In the original version, the number of Molecular Dynamics simulations was insufficient and the uncertainty of the thermal scattering law data was large. The small number of Molecular Dynamics simulations affects the moderator temperature coefficient of the light water reactors. The number of Molecular Dynamics simulations was increased by 25 times to reduce the statistical uncertainty of the thermal scattering law data. The thermal scattering law data of the new version show good moderator temperature coefficients. This problem was fixed.