Study for Improving an Accuracy of Portable Cable Aging Tester

Cables are one of the long life items that have not been considered for replacement during the design life of a nuclear power plant[(hereafter referred to simply as NPP)]. Since extending the lifetime of a NPP is one of most important concerns in the global nuclear industry, extending the cable life beyond the design life has become one of the major issues. To extend the cable life, it is first necessary to prove that the design life is too conservative compared with actual aging. There are two kinds of method for determining install life of cable. One is conventional method which determines the install life by using experiment data. The other one is condition monitoring method which determines the lifetime by measuring the aging condition of plant cable. Condition monitoring method is getting prevalent since it can make possible the extension of cable life. KEPRI has developed new portable cable indenter which can be used for condition monitoring of cable aging. Indenting method and test results to find best accuracy of indenting is described herein