Page - 899 - in Book of Full Papers - Symposium Hydro Engineering

hydraulic structures includes development and implementation of measures aimed to prevent possible failure. The Federal Law “On the safety of hydraulic structures” requires the following documents to be developed by the owners of hydraulic structures:  hydraulic structure safety declaration — a document, in which the hydraulic structure safety is substantiated and measures concerning its safety control are defined according to its class during the whole life-cycle of the structure from designing to conservation or demolition; the safety of every hydraulic structure, whose failure can lead to an emergency, must be declared;  hydraulic structures safety criteria—the limiting values of quantitative and qualitative factors of the hydraulic structure condition, representing the allowable failure risk of the structure and being accepted by federal authorities, who are in charge of government supervision of the safety of hydraulic structures;  the amount of harm that can be done to the life or health of individuals, to the property of individuals or legal persons caused by the failure of the hydraulic structure;  the plan of measures concerning maintenance and advancement (if needed) of the required level of safety. These documents undergo public examination, are accepted by hydraulic structures supervision authorities and coordinated with the Ministry of Emergency Situations of Russia regional authorities. When accepting the safety declaration, supervision authority sets its validity period, which cannot exceed five years. On the grounds of the accepted safety declaration, the supervisory authority issues the permission for operation. According to adopted classification, a hydraulic structure can have one of the following safety levels: normal, reduced, unsatisfactory (low) and dangerous. For hydraulic structures with “normal” safety level, the safety declaration and operation permit are issued for five years. When the safety level is “reduced”, both documents are issued for four years. Hydraulic structures with unsatisfactory safety level both safety declaration and operation permit cannot be issued for the period longer than three years. The exact period is specified by expert commission depending on the circumstances which caused safety reduction. If a hydraulic structure’s safety level is “dangerous”, supervisory authorities do not accept safety declaration and operation permit is not issued. In this case the owner must as soon as possible develop and implement measures aimed to gain an acceptable safety level. For the period of implementation, the design operation mode can be limited and supervisory authorities intensify their control over such structures. Safety declaration must be revised within six months after detection of the following circumstances:  changes of operating conditions, which influence on the safety of hydraulic structures;  damages and emergencies;  changes of emergency management conditions. 899