Study on Effective Prestressing Effects on Concrete Containment Under the Design-basis Pressure Condition

Prestressing technology is widely used in nuclear power plant containment building,and the durability of containment structure is affected directly by the distribution and loss of prestressing value under design-basis pressure.Containment structure and the distribution of prestresseing system are introduced briefly.Furthermore,the calculating process of horizontal prestressing bunch loss near the equipment hatch hole is put forward in details,and the containment structure prestressing loss when 5-year pressure test is obtained.Based above analysis,the finite element model of the prestessed concrete containment structure is built by using ANSYS code,the prestressing effect on concrete containment is analysed.The results show that most of the design pressure is beared by the prestressing system under the design-basis pressure,so the containment structure is safe.These conclusions are consistent with prestressing containment system design concepts,which can provide reference to the engineering staff.