Based on the dynamics of Flibe (2LiF-BeF 2 ), the thermal neutron scattering library (TSL) is generated by NJOY in this paper. We worked on the TSL data through the microscopic analysis. With the increas of temperature and translational weight of liquid Flibe, the inelastic scattering cross section decreases and the average energy of secondary neutron increases. Using TSL of Flibe, the critical calculation for molten salt reactor is also conducted by MCNP. Result shows the k eff is influenced by thermal neutron scattering obviously (about 0.8%). It is suggested that thermal neutron data should be taken into account in molten salt reactor.

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