Analysis for Fast Fracture of Cylinder Section Outside Reactor Core

In this paper, the possibility of non-ductility fracture of the reactor vessel at the life end of 60 years was investigated. The fracture mechanic method was used to calculate the stress intensity factor of the reactor vessel at the life end. The calculation results satisfy the requirement of RCC-M, that is, at the life end, the reactor vessel will not occur non-ductility fracture.