Because this was more of a personal project than a demand from a customer, the requirement assessment process was somewhat abbreviated. However, some of the needs were dictated by failures of previous tools, so a little background is in order.
A virtualized Industrial Control System (ICS) modeling program was provided by a vendor, but it never worked as desired. Two of the scenarios were irrelevant to the organization's mission, while the other two scenarios were broken: if a circuit breaker was opened, there were no cascading effects, like other circuit breakers opening. Therefore, when cyber security personnel were attempting to identify and protect critical components, there were no consequences felt within the system.
The physical ICS model used by the organization was ready for expansion, and one request was for a fuel storage and transfer system...