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Accuracy improvement of indenting test results by using wireless cable indenting robot

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Abstract

In nuclear power plants, there are many cables that perform safety-related functions. These cables should implement condition monitoring during the operation period in the NPP, in order to assess the remaining qualified life and extend the qualified life. In this study we focused on the indenting method, which can measure the hardness of the cable jacket. This method is selected because it is nondestructive and requires short testing time and small sized equipment. In order to address the problems of the existing indenting test equipment, we developed new indenting test equipment, which could automatically move on the surface of the object cable. The newly developed equipment is designed for a small-sized and lightweight robot using wireless communication in order to implement condition monitoring in a harsh environment or locations that are inaccessible to the tester. The developed wireless cable indenting robot is composed of three parts, mechanical and electrical hardware parts and remote-control part. In order to verify accuracy improvement of indenting test data, an indenting test for cable specimens using both existing indenting test equipment and wireless cable indenting robot was performed. Analysis of the indenting test results shows that the accuracy of the results obtained using the wireless cable indenting robot is improved remarkably.

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References

  1. IEEE std 323-2003, IEEE standard for qualifying class 1E equipment for nuclear power generating stations, IEEE Power Engineering Society (2003).

  2. IEEE std 383-2003, IEEE standard for qualifying class 1E electric cables and field splices for nuclear power generating stations, IEEE Power Engineering Society (2003).

  3. Regulatory Guide 1.211, Qualification of safety-related cables and field splices for nuclear power plants, U.S. Nuclear Regulatory Commission (2009).

  4. Draft Regulatory Guide DG-1240, Condition monitoring program for electric cables used in nuclear power plants, U.S. Nuclear Regulatory Commission (2010).

  5. EPRI, Cable indenter aging monitor, EPRI NP-7348, Electric Power Research Institute (1991).

  6. J. S. Kim, Evaluation of cable life based on condition monitoring, 01 fall meeting of Korean nuclear society (2001).

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Authors

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Correspondence to Sung-Yull Hong.

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Recommended by Editor Jai Hak Park

Kyung-Nam Jang was born in Gwangju, Korea, in 1977. He graduated from Jeonnam National University, Korea, in 2002, and received his M. S. degree from Korea Advanced Institute of Science and Technology, Korea, in 2004. He works as a Researcher at KHNP Central Institute and is interested in equipment qualification.

Jong-Seog Kim was born in Busan Korea, in 1959. He received his Ph.D from Chung-Nam national university in 2005. He works as a principal researcher of KHNP Central Institute and is interested in environmental qualification of NPP.

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Jang, KN., Kim, JS., Jeong, SC. et al. Accuracy improvement of indenting test results by using wireless cable indenting robot. J Mech Sci Technol 26, 2735–2740 (2012). https://doi.org/10.1007/s12206-012-0740-9

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  • DOI: https://doi.org/10.1007/s12206-012-0740-9

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