The overall objectives of the High-Temperature Piping Design Technology Program are to provide design methodology for elevated temperature piping systems, based on experiences with FFTF, LMEC, and CRBRP designs and on operating high temperature piping systems; assess the validity of using current high temperature Code Case 1592 design rules on piping systems; investigate critical piping system design problems from the design criteria viewpoint; and increase the confidence level in high temperature design rules for piping by demonstrating the conservativeness of these rules.