Work-in-progress report on maintenance good practices for motors in nuclear power generating stations. II

For pt.I see ibid. vol.3, no.3, p.589-95 (1988). It is suggested that a key issue in the maintenance scheduling process is the amount of stress placed on the motor by its application. A method is described to identify and combine important motor stress factors based on plant-specific actuarial data, and to use the results to arrive at a prioritized preventive maintenance schedule. The process begins with a review of the unit´s critical motor population, i.e. selected nonsafety-related motors and all safety-related motors. The non-safety-related motors are selected on the basis of potential impact on plant output, cost and availability of replacements. Then the stress factors that can be examined and measured in the field are analyzed to establish a ranking system. The data collected becomes part of a maintenance database to which future data generated by preventive maintenance activities can be added