[en] Project Based Learning is a technique devoted to learning by doing. It is quite often used in technological universities since many engineering concepts are predominantly practical notions. The paper deals with a practical experience carried out at Technical University of Catalunya (UPC) in the framework of its Master of Nuclear Engineering. The goal of the project was to help students understanding some practices related to Nuclear Power Plants (NPP) engineering during the operation phase. The exercise has been strongly connected with the concept of sustainability and related to the ideas below. A NPP is designed to operate for 40 for 60 years. During such period of time, in a similar way than in other facilities, different things could happen: • Some components could become obsolete, spare parts unavailable and repairs unfeasible • New regulations could be endorsed • New techniques could offer operation advantages All these items are technological problems that could appear and need to be faced by developing engineering tasks. Project definition has to do with analysing the degraded performance of Steam Generators, its replacement and eventually converting operational problems in business opportunity by implementing a power uprating of the plant. This experience has been an interesting occasion of teaching decision making and feasibility studies.