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FORMAL SAFETY ASSESSMENT OF A FISHING VESSEL 37

Anchoring,
Dry-docking.

2. Fire accident subcategories
Engine room,
Fish room space,
Wheelhouse,
Accomodation,
Galley.

3. Loss of hull integrity accident subcategories
Hull plating,
Framing,
Bulkheads,
Welds and joints,
Openings or failure of doors,

4. Risk Matrix Approach

Risk matrices provide a traceable framework of the frequency and consequences of hazards. A
risk matrix uses a matrix dividing the dimensions of frequency and consequence into categories.
Each hazard is allocated to a frequency and consequence category and then it gives a form of
evaluation or ranking of the risk. Therefore, the risk matrix is the most important tool that is
provided to the group of experts and is used in the hazard screening process. For each
appropriate combination, an assessment has been made of the frequency (F) of the accident and
the severity (S) of the consequences in terms of human injuries / deaths, property damage / loss
and the degradation of the environment. The corresponding risk ranking number (RRN) is then
selected from the risk matrix table.

In the maritime industry, IMO has introduced a 7×4 risk matrix. To facilitate the ranking, it is
generally recommended to define consequences and probability indices on a logarithmic scale.
A risk index may therefore be established by adding the probability / frequency and
consequence indices.

Risk = Probability x Consequences
Log(Risk) = Log(Probability) x Log(Consequences)

Risk Index = Frequency Index + Severity Index

The risk matrix can now be constructed as follows (MSC Circ. 1023):

Sayı 1, 2015 GiDB|DERGi