The European Council outlined in its decision 2006/976/EURATOM the following objective for the research area “management of radioactive waste”: “Through implementation-oriented RTD, the activities aim to establish a sound scientific and technical basis for demonstrating the technologies and safety of disposal of spent fuel and long-lived radioactive wastes in geological formations ...”In the FP7 work programme 2010 (European Commission C(2009)5946 from 30 July 2009) it is stated that the expected impact of projects should be that they contribute “to the progress towards the implementing of geological disposal in line with the Vision Report and initial roadmaps of IGD-TP and the 2020 objectives of the SET-Plan, together with significant advances in the treatment and/or understanding of key remaining issues. In particular, this should lead to demonstrable improvements in robustness of associated performance and safety analyses, and ultimately to increased confidence in the safety case ...”Waste implementers (WMOs) being deeply involved in experiments in underground laboratories (SKB, Andra, Nagra and Posiva) address these objectives by implementing a joint collaboration regarding large underground concept experiments “LUCOEX”, which meets the FP7 work programme theme of Fission-2010 1.1.1. The included experiments will provide a check on the suitability of the different emplacement concepts and a possibility to understand and compare important parameters for the implementation and the long-term safety of the concepts. Important experience is expected to be obtained regarding testing and improving of methods, equipment, technologies, processes or operability related to the construction, operation and closure of a repository system. The key technical areas to address will be gallery construction, manufacturing and emplacement of buffer around waste canisters, emplacement of waste packages, and backfilling and sealing of galleries.