Evaluation of an Irradiated Zr-2.5Nb Pressure Tube Removed From the IgnalinaRBMK Reactor

摘要

The RBMK pressure tube removed from the Ignalina NPP was investigated at Studsvik Nuclear. The destructiveexamination performed after visual inspection included metallographical evaluation and hydrogen measurements, as well as thetension and fracture toughness tests at room temperature and at 300 °C. No significant degradation in material properties hasbeen revealed. The RBMK tube was in very good condition when removed from the reactor and would have been satisfactoryfor further service.