{"references": ["IAEA, \"Assessment and management of ageing of major nuclear power\nplant components important to safety, \" IAEA-TECDOC-1188, 2000.", "NUREG, \"Literature Review of Environmental Qualification of\nSafety-Related Electric Cables,\" NUREG/CR-6384, 1996.", "IAEA, \"Management of Ageing of I&C Equipment in Nuclear Power\nPlants,\" IAEA-TECDOC-1147, 2000.", "Gazdzinski, R.F., Denny, W.M., Toman, G.J. & Butwin, R.T., \"Aging\nManagement Guideline for Commercial Nuclear Power Plant Electrical\nCable and Terminations,\" Rep. SAND 96-0344, Sandia National Labs for\nthe US Dept. of Energy, 1996.", "Urnay, D.G., Dawson, J., \"Reverse temperature effect during radiation\naging of XLPE cable insulation material,\" (Proc. Of Int. Conf. Aging\nStudies and Lifetime Extension of Materials\", Oxford) Kluwer/Plenum\nPress,London(in press), 1999.", "Gillen, K.T., Clough, R.L., Wise, J., Malone, G.M., \"Explanation of\nenhanced mechanical degradation for radiation-aged polyolefins as the\ntemperature is decrease,\" SAND 94-1104C, Sandia National Laboratories,\n1994.", "International Electrotechnical Commission, Guide for the Determination\nof Thermal Endurance Properties of Electrical Insulating Materials, IEC\n216-1 Part 1: General Guidelines for Aging Procedures and Evaluation of\nTest Results, 1990.", "EPRI, \"Cable Indenter Aging Monitor, \" EPRI NP-7348, 1991 .", "EPRI, \"Evaluation of Cable Polymer Aging Through Indenter Testing of\nIn-Plant and Laboratory-Aged Specimens,\" EPRI TR-104075, 1996.\n[10] U.S. Nuclear Regulatory Commission, \"Environmental Qualification of\nCertain Electric Equipment important to Safety for Nuclear Power\nPlants,\" 1984."]}

The cables in a nuclear power plant are designed to be used for about 40 years in safe operation environment. However, the heat and radiation in the nuclear power plant causes the rapid performance deterioration of cables in nuclear vessels and heat exchangers, which requires cable lifetime estimation. The most accurate method of estimating the cable lifetime is to evaluate the cables in a laboratory. However, removing cables while the plant is operating is not allowed because of its safety and cost. In this paper, a robot system to estimate the cable lifetime in nuclear power plants is developed and tested. The developed robot system can calculate a modulus value to estimate the cable lifetime even when the nuclear power plant is in operation.