Maintenance Strategies for Degrading Structures in NPP's Based on Time-Dependent Reliability Models

摘要

The deteriorating / degrading processes affect both structures and equipment in nuclear power plants, but the monitoring of the effects of aging as well as the ways of correcing them have specific features. The degradation in strength of a component with random damage is approached in terms of various models. Time-dependent reliablity is essentialy involved in selecting optimum inspection / maintenance strategies able to keep the failure porbability of a component or structure below an established target value. We propose a couple of ways to integrate certain methods for reliability assessment and maintenance strategies with models based on damage indices and matrices, state transition probability matrices and seismic vulnerability functionals.