Abstract
Fluid temperature fluctuates at an incomplete mixing area of high and low temperature fluids in nuclear components. Temperature stratified layer tends to appear at cooled stagnant branch pipe. To prevent thermal fatigue due to above thermal loads, the JSME guideline is adopted. Development of knowledgebase and sophisticated method for thermal fatigue was planned to validate and justify the above guideline which was not revised. This paper describes the objectives and the plan for thermal fatigue issue.
