Since 2004, the regulatory rules in the Brazilian Electricity Sector has changed. The agents
who act in this market have experienced a rise in new business disputes, showing an increase
in competitiveness. The availability of physical assets and maintenance costs are presented as
key points of these agents competitiveness. This work aims to present a methodology of
Availability Analysis of Repairable Systems during the design or operational phases, covering
the measurement of maintenance costs versus the acquisition costs to an expected
performance level. The suggested methodology takes the System Block Diagram and exports
to the Successful Tree Analysis format, composed by logic gates "AND" and "OR" where
each represents a subsystem in the main system. The analyst may re-evaluate the system's
topology, adding or removing redundancies in order to adjust the performance to the
requirements of availability, acquisition and maintenance costs. As results of this work were
identified gaps in the standards rules which defines how to control the assets performance,
was established a systematic integration of modeling techniques for reliability and
availability, performance indicators of Scheduled Maintenance were incorporated, different
scenarios were modeled for an Oil Circulation System and was applied to an entire Hydraulic
Generating Unit by modeling the critical components in the main systems.
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