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A formula for calculation of inspection times of monitoring the technical condition of a hazardous industrial facility, as well as a formula for calculation of the number of operation intervals between monitoring events depending on certain values of parameters of reliability of the facility were demonstrated. In addition, the monotonic behavior of the duration of equally possible operational intervals between monitoring events for facilities with monotonic changes in fault occurrence intensity was defined. A monotonic behavior in values of probabilities of flawless performance of the facility within intervals between monitoring events with equal duration of operation and monotonic change in intensity of faults occurrence were demonstrated.

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Indicator of residual life of technogenic-hazardous objects is determined for the for the hazardous operational life duration. Calculation formulas, estimates, and limit values are proved for the determined indicator.