The User's Guide for UNIRAM software helps analyze the reliability and availability of power generation systems. It follows a methodology outlined in EPRI Report AP-2202 and predicts plant availability and performance measures. The guide explains how to create a model of a power system using availability block diagrams and fault trees. It also covers using the UNIRAM pre-processor program and offers nine execution options for users. The appendixes provide detailed documentation on loading and executing the software.