Internal controls is a research concept investigating the intrinsic mechanisms and systems designed to regulate processes and manage risks within complex physical or engineered systems. It examines the design, implementation, and effectiveness of these internal regulatory structures, feedback loops, and safety protocols. Characterized by its focus on endogenous mechanisms for maintaining stability, ensuring safety, and achieving operational objectives, this concept is significant for understanding the reliable and controlled functioning of critical infrastructure, particularly in fields like nuclear engineering where precise management of high-energy reactions is paramount for safety and efficiency.