DEVELOPMENT OF IN-SERVICE INSPECTION PLANS FOR NUCLEAR-COMPONENTS AT THE SURRY UNIT-1 NUCLEAR-POWER STATION

As part of the nondestructive evaluation reliability program sponsored by the U.S. Nuclear Regulatory Commission at Pacific North west Labor atory, a methodology has been developed for establishing in-service in spection priorities of nuclear power plant components. The method uses results of probabilistic risk assessment in conjunction with the tech niques of failure modes and effects analysis to identify and prioritiz e the most risk-important systems and components for inspection at nuc lear power plants. Surry nuclear power station unit 1 was selected for demonstrating the methodology. The specific systems selected for anal ysis were the reactor pressure vessel, the reactor coolant, the low pr essure injection including the accumulators, and the auxiliary feedwat er. The results provide a risk-based ranking of components that can be used to establish a prioritization of the components and a basis for developing improved in-service inspection plans at nuclear power plant s.