METHOD AND SYSTEM FOR DIAGNOSTICS OF MAXIMUM LOAD-BEARING CAPACITY OF PRESTRESSED PROTECTIVE SHELL OF NUCLEAR POWER PLANT WITH STRANDS WITHOUT ADHESION TO CONCRETE OF SHELL

摘要

FIELD: ensuring the bearing capacity of reinforced concrete protective shells of nuclear power plants.;SUBSTANCE: invention relates to means of ensuring the bearing capacity of reinforced concrete protective shells of nuclear power plants (NPP). A finite-element model of the NPP protective shell is formed, the required initial load-bearing capacity of the NPP protective shell is determined, taking into account data on the real tracing of strands and the forces in them from prestressing obtained from the sensors of the monitoring system and jacks, as well as taking into account the specified physical and mechanical properties of the shell structures. The sensors provide data on changes in the stress-strain state of the protective shell of the NPP, tension forces in the reinforced ropes, taking into account stress relaxation and the possibility of their slipping in the channel-forming agents, creep of concrete and other factors. Based on the obtained data, using the formed finite element model, the maximum load-bearing capacity of the NPP protective shell is predicted when it is loaded with an internal pressure exceeding the design pressure; next, the sufficiency of the tension forces of the strands or the necessary amount of their tightening is determined, or the conclusion that it is necessary to replace the strands is made. ;EFFECT: technical result is the possibility of diagnostics with the required reliability of the maximum load-bearing capacity of the nuclear power plant with strands installed without adhesion to the shell concrete, when loaded with internal pressure exceeding the design pressure, and, as a result, improving the safety of the nuclear power plant.;3 cl, 4 dwg