Safety risk tolerability
2.14.9 The safety risk probability and severity assessment process can be used to derive a safety risk index. The
index created through the methodology described above consists of an alphanumeric designator, indicating the
combined results of the probability and severity assessments. The respective severity/probability combinations are
presented in the safety risk assessment matrix in Figure 2-13.
2.14.10 The third step in the process is to determine safety risk tolerability. First, it is necessary to obtain the
indices in the safety risk assessment matrix. For example, consider a situation where a safety risk probability has been
assessed as occasional (4), and safety risk severity has been assessed as hazardous (B). The composite of probability
and severity (4B) is the safety risk index of the consequence.