Influence of Neutron Irradiation on Partial Energies for Crack Growth in RPV Weld Metal

摘要

The influence of neutron irradiation on temperature dependencies of partial fracture energies for crack initiation, stable crack propagation and crack arrest of reactor pressure vessel (RPV) weld metal during three point impact loading was investigated. It was shone that the partial energy for crack initiation has the biggest contribution to the total fracture energy. It was established that the effect of neutron irradiation on the crack stable propagation energy is stronger that the effect on the crack initiation and crack arrest energies. Prognostic curves of neutron induced shift of total energy and partial energies on the neutron fluence were created and the partial Af values for each partial energy were determined.