Worked on the idaholab/moose repository to enhance the numerical robustness of steady-state detection within the AuxiliarySystem. Focused on resolving a critical issue where NaN values could arise in the computation of relative change norms, particularly when auxiliary variables remained constant during simulations. Addressed this by implementing a targeted bug fix in C++ and supplementing it with a dedicated regression test to ensure ongoing stability. Applied expertise in numerical methods and rigorous testing practices, utilizing both C++ and INI for configuration. The work improved simulation reliability and test coverage, contributing to the overall stability and maintainability of the codebase.