This paper describes the design and development of a 3D interface in the framework of an application for the monitoring of a radioactive waste storage. It focuses on the description of software solutions by integrating different technologies. We used only free and open-source libraries to develop the 3D environment that were subsequently integrated into the existing web application developed used Java Server Faces. In order to implement 3D graphics we used Away3D, an open source 3D graphics engine for Adobe Flash, written in ActionScript 3 and runnable in every browser that utilizes Adobe Flash Player.