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Tolerability of Risk
Tolerability of Risk leads to criteria for judging whether a risk is unacceptable, tolerable
or broadly acceptable. Action taken to reduce risk follows the principle of going so far
as is reasonably practicable (“SFAIRP”) in order to reduce risk to a level which is as
low as is reasonably practicable (“ALARP”). SFAIRP refers to the effort and resource
that is put into achieving ALARP. So the aim is to go SFAIRP to get the residual risk
ALARP. Basically the two concepts work together to achieve a single safer output.
Figure below outlines the framework applied to assess the tolerability of risk. KMRL
carries out a qualitative analysis, supported by a quantitative estimate, of the risk to
those individuals considered most at risk within the group being assessed.
If this quantification indicates that, for an individual, the risk of fatality exceeds 1 in
1,000 per year for employees and suppliers, or 1 in 10,000 per year for a member of
the public, then the risk is regarded as intolerable. Under such circumstances, KMRL
would take immediate action to reduce the risk to below these levels, including if
necessary suspending the activity giving rise to the risk.
