In the risk assessment for the TLU substructure, features of its composition prescribed by the main technical solutions of the project, construction, installation and operation conditions and climatic conditions of the site are taken into account. The selection and validation of the main scenario of failure for the substructure are described. The main damaging factors of the considered scenario of the most severe and most probable failure of TLU substructure are:
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dynamic impact due to tanker lean-on on the TLU;
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dynamic impact of oil and oil vapors explosion;
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thermal impact of pool fire of oil and oil products from pipelines and TLU equipment.
The harmful impacts on the environment in case of the most severe and most probable failure of TLU substructure are pollution of atmospheric air by combustion products of oil and oil products emitted in the air, pollution of sea waters by toxic materials circulating on the TLU (oil, combustive lubricants) and fragments of steel elements of the substructure after their partial or complete collapse due to the failure, and loss of hydrocoles and fish reserves.
The selection and validation of the main failure scenarios of the TLU is made through identification of the hazards typical for the considered structure and with account for the construction and operation conditions and hazardous natural and technical impacts possible at the water territory of the port. The necessary level of details is ensured through developing an as full as possible list of hazardous natural and technical impacts possible at the water territory of the port, and through decomposition of the TLU into their main elements whose faults and malfunctions may cause failures and extreme situations. The full list of hazardous impacts on the TLU includes natural and technical impacts.
