Operating Experience and Aging Assessment of Component Cooling Water Systems

摘要

Aging of Component Cooling Water (CCW) Systems in nuclear plants has been characterized using the Aging and Life Extension Assessment Program (ALEAP) Systems Level Plan developed by Brookhaven National Laboratory. Failure data from various national data bases were reviewed and analyzed to identify predominant CCW failure modes, causes and mechanisms. Time dependent failure rates for major components were calculated to identify aging trends. Plant specific data were obtained and evaluated to supplement data base results. A computer program (PRAAGE) was developed and implemented to model a typical CCW system design and perform PRA calculations. Time dependent failure rates were input to the program to evaluate the effects of aging on component importance and system unavailability. Changes in both component importance and system unavailability with age were observed and are discussed. 10 refs., 15 figs. (ERA citation 13:024383)