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Quantitative risk assessment is a powerful but complex and time-consuming task, which requires a significant amount of information and sophisticated models for the analysis of a very high number of scenarios even for rather simple plant layouts. The availability of software tools that support the risk analyst is therefore crucial. In this chapter, two tools that support the quantitative analysis of Natech risk are presented. The risk figures resulting from the application of these tools can then be used for comparison with quantitative risk-acceptability criteria.

This chapter sets the stage for the chapters that follow by introducing the topic of Natech risks, including a definition of the term, presenting the main characteristics of Natech accidents, and giving an overview of the objectives and scope of the book.