A study on the irradiated strength and stress evaluation of nuclear graphite material

In the investigative study of the Isotropic Graphite IG-110 of Toyo Tanso, the shore hardness test, compressive test, bending test and fracture toughness test were conducted. The compressive test, the bending test and the fracture toughness test were performed by MTS-810. Test velocity of the compressive and the bending test were 0.5 mm/min and the fracture toughness test were 0.1 mm/min. The results were compared with manufacturer data of Toyo Tanso. Through irradiation test using HANARO research reactor, hardness and strength of nuclear graphite IG-110 was examined. Strength and hardness of irradiated steel is higher than non-irradiated, but nuclear graphite IG-110 declined unlike steel. To search for characteristic change of nuclear graphite IG-110 under the amounts of neutron, a repeat of the experiment was conducted.