The objective of the BETMI2 benchmark, organized by OECD/NEA (CSNI/WGAMA group) and coordinated by ENEA, is to examine three different severe accident sequences involving safety systems failure or their delayed operation with ASTEC, MELCOR, ATHLET-CD and MAAP codes:

• Sequences where reflooding occurs when the core is still intact and no or only local melt formation has already taken place,
• Sequences where reflooding starts after a significant melting has occurred within the core,
• Sequences with possible corium relocation into the lower plenum and vessel failure.

The kick-off meeting was held on 17-18 February 2011 in Paris. The next progress meeting will be organized on 11-12 July 2011 at the OECD Conference Centre, Paris.

Contact: Alexei Miassoedov
alexei.miassoedov@kit.edu