Ergonomic Work Analysis consists of thorough analysis about the overall performance of sociotechnical systems to improve conditions and / or safety at work. However, during Ergonomic Work Analysis the presence of ergonomists in the workplace may interfere with the progress of work, which may limit the observation period. Organizations that have risk areas has already used simulated exercises to train their professionals. With the powerful simulation technologies available (e,g. Virtual Reality), it becomes increasingly necessary to develop methods and techniques that allow how to perform such training, as close as possible to the actual work activities. It is especially important in the case of simulators for training Emergency situations.In this context, the objective of this article was to verify the potential use of Virtual Reality, with the aid of Ergonomic Analysis (EA), in developing scenarios and virtual environments for simulation and training of Physical Security procedures. After the EA in the work environment of the security guards, several problems were encountered, and recommendations were proposed to improve the working condition of professionals who perform security at the institution. The game engine Unity 3D was used to implement new features to the Virtual Environment of the Instituto de Engenharia Nuclear - IEN.
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