Last night ENSREG, including the European Commission, reached a consensus on the scope and modalities of a comprehensive and transparent risk and safety assessment ("stress tests") of European nuclear power plants, as requested by the European Council (24/25 March 2011). As requested by the European Council also, ENSREG made full use of available expertise, notably from the Western European Nuclear Regulators Association (WENRA), which had started working on the scope and methodology already at its spring meeting, March 22/23, 2011.