Density Change of an Oxidized Nuclear Graphite by Acoustic Microscopy and Image Processing.
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| Title: | Density Change of an Oxidized Nuclear Graphite by Acoustic Microscopy and Image Processing. |
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| Authors: | Se-Hwan Chi1 shchi@kaeri.re.ki, Contescu, Cristian I.2 contescuci@ornl.gov, Burchell, Timothy D.2 burchelltd@oml.gov |
| Source: | Journal of Engineering for Gas Turbines & Power. Sep2009, Vol. 131 Issue 5, p052904:1-052904:4. 4p. 4 Graphs. |
| Subjects: | Graphite, Acoustic microscopy, Image processing, High temperatures, Electric power production, Gas engineering |
| Abstract: | The strong correlation between the density and the physical and mechanical properties of graphite suggests that the method of nondestructive density evaluation could be developed into a characterization technique of great value for the overall improvement of the safety of graphite moderator reactors. In this study, the oxidation-induced density changes in nuclear graphite for very high temperature reactor were determined by a conventional destructive bulk density measurement method (BM) and by a new nondestructive method based on acoustic microscopy and image processing (AM). The results were compared in order to validate the applicability of the latter method. For a direct comparison of the results from both measurements, two specimens were prepared from a cylindrical graphite sample (1 in. diameter and 1 in. height, oxidized to 10% weight loss at 973 K in air for 5 h). The specimens were used for characterization by BM and AM methods, respectively. The results show that, even with a large standard deviation of the AM, the density changing trend from both methods appeared the same. The present observation may be attributed to the fact that AM images reflect characteristic density changes of the graphite sample through the acoustic impedance changes. This study demonstrates the possibility of using AM as a nondestructive technique for the evaluation of density changes in graphite when a database is prepared through a systematic series of experiments. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Engineering for Gas Turbines & Power is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 43426463 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Density Change of an Oxidized Nuclear Graphite by Acoustic Microscopy and Image Processing. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Se-Hwan+Chi%22">Se-Hwan Chi</searchLink><relatesTo>1</relatesTo><i> shchi@kaeri.re.ki</i><br /><searchLink fieldCode="AR" term="%22Contescu%2C+Cristian+I%2E%22">Contescu, Cristian I.</searchLink><relatesTo>2</relatesTo><i> contescuci@ornl.gov</i><br /><searchLink fieldCode="AR" term="%22Burchell%2C+Timothy+D%2E%22">Burchell, Timothy D.</searchLink><relatesTo>2</relatesTo><i> burchelltd@oml.gov</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Engineering+for+Gas+Turbines+%26+Power%22">Journal of Engineering for Gas Turbines & Power</searchLink>. Sep2009, Vol. 131 Issue 5, p052904:1-052904:4. 4p. 4 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Graphite%22">Graphite</searchLink><br /><searchLink fieldCode="DE" term="%22Acoustic+microscopy%22">Acoustic microscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Image+processing%22">Image processing</searchLink><br /><searchLink fieldCode="DE" term="%22High+temperatures%22">High temperatures</searchLink><br /><searchLink fieldCode="DE" term="%22Electric+power+production%22">Electric power production</searchLink><br /><searchLink fieldCode="DE" term="%22Gas+engineering%22">Gas engineering</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The strong correlation between the density and the physical and mechanical properties of graphite suggests that the method of nondestructive density evaluation could be developed into a characterization technique of great value for the overall improvement of the safety of graphite moderator reactors. In this study, the oxidation-induced density changes in nuclear graphite for very high temperature reactor were determined by a conventional destructive bulk density measurement method (BM) and by a new nondestructive method based on acoustic microscopy and image processing (AM). The results were compared in order to validate the applicability of the latter method. For a direct comparison of the results from both measurements, two specimens were prepared from a cylindrical graphite sample (1 in. diameter and 1 in. height, oxidized to 10% weight loss at 973 K in air for 5 h). The specimens were used for characterization by BM and AM methods, respectively. The results show that, even with a large standard deviation of the AM, the density changing trend from both methods appeared the same. The present observation may be attributed to the fact that AM images reflect characteristic density changes of the graphite sample through the acoustic impedance changes. This study demonstrates the possibility of using AM as a nondestructive technique for the evaluation of density changes in graphite when a database is prepared through a systematic series of experiments. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Engineering for Gas Turbines & Power is the property of American Society of Mechanical Engineers and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1115/1.3098415 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 4 StartPage: 052904:1 Subjects: – SubjectFull: Graphite Type: general – SubjectFull: Acoustic microscopy Type: general – SubjectFull: Image processing Type: general – SubjectFull: High temperatures Type: general – SubjectFull: Electric power production Type: general – SubjectFull: Gas engineering Type: general Titles: – TitleFull: Density Change of an Oxidized Nuclear Graphite by Acoustic Microscopy and Image Processing. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Se-Hwan Chi – PersonEntity: Name: NameFull: Contescu, Cristian I. – PersonEntity: Name: NameFull: Burchell, Timothy D. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 09 Text: Sep2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 07424795 Numbering: – Type: volume Value: 131 – Type: issue Value: 5 Titles: – TitleFull: Journal of Engineering for Gas Turbines & Power Type: main |
| ResultId | 1 |
