second embodiment, the positions of the waveform signals W1 and W3 are moved along the measurement axis P1 in the direction of the arrow V2 as the probe unit 10 moves along the arrow V1 into the heat transfer tube 132, and the waveform signals W11 and W13. Is in position. This can reduce the possibility of misidentifying a noise signal as a defect signal due to a defect.

  In the ultrasonic flaw detection method according to the second embodiment, a step of setting a first measurement condition for transmitting and receiving a guide wave to and from a tube member of a heat exchanger, and transmission and reception of a guide wave in the first measurement condition Performing ultrasonic flaw detection and acquiring and storing first measurement data; variably changing a length of insertion of the probe portion into the tube member; and setting a second measurement condition; Under the second measurement condition, the step of acquiring and storing the second measurement data by performing ultrasonic flaw detection by transmitting and receiving a guide wave is compared with the first measurement data and the second measurement data. Signal processing is performed, the position change of the waveform signal after the signal processing is captured, and a noise signal or a defect signal is specified.

  For this reason, it is possible to reduce a possibility that a noise signal caused by an electric circuit of the probe unit, an ultrasonic probe, or the like is measured and the noise signal caused by the defect is mistaken as a defect signal. As a result, in the inspection of a long structure, it is possible to grasp defects such as scratches, cracks, and thinning even if ultrasonic inspection using a guide wave is performed.

(Embodiment 3)
FIG. 8 is a schematic diagram of the ultrasonic flaw detection apparatus 3 according to the third embodiment. The ultrasonic flaw detection inspection apparatus 3 according to the present embodiment is characterized in that the length inserted into the heat transfer tube is not changed, and a plurality of measurement data is acquired by changing the input frequency in the ultrasonic transmission / reception unit. . In the following description, the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  Here, in FIG. 8, for explaining the operation of the ultrasonic flaw detection inspection apparatus 3, the probe unit 10 is inserted into the heat transfer tube 132 and a guide wave is propagated to the heat transfer tube 132 at the first input frequency (frequency 1). The probe unit 10 is inserted into the heat transfer tube 132 with the measurement data of the first measurement condition (measurement condition 1) and the second input frequency (frequency 2), and the heat transfer tube 132 with the second input frequency (frequency 2). The measurement data of the second measurement condition (measurement condition 2) for propagating the guide wave is described with the position of the heat transfer tube 132 aligned vertically in the figure. A measurement axis U0 shown in FIG. 8 is position coordinates corresponding to the position of the heat transfer tube 132 in the state of the first measurement condition. In FIG. 8, waveform signals W31, W32, W33, W34, W35, and W36 are measured on the measurement axis U0 by the ultrasonic transmission / reception unit 20. Moreover, the measurement axis U1 shown in FIG. 8 is a position coordinate corresponding to the position of the heat transfer tube 132 in the state of the second measurement condition. In FIG. 8, waveform signals W41, W42, W43, W44, W45, and W46 are measured on the measurement axis U1 by the ultrasonic transmitting / receiving unit 20. In FIG. 8, the measurement axis U2 is a position coordinate corresponding to the position of the heat transfer tube 132 in a state after signal processing of measurement data described later. In FIG. 8, waveform signals W51, W521, w522, W531, W532, W541, W542, W55, and W56 are aligned with the position of the heat transfer tube 132 on the measurement axis U2 as a synthesized waveform synthesized by signal processing of measurement data. It is described.

  The operation of the ultrasonic flaw detection inspection apparatus 3 will be described with reference to FIGS. The control device 80 of the ultrasonic flaw detection inspection apparatus 3 sets the first measurement condition (step S11). In the present embodiment, the control device 80 controls the ultrasonic transmission / reception unit 20 and sets the input frequency of the guide wave transmitted to the probe unit 10 and the detection frequency corresponding to the input frequency (first measurement condition). . For example, the input frequency (detection frequency) is set to 200 kHz. Next, the control device 80 controls the ultrasonic transmission / reception unit 20, performs ultrasonic flaw detection by transmitting / receiving a guide wave, and acquires first measurement data (step S12). The first measurement data is stored in the RAM 92 or the storage unit 94.

  The control device 80 performs a change setting of the measurement condition (step S21). In the present embodiment, the control device 80 controls the ultrasonic transmission / reception unit 20 to change the input frequency of the guide wave transmitted to the probe unit 10 and the detection frequency corresponding to the input frequency (second measurement condition). . For example, the input frequency (detection frequency) is set to 220 kHz.

  Next, the control device 80 controls the ultrasonic transmission / reception unit 20 and transmits / receives a guide wave to perform ultrasonic flaw detection and acquire measurement data (second measurement data) (step S22). The second measurement data is stored in the RAM 92 or the storage unit 94.

  The control device 80 determines whether or not predetermined measurement data has been completed (step S23). In the present embodiment, since the measurement data is twice, it is determined that the measurement end determination is possible (step S23, Yes). In the present embodiment, the measurement data is twice, but may be three or more times. In this case, the measurement end determination is no (No in step S23), and the process is repeated from step S21.

  Next, the control device 80 performs signal processing of measurement data (step S31). Specifically, the CPU 91 reads out the first measurement data and the second measurement data stored in the RAM 92 or the storage unit 94 to the work area of the RAM 92, and obtains the first measurement data and the second measurement data. to add. In the measurement axis U2 in FIG. 8, waveform signals W51, W521, waveform coordinates W51, W521, the position coordinates corresponding to the position of the heat transfer tube 132 in the state after the addition processing of the first measurement data and the second measurement data (synthetic waveform), There are W522, W531, W532, W541, W542, W55, and W56. The signal processing of the measurement data in step S31 is not limited to the addition process. For example, the absolute value of the first measurement data and the absolute value of the second measurement data may be added or multiplied. Or, when the envelope of the first measurement data and the envelope of the second measurement data are calculated in advance by the CPU 91, and the envelopes are added or multiplied to increase the strength compared to the original envelope The defect signal may be specified. Alternatively, as another modified example, the first measurement data and the second measurement data may be subtracted.

  Next, the control device 80 specifies a noise signal or a defect signal (step S32). In the measurement axis U2 in FIG. 8, it can be seen that the signal intensity of the waveform signal W55 is higher than that of the waveform signal W35 and the waveform signal W45. Similarly, on the measurement axis U2 in FIG. 8, it can be seen that the signal strength of the waveform signals W51, W55, and W56 is higher than the waveform signals W521, W522, W531, W532, W541, and W542. On the other hand, W521, W522, W531, W532, W541, and W542 have the same signal strength as the waveform signal W32, waveform signal W33, waveform signal W34, and waveform signals W42, 43, and W44.

  In the present embodiment, the control device 80 specifies the waveform signals W521 and W522, the waveform signals W531 and W532, the waveform signal W541, and the waveform signal W542 as noise signals. The identification is determined by the fact that the waveform signal does not increase on the measurement axis U2 with the change of the input frequency (detection frequency) in the ultrasonic transmission / reception unit 20. The noise signal derived from the ultrasonic transmission / reception unit 20 changes as the input frequency (detection frequency) changes. Even if the input frequency (detection frequency) changes, the defect signal and the noise signal are specified by utilizing the fact that the signal caused by the defect does not change. This utilizes the fact that the waveform and sound speed of a signal caused by a defect can be regarded as almost constant regardless of the input frequency (detection frequency).

  In the present embodiment, ultrasonic flaw detection using a guide wave in which an unnecessary waveform signal including a transmission wave generated in the vicinity of the probe unit 10 appears, such as the waveform signal W32, the waveform signal W33, the waveform signal W42, and the waveform signal W43. The noise signal can be specified.

  The control device 80 specifies the waveform signal W55 as a defect signal due to the scratch Q. The specific is determined by the waveform signal increasing on the measurement axis U2 with the change of the input frequency (detection frequency) in the ultrasonic transmission / reception unit 20. This is because the waveform signal W55 does not move as the input frequency (detection frequency) changes from the waveform signal W35 on the measurement axis U0 shown in FIG. Thereby, the position of the flaw Q in the heat transfer tube 132 can be specified from the position of the waveform signal W35, W45 or W55. Note that the waveform signal W51 and the waveform signal 56 do not move as the input frequency (detection frequency) changes from the waveform signal W31 and the waveform signal W36 on the measurement axis U0 shown in FIG. This captures the reflected signal waveform reflected by the ends 132a and 132b of the heat transfer tube 132 as described above. For this reason, even if the waveform signal does not move at the end portions 132a and 132b of the heat transfer tube 132, it is not handled as a defect signal.

  In the ultrasonic flaw detection inspection apparatus 3 of Embodiment 3, a plurality of measurement data is acquired by changing the input frequency in the ultrasonic transmission / reception unit 20 as different measurement conditions. Thereby, an unnecessary waveform signal including a transmission wave generated in the vicinity of the probe unit 10 can be reduced, and the defect signal can be easily seen.

  In the ultrasonic flaw detection apparatus 3 according to the third embodiment, the control device determines that a waveform signal in which a reception signal is fluctuated is a noise signal among a plurality of measurement data in the ultrasonic transmission / reception unit under different measurement conditions. It is preferable to do. In the third embodiment, the positions of the waveform signals W32, W33, and 34 are changed to the positions of the waveform signals W42, W43, and W44. This can reduce the possibility of misidentifying a noise signal as a defect signal due to a defect.

  In the ultrasonic flaw detection inspection apparatus 3 according to the third embodiment, a plurality of measurement data are subjected to one or more of the signal processing of addition, subtraction, and multiplication, a change in signal intensity after the signal processing is detected, and a noise signal or a defect is detected. Preferably the signal is specified. This can reduce the possibility of misidentifying a noise signal as a defect signal due to a defect. Moreover, the noise signal or defect signal of the specified pipe member is obtained by performing the signal processing of any two or more of addition, subtraction, and multiplication for the first measurement data and the second measurement data. The degree of trust can be increased. For example, the pipe member specified as signal processing of either subtraction or multiplication, and the noise signal or defect signal of the pipe member specified by adding to the first measurement data and the second measurement data If the noise signal or the defect signal matches, the accuracy of the identified noise signal or defect signal can be increased.

(Embodiment 4)
FIG. 9 is a schematic diagram of the ultrasonic flaw detection inspection apparatus 4 according to the fourth embodiment. The ultrasonic flaw detection inspection apparatus 4 according to the present embodiment has a plurality of probe parts inserted into a heat transfer tube, and acquires measurement data by inserting a plurality of different probe parts into one heat transfer tube. There is. In the following description, the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 9, the ultrasonic flaw detection inspection apparatus 4 has a probe unit 10, a probe unit 10A, a probe unit 10B, and a probe unit 10C. The probe unit 10A, the probe unit 10B, and the probe unit 10C have the same configuration as the probe unit 10. A plurality of heat transfer tubes 132 are provided and are regularly arranged. Therefore, the probe unit 10, the probe unit 10A, the probe unit 10B, and the probe unit 10C are regularly attached to the support means 30 so as to correspond to the arrangement of the heat transfer tubes 132.

  The control device 80 of the ultrasonic flaw detection inspection apparatus 4 sets the first measurement condition (step S11). In this embodiment, the control device 80 controls the probe insertion length varying means 31 so that the probe unit 10, the probe unit 10A, the probe unit 10B, and the probe unit 10C are inserted into the heat transfer tubes 132 (first Measurement conditions). Next, the control device 80 controls the ultrasonic transmission / reception unit 20, performs ultrasonic flaw detection by transmitting / receiving a guide wave, and acquires first measurement data (step S12). The first measurement data is stored in the RAM 92 or the storage unit 94.

  The control device 80 performs a change setting of the measurement condition (step S21). In the present embodiment, the control device 80 controls the probe insertion length varying means 31, and is different from the heat transfer tube 132 in which the probe unit 10, the probe unit 10A, the probe unit 10B, and the probe unit 10C each acquire the first measurement data. For example, the probe is moved along the arrow V3 in the heat transfer tube 132, and an operation state (second measurement condition) in which the probe unit 10, the probe unit 10A, the probe unit 10B, and the probe unit 10C are inserted is set. Next, the control device 80 controls the ultrasonic transmission / reception unit 20 and transmits / receives a guide wave to perform ultrasonic flaw detection and acquire measurement data (second measurement data) (step S22). The second measurement data is stored in the RAM 92 or the storage unit 94.

  Next, the control device 80 specifies a noise signal or a defect signal (step S32). The control device 80 controls the probe insertion length varying means 31 to insert at least any two of the plurality of different probe units 10, 10 </ b> A, 10 </ b> B, 10 </ b> C into one heat transfer tube 132. The control device 80 controls the ultrasonic transmission / reception unit 20 to acquire measurement data when any one of a plurality of different probe units 10, 10A, 10B, and 10C is inserted as different measurement conditions. Next, the signal processing of the measurement data in step S31 is performed as described above.

  The ultrasonic flaw detection inspection apparatus 4 according to the present embodiment can transmit a plurality of probe parts and ultrasonic waves to be the guide waves via the probe parts, and can receive a guide wave propagated to the tube member. An ultrasonic transmission / reception unit, and as the different measurement conditions, measurement data measured by different probe units among the plurality of probe units are compared with the tube member of the heat exchanger. Thereby, the noise signal resulting from the individual difference of a probe part can be reduced, and a defect signal can be made easy to see.

(Embodiment 5)
FIG. 10 is a schematic diagram of an ultrasonic flaw detection apparatus according to the fifth embodiment. The ultrasonic flaw detection inspection apparatus 5 according to the present embodiment has a plurality of probe parts to be inserted into the heat transfer tube, and acquires measurement data by inserting probe parts having different input frequencies in the ultrasonic transmission / reception part. There is a special feature. In the following description, the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 10, the ultrasonic flaw detection inspection apparatus 5 includes a probe unit 10 and a probe unit 10A. The heat transfer tubes 132A and 132B are installed next to each other and are regularly arranged. Therefore, the probe unit 10 and the probe unit 10A are regularly attached to the support means 30 so as to correspond to the arrangement of the heat transfer tubes 132. The control device 80 controls the ultrasonic transmission / reception unit 20 to insert the two probe units 10 and 10A into the heat transfer tube 132A and the heat transfer tube 132B at different input frequencies. As described in the third embodiment, the control device 80 can reduce the noise signal due to the probe unit and make the defect signal easy to see.

  An ultrasonic flaw detection inspection apparatus 5 according to the present embodiment is an ultrasonic flaw detection inspection apparatus that measures a heat exchanger having a plurality of tube members, and includes a plurality of probe units and the guide wave via each probe unit. And an ultrasonic transmission / reception unit capable of receiving a guide wave propagated to the tube member, and the plurality of probe units can simultaneously inspect the plurality of tube members. For this reason, since a plurality of probe parts having different input frequencies in the ultrasonic transmission / reception part are inserted into the plurality of heat transfer tubes and measured, a plurality of heat transfer tubes can be inspected simultaneously. Thereby, a heat exchanger tube can be inspected in a short time.

(Embodiment 6)
FIG. 11 is a schematic diagram of an ultrasonic flaw detection apparatus according to the sixth embodiment. The ultrasonic flaw detection apparatus 6 according to the present embodiment has a plurality of probe parts to be inserted into the heat transfer tubes, and probe parts having different insertion lengths into the heat transfer tubes, which are tube members, to the plurality of heat transfer tubes. It is characterized by inserting measurement data. In the following description, the same components as those described in the above-described embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 11, the ultrasonic flaw detection apparatus 6 includes a probe unit 10, a probe unit 10D, an ultrasonic transmission / reception unit 20, a support unit 30, a probe insertion length variable unit 31, and a probe insertion length variable. Means 31D and a control device 80 are provided. The heat transfer tubes 132A and 132B are installed next to each other and are regularly arranged. Therefore, the probe unit 10 and the probe unit 10D are regularly attached to the support means 30 so as to correspond to the arrangement of the heat transfer tubes 132. The control device 80 controls the probe insertion length variable means 31 and the probe insertion length variable means 31D, and inserts two probe portions 10 and 10D into the heat transfer tubes 132A and 132B with different insertion lengths T1 and T2. Let As described in the first embodiment, the control device 80 acquires the first measurement data under the first measurement condition (step S12). Thereafter, the insertion lengths of the probe unit 10 and the probe unit 10D are switched, and measurement data (second measurement data) under the changed conditions is acquired (step S22). Next, the control device 80 performs signal processing of measurement data as in the first embodiment (step S31).

  An ultrasonic flaw detection inspection apparatus 6 according to the present embodiment is an ultrasonic flaw detection inspection apparatus that measures a heat exchanger having a plurality of tube members, and includes a plurality of probe portions and the guide wave via each probe portion. And an ultrasonic transmission / reception unit capable of receiving a guide wave propagated to the tube member, and the plurality of probe units can simultaneously inspect the plurality of tube members. Since the ultrasonic flaw detection inspection apparatus 6 inserts and measures a plurality of probe parts in a plurality of heat transfer tubes, it can inspect a plurality of heat transfer tubes at the same time. Thereby, a heat exchanger tube can be inspected in a short time.

  The embodiments of the ultrasonic flaw detection inspection apparatus 1 to the ultrasonic flaw inspection inspection apparatus 6 described above can be implemented in combination. For example, after the defect signal is specified by the ultrasonic flaw detection inspection apparatus 1 according to the first embodiment, a reliable inspection result can be obtained by reinspecting the defect signal specified by the ultrasonic flaw inspection inspection apparatus 3 according to the third embodiment. it can.

  The above-described embodiments have been described by taking the inspection of the heat transfer tube of the steam generator, which is the heat exchanger of the pressurized water nuclear plant, as an example, but it can also be applied to boiling water type, fast reactor type and other nuclear plant tube members. It is. It can also be applied to general heat exchangers and thermal power plants. The inspection object of the ultrasonic inspection device and ultrasonic inspection method according to the present invention may be a tube member, and is not limited to the tube member of the heat exchanger.

  As described above, the ultrasonic flaw detection inspection apparatus and the ultrasonic flaw detection inspection method according to the present invention are suitable for non-destructive inspection of a heat exchanger pipe and the like.

1, 2, 3, 4, 5, 6 Ultrasonic flaw detection apparatus 10, 10A, 10B, 10C, 10D Probe unit 11 Guide wave guide unit 12 Guide wave transmission unit 20 Ultrasonic transmission / reception unit 21 Transmission / reception unit 22 Electrical conversion unit 30 Support means 31 Probe insertion length variable means 80 Control device 100 Nuclear power plant 110 Reactor vessel 120 Pressurizer 130 Steam generator 131, 133 Water chamber 132 Heat transfer tube 137 Tube plate 138 Manhole

Claims (10)

A probe unit that is inserted into the tube member of the heat exchanger and propagates a guide wave to the tube member;
An ultrasonic transmission / reception unit capable of transmitting an ultrasonic wave as the guide wave through the probe unit and receiving a reflected wave of the guide wave propagated to the tube member;
A control device capable of controlling the probe unit and the ultrasonic transmission / reception unit;
The ultrasonic inspection apparatus, wherein the control device specifies a noise signal or a defect signal of measurement data by performing signal processing on a plurality of measurement data in the ultrasonic transmission / reception unit under different measurement conditions.   The apparatus further comprises length adjusting means for changing a length of the probe inserted into the tube member, and the control device controls the length adjusting means to set the different measurement conditions. Item 2. The ultrasonic inspection apparatus according to Item 1.   The ultrasonic flaw detection inspection apparatus according to claim 2, wherein as the different measurement conditions, a plurality of pieces of measurement data in the ultrasonic transmission / reception unit are acquired while changing a length at which the probe unit is inserted into the tube member.   The ultrasonic flaw detection inspection apparatus according to any one of claims 1 to 3, wherein a plurality of measurement data is acquired by changing an input frequency in the ultrasonic transmission / reception unit as the different measurement conditions. A plurality of probe parts;
An ultrasonic transmission / reception unit capable of transmitting an ultrasonic wave serving as the guide wave through each probe unit and receiving a guide wave propagated to the tube member;
The ultrasonic flaw detection apparatus according to any one of claims 1 to 4, wherein as the different measurement conditions, measurement data measured by different probe units among the plurality are compared with the tube member of the heat exchanger. The ultrasonic flaw detection apparatus according to any one of claims 1 to 5, wherein a heat exchanger having a plurality of tube members is measured.
A plurality of probe parts;
An ultrasonic transmission / reception unit capable of transmitting an ultrasonic wave serving as the guide wave through each probe unit and receiving a guide wave propagated to the tube member;
An ultrasonic flaw inspection apparatus in which the plurality of probe units can inspect the plurality of pipe members simultaneously.   The said control apparatus judges the waveform signal from which the received signal is fluctuating among several measurement data in the said ultrasonic transmission / reception part in different measurement conditions as a noise signal. Ultrasonic flaw detection equipment.   The control device performs any one or more of signal processing of addition, subtraction, and multiplication of a plurality of measurement data, captures a change in signal intensity after signal processing, and identifies a noise signal or a defect signal. 7. The ultrasonic flaw detection inspection apparatus according to any one of items 1 to 6. Setting a first measurement condition for transmitting and receiving a guide wave to and from the tube member of the heat exchanger;
In the first measurement condition, performing ultrasonic flaw detection by transmitting and receiving a guide wave, obtaining and storing first measurement data;
Changing to a measurement condition different from the first measurement condition, and setting a second measurement condition;
In the second measurement condition, performing ultrasonic flaw detection by transmitting and receiving a guide wave, obtaining and storing second measurement data;
The signal processing of any one of addition, subtraction, and multiplication is performed on the first measurement data and the second measurement data, a change in signal intensity after signal processing is captured, and a noise signal or a defect signal is obtained. An ultrasonic flaw detection inspection method characterized by specifying. Setting a first measurement condition for transmitting and receiving a guide wave to and from the tube member of the heat exchanger;
In the first measurement condition, performing ultrasonic flaw detection by transmitting and receiving a guide wave, obtaining and storing first measurement data;
Variably changing the length of insertion of the probe part into the tube member, and setting a second measurement condition;
In the second measurement condition, performing ultrasonic flaw detection by transmitting and receiving a guide wave, obtaining and storing second measurement data;
An ultrasonic wave characterized by performing signal processing for comparing the first measurement data and the second measurement data, capturing a position change of the waveform signal after the signal processing, and identifying a noise signal or a defect signal. Inspection method.

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