Limitation in Risk Assessment
When using the QRA results for decision
making purposes or when chartering a QRA Study, we must recognise and respect
the limitation in risk assessment due to the fact that quantitative risk
analysis is subject to several theoretical limitation lists.
|
Completeness |
There
can never be a guarantee that all accident situations, causes, and effects
have been considered |
|
Model
Validity |
Probabilistic
failure models cannot be verified. Physical phenomena are observed in
experiments and used in model correlations, but models are, at best,
approximations of specific accident conditions |
|
Accuracy/Uncertainty |
The
lack of specific data on component failure characteristics, chemical and
physical properties and phenomena severely limit accuracy and can produce
large uncertainties |
|
Reproducibility |
Various
aspects of QRA are highly subjective-the results are very sensitive to the
analysts assumptions. The same problem, using identical data and models, may
generate widely varying answers when analyzed by different experts |
|
Skill
Unavailable |
The
accuracy and corresponding uncertainty of a risk estimate depend heavily upon
the expertise and judgement of the analyst |
|
Inscrutability |
The
inherent nature of QRA makes the results difficult to understand and use |
