
Risk Acceptability Analysis ◾ 235
Table 6.7 Summary of Risk Reference
Risk Classication Class of Consequences
Fatality/
Year
Health
Effects/
Year
Property
Damage
($)/Year
Life Span
Shortened/
Year
Naturally occurring (act of God)
Catastrophic 9.5 × 10
−7
4.8 × 10
−6
0.02 2.8 × 10
−2
Ordinary 6.8 × 10
−5
3.8 × 10
−4
2.8 0.2
Man-originated catastrophy
Voluntary 1.8 × 10
−6
1.8 × 10
−6
0.38 5.8 × 10
−3
Regulated voluntary 2.8 × 10
−5
2.8 × 10
−6
0.38 5.8 × 10
−2
Involuntary 9.8 × 10
−8
4.8 × 10
−7
1.8 2.8 × 10
−2
Ordinary 4.8 × 10
−6
2.8 × 10
−5
1 9.5 × 10
−3
Involuntary 5.8 × 10
−4
2.8 × 10
−1
200 1
Voluntary 9.5 × 10
−5
5.8 × 10
−2
40 0.1
Regulated voluntary
Man-triggered catastrophy
Involuntary