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Research Papers

Diagnostics and Life-Cycle Assessment of Medium-Voltage Cables in Nuclear Power Plants During Regular Overhaul Process

[+] Author and Article Information
Simon Podkoritnik, Marko Jansa

Milan Vidmar Electric Power Research Institute,
Hajdrihova 2, Ljubljana SI-1000, Slovenia

Stanko Manojlovic

Krško Nuclear Power Plant,
Vrbina 12, Krško SI-8270, Slovenia

Manuscript received June 26, 2015; final manuscript received January 26, 2016; published online October 12, 2016. Assoc. Editor: John F. P. de Grosbois.

ASME J of Nuclear Rad Sci 2(4), 041011 (Oct 12, 2016) (6 pages) Paper No: NERS-15-1129; doi: 10.1115/1.4032782 History: Received June 26, 2015; Accepted January 26, 2016

The reliability of operation of a nuclear power plant substantially depends on the reliability of its individual components. Electric cables, particularly medium-voltage cables, represent an important constituent of the nuclear island as well as of the balance of the plant. It cannot be considered as satisfactory that the redundancy of a particular subsystem is ensured. For this purpose, it is important to check the cable insulation condition, which is supposed to be carried out during the overhaul activities. The lifetime of medium-voltage cables is estimated to attain somewhere around 40 years. However, due to electrical, thermal, and mechanical stresses, it may be significantly reduced. In order to avoid its likely failures and following outages, the insulation must be tested regularly. Based on obtained testing results, the condition of a cable or cable termination can be assessed and repaired or a replacement made, if necessary. The paper presents some of the most important nondestructive diagnostic measurements on cable connections recommended to be done during the overhaul of a nuclear power plant following a good practice of asset maintenance management.

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Copyright © 2016 by ASME
Topics: Cables , Testing , Insulation
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References

Figures

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Fig. 1

Electrical tree and vented water tree in insulation [4]

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Fig. 2

Equivalent electrical circuit of the cable containing a water tree [1]

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Fig. 3

Chart of the change in loss angle

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Fig. 4

VLF system diagram

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Fig. 5

Diagram of line-frequency parallel resonant system

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Fig. 6

40 kV line-frequency resonant power measurement system (Milan Vidmar Electric Power Research Institute)

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Fig. 7

Changing the condition of insulation throughout the lifetime on the basis of tanδ measurements [1]

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Fig. 8

Process of determining the condition of cable insulation (S. Podkoritnik)

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