OS0843 Proposal of a Guideline for Thickness Management of Wall Thinning T-Joints

Abstract

Although the required minimum thickness (tsr) of T-joints (tees) of class 2, 3 and lower classes of nuclear power plants in Japan is calculated from the design pressure and temperature for design, there are neither any rules nor standards for thickness management of wall thinning T-joints for fitness for service. This paper describes additional results of parametric study and proposes a guideline for thickness management of wall thinning T-joints. In other papers related to this project, the experiment and numerical simulation results are reported. This paper refers to these results and performs further investigation under the consideration of The Japan Society of Mechanical Engineers rules on design, construction and fitness for service.