This paper reformulates nuclear fusion within the MUT v5.8 framework, interpreting it as a phase-locking event between nodes of the Background Scalar Field. The resonance condition is derived deterministically using the MUT constant � and the local scaling factor � at subatomic scales. Fusion energy output is expressed as the surplus scalar field flux released during the merging of nuclei, providing a predictive, frequency-based framework for binding energies across the periodic table. This supplement offers a foundational approach to controlled nuclear fusion via phase coherence rather than thermal pressure.