VERIFICATION TESTS OF NEUTRON SHIELDING MATERIALS AND SHIELDING ASSESSMENT

A combined test (neutron irradiation and heating) and a thermal test were performed for neutron shielding materials MREX® applied to MSF cask, which has been developed in Mitsubishi Heavy Industries, LTD (hereinafter called MHI), to confirm the extent of damage of neutron irradiation and fire. Simultaneously, shielding calculation was conducted considering the damage to verify shielding performance after the thermal test. These verification results proved that MREX® has sufficient shielding performance and its durability