Accurate simulations of neutron transport within nuclear reactors are an important component in developing safe and efficient reactors and operation protocols. However, high-fidelity simulations of an entire core are often too costly for use in multi-query applications, such as multi-physics coupling, uncertainty quantification, or optimal experimental design. To facilitate efficient simulations, we utilize a simulation scheme that iterates between high-fidelity simulations at the assembly level and low-fidelity simulations at the core level that are nonlinearly coupled. To accelerate this scheme in a non-invasive manner, we utilize the method of forcing factors from inexact Newton-Krylov methods due to the high-level algorithmic and computational similarities.

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