Position of long-term prediction model in aging management of nuclear power plant safety cables

Polymeric insulating materials used for safety-related cables in nuclear power plants are subject to thermal and radiation environment. The durability of such materials has been preserved through environmental qualification, but recently it also becomes necessarily to develop condition monitoring methods for aging management programs in order to adjust to plant life management. Such activities require some existing technologies to be re-validated. Understanding the degradation phenomena and long-term degradation prediction are found to be prime important in the following two kinds of points; i.e., view unification on type tests and technology development in condition monitoring. The present research completed a correlation map and a road map for element issues that still need to be solved.