This work is devoted to the problem of assessing the functional safety of critical systems. The existing risk analysis techniques have been analyzed and the possibility to apply them for functional safety assessment of critical systems has been considered. The possibility to combine the chosen techniques has been proven and carried out. As a result, the complex technique for functional safety assessment of critical systems has been developed. The tool for automation of the technique has been elaborated. The developed technique and the tool have been tested on the critical systems. Keywords: risk analysis, safety, critical system, assessment, tool, HAZOP, FMEA.
