The functional exercise 2 aims to test and to validate the whole IOPES prototype B in a simulated, not hazardous scenario. The exercise took place in TCRH Mosbach (Germany). In this report we present the performance of the IOPES prototype B and we assess the degree of compliance provided by the IOPES system with the CPE needs in an emergency scenario; identify IOPES prototype B limitations and features to be improved in a new release of the system.