Background: China experimental fast reactor（CEFR） is the first fast reactor in China

the piping designs are very important for the fast reactor.Purpose: The purpose is to improve the economy of pipeline design for the fast reactor.Methods: According to the optimization principles

redesign the support system of emergency decay heat removal system.Results: The piping of emergency decay heat removal system meets the ASME standard stress limit value under various prospective loads

and reduces the number of dampers

spring hangers.Conclusions: We accumulate layout experience for the support design of high temperature piping by the optimization design for emergency decay heat removal system

lay the foundation for the fast reactor piping design in the future.