Preventative Maintenance Cycle of Contact Switches for Nuclear Power Plants Based on Lifetime Assessment and Economic Analysis

An approach to determine the preventive maintenance cycle was proposed in consideration of the lifetime,optimal cost and economy.Two parameters Weibull distribution was used to calculate the lifetime of contact switch.The block replacement model and age replacement model were built with the objective of optimal cost,and the preventive replacement cycle was accounted.Eight proposals for preventive replacement cycle were given.Economy model was applied to assess those proposals and the optimal proposal was confirmed.