Basic investigation of aging weld joint and repair weld joint integrity assessment using neutron residual stress measurement method

Obara, Satoshi; Takaya, Shigeru  ; Wakai, Takashi ; Asayama, Tai ; Suzuki, Hiroshi  ; Saito, Toru*; Lauernt, M.*

For the commercialization of fast breeder reactors, it is considered reduction of total cost by elongation of plant service period. For this reason, it is needed to establish the aged weld joint integrity assessment method for future FBR components. Additionally, since it is expected to employ the repair weld for aged structural components, it is essential to investigate the effect of repair weld. To investigate the influence of high temperature-long service on weld joint, it is examined using microscopy, residual stress analysis and hardness tester. In addition, similar examinations are also conducted for repair weld joint to investigate the effect of repair weld.