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| NKS Programme Area: | NKS-R | | Research Area: | Plant life management and extension | | Report Number: | NKS-247 | | Report Title: | Wire System Ageing Assessment and Condition Monitoring (WASCO) | | Activity Acronym: | WASCO | | Authors: | M. Ekelund, P. F. Fantoni, U.W. Gedde | | Abstract: | Nuclear facilities rely on electrical wire systems to perform a variety of functions for successful operation. Many of these functions directly support the safe operation of the facility; therefore, the continued reliability of wire systems, even as they age, is critical.
In this report 3 techniques for cable global ageing assessment were tested and evaluated. The EAB technique is a destructive, local technique that is often used as a reference for other methods. The indenter is a local, in-situ mechanical technique that is currently quite often used in NPPs. LIRA is an electrical method, full line, in-situ. LIRA correlated quite well with EAB and both tend to flatten when the ageing time reaches 40 years. The only cable type that was difficult to assess for all the 3 methods was the medium type in air environment. These tests considered only thermal ageing, up to 50 years and should be completed by considering also gamma irradiation ageing. | | Keywords: | Condition monitoring, cable aging, transmission lines, hot spot detection, fault detection, frequency domain reflectometry, time domain reflectometry, standing wave reflectometry, LIRA, positron | | Publication date: | 01 May 2011 | | ISBN: | ISBN 978-87-7893-319-5 | | Number of downloads: | 2824 | | Download: |  NKS-247.pdf |
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