Evaluation of the data base from computer codes calculations of small break LOCA counterpart tests performed in LOBI, SPES, BETHSY and LSTF facilities

A thorough review was made of previous reports dealing with calculation of individual experiments to take into account the overall database from Counterpart Tests. The reference experimental database included facilities and experiments relevant to scaling in nuclear thermal-hydraulics. The Integral Test Facilities (ITF) considered are LOBI, BETHSY, SPES and LSTF. The same Small Break Loss of Coolant Accident (SBLOCA) accident scenario was measured in the four facilities. However six experiments were performed because in each of LOBI and SPES ITF two test were carried out. The former (in each case) was the ‘low’ initial power consistent with the power in the two ITF, the latter (in each case) was the ‘high’ initial power exploiting the capabilities of both SPES and LOBI (in terms of maximum scaled power available). The gathered database includes three main parts: • Geometrical and material configuration of ITF • Boundary and initial conditions for the 6 experiments • Selected time trends (about 50) during the experiments The database constitutes a milestone achievement for the demonstration of thermal-hydraulic system code capabilities addressing the scaling issue. The present report includes description of calculation results obtained by Relap5 code of the CT experiments performed in the listed ITF..