Previous week, between April 12 and 14, the EMUG (European MELCOR and MACCS User Group) meeting was held in Slovenia, organized by the Reactor Engineering Division, JSI in cooperation with the Paul Scherrer Institute from Switzerland. The meeting was attended in-person and virtually by 66 users and developers of the computer programs MELCOR, which is used to simulate severe accidents in nuclear power plants, and MACCS, which is used to simulate the impact of these accidents on the environment. Both programs, MELCOR and MACCS, are developed by the Sandia National Laboratories, USA for the US Nuclear Regulatory Commission.