Mechanical Testing Technique of Reduced Samples

Abstract

The study of the state of fragility of structural steels used in nuclear installations is of vital importance when managing the life extension of the installation. Since the pressure vessel is a non-redundant element, knowledge of embrittlement due to neutron damage is essential to guarantee the integrity of the installation. To guarantee the integrity of the RPR, surveillance programs are carried out that include “Charpy” impact test samples. As a result of the activation of the materials by the neutron flux and the mass of each Charpy sample, these tests must be carried out in special facilities, called hot cells, in order to shield the β γ radiation emitted by the samples and reduce the rate. of doses to which personnel will be exposed. It is for these reasons that the Radiation Damage division is working on the study of reduced sample tests using the Small Punch Test and its relationship with the results obtained through standardized Charpy-type tests.