In the event of an imbalance in the volumetric flows in and out of a container, a change of pressure can result within the container. The flow rate entering and exiting the container can be determined using common engineering calculation techniques, either by evaluating the capacity of a single limiting source term or single piping component, multiple piping components in series, the limitations of a fluid driver, or the combined effect of the fluid driver and the intervening piping system. Several cases of overpressure scenarios are evaluated in this manner, including heat exchanger tube failure, inlet control valve failure, and inadvertent valve opening.