Study on Dimension of Insert Materials in Reconstitution by Welding of Reactor Pressure Vessel Surveillance Test Specimen

Abstract

In order to quantitatively discuss the insert material dimensional conditions in reconstitution by welding of reactor pressure vessel surveillance test specimens, the effect of heat recovery zone and heat-affected zone at the welds of the reconstituted specimens on the Charpy impact test results were investigated through numerical analysis. The results suggested that it is necessary to pay attention new conditions comparing the current standards, when welding was performed using a high energy density heat source, where the heat-affected zone and heat recovery zone are expected to be reduced due to lower heat input. Meanwhile, the effect on the Charpy impact test results when the plastic zone generated in the test before reconstitution was included in the insert material was examined by the numerical analysis. Based on the results, the dimensional conditions of the insert material when including the remaining plastic zone were also discussed.