eseményfa

An eseményfa, translating to "event tree" in English, is a diagrammatic method used in system analysis and safety engineering to represent the possible outcomes of an initiating event. It starts with a single initiating event and branches out to show subsequent events, both successes and failures, that can occur. Each branch represents a specific sequence of events, leading to a final outcome, which can range from the successful operation of a system to a hazardous event.

The construction of an eseményfa typically begins with a clearly defined initiating event, such as a component failure or human error. From this initial event, branches are drawn to represent the next possible occurrences. These subsequent events are often binary, indicating either success or failure of a protective system, human action, or other relevant factor. For instance, if the initiating event is a pump failure, subsequent branches might represent the success or failure of a backup pump or an alarm system.

The purpose of an eseményfa is to systematically identify and analyze all potential accident scenarios arising from a specific initiating event. By visualizing the sequence of events, engineers can determine the probability of various outcomes, identify critical safety functions, and assess the effectiveness of safety measures. The method helps in understanding how multiple failures can combine to lead to an undesirable consequence, or how successful interventions can prevent such consequences. Eseményfas are valuable tools for risk assessment, safety design, and accident investigation.