4th Meeting of the “European MELCOR User Group“ GRS, Cologne, Germany April 16-17, 2012 TitleAbstractSpeakerAgenda List of Participants Opening Remarks M. SonnenkalbMELCOR Code Development Status L. L. HumphriesMELCOR Modeling and Simulation of Fukushima Daiichi Unit 3 Severe Accident Y. ChenDevelopment of an input deck for Fukushima accident, Part1 M. SangiorgiDevelopment of a MELCOR Input Deck for Fukushima Accident, Part2 A. Del CornoMELCOR2.1 code verification on ISP-38 experiment at BETHSY facility N. MosunovaAir ingress experiments Q-10 and Q-16 analysis with MELCOR 1.8.6 L. Fernandez‑MoguelSensitivity study of SFP experiment with MELCOR 1.8.6 YV SFP B. S. JaeckelSNAP Overview J. PhillipsModelling In-Vessel-Retention W. RappUse of MELCOR Calculations in the Frame of Level 2 Probabilistic Safety Assessment of the Belgian PlantsOpen documentC. NgatchouProblems with Core Bypass Atmosphere Freezing of the VVER-1000 and similar Types of Reactors: Related Hints M. KotoucCool-ability of used fuel in storage racks M. LoefflerApplication of MELCOR to Severe Accident Analyses for Spent Fuel Pools of German Nuclear Power Plants T. SteinroetterCoupling MELCOR to other Codes T. SzaboEx-vessel LOCA for the European HCPB TBM system using the pedigreed MELCOR182 for fusion X. Z. JinMELCOR 1.8.6 Volatile iodine release challenges in case of external reactor vessel cooling combined with filtered vent - Effect of pH G. L. HorvathOverview of MELCOR Activities in CIEMAT (2011) C. LopezExperience Gained Running PSA Scenarios with MELCOR 2.1 M. M. StempniewiczMELCOR post-processing using open source tools — 2012 update P. Vokac Contact Nuclear Energy and Safety (NES)Laboratory for Reactor-Physics and Thermal Hydraulics (LRT)Severe Accident Research Group (SACRE)Paul Scherrer Institute5232 Villigen PSISwitzerland Mateusz MalickiOffice: OHSA/C02+41 56 310 2127mateusz.malicki@psi.ch