Quantitative Risk Analysis (QRA)
The quantitative risk analysis (QRA) is based on a methodology approach aiming to identify the existing sources of risks in an activity, as well as the risks and the consequences those risks could have if they occurred.
The risk is analyzed qualitatively, by clearly defining its nature and, also quantitatively, by calculating the scope of the consequences, as well as the frequency of occurrence.
In many cases, only a qualitative risk analysis is sufficient, but this is not enough when we are facing an activity regulated by SEVESO regulations, where there are risks of serious accidents due to the handling of dangerous substances and mixtures.
The quantitative risk analysis is necessary because the risk is high and would have serious consequences for the facilities, the workers and also for the environment outside the plant.
Facilities in which a quantitative risk analysis is necessary, much more complex and exhaustive than a mere qualitative analysis, it is mandatory when we are talking about complex and dangerous facilities, with some proximity to elements considered vulnerable or very vulnerable.
Sometimes, quantitative risk analysis is a legal obligation, as expressly provided, for example, in SEVESO regulations, and serves as a criterion for the granting of the corresponding permits to carry out an activity.
Tandem HSE has an extensive experience in the development of quantitative risk analysis (ACR). Throughout our long history, we have faced very complex situations in high-risk companies.
We have large technical and scientific experienced teams to be able to conduct any kind of quantitative analysis where a serious accident could occur. We have the most qualified technical personnel and the most precise and advanced material resources in our domain.
Scenarios for a Quantitative Risk Analysis (QRA)
When hazardous substances or mixtures are handled, it may happen that, in the event of an accident, the various risks (fire, explosion, toxic cloud) materialize. We then face a critical scenario in which decisions will have to be made quickly based on the severity of the various problems that may arise. With the quantitative risk analysis (QRA), we can determine numerically what the results of each catastrophe are and determine what is the most appropriate response, as well as determine the acceptability of the risk of an activity.
It is necessary to calculate the physical consequences, as well as the frequency of occurrence of the different accidental scenarios evaluated, for the determination of the individual risk and the social risk of the establishment.
Methodology for a Quantitative Risk Analysis (QRA)
In a QRA, it is necessary to identify all possible accidents that could occur inside an installation. Then, we need to do the risk calculation for every one of those possible accidents: severity of the consequences and frequency of occurrence.
All this is represented by iso-risk curves and with FN curves, if applicable. They can also be represented numerically with values of the people affected, parts of the facilities, machines, areas, etc.
Tandem HSE uses specialized powerful programs—EFFECTS and RISKCURVES (GEXCON), to perform simulations and risk curve calculations.
Results of a Quantitative Risk Analysis (QRA)
From a quantitative risk analysis, we will have information to implement risk reduction measures. We can also study what the different attenuation alternatives are and the cost they will have.
We will use the results of the analysis to establish monitoring programs for risk-based equipment and facilities.
On top of that, we will have a result with specific risk figures and we will be able to know if we are within the criteria of acceptance of the risk established by the industrial sector’s regulations.
Tandem HSE has an extensive experience in the development of quantitative risk analysis. Throughout our long history, we have faced very complex situations in high-risk companies.
We have large technical and scientific experienced teams to be able to conduct any kind of quantitative analysis where a serious accident could occur. We have the most qualified technical personnel and the most precise and advanced material resources in our domain.
