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In order to ensure the continuity and safe operation of Non-Reactor Nuclear Installation, a programmed system is needed to maintain process equipment and supporting infrastructure. Maintenance activities consist of preventive action carried out by the operator regularly, and curative action carried out when the equipment is damaged or malfunctions. Repair activities are carried out by personnel who are experts in their fields. Since preventive maintenance is routine, its implementation can be scheduled. On the other hand, curative maintenance cannot be scheduled because of its unpredictable nature. EFEI received an operating license in 2001 for its fabrication and quality control (FFL and QC) facilities, while for the conversion facility (PCP) an operating permit was obtained in 2013. Both facilities still hold operating licenses today. Currently EFEI is around 35 years old, so it is certain that the systems, structures and components (SSCs) are ageing. The effects of ageing need to be managed properly as they can have an impact on safety. Therefore, we need an ageing management program that can be implemented effectively (targeted and timely) and efficiently. Changes that occur as a function of time are the ageing of components and equipment in the installation. Ageing can reduce the availability and reliability of the systems, structures, and components (SSCs). This will affect the overall operating performance of the installation. If this ageing occurs in the SSCs which is related to safety functions, it will put the workers, public and environment around the installation in danger. Therefore, it is necessary to know the causes of degradation due to aging so that the effects of aging can be managed properly. [ABSTRACT FROM AUTHOR]