Application of the ATHLET/COBRA-TF thermal-hydraulics coupled code to the analysis of BWR ATWS

A description of the thermal-hydraulics coupling methodology between ATHLET/COBRA-TF is given. The multi-scale thermal-hydraulics coupling was implemented inside the SALOME platform using the MEDCoupling interface and some of the NURESIM platform interpolators. Finally, the coupled ATHLET/COBRA-TF model for the Oskarshamn-2 NPP is presented and the main results of the ATWS transient analysis are discussed. The work was carried out in the frame of the European NURESAFE (NUclear REactor SAFEty Simulation Platform) project of the 7th EURATOM Framework Program, aimed at addressing the engineering aspects of nuclear safety of light water reactors.