Background: The transport & conversion devices are important guarantees for normal operation of HTR-PM fuel handling system in normal and fault conditions.Purpose: A conflict of devices’ support design needs to be solved.The flexibility of supports is required because of pipe thermal expansion displacement

while the stiffness is also required because of large devices quality and eccentric distance.Methods: In this paper

the numerical simulation was employed to analyze the seismic characteristics and optimize the support program.Under the chosen support program

the stress calculation of platen support bracket was designed by solidworks software.Results: The supports solved the conflict between the flexibility and stiffness requirements.Conclusions: Therefore

it can ensure the safety of transport & conversion devices and the supports in seismic conditions.