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 safety of graphite moderator reactors. In this study, the oxidation-induced density changes in nuclear graphite for VHTR were determined by a conventional destructive bulk density measurement method (BM), and by a new non-destructive 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 inch diameter and 1 inch height, oxidized to 10% weight loss at 973 K in air for 5 hours). 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. This 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.
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Fourth International Topical Meeting on High Temperature Reactor Technology
September 28–October 1, 2008
Washington, DC, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4855-5
PROCEEDINGS PAPER
Density Change of an Oxidized Nuclear Graphite by Acoustic Microscopy and Image Processing Available to Purchase
Se-Hwan Chi,
Se-Hwan Chi
Korea Atomic Energy Research Institute, Daejeon, South Korea
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Cristian I. Contescu,
Cristian I. Contescu
Oak Ridge National Laboratory, Oak Ridge, TN
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Timothy D. Burchell
Timothy D. Burchell
Oak Ridge National Laboratory, Oak Ridge, TN
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Se-Hwan Chi
Korea Atomic Energy Research Institute, Daejeon, South Korea
Cristian I. Contescu
Oak Ridge National Laboratory, Oak Ridge, TN
Timothy D. Burchell
Oak Ridge National Laboratory, Oak Ridge, TN
Paper No:
HTR2008-58180, pp. 755-759; 5 pages
Published Online:
July 1, 2009
Citation
Chi, S, Contescu, CI, & Burchell, TD. "Density Change of an Oxidized Nuclear Graphite by Acoustic Microscopy and Image Processing." Proceedings of the Fourth International Topical Meeting on High Temperature Reactor Technology. Fourth International Topical Meeting on High Temperature Reactor Technology, Volume 2. Washington, DC, USA. September 28–October 1, 2008. pp. 755-759. ASME. https://doi.org/10.1115/HTR2008-58180
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