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The brief review of the quality control system for complex technical systems is given. A generalizing condition for the analysis and control of safety as the basis for quality control of any complex technical system based on the risk theory has been adopted. The technical risk analysis cannot always adequately evaluate the safety of the structure, so the transition from technical risk to the structural risk of complex technical systems is shown. As an example of such systems, it is proposed to investigate cranes casting bridge type, operating in heavy and superheavy operation modes. Four blocks (subsystems) of the first level of structural risk and ten elements of the second level have been singled out. On the basis of the evolving structural risk theory, its meaningful formulation for complex metallurgical systems is given. A model of structural risk coordinated by goals and tasks has been constructed. The evaluation of structural risk as the probability of catastrophic destruction of a group of objects, metallurgical bridge cranes, will allow one to formulate and analytically determine the parameters of their quality control from the position of safety and reliability.

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