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Objectives/Scope This study aims to investigate the effects of CO2 injection well transients on both surface and subsurface components of Carbon Capture, Utilization, and Storage (CCUS) systems. The research focuses on well shut-ins and restarts, analyzing their impact on pressure profiles, temperature distributions, and CO2 phase changes throughout the integrated system. The scope encompasses the entire CO2 injection pathway, from surface facilities to the storage reservoir, with the goal of identifying critical design risks and operational challenges. Methods, Procedures, Process An advanced integrated commercial surface-subsurface modeling tool is employed to simulate various transient scenarios in a representative CCUS system. The model incorporates detailed modelling of the injection well, and the reservoir model. A series of simulations are conducted to replicate different transient scenarios focusing on shut-ins and restarts, with high- resolution temporal and spatial outputs capturing the propagation of pressure waves, temperature fluctuations, and phase behavior changes. Sensitivity analysis is performed to assess the impact of key parameters such as injection rate, reservoir properties, and equipment specifications on system response to transients. Results, Observations, Conclusions Results indicate that transient events can induce significant pressure and temperature fluctuations throughout the system. Shutdowns and restart could induce forces and stress on the tubing that it was not originally designed to withstand and also lead to low temperatures in the system with a potential risk of hydrate formation. The integrated modeling approach reveals complex interactions between surface and subsurface components, highlighting the limitations of standalone models in capturing system- wide transient effects. Novel/Additive Information This study represents a novel application of integrated surface-subsurface modeling to analyze the full- system impacts of CO2 injection well transients in CCUS operations. By simultaneously considering surface facilities, wellbore dynamics, and reservoir behavior, this study provides unprecedented insights into the propagation and consequences of transient events throughout the entire CO2 injection pathway. The findings underscore the critical importance of integrated modeling approaches in CCUS system design and risk assessment, challenging the adequacy of traditional, compartmentalized modeling strategies. This work contributes valuable knowledge to the field of CCUS engineering, offering a foundation for developing more robust project design, operational guidelines, and risk mitigation strategies for large-scale CO2 storage projects.