M.A. de Jong
Beoordeling van risico-analyse methoden.
Report 96.3.LT.4786, Transport Technology, Transport Engineering
A CE-mark on a product shows that the product concerned satisfies the
Machinedirectrix. The Machinedirectrix prescribes minimumdemands for safety,
health, environment and consumer protection. Application of harmonized norms
can prevent much work. The European Commission has ordered to raise these
norms. According to the principle of supposition-of-agreement, a
manufacturer who satisfies the harmonized norms, satisfies the
Risk assessment is a part of the procedure for CE-marking.
Several methods for risk analysis are available for this risk assessment.
The comparing methods as checklists, the fundamental methods as Hazard and
Operability Studies and the logic diagram methods as Fault Tree Analysis.
It is important to document the results and the remarks accurately.
To weigh the measures for eliminating of reducing the risks,
the risks have to be estimated or quantified. Some methods for risk
analysis can simply be completed with a quantitative analysis. Other
methods require a separate risk estimation procedure. A Relative Ranking
method can be used for this. In this case, risk has to be seen as a
product of chance and effect. The results have to be handled carefully,
because they are mostly less accurate than they seem to be.
It has to be known which risks are acceptable, for deciding
which risks have to be reduced or eliminated. Acceptance lines has to be
defined for this. Societal acceptance of risks defines these lines. It is
important to be able to compare the risks found with risks known.
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