Читать книгу Risk Assessment - Marvin Rausand - Страница 48

An event that has the potential to cause harm.

From this definition, any event that is part of an accident scenario, including the initiating event, may be classified as a hazardous event. The practical use of this term is discussed under methods for hazard identification in Chapter 10.

Observe that both initiating event and hazardous event are terms that are difficult to give a precise physical meaning. Instead, both can be regarded as analytical terms that are used to identify starting points for the analysis. Because the starting point of our analysis may be chosen more or less freely, it is not possible to pinpoint specific events in a sequence that are initiating and hazardous events, respectively. As a guideline, it may be useful to specify the hazardous event as the first event in the sequence when the situation moves from a normal situation to an abnormal situation. This is not necessarily very precise, but may still be a help in performing risk analyses in practice.

The hazardous event is a central concept in the bow‐tie model of risk analysis, which is described in Section 2.3.4 (i.e. after the examples).