Despite the fact that the risk has been determined to be acceptable or deemed tolerable, it is still needed to bring the risk downwards and demonstrate they are as low as reasonably practicable (ALARP), e.g. as implied under COMAH.
Demonstration of ALARP can be achieved by considering additional potential risk reduction measures to see if the implementation is reasonably practicable, which requires the use of a Cost Benefit Analysis. If the cost of an additional measure is deemed ‘grossly disproportionate’ in comparison with the level of risk reduction achieved then there is no requirement to install it, but the opposite is also true.
At Green World, we have recognized tools and techniques for dealing with all of these issues, delivering reliable results that have proved acceptable to the Regulators over many years.