Annex 1 
39 
Hull-retaining configuration of the substructure 
The following evaluations are required: 
• Hull-retaining behaviour of the substructure 
Evaluation of the hull-retaining behaviour of the substructure shall be provided as part of a risk ana 
lysis. The method of the risk analysis is described in f541. for example. The method should be based 
on the Hazardous Incident Ordinance (Storfallverordnung), the British Safety Case Regulations for 
offshore installations f551 and the IMO regulations. 
• Quantitative risk analysis. 
The quantitative risk analysis evaluates the dangers according to their probability of occurrence and the 
extent of the damage that could be occasioned by this danger. The following or equivalent safety analy 
tical methods should be used: 
1) Hazard analysis. 
Possible danger statuses are identified and their consequences and effects ascertained and evalu 
ated based on a failure effect analysis. 
2) The ascertained danger statuses are compared to the probabilities of occurrence. This is used for 
preparing a risk matrix linking the categorised occurrence frequencies with categorised conse 
quences (Table 3). A combination of probability and consequence is evaluated. Permitted areas are 
shown here in light grey and encompass numbers 1 - 3. 
Catastrophic 
4 
5 
6 
7 
Serious 
3 
4 
5 
6 
Considerable 
2 
3 
4 
5 
Not significant 
1 
2 
3 
4 
Frequency of 
occurrence of the 
consequence 
Extremely rare 
Rare 
Occasional 
Frequent 
Table 3: Risk matrix with risk priority numbers 
Quantitative correspondences between frequencies of occurrence and their consequences are de 
fined in Tables 4 and 5. 
qualitativ [1/a] 
Offshore Wind Turbine / Ship 
Environment 
Safety 
Frequent 
H > 10' 1 
H >2 • 10' 1 
H > 10' 1 
Occasional 
10' 1 > H > 10' 2 
2 • 10' 1 > H > 2 • 10' 2 
10' 1 > H > 10' 2 
Rare 
10' 2 > H > 10' 3 
2- 10' 2 > H > 2 • 10' 3 
10' 2 > H > 10' 3 
Extremely rare 
10' 3 > H 
2 • 10' 3 > H 
10' 3 > H 
Table 4: Frequency of occurrence: Number of cases per year