Abstract: Boron (¹¹B) pellet injection is designated as a routine fueling technique for the EHL-2 spherical torus. The predictive modeling of ¹¹B pellet injection for H-mode plasma fueling in EHL-2 has been performed using the three-dimensional (3D) nonlinear magnetohydrodynamic (MHD) code JOREK. The simulation results show that the ¹¹B pellet induces rapid local cooling and temperature profile contraction. This constrains the ablation rate to a relatively low level, enabling it to penetrate effectively through the pedestal region and reach the core up to a position of 0.35 in normalized poloidal flux. After the pellet is completely ablated, approximately 90% of the ¹¹B is deposited inside the separatrix. The increased edge resistivity resulting from temperature contraction modifies the poloidal magnetic flux via Ampère’s law. This perturbs the toroidal current density near rational surfaces, enhances the radial gradient therein and drives multiple tearing modes. Interactions among high poloidal mode (high-m) edge magnetic islands lead to magnetic stochasticity, but the stochastic layer does not expand inward beyond the pedestal during injection. After complete ablation, the growth of tearing modes ceases, suggesting that pellet injection can deliver material deeply without triggering persistently growing MHD instabilities.