In RiskView, the Consequence Category Score is used to determine ALARP. The Consequence Category Score is dependent on the Category of impact, for example:
with scores ranging from 0.8 to 1.5. The lower the score, the greater the requirement to meet ALARP.
For the Consequence Tolerability, excluding Consequences which are Unmitigated or where the Consequence Category Score, Severity or Incoming Frequency is 0, we calculate the log of the product of Consequence Likelihood and Consequence Severity divided by the Consequence Category Score.
Tolerability = log(Incoming Consequence Likelihood x Consequence Severity / Consequence Category Score)
Where:
| • | The Tolerability is considered acceptable when the Target is Met. This is achieve when the Tolerability Assessment is less than or equal to 0. |
| • | The Tolerability is considered not acceptable when the Target is Not Met. This is achieve when the Tolerability Assessment greater than 0. |
| • | This value gives us, in orders of magnitude, the Control Effectiveness increase required on a particular Consequential pathway to obtain ALARP. If the value is less than 0, the Consequence will be consider to have reach ALARP. For the Overall Risk Scenario Tolerability we sum the values from those Consequences where ALARP has not achieved. Based on the formula, the Consequence Category Score is considered the major variable in determined ALARP and it need to be configured to meet your organisation's policies and requirement. |
