10:20 AM - 10:35 AM
[2I02] FY2016 investigation for improvement of evaluation methods of irradiation effects on reactor pressure vessel and core internals
(2)Fracture toughness evaluation by miniature C(T) specimens on irradiated base metal and weld metal
Keywords:Fracture Toughness, RPV steel, The Master Curve Method, Miniature C(T) specimen
Miniature C(T) specimens fabricated from four thickness locations of IAEA standard material JRQ and a RPV weld metal Linde-80 were subjected to fracture toughness tests to ensure the applicability of miniature specimens for the Master Curve evaluation. Resulted fracture toughness from different two laboratories were comparable with each other, and determined as valid evaluation results. Although several invalid data due to ductile crack growth were generated in testing on Linde-80, the evaluated toughness level was the same as larger (maximum 4 inches) specimens, which did not show ductile crack growth.