JP2019049512A - Clearance measuring system and clearance measuring method - Google Patents

Abstract

To provide a clearance measuring system and a clearance measuring method that efficiently perform measurement processing of a clearance object.SOLUTION: Provided is a clearance measuring system that measures a radioactive concentration of a clearance object generated when demolishing a nuclear facility. The clearance measuring system includes: a shape measuring device for measuring a shape of a cut-off piece, for a cut-off piece after demolishing and cutting of the clearance object; a radiation detector for measuring radiation emitted from the cut-off piece; an approach method processing device for determining a method for making the radiation detector approach the cut-off piece, on the basis of a result of the shape measurement; and a detector approaching device for making the radiation detector approach the cut-off piece in accordance with the method for approaching the radiation detector to the cut-off piece, that has been determined by the approach method processing device.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a radioactive waste measurement system and method, and more specifically, a clearance suitable for highly efficient and highly accurate measurement of clearances generated during operation or decommissioning in a nuclear power plant etc. It relates to a measurement system and method.

  In nuclear power generation facilities, a large amount of wastes such as activated wastes and radioactively contaminated wastes are generated along with dismantling of facilities during operation or decommissioning stage. These wastes are classified according to the degree of contamination, specifically the level of radioactivity concentration. Among these, those with relatively high activity concentration (L1), those with relatively low activity concentration (L2), those with extremely low activity concentration (L3), low level radioactive waste that collectively refers to these, and high Level radioactive waste is buried in the ground according to the level, as in medium depth disposal, shallow pit disposal, shallow trench disposal and geological disposal.

  On the other hand, some wastes are small enough compared with radiation levels in the natural world, and the radiation dose is such that the risk to human health is negligible, and may be excluded from the regulations on radiation protection. There is something. These are called clearance objects.

  Since the clearances do not need to be treated as radioactive materials, if clearance conditions are met, they will be transported out of the nuclear power plant, those that can be reused will be used as resources, and if recycling is not rational. Is not radioactive waste, but can be disposed of like ordinary industrial waste.

  The amount of clearances generated is estimated to be several tens of thousands of tons per standard power generation light water reactor. Therefore, efficient treatment and disposal are required to facilitate the decommissioning of nuclear power plants. On the other hand, the shape of the clearance is not limited to a simple shape such as a plate or a pipe, or may be a complex shape such as a bent pipe or a valve, etc. Further, as described above, since the radiation level is very low, a long measurement time is generally required to accurately measure the clearance level. In addition, since the clearance material is to be distributed to the general society, it is required to ensure traceability so that it can be traced where one product or one product of the clearance material originated.

  As a method of measuring a clearance thing, there is a method of patent documents 1 statement. In the method described in Patent Document 1, clearance objects of various shapes are processed into simple shapes so as to be easily measured, and it is confirmed by measurement before clearance that there is no site of high contamination, and the clearance objects are rectangular The container is housed in a container, and all gamma rays emitted from the clearance are measured from the outside of the container. Further, in the method described in Patent Document 1, traceability is ensured by attaching a bar code to each disassembly waste and managing it.

JP 2007-248066 A

However, in the method described in Patent Document 1, in order to facilitate measurement, it is necessary to process clearances of various shapes into simple shapes. For this reason, work processes may increase and the possibility that efficiency improvement can not be expected is considered as a problem.
When the step of processing into a simple shape is omitted for the purpose of efficiency, in the pre-clearance measuring device described in Patent Document 1, when measuring an object having a complicated shape, the detector shape is fixed. Because the distance to the detector differs depending on the measurement site, it is difficult to measure with high accuracy.

  Further, although the clearance measurement described in Patent Document 1 is made more efficient by measuring a large storage container, the concentration of radioactivity in the storage container is made almost uniform due to the limitations of the measurement method and the evaluation method. It is necessary to make arrangements for that, and efficiency may not be expected.

  Furthermore, in the method of attaching a barcode to each disassembly waste to ensure traceability described in Patent Document 1, it is conceivable that the operation and cost for a huge amount of waste increase. In addition, there is a concern that the individual may be mistaken when pasting the barcode, the barcode may be peeled off, or by artificially replacing, camouflage or replacement of goods may occur.

  In view of the above, it is an object of the present invention to provide a clearance measurement system and method for efficiently measuring and processing clearance objects.

  Another object of the embodiment of the present invention is to provide a clearance measurement system and method for measuring a clearance object with high accuracy. Another object of embodiments of the present invention is to provide a traceability-based clearance measurement system and method.

  In order to achieve the above object, in the present invention, “the clearance measuring system for measuring the radioactive concentration of the clearance generated during dismantling of the nuclear facility, which is a shape of the cutting piece after cutting the clearance Measurement method for measuring radiation, a radiation detector for measuring radiation emitted from a cutting piece, and a proximity method processing device for determining a method for bringing a radiation detector into proximity to a cutting piece based on the result of shape measurement, proximity method According to the proximity method of the radiation detector to the cutting piece determined by the processing apparatus, the clearance measurement system is provided with a detector proximity device for bringing the radiation detector into proximity.

  Further, in the present invention, “the method of measuring the clearance concentration of the clearance material generated at the time of dismantling of the nuclear facility is a shape measurement of measuring the shape of the cutting piece after the dissection and cutting of the clearance thing Processing, radiation measurement processing for measuring radiation emitted from the cutting piece, method determination processing for determining a method for bringing the radiation detector into proximity to the cutting piece based on the result of shape measurement, radiation determined by the method determination processing According to the method of proximity to the cutting piece of the detector, there is provided a radiation detector proximity process for bringing the radiation detector into proximity, according to the method of clearance measurement.

  According to the present invention, it is possible to process clearances efficiently.

  Further, according to the embodiment of the present invention, it is possible to measure the clearance object with high accuracy. Further, according to the embodiment of the present invention, it is possible to measure the clearance with traceability secured.

The figure which shows an example of the processing flow of the clearance measurement method which concerns on Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows an example of an apparatus structure of the clearance measurement system which concerns on Example 1 of this invention. The figure which looked at the state which has arrange | positioned the radiation detector 5 with respect to what divided the bending pipe in half from the top. The figure which shows the AA cross section illustrated in FIG. The figure which shows an example of the processing flow of the clearance measurement method which concerns on Example 2 of this invention. The figure which shows an example of an apparatus structure of the clearance measurement system which concerns on Example 2 of this invention. The figure which shows an example of the processing flow of the clearance measurement method which concerns on Example 3 of this invention. The figure which shows an example of the processing flow of the clearance measurement method which concerns on Example 4 of this invention. The figure which shows an example of an apparatus structure of the clearance measurement system which concerns on Example 4 of this invention. The figure which shows an example of the outline | summary of the cutting method in the clearance measurement system which concerns on Example 5 of this invention. The figure which shows the more detailed installation structural example of the apparatus part 13 which implements a radiation measurement process.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  Hereinafter, a clearance measurement system and method according to a first embodiment of the present invention will be described using FIGS. 1 to 4.

  An example of the processing flow of the clearance measurement method according to the first embodiment of the present invention is shown in FIG.

  In the present processing flow, the cut piece disassembled in the processing step S100 is received, and the shape measurement of the cutting piece is performed in the processing step S101.

  Thereafter, in processing step S102, in order to measure the entire surface of the cut piece by the radiation detector based on the shape measurement result, a process of determining the proximity method and arrangement method of the radiation detector with respect to the cut piece is performed.

  In accordance with the proximity method and arrangement method of the radiation detectors 5 determined by the process of step S102, in the process step S103, the process of actually arranging the radiation detectors 5 in proximity to the cutting piece 1 is performed.

  In processing step S104, a radiation measurement process is subsequently performed by the radiation detector.

  With regard to the cut piece for which the radiation measurement has been completed, processing such as carrying out to a later step or primary storage is performed in processing step S200.

  With regard to each process in the process flow shown in FIG. 1, it is desirable that the following points be further taken into consideration when executing these processes specifically.

  First, regarding the shape measurement process in the processing step S101, if the cut piece is, for example, a half of a pipe, there is a high possibility that the portion corresponding to the inner surface of the pipe is contaminated with radioactivity, but the clearance material It is necessary to measure the radiation over the entire surface of the cutting piece in consideration of circulation. Therefore, it is desirable that the measurement of the shape of the cutting piece be performed on the entire surface of the cutting piece.

  Further, with regard to the process of determining the proximity method and arrangement method of the radiation detector with respect to the cutting piece in the processing step S102, it is preferable to consider the following points.

  As a first point of execution of the processing step S102, the radiation level of the clearance object is very low, so when measuring with high accuracy, a long measuring time is required. In order to reduce the measurement time, ie to increase the throughput of the measurement process, it is necessary to make the radiation detector as close as possible to the radiation source. Therefore, determining the proximity method and arrangement method of the radiation detectors leads to the efficiency of the whole measurement.

  In addition, as a second point in the execution of the processing step S102, as described later, the storage container used for final clearance measurement and storage of clearance objects is a large square of about 1.3m x 1.3m x 1m. Because containers are assumed, it is necessary to be able to measure relatively large pieces. Therefore, although the radiation detector to be used may be a survey meter, a detector which can measure a large area collectively is desirable.

  Further, as the third point in the execution of the processing step S102, there is also a complicated shape of the clearance object, and therefore, measurement along the shape of the cut piece can realize highly accurate measurement. Therefore, a plastic scintillation fiber (PSF) which can measure a wide range at once and is flexible as a radiation measuring instrument is considered as one of application candidates. The PSF is a scintillator material that generates scintillation light by interaction with radiation, which is shaped into an optical fiber, and the difference in arrival time of light incident on the light detectors installed at both ends of the fiber makes it possible on the fiber The light emission position, that is, the incident position of radiation on the fiber and its intensity are measured. The PSF has a length of 10 m to 20 m, and is characterized by having high flexibility as with an optical fiber.

  Further, as a fourth point in the execution of the processing step S102, as one of the processing methods for determining the proximity method and arrangement method of the radiation detector, a disassembly equipment and a shape model having dimensional information of cutting pieces etc. are registered in the database. It is preferable to associate each of the shape models with a predetermined method of proximity and arrangement of radiation detectors to be used. It is preferable to compare the shape measurement result by the shape measuring device with the shape model of the cutting piece, and to determine the proximity method and arrangement method of the radiation detector with respect to the cutting piece.

  Further, as the fifth point in the execution of the processing step S102, as described above, it is not realistic to prepare in advance the shape models of all the dismantling equipment and the cutting pieces since a large amount of clearances are generated. . On the other hand, the shape of the clearance can be classified into a plate, a pipe, a valve, and the like. Therefore, at least one shape model is prepared for each classification. The dimensions of this shape model are made variable as parameters, and the dimension parameter is determined by comparing the shape measurement result by the shape measuring device with the cutting piece. The proximity method and arrangement method of the radiation detectors may be determined in advance as described above. However, it is desirable to prepare a plurality of radiation detectors, for example, ones having different PSF fiber diameters, so that they can be selected according to the dimensions of the cut pieces.

  Moreover, it is also possible to use artificial intelligence (AI) as another method of the processing method of determining the proximity | contact method and arrangement | positioning method of a radiation detector as 6th point on execution of process step S102. We provide various shape models to AI, and learn in advance the proximity method and placement method of radiation detectors. In an actual site, by inputting the shape measurement result by the shape measuring device, the AI derives the optimum proximity method and arrangement method of the radiation detector. Also in this case, it is desirable to prepare a plurality of radiation detectors having different PSF fiber diameters, for example, so that they can be selected in accordance with the dimensions of the cutting pieces.

  An example of an apparatus structure of the clearance measurement system which concerns on Example 1 of this invention is shown in FIG. The configuration of FIG. 2 shows a system configuration for realizing the process flow of FIG.

  In the present measurement system, the received cut piece 1 is conveyed to the front of the shape measurement device 2 by the belt conveyor 11a or the like. This transport processing portion corresponds to the processing of processing step S100 in FIG.

  The shape measurement portion 14 of the clearance measurement system for performing the shape measurement process of processing step S101 in FIG. 1 includes the shape measurement device 2, the holding jig 10a for holding the cutting piece 1, and the rotation for changing the direction of the cutting piece 1 It is composed of a platform 12 and the like. Here, the cutting piece 1 is conveyed by the belt conveyor 11a from the left side to the right in the figure, held by the holding jig 10a as illustrated, transferred to the rotary table 12 and rotated, thereby the shape measuring device 2 The surface shape of the cutting piece 1 is grasped | ascertained by this. The surface shape should be grasped three-dimensionally including front and back.

  Information on the surface shape of the cutting piece 1 is transferred from the shape measuring device 2 to the proximity method processing device 3. The shape measurement result is transferred to the proximity method processing device 3, and the proximity method and arrangement method of the radiation detector 5 to the cutting piece 1 are determined based on the shape measurement result. During this time, the cutting piece 1 is conveyed from the shape measurement position to the front of the radiation measurement position by the belt conveyor 11 b or the like. The portion of the proximity method processing device 3 of FIG. 2 corresponds to the detector proximity method determination processing of the processing step S102 of FIG.

  Next, the cut piece 1 is conveyed by the belt conveyor 11b from the left side in the drawing in the right direction, and is transferred to the radiation measurement unit 13 by the holding jig 10b. The radiation measurement unit 13 includes a radiation detector 5, a detector proximity device 4 to which the radiation detector 5 is attached, and a holding jig 10 b for holding the cutting piece 1. Here, the conveyed cutting piece 1 is held by the holding jig 10b as shown in the drawing, and is moved to the radiation measurement position. After movement of the cutting piece 1, the radiation detector 5 is brought close to the cutting piece 1 by the detector proximity device 4 based on the processing result transferred from the proximity method processing device 3, and radiation measurement is performed. The portion of the radiation measurement unit 13 in FIG. 2 corresponds to the proximity and measurement process in process steps S103 and S104 in FIG.

  After the end of the radiation measurement process, the cut piece 1 is conveyed by the belt conveyor 11c or the like to the place of the post process. This conveyance portion corresponds to the unloading or storage processing of the processing step S200 of FIG.

  In configuring the components of the clearance measurement system shown in FIG. 2, it is desirable that the following points be taken into consideration.

  First, with regard to the shape measurement portion, although a shape measurement device using a laser is illustrated as the shape measurement device 2 in this figure, for example, an optical camera, a stereo camera, or a 3D scanner to which they are applied may be used.

  In the shape measurement portion, as described above, to measure the shape of the entire surface of the cutting piece 1, the portion of the holding jig 10a in contact with the cutting piece 1 rotates in the direction of the arrow in FIG. The front and back surfaces of the cutting piece 1 can be measured. However, a part of the surface of the cut piece 1 is hidden by the portion in contact with the cut piece 1 of the holding jig 10a. In order to measure the shape of the hidden part, once the cutting piece 1 is placed on the rotary table 12 and the rotary table 12 is rotated 90 degrees, the cutting piece 1 is held again by the holding jig 10a, and in this state, shape measurement Should be done again.

  Next, regarding the apparatus portion 13 for performing the radiation measurement processing, in this figure, the case of PSF is shown as the radiation detector 5, but another radiation detector such as a survey meter may be used. The conveyed cutting piece 1 is held by the holding jig 10b as shown in the drawing and moved to the radiation measurement position. After moving the cutting piece 1, the radiation detector 5 is brought close to the cutting piece 1 by the detector proximity device 4 based on the processing result transferred from the proximity method processing device 3. In this figure, PSFs are arranged at the upper and lower sides of the cutting piece 1 for radiation measurement on the entire surface of the cutting piece 1 and they are brought close to each other. However, as in the case of shape measurement, the holding jig 10 or It is also possible to measure with one PSF by using a rotary table (not shown).

  In addition, the apparatus portion 13 for performing the radiation measurement process may be as follows. A more detailed equipment configuration example of the apparatus portion 13 for performing the radiation measurement process is shown in FIG. Here, the cutting piece 1 has a plate shape and is held by the holding jig 10b on the left and right sides. In this case, radiation measurement from the vertical direction is performed. The radiation detector 5 is configured as a detector having a planar spread by arranging the PSFs in a folded manner, and the detector proximity device 4 to which the radiation detector 5 is attached can be configured to be flexible in shape. . In the illustrated example, the upper facilities are 4a and 5a, and the lower facilities are 4b and 5b.

  In this case, since the cutting piece 1 is plate-like, the detector proximity devices 4a and 4b are arranged linearly in a plate-like shape as shown in 4b1 based on the processing result transferred from the proximity method processor 3. , Approaching the cutting piece 1 from the vertical direction. The proximity method processing device 3 instructs how close the device is to approach.

  In addition, the detector proximity | contact apparatus 4a, 4b can implement | achieve the said planar shape or the shape along the half piping shape of the elbow part by raising or suspending at several points.

  In the above description, for the sake of simplicity, the shape of the cutting piece 1 has been described by taking a plate as an example. FIGS. 3 and 4 show the case where the bending tube 1 ′ is used as an example of the proximity and arrangement of the radiation detectors 5 in the case of a complicated shape. FIG. 3 shows a view from above of a state in which the radiation detector 5 is arranged with respect to a bending pipe divided in half, and FIG. 4 shows an AA cross section shown in FIG. Moreover, as an example of the radiation detector 5, the case of PSF is shown.

  In FIG. 3 and FIG. 4, the PSF as the radiation detector 5 is reciprocally disposed inside the elbow-shaped half bending tube 1 ′, so that the longitudinal direction of the half bending tube 1 ′ as well as the bottom portion On the side, radiation measurement of the relevant part is made possible.

  The apparatus portion 13 for performing the radiation measurement process in the case where the cutting piece 1 is in the shape of a half piping of the elbow portion shown in FIGS. 3 and 4 may be performed as follows.

  Referring to FIG. 11, when the cutting piece 1 is large and difficult to support on both sides, it is arranged on a pedestal and measurement is performed only from the side or the top. The upper radiation detector 5a at this time is configured as a detector having a planar spread by arranging the PSF in a folded manner, and the detector proximity device 4a to which the radiation detector 5a is attached has a shape of a half divided pipe It is bent in a U-shape along the length, and is shaped to be bent along an elbow. In this case, although the lower facilities 4b and 5b may not be used, it is conceivable to apply the measurement from the side using the lower facilities. The shape and the proximity position are determined based on the processing result transferred from the proximity method processing device 3.

  Not only in the case of a bent pipe, but when the inner surface is contaminated, it is often handled in a half-cut state because it is required in clearance measurement to expose the contaminated surface when the inner surface is contaminated. From the shape measurement results for the bending tube 1 ', the proximity method processing device 3 determines the proximity and placement method. For example, by disposing the radiation detector 5 as shown in FIG. 3, it is possible to measure the contaminated surface all over.

  Further, as described above, in order to perform the measurement with high accuracy and high efficiency, it is desirable to measure the radiation detector 5 as close as possible to the radiation source. With respect to the shape of the pipe, by arranging as shown in FIG. 4, the distance from the inner surface of the pipe to the radiation detector 5 can be made short and constant. That is, measurement can be performed with high accuracy and high throughput without the need for conversion processing due to differences in distance. Measurement becomes possible.

  According to the first embodiment of the present invention described above, since it is possible to measure with high throughput, it is possible to process the clearance efficiently.

  Further, according to the embodiment of the present invention described above, it is possible to measure the clearance object with high accuracy.

  A clearance measurement system and method according to a second embodiment of the present invention will be described using FIGS. 5 and 6. In the first embodiment, it is assumed that measurement is performed on individual cut pieces, but in actuality, a plurality of cut pieces are subsequently stored and carried out in a large square container, in which case a large square shape is obtained. Since the radiation concentration measurement as the whole container is performed, the second embodiment proposes a clearance measurement system and method including the post-processing of the first embodiment.

  FIG. 5 shows an example of the process flow of the second embodiment of the clearance measurement method according to the present invention. Steps S100 to S104 are the same as in the first embodiment of FIG.

  In the second embodiment, after the radiation measurement process of the process step S104, the cut piece 1 measured in the process step S105 is stored in the storage container.

  After the plurality of cut pieces 1 are stored in the storage container, in the processing step S106, a radioactive concentration measurement evaluation process is performed.

  With regard to the cut piece 1 for which the radioactive concentration measurement evaluation has been completed, in the processing step S200, processing such as unloading for the later steps or primary storage is performed.

  With regard to each process in the process flow shown in FIG. 5, it is desirable that the following points be taken into consideration when executing these processes specifically.

  First, regarding the container storage processing of the cut pieces in the processing step S105, a storage container used for final clearance measurement and storage of clearance objects is assumed to be a large square container of about 1.3 m × 1.3 m × 1 m. ing. A plurality of cutting pieces 1 are stored in the storage container. Although the amount of the plurality of cutting pieces 1 that can be stored in the storage container is limited by the load limitation of the device that transports the storage container including the plurality of cutting pieces 1, it can store a certain amount collected to some extent.

  Further, with regard to the radioactive concentration measurement evaluation processing of the processing step S106, gamma rays emitted from the cutting pieces are measured by a radiation measuring instrument disposed outside the storage container for the plurality of cutting pieces stored in the storage container, From the results, the average radioactivity concentration of the plurality of cut pieces stored in the storage container is calculated and evaluated. Since a large storage container is measured, use of a large area plastic scintillator etc. can be considered for a radiation measurement instrument. By measuring this by facing the six sides of the storage container, large-sized storage containers can be processed at one time, which may improve efficiency.

  On the other hand, when measuring a large storage container with a detector such as a large area plastic scintillator, in order to evaluate based on the average value in each detector, a procedure is taken such that the radioactivity concentration in the storage container becomes approximately uniform. There is a concern that If such a setup is required, the efficiency may be hampered.

  On the other hand, application of the method which can measure and evaluate the radiation concentration distribution in a storage container can be considered using two or more gamma ray spectrum detectors as a radiation measurement instrument. In this method, gamma ray spectra are measured, and the spatial distribution of the activity concentration of each of Co-60 and Cs-137, which is a main measurement nuclide (Key nuclide) in clearance substance measurement, is evaluated. By making it possible to evaluate the radiation concentration distribution, it is not necessary to make uniform the radiation concentration in the storage container, and efficiency can be achieved. In addition, in order to make the radioactivity concentration uniform, it is conceivable to cut the cutting piece as much as possible to achieve uniformity, but if evaluation of the distribution of radioactivity concentration is possible, the cutting piece is stored It is possible to limit the disassembly and cutting to a size that can be stored in a container, and to reduce the number of cutting steps. In addition, since the average radioactivity concentration is evaluated in consideration of the distribution of radioactivity concentration, highly accurate evaluation is possible.

  FIG. 6 shows an example of an apparatus configuration of a clearance measurement system according to a second embodiment of the present invention. The upper part of the figure is the same as the clearance device configuration of the first embodiment.

  After completion of the radiation measurement process, the cutting piece 1 is stored in the storage container 21 by means of a crane 51 or the like. Thereafter, gamma rays are measured by a plurality of radiation measuring instruments 22 disposed on the outer surface of the storage container 21 to evaluate the radioactive concentration distribution and the average radioactive concentration. The radiation measuring instrument 22 shown here represents a gamma ray spectrum detector. In this case, the radioactivity concentration measurement and evaluation device evaluates the radioactivity concentration distribution of the cut pieces stored in the container based on the measurement results of at least one gamma ray spectrum detector and the gamma ray spectrum detector. An evaluation device is provided.

  According to the second embodiment of the present invention described above, the clearances can be efficiently processed by reducing the number of steps for preparation and cutting.

  Further, according to the embodiment of the present invention described above, it is possible to measure the clearance object with high accuracy.

  A clearance measurement method according to a third embodiment of the present invention will be described with reference to FIG. In the second embodiment, the radiation concentration measurement for the entire large rectangular container has been described. However, it is necessary to carry out the second radiation concentration measurement before the delivery before the actual delivery. Section 3 clarifies the processing of this part.

  FIG. 7 shows a process flow of the clearance measurement method according to the third embodiment of the present invention. Steps S100 to S105 are the same as in the second embodiment. In the third embodiment, the radioactivity concentration measurement evaluation database DB1 is provided.

  In this flow, after the radioactivity concentration of the storage container 21 is evaluated in the processing step S106, it is assumed that reconfirmation of the radioactivity concentration will be performed on a later day. Here, the evaluation result data of the radioactivity concentration in the radioactivity concentration measurement evaluation processing step S106 is stored in the radioactivity concentration measurement evaluation database DB1 which is a storage device. After temporarily storing the cut piece in processing step S201, a second radioactivity concentration measurement and evaluation processing (second measurement of radiation concentration by a public organization) is performed in processing step S106 'for reconfirmation. At this time, the evaluation result data of the radioactivity concentration stored in the radioactivity concentration measurement evaluation database DB1 and the evaluation result data of the radioactivity concentration evaluated in the processing step S106 'are compared, and no wrinkles have occurred in both data pipes. For example, the traceability of the storage container 21 can be confirmed, and the cut piece is carried out of the power plant in processing step S202.

  In this case, a radioactivity concentration measurement evaluation data storage device for storing radioactivity concentration measurement evaluation data, and a second radioactivity concentration distribution evaluation device may be provided.

  Traceability can be secured by the third embodiment of the present invention described above.

  A clearance measurement method according to a fourth embodiment of the present invention will be described using FIGS. 8 and 9. In the fourth embodiment, since the clearance material is reused after being unloaded, a process is provided that enables source confirmation of the clearance material at the time of reuse at the unloading destination.

  FIG. 8 shows an example of the process flow of the clearance measurement method according to the fourth embodiment of the present invention, and shows an example of a method for securing traceability after the cutting piece 1 is carried out of the power plant. is there. In the fourth embodiment, in addition to the radioactivity concentration measurement and evaluation database DB1, a shape measurement database DB2, an unloading source device information database DB3, and a radiation measurement database DB4 are provided.

  Steps S100 to S202 are the same as in the third embodiment. However, in the shape measurement processing step S101, export source device information data representing from which device the cutting piece 1 to be measured has been disassembled after the processing is stored in the export source device information database DB3 as a storage device. The shape measurement data is stored in a shape measurement database DB2 which is a storage device. Further, in the radiation measurement processing step S104, after the processing, radiation measurement data is stored in a radiation measurement database DB4 which is a storage device.

  In FIG. 8, the processing steps S100 to S106 (S106 ′) and the processing steps S201 and S202 are the processing contents in, for example, the power plant which is the delivery source of the cutting piece, and the processing step S401 newly added in the fourth embodiment. Steps S404 to S404 are processing at the delivery destination. At the discharge destination, when reusing the cut piece, a scene where it is desired to confirm the source and the measurement value is assumed, and the flow of the confirmation processing is shown.

  In order to backtrace the cut piece at the discharge destination, a second shape measurement process is performed in process step S401. Here, since use of a cutting piece other than a power plant (the carrying out origin of cutting piece 1) is assumed, it is thought that a tablet terminal, an optical camera, etc. can be used as a shape measurement processing device. Of course, it is also possible to apply the method and apparatus described in the first embodiment.

  Next, in processing step S402, the second shape measurement processing result is received and the shape measurement database DB2 stored in the storage device is referred to, and the shape measurement data stored here and the shape measurement obtained by the second shape measurement processing are performed. The data is compared, and the process of comparing and identifying the cut pieces is performed.

  In processing step S403, when the cutting piece to be measured is identified, the discharge source device information database DB3 which is a storage device is referred to, and from this, the device information data regarding the cutting piece is called. Furthermore, the radiation measurement data base of the cutting piece is referred to with reference to the radiation measurement database DB4 which is a storage device, and processing of correlating these pieces of information is performed. Further, in processing step S402, processing for displaying the associated information is performed. The display may be, for example, a tablet terminal, a mobile terminal such as a notebook PC, or a desktop PC.

  FIG. 9 shows an example of a device configuration of a clearance measurement system according to a fourth embodiment of the present invention. The delivery source is provided with a shape measurement database DB2, a delivery source device information database DB3, and a radiation measurement database DB4. These are communication facilities such as the network 30 under the control of the verification and identification device 402 and the information association device 403. Is linked with the destination through There is a cut-in piece carried for reuse at the carry-out destination, and the reuse user at the carry-out destination wants to confirm the source of the cut piece and the measurement value prior to reuse. Reference numeral 404 denotes a display processing device.

  For this confirmation process, the user at the delivery destination uses a tablet terminal as an example of the shape measurement processing device 31. Here, the camera function of the tablet terminal is used to take a picture of the cutting piece 1 whose traceability is to be checked. In shape measurement, at least one photograph is required, but it is desirable from the viewpoint of shape measurement accuracy that there are a plurality of photographs taken from different directions.

  These photographs are integrated into shape measurement data 1v, which is transferred via the network 30 to each processing unit and storage unit of the export source.

  The transferred shape measurement data 1v is compared with the shape measurement data stored in the shape measurement database DB2 in the collation identification device 402 to carry out the matching / identification of the cutting piece 1 concerned. With regard to the identified cutting piece 1, the device information data of the cutting piece 1 stored in the unloading source device information database DB3 and the radiation measurement data of the cutting piece 1 stored in the radiation measurement database DB4 in the information associating device 403 To perform data association. These pieces of information are organized by the display processing device 404, transmitted again to the tablet terminal which is the shape measurement processing device 31, and displayed on the screen as the association information 32.

  As described above, by using the shape information as the unique information of the cutting piece 1, it is possible to reduce, for example, the work and cost for attaching a bar code or an IC tag to the cutting piece 1, and to attach the barcode or IC tag. You can eliminate the possibility of mistaking individuals at the time of installation, peeling off of barcodes and IC tags, or concerns of camouflage and reassignment.

  Traceability can be secured by the fourth embodiment of the present invention described above.

  A fifth embodiment of the present invention will be described with reference to FIG.

  FIG. 10 shows an example of the outline of the cutting method in the clearance measuring method according to the fifth embodiment of the present invention.

  In Examples 1 to 4, the cut surface of the cutting piece 1 is described as being treated cleanly. Since the measurement accuracy of a shape measuring apparatus such as a laser shape measuring instrument and a 3D scanner in recent years has been improved, there is a possibility that the difference in size of an individual whose cut surface has been processed cleanly can be measured. However, the difference is small, and it can not be denied that the processing time may be long to identify individuals of almost the same shape, which may in turn be a factor that inhibits efficiency.

  In FIG. 10, the cutting piece 1 cut | disconnected by the cutting device 41 is shown. As the cutting device 41, a heavy machine cutter is shown as an example. The cutter for heavy machinery is expected to have a shape in which the cutting surface of the cutting piece 1 is broken as shown in the figure, since it cuts the object to be cut so as to crush or tear it off rather than cutting it cleanly. Also, it can be cut in a shorter time than normal cutting. In addition to the cutter for heavy equipment, even with a thermal cutting device such as an arc saw, the cutting surface can be broken by cutting at high speed.

  As described above, it is possible to ease the shape measurement accuracy necessary for individual identification by cutting with the cutting surface intentionally broken by high-speed cutting, and processing for individual identification It is also possible to shorten the time.

  According to the embodiments of the present invention described above, it is possible to treat the clearance efficiently.

  Further, the embodiment of the present invention described above facilitates securing of traceability.

  By using the method of the present invention, the radioactive concentration can be measured with high efficiency and high accuracy for radioactive wastes having various radioactive concentration levels as well as clearance levels, and traceability can be ensured.

1: Cutting piece 1 ': bending tube 1v: shape measurement data 2: shape measuring device 3: proximity method processing device 4: detector proximity device 5: radiation detector 10a, 10b: holding jig 11: belt conveyor 12: rotating table 21: storage container 22: radiation measurement instrument 30: network 31: shape measurement processing device 32: association information 41: cutting device 51: crane DB1 to DB4: database 402: verification identification device 403: information association device 404: display processing apparatus

Claims (14)

A clearance measurement system for measuring the radioactive concentration of clearance material generated at the dismantling of a nuclear facility, comprising:
With regard to a cut piece after disassembling and cutting a clearance thing, a shape measuring device that measures the shape of the cut piece, a radiation detector that measures radiation emitted from the cut piece, and the cut piece based on the result of the shape measurement A proximity detector for positioning the radiation detector according to a proximity method processing device for determining a method of bringing the radiation detector into proximity and a proximity method of the radiation detector to the cutting piece determined by the proximity method processing device The clearance measurement system characterized by having. The clearance measurement system according to claim 1, wherein
The clearance measurement system, wherein the radiation detector is a flexible detector. The clearance measurement system according to claim 1 or 2, wherein
The plurality of cutting pieces whose radiation has been measured by the radiation detector are housed in a container, and the radioactivity concentration is collectively measured and evaluated for each of the containers containing the plurality of cutting pieces, and radioactivity concentration measurement evaluation data A clearance measurement system comprising a radioactivity concentration measurement and evaluation device for obtaining The clearance measurement system according to claim 3, wherein
The radioactive concentration measurement and evaluation apparatus evaluates the radioactive concentration distribution of the cut pieces housed in the container based on the measurement results of the at least one gamma ray spectral detector and the gamma ray spectral detector. A clearance measurement system characterized by comprising an evaluation device. The clearance measurement system according to claim 3 or claim 4, wherein
A clearance measurement system comprising: a radioactivity concentration measurement evaluation data storage device for storing the radioactivity concentration measurement evaluation data; and a second radioactivity concentration distribution evaluation device. The clearance measurement system according to any one of claims 1 to 5, wherein
A shape measurement data storage device for storing shape measurement data by the shape measurement device; a radiation measurement data storage device for storing radiation measurement data of the cutting piece by the radiation detector; and a second method for measuring the shape of the cutting piece And identifying each of the cutting pieces from the shape measurement data stored in the shape measurement data storage device and the second shape measurement data acquired by the second shape measurement device; An association processing device that performs association processing with information on an apparatus in which a piece has occurred and the radiation measurement data stored in the radiation measurement data storage device, and a display device that displays the result of the association processing Clearance measurement system. The clearance measurement system according to any one of claims 1 to 6, wherein
What is claimed is: 1. A clearance measurement system, comprising: a cutting device that cuts each cutting piece into different shapes when disassembling a clearance object. A clearance measurement method for measuring the radioactive concentration of clearance material generated at the time of dismantling a nuclear facility,
About the cut piece after dismantling and cutting off the clearance thing, based on the result of the shape measurement process which measures the shape of the cut piece, the radiation measurement process which measures the radiation emitted from the cut piece by a radiation detector, Radiation detection for bringing the radiation detector into proximity according to a method determining process for determining a method for bringing the radiation detector into proximity to the cutting piece, and a method for bringing the radiation detector into proximity to the cutting piece determined by the method determination process A clearance measurement method characterized in that the apparatus has proximity processing. The clearance measurement method according to claim 8, wherein
And processing for deforming the shape of the radiation detector having flexibility according to the shape of the cutting piece or based on the result of the shape measurement, and processing for bringing the radiation piece into proximity to the cutting piece. How to measure the clearance. The clearance measurement method according to claim 8 or 9, wherein
The container is characterized in that it has a radioactive concentration measurement and evaluation process in which the clearance material whose radiation has been measured by the radiation measurement process is stored in a container, and a plurality of the cut pieces are collectively measured together with the container. And, how to measure the clearance. The clearance measurement method according to claim 10, wherein
The measurement evaluation processing result of the radioactivity concentration is stored, and the batch evaluation processing of the radioactivity concentration for the container evaluated is performed again, and the measurement evaluation processing result of the radioactivity concentration and the lump of the radioactivity concentration again A method of measuring a clearance, comprising processing for comparing evaluation processing results. The clearance measurement method according to any one of claims 8 to 11, wherein
A process of acquiring second shape measurement data of the cut piece, a comparison process of comparing the shape measurement data of the cut piece with the second shape measurement data, and identifying the cut piece from the result of the comparison process A clearance measurement comprising: an identification process, a process of associating information of an apparatus at which the cutting piece identified by the identification process is generated, and information of the radiation measurement process, and a process of displaying the associated information Method. The clearance measurement method according to any one of claims 8 to 12, wherein
A method of measuring a clearance, the method comprising: cutting the cut pieces into different shapes in disassembling the clearance. The clearance measurement system according to any one of claims 1 to 7, wherein
The radiation detector is a flexible PSF, and the detector proximity device supports the PSF with a planar spread and deforms it into a shape based on the result of the shape measurement to form the cutting piece A clearance measurement system characterized in that the system is in proximity.

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