“…The international Phebus FP programme was initiated in 1988 by the French "Institut de Radioprotection et de Sûreté Nucléaire" (IRSN), in cooperation with the European Commission (EC), to investigate key phenomena involved in light water reactor (LWR) severe accidents [1,2]. In addition to IRSN and EC, other partners from countries using nuclear power take part in this programme: Electricité de France (EDF, France), Nuclear Regulatory Commission (NRC, USA), CANDU Owner Group (COG, Canada), Japan Nuclear Energy Safety Organization (JNES, Japan), Japan Atomic Energy Agency (JAEA, Japan), Korea Atomic Energy Research Institute (KAERI, Japan), the Swiss Federal Nuclear Safety Inspectorate (HSK, Switzerland) and the Paul-Scherrer-Institute (PSI, Switzerland).…”