Table presents a comparison of ReaxFF calculations for tungsten BCC lattice and W-dimer against experiments, first-principles calculations, and two of the widely used bond order-based potentials in the field of fusion materials (Li et al. and Juslin et al.. The valence force field parameters for tungsten (W-W-W) were trained. We followed the training methodology presented by Shin et al. to obtain a good agreement between ReaxFF and DFT for the strain -energy relationship (supporting material (SM), Fig. ). EC = cohesive energy, a = lattice constant (Å), B = bulk modulus (GPa), Cij = stiffness coefficient (GPa), Evf = Vacancy formation energy (eV), Evm = Vacancy migration energy barrier, ESIA = Selfinterstitial formation energy (eV), d-ijk = dumbbell along the ijk direction, t = tetrahedral, o = octahedral. r0 = length of the equilibrium bond in nm. All energies are in eV.