Introduction. Beginning this paper considers the important measures determining the state of integrated security of facilities of the fuel and energy complex. It says about necessity regular equipment diagnostics of automated process control system (APCS). There is a serious risk of unforced human error. So it says about special automated systems of fire and explosion safety such as means of control of APCS. It is necessary to keep in mind that automated system of fire and explosion protection (ASFEP) is a part automated control system of technological process. The study aims to build a mathematical model of comprehensive safety of objects of fuel and energy complex in APCS. A special evaluation function was chosen. This function is the dependence of the detector on the vector of controlling purposes. The method of assessing the reliability of ASFEP is described using the vector of planning purposes. Methodology. Diagnostic fire prevention events are described. Besides their specificities and frequency are mentioned. It was agreed that implementing of digital twin depend to foreign technologies significantly. This fact actually affects of a sustainability of manufacturing process at facilities of the fuel and energy complex. To study the integrated security in the APCS a mathematical model was built. A detector is an important object constructed model. The corresponding function is formed for connection of detectors operation with stabilizing procedures. The criteria for assessing the reliability of the equipment of the first level of APCS were determined. The local and integral quality indicators are presented. In addition the vector of planning purposes is considered for assessing the reliability of automated system of fire and explosion protection. Results. It is important to analyze the local indicators separately. As an example the resource indicator of quality is described. This example leads to an important conclusion about special conditions of functioning of the equipment. The possibility of using the methodology of strategic planning as a part of information and analytical system for increase of reliability and survivability of APCS is shown. Conclusion. The paper concludes that the tools of strategic planning as a subsystems of automated system of fire and explosion protection are able to provide the necessary diagnostics of the equipment of the first level of informing the decision-maker.