JP2006138797A - System and method for evaluating deterioration of structure member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system and method for evaluating the deterioration of a structure member, permitting appropriately performing sampling from the structure member, or appropriately performing diagnosis of material characteristic in situ, and accurately evaluating the deterioration of the structure member. <P>SOLUTION: This system which samples the structure member, measures the material characteristic, and evaluates the deterioration of the structure member comprises a means for generating and displaying a material characteristic diagnosis item selection screen 3 on which the material characteristic to be measured is displayed when previously displayed combination of either material or deterioration event is selected, and a means for generating and displaying sample minimum size, sampling position, and sampling method displaying screens 4, 5, 6 on which a sample minimum size, a portion permitted to be sampled, or a sampling method, required for material characteristic diagnosis is displayed when the material characteristic to be diagnosed is selected. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention evaluates the soundness of a structural member such as a nuclear power plant and accurately evaluates the degree of deterioration of a structural member as a basic data for predicting future defect progress. And an evaluation method.

  In a plant having a service period of several decades, in order to guarantee the soundness of the plant, it is indispensable to monitor the deterioration state of the structural members constituting the plant. Particularly in nuclear power plants, material deterioration events of concern include sensitization / stress corrosion cracking (SCC), irradiation-induced sensitization / stress corrosion cracking (IASCC), irradiation embrittlement, fatigue, thermal aging (brittleness), etc. There is. For these individual degradation events, there has been a high demand for a degradation state monitoring technique, and a technique for quantitatively evaluating the degradation state has already been developed. For example, as for stress corrosion cracking (SCC), as described in Patent Document 1 below, stress corrosion cracking susceptibility is evaluated under corrosion acceleration conditions using a small test piece taken from a reactor internal structure. There is technology to do.

  As for sensitization (irradiation sensitization / IASCC), as described in Patent Document 2 and Patent Document 3, after the etching process, the metal structure, the width and area of the grain boundary are observed with a microscope, and the image is obtained. There is a method of processing to extract material property values and measuring local sensitization. Further, as described in Patent Document 4, there is a method for detecting a defect caused by fatigue or the like with an electromagnetic coil or the like and evaluating the degree of deterioration. Further, as described in Patent Document 5, a target portion for remaining life evaluation is pretreated by polishing or the like, and the remaining portion is evaluated by measuring hardness or observing a creep cavity. Further, as a method for evaluating material deterioration using an evaluation sample loaded in advance in an actual nuclear reactor or an evaluation micro sample collected from a structural member, there is Patent Document 6 and the like. Non-Patent Document 1 summarizes the status of development of elemental technologies related to the evaluation of deterioration of reactor pressure vessels over time.

However, all of the degradation assessment techniques described in these documents are elemental technologies that evaluate individual material degradation events. For example, the progress of a degradation event is comprehensively evaluated by measuring multiple material properties. When trying to do so, depending on the measurement items of the material properties, taking into account the required sample sampling dimensions and the design strength of the structural member, the appropriate sampling dimensions and sampling positions are derived and presented, etc. There are no examples of systems that enable accurate material property evaluation.
Japanese Patent Laid-Open No. 11-173970 Japanese Patent Laid-Open No. 4-290959 Japanese Patent Laid-Open No. 6-034624 JP-A-6-242076 JP-A-62-245960 JP-A-11-287888 Edited by Tetsuo Shoko, “Aging and Life Prediction of Thermal / Nuclear and Chemical Plant Equipment / Structural Materials”

  As described above, for each of the material deterioration events such as SCC, IASCC, sensitization (including irradiation induction), fatigue and embrittlement that may occur in nuclear power plants, etc., the material characteristics that evaluate the individual deterioration events Diagnosis techniques are being studied. However, when comprehensively evaluating the progress of a certain deterioration event by measuring and diagnosing multiple material properties, diagnosis is required based on the combination of the target material deterioration event and the steel type according to the material property diagnosis item. To automatically extract and display various material properties, and to automatically present the minimum dimensions, possible collection sites or collection methods required for diagnosis when samples are taken from structures to diagnose material properties For in situ (non-destructive) non-destructive diagnosis of material properties, a function that automatically presents measurable sites, and the sampleable dimensions of samples taken for material property diagnosis A function that automatically calculates from the design strength of the member, a function that automatically presents the system, and a function that predicts future defect growth behavior based on the results of measurement and diagnosis of material properties. The function of automatically presenting an appropriate repair method for sampling marks has not been studied, and it is necessary to evaluate the deterioration of structural members appropriately within a range that does not affect the plant operation after evaluation measurement. There's a problem.

  Therefore, the present invention can appropriately perform sample collection from a structural member, or can appropriately perform in situ material property diagnosis, and accurately evaluate the degree of deterioration of the structural member. An object of the present invention is to provide a deterioration evaluation system and an evaluation method for a structural member that can be used.

  The invention of claim 1 is a system in which a sample is taken from a structural member, the material properties are measured, and the deterioration degree of the structural member is evaluated, and one of the combinations of materials and deterioration events displayed in advance is selected. Displays the material characteristic diagnosis item selection screen generation and display means that displays the material characteristics to be measured in case, and displays the minimum sample size or the sampleable part or sampling method necessary for material characteristic diagnosis when the material characteristic to be diagnosed is selected And a means for generating and displaying a minimum sample size, a sampling position and a sampling method display screen.

  According to a third aspect of the present invention, there is provided a material characteristic diagnosis item selection screen generation display means for displaying a material characteristic to be diagnosed when any one of a combination of a material and a deterioration event displayed in advance for a structural member is selected, and a diagnosis. It is configured to include a structure measurement position display screen generation display unit that displays a measurable part on the structure member when the material property to be performed is selected.

  According to a tenth aspect of the present invention, in a system for measuring material characteristics of a structural member and evaluating the deterioration degree of the structural member based on the result, a diagnosis is required from a combination of a target material deterioration event and a material. The material characteristic diagnosis item selection subsystem that extracts and displays material characteristics, and the minimum dimensions required for diagnosis when taking a sample from a structural member and performing measurement diagnosis of material characteristics corresponding to the material characteristics to be diagnosed Alternatively, a sample size / collection position / collection method display subsystem that displays the sampleable part or method, and a structure that displays the measurable part when performing nondestructive diagnosis of material properties in the state of the structure Measurement position display subsystem and sampleable dimensions for calculating and displaying the sampleable dimensions for material property diagnosis from the design strength of the structural member Display subsystem, defect progress behavior prediction subsystem that predicts post-defect defect progress behavior based on the diagnosis result of material characteristics, and sample collection traces by overlay welding or patch plate repair welding or friction welding It is configured by a combination of any one or more of repair method display subsystems that select and display one of the methods of fixing the repair parts with a detachable jig.

  According to the present invention, it is possible to appropriately perform sample collection from a structural member, or to appropriately perform in situ material property diagnosis, and accurately evaluate the degree of deterioration of the structural member. It is possible to provide a deterioration evaluation system and an evaluation method for a structural member that can be performed.

Hereinafter, first to ninth embodiments according to the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIG. 1, the deterioration evaluation system for structural members according to the present embodiment generates and displays a sample collection / in situ nondestructive measurement selection screen 1 for generating / displaying a sample collection / in situ nondestructive measurement selection screen. And material / degradation event selection screen generation / display means for generating / displaying a material / degradation event selection screen 2 for selecting at least one or more of the combinations of materials and deterioration events presented in advance, and items of material characteristics to be diagnosed Material property diagnosis item selection screen generation display means for generating and displaying at least one material property item selection screen 3 for automatically displaying at least one material property item and selecting at least one material property item therefrom, and material property diagnosis by sampling Sample that generates and displays a sample minimum dimension display screen 4 that automatically displays the minimum sample size necessary for sampling, the parts that can be collected, and the collection method A small size display screen generation display means, a sample collection position display screen generation display means for generating and displaying the sample collection position display screen 5, and a sample collection method display screen generation display means for generating and displaying the sample collection method display screen 6 are configured. . Each generation and display means is composed of a computer arithmetic device and a display device.

  In this embodiment, the evaluator selects the sample collection or in situ nondestructive measurement on the sample collection / in situ nondestructive measurement selection screen 1, and then selects the material and material to be evaluated on the material / degradation event selection screen 2. A combination is selected from each of the deterioration events in the deterioration display. In this embodiment, carbon steel (A533B), stainless steel (304 (L), 316 (L), and Ni-base alloy, which are commonly used in nuclear power plants, are shown as examples of materials to be evaluated. Examples of degradation events include general SCC (stress corrosion cracking), IASCC (irradiation accelerated stress corrosion cracking), thermal aging embrittlement, irradiation embrittlement, and fatigue. Based on this input, the evaluation system refers to the database provided in the evaluation system, outputs deterioration characteristics deeply related to both, and displays them on the material characteristic diagnosis item selection screen 3. General diagnosis items in material property diagnosis include tissue observation, hardness measurement, reactivation rate measurement, ultrasonic flaw detection, eddy current flaw detection, mini tensile test, mini Charpy test, mini SSRT. The test (low strain rate tensile test) is set as an item.When the evaluator selects any material property item on the material property diagnosis item selection screen 3, a sample that is predetermined on the screen 4 is referred to the database. The minimum sample size is displayed, the sample collection possible part in the structure is displayed with “◯” on the screen 5, and the sample collection method such as grinding with a grinder with a rotational force A along the weld line is displayed on the screen 6. Displayed automatically.

  According to the present embodiment, it is possible to appropriately collect a sample from the structure member, and to perform a highly accurate deterioration degree evaluation of the structure member.

(Second Embodiment)
As shown in FIG. 2, the deterioration evaluation system for structural members according to the present embodiment generates and displays a sample collection / in situ nondestructive measurement selection screen 1 and generates and displays a sample collection / in situ nondestructive measurement selection screen generation display unit. And material / degradation event selection screen generation / display means for generating / displaying a material / degradation event selection screen 2 for selecting at least one or more of the combinations of materials and deterioration events presented in advance, and items of material characteristics to be diagnosed At least one or more material property diagnosis item selection screen 3 for automatically presenting and displaying a material property measurement item selection screen generating / displaying means, and at least one or more in situ measurable sites of material properties are selected from the material property measurement item selection screen generation / display unit It comprises in situ measurement position display screen generation display means for generating and displaying the in situ measurement position display screen 7. Each generation and display means is composed of a computer arithmetic device and a display device. In FIG. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description of the structure of those parts is omitted.

  In this embodiment, the evaluator selects the in situ measurement on the screen 1 and then selects the combination 2a and 2b of the material and the deterioration event on the screen 2. The evaluation system refers to the database based on this input. Then, the deterioration characteristics deeply related to both are output and displayed on the screen 3. When the evaluator selects the material property item 3 a on the screen 3, the evaluation system refers to the database and displays the in situ measurement position on the screen 7. Here, on the right side of the screen 7, the diagnostic positions are shown as A to F, for example, on the right side, and for the material property diagnostic measurement items selected on the screen 3, the diagnostic positions are designated and displayed as “A to F” with arrows. .

  According to the present embodiment, in-situ material property measurement can be appropriately performed on the structural member, and the deterioration degree of the structural member can be evaluated with high accuracy.

(Third embodiment)
As shown in FIG. 3, the structural member degradation degree evaluation system according to the present embodiment uses the minimum dimension displayed on the screen 4 in the first embodiment (FIG. 1) to obtain the sampling position in the structural member. Is displayed from the design strength of the structural member at the sample collection position selection display generation means for generating and displaying the sample collection position selection screen 5a for selecting the sample collection position and the sample collection position selected on the screen 5a. It comprises sample-collectable dimension display screen generation display means for generating and displaying a sample-collectable dimension display screen 8 for calculating and automatically displaying possible dimensions. Each generation and display means is composed of a computer arithmetic device and a display device. On the screen 8, the sampling method is shown on the left side, and the dimensions for each of the sampling positions A to F are displayed on the right side. Here, the design thickness of the part, the current thickness, etc. can be displayed.

  In this embodiment, the evaluator selects a sample collection position from the range displayed on the screen. Based on this selection, the evaluation system calculates the structural strength of the structural member and displays the sampleable dimensions. According to the present embodiment, it is possible to evaluate the degree of deterioration of the structure member without impairing the structural strength of the structure member.

(Fourth embodiment)
As shown in FIG. 4, the structural member degradation degree evaluation system according to the present embodiment generates a sample collection possible position / defect occurrence position display screen that generates and displays a screen 9 representing a sample collection possible position and a defect occurrence position. Generation of a sample collection status display screen for generating and displaying a display 10 and a screen 10 for capturing and displaying a situation in which a sample is sampled from a defect generation site on a structural member and including a part or all of the defect. It consists of display means. Each generation and display means is composed of a computer arithmetic device and a display device.

  In the present embodiment, in sampling from a defective part on a structure member, either a method for sampling all defects (screen 10a) or a method for sampling a part of defects (screen 10b) is selected. Then, the material characteristics of the collected sample are measured, and the deterioration degree of the structural member is evaluated. When cutting out the entire defect, the risk of subsequent defect progress can be reduced, and the material property value of the defect occurrence part can be incorporated into the defect progress evaluation to evaluate the deterioration degree of the structural member with high accuracy. It can be carried out.

(Fifth embodiment)
As shown in FIG. 5, the structural member degradation degree evaluation system according to the present embodiment generates and displays an in situ measurable position display screen 12 that displays an in situ material property measuring position. The display screen generation / display means and the in situ measurement status display screen generation / display means for generating and displaying the in situ measurement status display screen 13 for imaging and displaying the measurement status. Each generation and display means is composed of a computer arithmetic device and a display device.

  In the present embodiment, the material characteristics are measured in situ in the vicinity of the defect portion, and the deterioration degree of the structural member is evaluated. Highly accurate evaluation can be performed by directly measuring the material property value of the defect occurrence portion and taking it into the deterioration degree evaluation.

(Sixth embodiment)
As shown in FIG. 6, the deterioration evaluation system for structural members according to the present embodiment generates and displays a sample collection history display screen 14 that displays a history of the position, sample shape, and the like of sample collection. It comprises screen generation display means and repair status display screen generation display means for generating and displaying a repair status display screen 15 for imaging and displaying the repair status of the harvested part with a remote camera. Each generation and display means is composed of a computer arithmetic device and a display device.

  In this embodiment, the sampling trace of the sample sampling part is repaired by any one or more combinations of overlay welding, patch plate repair welding, or friction welding (screen 15a). Or you may make it repair by fixing a repair component to the repair object part with the jig | tool which can be attached or detached (screen 15b).

  According to the present embodiment, it is possible to evaluate the degree of deterioration of the structure member while keeping the influence of sample collection low by restoring the structure of the structure member after collecting the sample from the structure member. In addition, the sample collection part can be easily repaired.

(Seventh embodiment)
As shown in FIG. 7, the deterioration evaluation system for structural members according to the present embodiment includes a deterioration event display screen generating / displaying means for generating and displaying a deterioration event display screen 16 for displaying selected material property measurement items, and a structure. Generation of surplus measurement site display screen 17 for generating and displaying surplus measurement site display screen 17 that displays samples or sites that can be evaluated for the above-mentioned material property measurement items among samples collected from materials or in situ measurement surplus It consists of display means. Each generation and display means is composed of a computer arithmetic device and a display device.

The evaluator selects a material property item to be measured by the same procedure as in the first or second embodiment, and performs measurement from the sample collected from the structural member or the in-situ measurement surplus Select the site to be used.
According to the present embodiment, it is possible to easily measure the material properties of the structural member by providing a surplus in advance at a site where sampling measurement or in situ measurement is easy.

(Eighth embodiment)
As shown in FIG. 8, the structural member degradation degree evaluation system according to the present embodiment displays a material property measurement item display that displays a material property measurement item selected by the same procedure as in the first or second embodiment. Optimal measurement in which optimum measurement conditions for each material characteristic are automatically displayed when at least one material characteristic measurement item display screen generation / display means for generating and displaying the screen 18 and at least one material characteristic item 18a to be measured are selected. It comprises an optimum measurement condition display screen generation display means for generating and displaying the condition display screen 19. Each generation and display means is composed of a computer arithmetic device and a display device.

  According to the present embodiment, variations in the material property measurement conditions can be eliminated, so that the reliability of data can be improved and the deterioration degree of the structure member can be evaluated with high accuracy.

(Ninth embodiment)
As shown in FIG. 9, the deterioration evaluation system for structural members of the present embodiment is a material that automatically extracts and displays items of material characteristics that need to be measured from combinations of target material deterioration events and steel types. In the case of measuring material properties by collecting samples from the structural diagnosis item selection subsystem 21 and structural members, the sample size / collection that automatically displays the minimum dimensions necessary for the measurement, the parts that can be collected, or the collection method A position / collection method display subsystem 22, an in situ measurement position display subsystem 24 that automatically displays a measurable site when measuring material properties non-destructively in situ, and material property measurement The sampleable size display subsystem 23 for automatically calculating and displaying the sampleable size of the sample to be collected from the design strength of the structural member, and the measurement result of the material property Based on the defect progress behavior prediction subsystem that predicts the defect progress behavior after cracking and the sample trace, the overlay or repair parts by overlay welding, patch plate repair welding or friction welding are fixed with a removable jig It consists of a repair method display subsystem that automatically displays any selected method.

  According to the present embodiment, structural members are determined by comprehensively determining the position / dimension of sampling for evaluation of deterioration performed by each subsystem, the repair method, or the selection of measurement position in in situ measurement, etc. It is possible to accurately evaluate the degree of deterioration.

The figure which shows the computer display screen displayed in the degradation degree evaluation system of the structure member of the 1st Embodiment of this invention. The figure which shows the computer display screen displayed in the deterioration evaluation system of the structure member of the 2nd Embodiment of this invention. The figure which shows the computer display screen displayed in the deterioration evaluation system of the structure member of the 3rd Embodiment of this invention. The figure which shows the computer display screen displayed in the deterioration evaluation system of the structure member of the 4th Embodiment of this invention. The figure which shows the computer display screen displayed in the deterioration evaluation system of the structure member of the 5th Embodiment of this invention. The figure which shows the computer display screen displayed in the deterioration evaluation system of the structure member of the 6th Embodiment of this invention. The figure which shows the computer display screen displayed in the degradation degree evaluation system of the structure member of the 7th Embodiment of this invention. The figure which shows the computer display screen displayed in the degradation degree evaluation system of the structure member of the 8th Embodiment of this invention. The figure which shows the computer display screen displayed in the degradation degree evaluation system of the structure member of the 9th Embodiment of this invention.

Explanation of symbols

  1 ... Sample collection / in situ non-destructive measurement selection screen, 2 ... Material / degradation event selection screen, 3 ... Material property diagnosis item selection screen, 4 ... Sample minimum dimension display screen, 5 ... Sample collection position display screen, 5a ... Sample Collection position selection screen, 6 ... Sample collection method display screen, 7 ... In situ measurement position display screen, 8 ... Sample collection possible size display screen, 9 ... Sample collection possible position / defect occurrence position display screen, 10 ... Sample collection status display Screen: 10a: Screen for sampling a part of defects, 10b: Screen for sampling all defects, 12: In situ measurement possible position display screen, 13: In situ measurement status display screen, 14: Sample collection history display screen, 15a ... Screen showing repair by welding, 15b ... Screen showing repair by jig fixing, 16 ... Degradation event display screen, 17 ... Extra-score measurement site display screen, 1 8 ... Material property measurement item display screen, 19 ... Optimal measurement condition display screen, 21 ... Material property diagnosis item selection subsystem, 22 ... Sample size / collection position / collection method display subsystem, 23 ... Sample collection possible size display subsystem 24 In-situ measurement position display subsystem.

Claims (10)

  In a system that collects samples from structural members, measures material properties, and evaluates the degree of deterioration of the structural members, the material properties to be measured when one of the previously displayed combinations of materials and deterioration events is selected Material property diagnosis item selection screen generation and display means for displaying the sample minimum size or sampleable location or sampling method necessary for material property diagnosis when the material property to be diagnosed is selected A deterioration evaluation system for a structural member, characterized by comprising a collection method display screen generation display means.   2. The deterioration evaluation of a structure member according to claim 1, wherein the sample minimum dimension / collection position / collection method display screen generation / display means calculates a sample-capable dimension from the design strength of the structure member. system.   When a material property diagnosis item selection screen generation / display means for displaying a material property to be diagnosed when any of the combinations of materials and deterioration events displayed in advance for a structural member is selected, and a material property to be diagnosed are selected A structure member deterioration degree evaluation system, comprising: a structure measurement position display screen generation display means for displaying a measurable part on the structure member.   The deterioration evaluation system for a structural member according to claim 1 or 3, further comprising an optimum measurement condition display screen generating / displaying means for displaying an optimum measurement condition for each material characteristic to be diagnosed.   When a defect has occurred in the structure member in advance using the deterioration evaluation system for a structure member according to claim 1, a sample is taken for a region including a part or the whole of the defect and a material property is measured. A method for evaluating the degree of deterioration of a structural member, characterized by diagnosing and predicting a defect progress behavior after casting using the result.   Using the structural member degradation degree evaluation system according to claim 1, repairing the sampling trace of the sample by a combination of at least one of build-up welding, patch plate repair welding, or build-up by friction welding. A method for evaluating the degree of deterioration of a structural member.   A structure that is repaired by fixing a repaired part to a diagnosis target part by a detachable jig with respect to the sampling trace of the sample using the deterioration evaluation system for a structural member according to claim 1. A method for evaluating the degree of deterioration of a member.   The structure member degradation degree evaluation system according to claim 1, wherein the structure member is manufactured in advance from the same material as the structure member or a material equivalent to the diagnosis target portion when the structure member is manufactured. A method for evaluating the degree of deterioration of a structural member, characterized in that material property measurement is performed on a sample placed at a site that is assumed to receive equivalent aging damage.   When a defect has occurred in the structure member in advance using the deterioration evaluation system for a structure member according to claim 3, material characteristics are measured and diagnosed in a state of the structure in the vicinity of the defect in a nondestructive manner. A method for evaluating the degree of deterioration of a structural member, characterized by predicting defect propagation behavior after casting using the result. In a system that measures material properties of structural members and evaluates the degree of deterioration of the structural members based on the results, extracts and displays the material properties that require diagnosis from the target material degradation events and combinations of materials. Material property diagnosis item selection subsystem, and the minimum size required for diagnosis or the part that can be collected or the sampling method when taking a sample from a structural member and performing a material property measurement diagnosis corresponding to the material property to be diagnosed A sample size / collection position / collection method display subsystem for displaying the structure, and a structure measurement position display subsystem for displaying a measurable part when performing non-destructive diagnosis of material properties in the state of the structure; A sampleable dimension display subsystem that calculates and displays the sampleable dimensions of the sample collected for material property diagnosis from the design strength of the structural member; Defect growth behavior prediction subsystem that predicts post-defect defect growth behavior based on diagnosis results of material characteristics, and overlay or repair parts by overlay welding, patch plate repair welding, or friction welding welding can be attached to and removed from sample sampling traces A deterioration evaluation system for a structural member, comprising a combination of one or more repair method display subsystems for selecting and displaying one of methods for fixing with a simple jig.

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