Comparison of failure detection capability of available low-voltage cable diagnostic methods

The originally long and further prolonged lifespan of nuclear power plants poses tremendous long-term reliability requirements towards low voltage measurement and control cables. Strict requirements towards their performance are prescribed until the end of the operation of the power plant, including the adverse environment of a loss of coolant accident (LOCA). These requirements cannot be met and verified without diagnostic measurements performed at selected intervals. Various methods have been developed or are investigated to fulfill this task. This article compares the available techniques, mainly focusing on their ability to detect damages that are relevant to LOCA testing. Furthermore, the possible role of partial discharge measurement is proposed.