抄録
Concept of development in strength evaluation for fast reactor vessels was introduced. Based on the characteristics of reactor vessel for developing fast breeder reactor, creep-fatigue strength and ratcheting deformation criterion are under developing. For the creep-fatigue strength, intermediate dwelling creep-fatigue, aging effect and strain concentration are selected as developing items. The ratcheting deformation criterion will be determined by ratcheting fatigue and ratcheting creep-fatigue test results.
