MARICO Marine NZ Limited WELLINGTON HARBOUR PORT AND ...

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Report No: 05NZ104 WELLINGTON HARBOUR Issue: Issue 1.1 Operational Risk Assessment 3 CRITERIA FOR DEVELOPMENT OF RISK MANAGEMENT 3.1 RISK MANAGEMENT DEFINITIONS Using the risk matrix (Table 1, below) taken from Annex A, each hazard was scored against a scale of 1 to 10 for each of the four consequence categories within the NZ Risk Assessment Guidelines, forming part of the Port and Harbour Marine Safety Code (i.e. impacts on: Life; Property; Environment; Harbour Stakeholders). Where:- C o C4 5 6 7 8 10 n s e C3 4 5 6 7 9 q u C2 3 3 4 6 8 e n c C1 1 2 2 3 6 e C0 0 0 0 0 0 Frequency F 5 F 4 F 3 F 2 F 1 Table 1 - Risk Matrix 0 & 1 Negligible Risk 2 & 3 Low risk 4, 5, 6 Assessed to be in the ALARP region 7, 8 & 9 Significant Risk 10 High Risk From the frequency and consequence data (see Annex A), risk scores were obtained for each hazard using these criteria, in both the ‘most likely’ and ‘worst credible’ scenarios (i.e. providing eight risk scores per hazard). Each hazard was scored optimistically, to provide the risk assessment with a cautious approach when the average situation is taken into account. Greater Wellington Regional Council / CentrePort Ltd Page 7 of 102
Report No: 05NZ104 WELLINGTON HARBOUR Issue: Issue 1.1 Operational Risk Assessment It should be noted that occasionally, most likely scenarios can generate higher risk levels than worst credible; this is due to the increased frequency naturally associated with the most likely event. In effect, the assessment is scoring the risk associated with two different outcomes from the same initiating event. This tends to occur when consequence levels are similar between most likely and worst case and/or where the frequency of the worst credible is very much less than that of the most likely. Where the most likely event does show higher risk levels it is worthy of special note as, for example, in the case of berthing contact, it may be suggesting that a large number of small berthing contact damages are of greater loss significance than a single heavy contact at a much lesser frequency. 3.1.1 Hazard Ranking for Risk Mitigation Assessment – Hazman Software The risk data of each of the four categories (Life, Property, Environment and Port Business) was analysed within the Hazman software to obtain four indices for each hazard as follows: a) The average risk value of the four categories in the ‘Most Likely’ set. b) The average risk value of the four categories in the ‘Worst Credible’ set. c) The maximum risk value of the four categories in the ‘Most Likely’ set. d) The maximum risk value of the four categories in the ‘Worst Credible’ set. Average risk values are sensitive towards hazards that score moderately or highly over a number of categories, whilst the maximum risk values are sensitive towards hazards which score particularly high in any category. These values are combined in the Hazman software to produce a numeric value representing each of the four indices. The hazard list was then sorted in order of the aggregate of the four indices to produce a Ranked Hazard List, in descending order, with the highest risk hazards prioritised at the top. This list, comprising 78 hazards, is produced in full in Annex E. This Ranked Hazard List describes the Risk Profile of the Harbour with regard to navigational operations. The use of the Most-Likely and Worst-Credible approach is very useful in obtaining a transparent risk assessment in the eyes of practical stakeholders, and these abound around maritime activities. The most likely event references outcomes that those with professional experience of the harbour can relate to. The concept of the Worst-Credible event is a consequence of outcome that is a realistic worst accident outcome. This is Greater Wellington Regional Council / CentrePort Ltd Page 8 of 102
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