Abstract
The importance of investigating the dynamic properties of main circulation pipelines (MCP) is determined by the high requirements set forth for their reliability. Equations describing small pipeline oscillations are derived using familiar principles of mechanics. The effectiveness of the use of the described complex theoretical-experimental approach is illustrated by computational data and experiemnts with pipelines of six-and four-loop main circulation circuits (MCC) of power plants. In both cases the MCC consists of six (or four) similar loops, each of which includes a steam generator, main circulation pump, and gate valves, together with pipelines connecting the reactor. A multichannel measuring system is shown with the compulsory condition that registration and processing be carried out simultaneously in analyzing experimental data to ensure the correct reestablishment of vibration forms. It is concluded that the assignment of the life of a pipeline system and its fittings can be substantiated with consideration given to the method of evaluating the allowable number of cycles; their remaining service life can also be determined.
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