Model developed with the objective of assessing new safety performance indicators of the future air traffic management system within APACHE project (SESAR Exploratory Research project). The model represents a part of the APACHE System–a platform consisting of simulation, optimization and performance assessment tools. Developed model contains three modules: separation violation detection module, TCAS activation module and risk of conflict assessment module. The model application is illustrated by four scenarios: one referent and three solution scenarios (each involving the application of a certain SESAR solution). Three traffic demand levels were used, each containing planned flight trajectories crossing the FABEC airspace during 24 hours. Simulation results show capabilities to calculate certain safety performance indicators and to provide valuable safety feedback to traffic and airspace planners. Also, benefits of different SESAR solutions have been estimated.