Critical issue:

• A rigorous approach to risk contour development and possible preventative measures was necessary during the detailed design phase

Solutions:

• A Quantitative Risk Assessment (QRA) was carried out, in line with the philosophy suggested in accordance with EN1473
• A detailed survey was conducted to select potential accident scenarios related to the LNG terminal and its activities. For each of the scenarios, consequence modelling was performed using PHAST, a DNV developed Software tool
• In most failure cases, the probability of occurrence was generated based on generic data. In some specific cases however, fault tree analysis was applied
• Finally, the risk analysis was concluded by evaluating each individual scenario by means of a frequency-consequence matrix (as proposed by EN1473)
• The global risk picture was also calculated by means of the DNV software package, SAFETI, allowing the presentation of the results as Risk Contours and FN graphs
• Risk mitigation measures were proposed for the most critical scenarios

Value delivered:

• DNV contributed to the project through its expertise and knowledge gained in similar quantitative risk assessments of LNG terminals around the world
• This allowed Tractebel Engineering to adopt a safe, practical design for their LNG terminal